Bug Fixed

Der Multiselect funktioniert auf seitens des Frontends und des Backends. Allerdings haben Termine noch nicht die Spalte moduleID, weswegen entries für zwei modules eines Dozenten innerhalb eines Semesters gleich angezeigt werden.

.idea/anwendungsprojekt.iml

@@ -3,7 +3,6 @@
   <component name="NewModuleRootManager">
     <content url="file://$MODULE_DIR$">
       <excludeFolder url="file://$MODULE_DIR$/.tmp" />
-      <excludeFolder url="file://$MODULE_DIR$/build" />
       <excludeFolder url="file://$MODULE_DIR$/temp" />
       <excludeFolder url="file://$MODULE_DIR$/tmp" />
     </content>

.idea/inspectionProfiles/Project_Default.xml

@@ -0,0 +1,16 @@
+<component name="InspectionProjectProfileManager">
+  <profile version="1.0">
+    <option name="myName" value="Project Default" />
+    <inspection_tool class="CssUnknownProperty" enabled="true" level="WARNING" enabled_by_default="true">
+      <option name="myCustomPropertiesEnabled" value="true" />
+      <option name="myIgnoreVendorSpecificProperties" value="false" />
+      <option name="myCustomPropertiesList">
+        <value>
+          <list size="1">
+            <item index="0" class="java.lang.String" itemvalue="font-color" />
+          </list>
+        </value>
+      </option>
+    </inspection_tool>
+  </profile>
+</component>

.idea/jsLibraryMappings.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="JavaScriptLibraryMappings">
+    <includedPredefinedLibrary name="Node.js Core" />
+  </component>
+</project>

.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/anwendungsprojekt.iml" filepath="$PROJECT_DIR$/.idea/anwendungsprojekt.iml" />
+    </modules>
+  </component>
+</project>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

README.md

@@ -0,0 +1,4 @@
+# TIF22A_AnwProjekt_B
+Team B im Anwendungsprojekt (TIF22A) 
+
+Website can be accessed under: http://lectureplanner.de/ (caution no https, only http)

anwendung/.gitignore

@@ -8,16 +8,28 @@
 # testing
 /coverage
 
+# next.js
+/.next/
+/out/
+
 # production
 /build
 
 # misc
 .DS_Store
-.env.local
+*.pem
-.env.development.local
-.env.test.local
-.env.production.local
 
+# debug
 npm-debug.log*
 yarn-debug.log*
 yarn-error.log*
+
+# local env files
+.env*.local
+
+# vercel
+.vercel
+
+# typescript
+*.tsbuildinfo
+next-env.d.ts

anwendung/.idea/.gitignore

@@ -0,0 +1,5 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/

anwendung/.idea/anwendung.iml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="WEB_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$">
+      <excludeFolder url="file://$MODULE_DIR$/.tmp" />
+      <excludeFolder url="file://$MODULE_DIR$/temp" />
+      <excludeFolder url="file://$MODULE_DIR$/tmp" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

anwendung/.idea/codeStyles/codeStyleConfig.xml

@@ -0,0 +1,5 @@
+<component name="ProjectCodeStyleConfiguration">
+  <state>
+    <option name="PREFERRED_PROJECT_CODE_STYLE" value="Default" />
+  </state>
+</component>

anwendung/.idea/modules.xml

@@ -2,7 +2,7 @@
 <project version="4">
   <component name="ProjectModuleManager">
     <modules>
-      <module fileurl="file://$PROJECT_DIR$/.idea/projekt.iml" filepath="$PROJECT_DIR$/.idea/projekt.iml" />
+      <module fileurl="file://$PROJECT_DIR$/.idea/anwendung.iml" filepath="$PROJECT_DIR$/.idea/anwendung.iml" />
     </modules>
   </component>
 </project>

anwendung/README.md

@@ -0,0 +1,38 @@
+This is a [Next.js](https://nextjs.org/) project bootstrapped with [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app).
+
+## Getting Started
+
+First, run the development server:
+
+```bash
+npm run dev
+# or
+yarn dev
+# or
+pnpm dev
+```
+
+Open [http://localhost:3000](http://localhost:3000) with your browser to see the result.
+
+You can start editing the page by modifying `pages/index.js`. The page auto-updates as you edit the file.
+
+[API routes](https://nextjs.org/docs/api-routes/introduction) can be accessed on [http://localhost:3000/api/hello](http://localhost:3000/api/hello). This endpoint can be edited in `pages/api/hello.js`.
+
+The `pages/api` directory is mapped to `/api/*`. Files in this directory are treated as [API routes](https://nextjs.org/docs/api-routes/introduction) instead of React pages.
+
+This project uses [`next/font`](https://nextjs.org/docs/basic-features/font-optimization) to automatically optimize and load Inter, a custom Google Font.
+
+## Learn More
+
+To learn more about Next.js, take a look at the following resources:
+
+- [Next.js Documentation](https://nextjs.org/docs) - learn about Next.js features and API.
+- [Learn Next.js](https://nextjs.org/learn) - an interactive Next.js tutorial.
+
+You can check out [the Next.js GitHub repository](https://github.com/vercel/next.js/) - your feedback and contributions are welcome!
+
+## Deploy on Vercel
+
+The easiest way to deploy your Next.js app is to use the [Vercel Platform](https://vercel.com/new?utm_medium=default-template&filter=next.js&utm_source=create-next-app&utm_campaign=create-next-app-readme) from the creators of Next.js.
+
+Check out our [Next.js deployment documentation](https://nextjs.org/docs/deployment) for more details.

anwendung/jsconfig.json

@@ -0,0 +1,7 @@
+{
+  "compilerOptions": {
+    "paths": {
+      "@/*": ["./src/*"]
+    }
+  }
+}

anwendung/next.config.js

@@ -0,0 +1,6 @@
+/** @type {import('next').NextConfig} */
+const nextConfig = {
+  reactStrictMode: true,
+}
+
+module.exports = nextConfig

anwendung/package.json

@@ -0,0 +1,19 @@
+{
+  "name": "anwendung",
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "dev": "next dev",
+    "build": "next build",
+    "start": "next start",
+    "lint": "next lint"
+  },
+  "dependencies": {
+    "autoprefixer": "10.4.14",
+    "next": "13.3.4",
+    "postcss": "8.4.23",
+    "react": "18.2.0",
+    "react-dom": "18.2.0",
+    "tailwindcss": "3.3.2"
+  }
+}

anwendung/postcss.config.js

@@ -0,0 +1,6 @@
+module.exports = {
+  plugins: {
+    tailwindcss: {},
+    autoprefixer: {},
+  },
+}

anwendung/public/next.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 394 80"><path fill="#000" d="M262 0h68.5v12.7h-27.2v66.6h-13.6V12.7H262V0ZM149 0v12.7H94v20.4h44.3v12.6H94v21h55v12.6H80.5V0h68.7zm34.3 0h-17.8l63.8 79.4h17.9l-32-39.7 32-39.6h-17.9l-23 28.6-23-28.6zm18.3 56.7-9-11-27.1 33.7h17.8l18.3-22.7z"/><path fill="#000" d="M81 79.3 17 0H0v79.3h13.6V17l50.2 62.3H81Zm252.6-.4c-1 0-1.8-.4-2.5-1s-1.1-1.6-1.1-2.6.3-1.8 1-2.5 1.6-1 2.6-1 1.8.3 2.5 1a3.4 3.4 0 0 1 .6 4.3 3.7 3.7 0 0 1-3 1.8zm23.2-33.5h6v23.3c0 2.1-.4 4-1.3 5.5a9.1 9.1 0 0 1-3.8 3.5c-1.6.8-3.5 1.3-5.7 1.3-2 0-3.7-.4-5.3-1s-2.8-1.8-3.7-3.2c-.9-1.3-1.4-3-1.4-5h6c.1.8.3 1.6.7 2.2s1 1.2 1.6 1.5c.7.4 1.5.5 2.4.5 1 0 1.8-.2 2.4-.6a4 4 0 0 0 1.6-1.8c.3-.8.5-1.8.5-3V45.5zm30.9 9.1a4.4 4.4 0 0 0-2-3.3 7.5 7.5 0 0 0-4.3-1.1c-1.3 0-2.4.2-3.3.5-.9.4-1.6 1-2 1.6a3.5 3.5 0 0 0-.3 4c.3.5.7.9 1.3 1.2l1.8 1 2 .5 3.2.8c1.3.3 2.5.7 3.7 1.2a13 13 0 0 1 3.2 1.8 8.1 8.1 0 0 1 3 6.5c0 2-.5 3.7-1.5 5.1a10 10 0 0 1-4.4 3.5c-1.8.8-4.1 1.2-6.8 1.2-2.6 0-4.9-.4-6.8-1.2-2-.8-3.4-2-4.5-3.5a10 10 0 0 1-1.7-5.6h6a5 5 0 0 0 3.5 4.6c1 .4 2.2.6 3.4.6 1.3 0 2.5-.2 3.5-.6 1-.4 1.8-1 2.4-1.7a4 4 0 0 0 .8-2.4c0-.9-.2-1.6-.7-2.2a11 11 0 0 0-2.1-1.4l-3.2-1-3.8-1c-2.8-.7-5-1.7-6.6-3.2a7.2 7.2 0 0 1-2.4-5.7 8 8 0 0 1 1.7-5 10 10 0 0 1 4.3-3.5c2-.8 4-1.2 6.4-1.2 2.3 0 4.4.4 6.2 1.2 1.8.8 3.2 2 4.3 3.4 1 1.4 1.5 3 1.5 5h-5.8z"/></svg>

anwendung/public/vercel.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 283 64"><path fill="black" d="M141 16c-11 0-19 7-19 18s9 18 20 18c7 0 13-3 16-7l-7-5c-2 3-6 4-9 4-5 0-9-3-10-7h28v-3c0-11-8-18-19-18zm-9 15c1-4 4-7 9-7s8 3 9 7h-18zm117-15c-11 0-19 7-19 18s9 18 20 18c6 0 12-3 16-7l-8-5c-2 3-5 4-8 4-5 0-9-3-11-7h28l1-3c0-11-8-18-19-18zm-10 15c2-4 5-7 10-7s8 3 9 7h-19zm-39 3c0 6 4 10 10 10 4 0 7-2 9-5l8 5c-3 5-9 8-17 8-11 0-19-7-19-18s8-18 19-18c8 0 14 3 17 8l-8 5c-2-3-5-5-9-5-6 0-10 4-10 10zm83-29v46h-9V5h9zM37 0l37 64H0L37 0zm92 5-27 48L74 5h10l18 30 17-30h10zm59 12v10l-3-1c-6 0-10 4-10 10v15h-9V17h9v9c0-5 6-9 13-9z"/></svg>

anwendung/src/components/Back.jsx

@@ -0,0 +1,21 @@
+import Button from "@/components/Button";
+import {useRouter} from "next/router";
+import {baseURL} from "@/components/Constants";
+import {arrowLeft} from "@/components/Icons";
+
+
+export default function Back(p)
+{
+    return(
+        <div style={{
+            position : "absolute",
+            left : 20,
+            top : 20,
+            width : 60,
+            height : 60
+
+        }}>
+        <Button onClick={() => p.onClick()} icon={arrowLeft} color={"#77932b"} width={75} height={40}/>
+        </div>
+    )
+}

anwendung/src/components/Background.jsx

@@ -0,0 +1,33 @@
+import React from "react";
+
+export default function Background()
+{
+    return (
+        <div style={{
+            position: "absolute",
+            width: "100%",
+            height: "100%",
+            overflow: "clip",
+            pointerEvents: "none"
+        }}>
+            <div style={{
+                position: "absolute",
+                transform: "skew(20deg)",
+                width: "100%",
+                height: "100%",
+                zIndex: -10,
+                backgroundColor: "#f2f2f2",
+                borderTopLeftRadius: 400,
+                borderBottomRightRadius: 800,
+
+            }}></div>
+            <div style={{
+                position: "absolute",
+                width: "100%",
+                height: "100%",
+                zIndex: -11,
+                backgroundColor: "#346991",
+            }}></div>
+        </div>
+    );
+}

anwendung/src/components/Button.jsx

@@ -0,0 +1,65 @@
+/**
+ * Function Takes in Paramter for:
+ * text: text to be shown on the button
+ * width, height: width and height of the button
+ * icon: an icon that should be shown on the button (HTML <svg> tag) (see Icons.js for example)
+ * iconWidth, iconHeight: width and height of the icon
+ * onClick: a function that should be run if the button is clicked
+ * Example for onClick:
+ * <Button onClick={onClick={() => {console.log("do something")}}
+ * Example for icon:
+ */
+export default function Button(p) {
+
+    //default parameters for the button
+    let text = p.text;
+    let width = p.width, height = p.height;
+    let iconHTML = p.icon;
+    let iconWidth = p.iconWidth, iconHeight = p.iconHeight;
+    let onClick = p.onClick;
+    let color = p.color;
+    let fontColor = p.fontColor;
+    let font_size = p.fontSize;
+
+    //if parameters are not set, they are set to default values
+    if (height == null) height = 0;
+    if (width == null) width = 0;
+    if (iconWidth == null) iconWidth = width-10;
+    if (iconHeight == null) iconHeight = height-10;
+    if (onClick == null) onClick = () => {};
+    if (color == null) color = "#363636";
+    if (fontColor == null) fontColor = "white";
+    if (font_size == null) font_size = 16;
+
+    //build in the icon width and height to the svg tag (svg tag should not contain any size information by default)
+    if (iconHTML != null) {
+        let split = iconHTML.split("fill=");
+        split[1] = "fill=" + split[1];
+        split[0] += " width=" + iconWidth + " height=" + iconHeight + " ";
+        iconHTML = split[0] + split[1]
+    } else {
+        iconHTML = "";
+    }
+
+    //return the button
+    return (
+        <>
+            <button className={"round-border button font font-small"}
+                    style={{
+                        display: "flex",
+                        alignItems: "center",
+                        justifyContent: "center",
+                        backgroundColor: color,
+                        color: fontColor,
+                        fontSize: font_size,
+                        minWidth: width,
+                        minHeight: height,
+                        textAlign: "center",
+                    }}
+                    onClick={onClick}>
+                {text}
+                <div dangerouslySetInnerHTML={{__html: iconHTML}}/>
+            </button>
+        </>
+    );
+}

anwendung/src/components/CalendarSideBar.jsx

@@ -0,0 +1,184 @@
+import {useEffect, useRef} from "react";
+
+let startParts = []
+let endParts = []
+const months = [["Januar", 31], ["Februar", 28], ["März", 31], ["April", 30], ["Mai", 31], ["Juni", 30], ["Juli", 31], ["August", 31], ["September", 30], ["Oktober", 31], ["November", 30], ["Dezember", 31]]
+const days = months.map((month => month[1]))
+let result = []
+let startDate
+let calculatedDay = []
+const weekdays = ["Mo", "Di", "Mi", "Do", "Fr", "Sa", "So"]
+let lastMonth = 0
+
+export default function BasicDateCalendar(p) {
+
+    const ref = useRef(null)
+
+    function getBackMonthColor(monthIndex)
+    {
+        let date = new Date(parseInt(startParts[2]), parseInt(startParts[1])  + monthIndex - 1, 1)
+        if (date.getFullYear() === p.highlightYear && date.getMonth() === p.highlightMonth)
+        {
+            if(lastMonth !== p.highlightMonth)
+            {
+                ref.current.scrollTo({top: 290 * monthIndex - 270, behavior: "smooth"})
+            }
+            lastMonth = p.highlightMonth
+            return true
+        }else
+            return false
+    }
+
+    useEffect(() => {
+        startParts = []
+        endParts = []
+        result = []
+        calculatedDay = []
+
+        startDate = new Date(p.startyear,  0 ,p.startday)
+        let endDate = new Date(p.endyear, 0 , p.endday)
+        let startString = startDate.getDate() + "." + (startDate.getMonth() + 1) +  "." + p.startyear
+        let endString = endDate.getDate() + "." + (endDate.getMonth() + 1) +  "." + p.endyear
+        generateCalendar(startString, endString)
+    })
+
+    return (
+        <div className={"Allround"} ref={ref}>
+            <div className={"Down"}>
+                {result.map((monthResult, index) => (
+                    <div className={"A box-shadow"} onClick={() => p.onMonthClick(
+                        (parseInt(startParts[1]) + index),
+                        startParts
+                    )} >
+                        <p style={{
+                            textAlign : "center",
+                            marginBottom : 10,
+                            fontSize: 19,
+                            pointerEvents: "none",
+                            backgroundColor: getBackMonthColor(index) ? "#346991":"rgba(0,0,0,0)",
+                            color : getBackMonthColor(index) ? "white":"black",
+                            borderRadius : 10
+                        }}>{getMonthName(index) + " " + new Date(parseInt(startParts[2]), parseInt(startParts[1])  + index - 1, 1).getFullYear()}</p>
+                        <div className={"Days"} style={{
+                            pointerEvents: "none"
+                        }}>
+                            {weekdays.map((weekday) => (
+                                <p key={weekday} style={{
+                                    pointerEvents: "none"
+                                }}>{weekday}</p>
+                            ))}
+                            {freeSpaces(index)}
+                            {monthResult.map((date) => (
+                                <p key={date} style={{
+                                    pointerEvents: "none"
+                                }}>{date}</p>
+                            ))}
+                        </div>
+                    </div>
+                ))}
+            </div>
+        </div>
+    )
+}
+
+
+
+function getMonthName(monthIndex) {
+    if (startParts[1] - 1 + monthIndex < 12) {
+        return months[startParts[1] - 1 + monthIndex][0];
+    } else {
+        return months[startParts[1] - 1 + monthIndex - 12][0];
+    }
+}
+
+function generateCalendar(start, ende)
+{
+    splitter(start, ende)
+    if (startParts[2] < endParts[2])
+    {
+        for (let i = startParts[1] - 1; i <= 11; i++)
+        {
+            let monthResult = [];
+            for (let j = 1; j <= days[i]; j++)
+            {
+                if (
+                    new Date(startParts[2], i, j) >= new Date(startParts[2], startParts[1] - 1, startParts[0]) &&
+                    new Date(startParts[2], i, j) <= new Date(startParts[2], 11, 31)
+                )
+                {
+                    monthResult.push(j);
+                    calculateDay(startParts[2], i, j)
+                }
+            }
+            result.push(monthResult);
+            if (i == 11)
+            {
+                for (let h = 0; h <= endParts[1] - 1; h++)
+                {
+                    let monthResultNewYear = [];
+                    for (let g = 1; g <= days[h]; g++)
+                    {
+                        if (new Date(endParts[2], h, g) <= new Date(endParts[2], endParts[1] - 1, endParts[0]))
+                        {
+                            monthResultNewYear.push(g);
+                            calculateDay(endParts[2], h, g)
+                        }
+                    }
+                    result.push(monthResultNewYear);
+                }
+            }
+        }
+    } else
+    {
+        for (let i = startParts[1] - 1; i <= endParts[1] - 1; i++)
+        {
+            let monthResult = [];
+            for (let j = 1; j <= days[i]; j++)
+            {
+                if (
+                    new Date(startParts[2], i, j) >= new Date(startParts[2], startParts[1] - 1, startParts[0]) &&
+                    new Date(startParts[2], i, j) <= new Date(startParts[2], endParts[1] - 1, endParts[0])
+                )
+                {
+                    monthResult.push(j)
+                    calculateDay(startParts[2], i, j)
+                }
+            }
+            result.push(monthResult);
+        }
+    }
+}
+
+function calculateDay(x, i, j){
+    if (j == startDate.getDate() && i == startDate.getMonth() || j == 1){
+        let monthStart = new Date(x, i, j)
+        if (monthStart.getDay() == 0)
+            calculatedDay.push(6)
+        else calculatedDay.push(monthStart.getDay() - 1)
+    }
+}
+
+function freeSpaces(index)
+{
+    let arrayTest = []
+    for (let i = 0; i < calculatedDay[index]; i++) {
+        arrayTest.push(<p style={{
+            pointerEvents: "none"
+        }}></p>)
+    }
+    return arrayTest
+}
+
+function splitter(startDate, endDate)
+{
+    startParts = startDate.split(".")
+    if (startParts[1][0] === 0) //prüft ob die erste Stelle des Monats eine 0 vorne stehen hat
+    {
+        startParts[1] = startParts[1][1] //überschreibt den Monat ohne die 0
+    }
+    endParts = endDate.split(".") //prüft ob die erste Stelle des Monats eine 0 vorne stehen hat
+    if (endParts[1][0] === 0)
+    {
+        endParts[1] = endParts[1][1] //überschreibt den Monat ohne die 0
+    }
+}

anwendung/src/components/CalenderView.jsx

@@ -0,0 +1,815 @@
+import {useEffect, useRef, useState} from "react";
+import Button from "@/components/Button";
+import {list} from "postcss";
+import Background from "@/components/Background";
+import WeekSelector from "@/components/WeekSelector";
+import {baseURL} from "@/components/Constants";
+import {ErrorType} from "@/components/ErrorType";
+import BasicDateCalendar from "@/components/CalendarSideBar";
+import feiertagejs from "feiertagejs";
+
+let cellHeight = 20;
+
+let colors = ["#f80000", "#414141"]
+
+let semesterStart;
+let semesterEnd;
+let currentWeekStartDay;
+let currentYear;
+let semesterStartYear;
+let semesterEndYear;
+let selectedElement;
+let grabbedDown;
+
+let isDayOkay = [true, true, true, true, true, true]
+
+let errorState = [ErrorType.Okay, ErrorType.Okay, ErrorType.Okay, ErrorType.Okay, ErrorType.Okay, ErrorType.Okay]
+let grayedOut = [false, false, false, false, false, false]
+
+export default function CalenderView(p) {
+
+    const [entries, setEntries] = useState([[], [], [], [], [], []])
+    const [update, setUpdate] = useState(false)
+    const scrollRef = useRef(null);
+
+    const [startDayCalenderSideBar, setStartDayCalenderSideBar] = useState(0)
+    const [startYearCalenderSideBar, setStartYearCalenderSideBar] = useState(2000)
+    const [endDayCalenderSideBar, setEndDayCalenderSideBar] = useState(0)
+    const [endYearCalenderSideBar, setEndYearCalenderSideBar] = useState(2000)
+    const [highlightMonth, setHighlightMonth] = useState(0)
+    const [highlightYear, setHighlightYear] = useState(2000)
+
+
+    function readEntries() {
+        let url = baseURL + "/entries?semesterid=" + localStorage.getItem("currentsid") +
+            "&daynumber=" + currentWeekStartDay + "&yearnumber=" + currentYear + "&sessionid=" + localStorage.getItem("sessionid");
+        let currentsid = localStorage.getItem("currentsid")
+        let userid = localStorage.getItem("userid")
+
+        try {
+            fetch(url).then(r => r.json()).then(en => {
+
+
+                for (let i = 0; i < en.length; i++) {
+                    isDayOkay[i] = true
+                    let maxLunchBreak = 0
+                    let daySum = 0
+                    for (let j = 0; j < en[i].length; j++) {
+                        if (en[i][j] != null && currentsid == (en[i][j]).semesterid) {
+                            let elem = en[i][j]
+
+                            if ((elem.timestart - 1) / 4 < 8) {
+                                errorState[i] = ErrorType.TooEarly
+                                isDayOkay[i] = false
+                                break
+                            } else if ((elem.timeend - 1) / 4 > 17) {
+                                errorState[i] = ErrorType.TooLate
+                                isDayOkay[i] = false
+                                break
+                            }
+                            else if(new Date(currentYear, 0, elem.daynumber).getUTCDay() === 5) {
+                                errorState[i] = ErrorType.Saturday
+                                isDayOkay[i] = false
+                            }
+                            else {
+                                if ((elem.timestart - 1) / 4 <= 11 && (elem.timeend - 1) / 4 >= 14) {
+                                    errorState[i] = ErrorType.NotEnoughLunchTime
+                                    isDayOkay[i] = false
+                                    break
+                                } else if ((elem.timeend - 1) / 4 >= 11 && (elem.timeend - 1) / 4 <= 14) {
+                                    let min = 24 * 3
+
+                                    for (let j2 = 0; j2 < en[i].length; j2++) {
+                                        if (en[i][j2] != null && (en[i][j2].timestart - 1) / 4 >= 11 && (en[i][j2].timestart - 1) / 4 <= 14 && currentsid == (en[i][j2]).semesterid) {
+                                            if (en[i][j2].timestart < min && en[i][j2].timestart >= elem.timeend) {
+                                                min = en[i][j2].timestart
+                                            }
+                                        }
+                                    }
+
+                                    if (min - elem.timeend < 3) {
+                                        errorState[i] = ErrorType.NotEnoughLunchTime
+                                        isDayOkay[i] = false
+                                        break
+                                    }
+                                }
+
+                                errorState[i] = ErrorType.Okay
+                            }
+
+                            daySum += elem.timeend - elem.timestart
+                        }
+                    }
+
+                    if (daySum / 4 > 8) {
+                        errorState[i] = ErrorType.TooLong
+                        isDayOkay[i] = false
+                    }
+                }
+
+                for (let i = 0; i < 6; i++) {
+                    for (let k = 0; k < 20; k++) {
+                        if (en[i][k] != null){
+
+                            if (en[i][k].semesterid != currentsid)
+                            {
+                                for (let l = 0; l < 20; l++) {
+                                    if (en[i][l] != null && en[i][l].usercreatedbyid != userid) {
+                                        if (en[i][l].timestart <= en[i][k].timestart && en[i][l].timeend >= en[i][k].timeend) {
+                                            en[i][k] = null;
+                                            break
+                                        }
+                                        if (en[i][k].timestart <= en[i][l].timeend && en[i][k].timestart >= en[i][l].timestart) {
+                                            en[i][k].timestart = en[i][l].timeend
+                                        }
+                                        if (en[i][k].timeend >= en[i][l].timestart && en[i][k].timeend <= en[i][l].timeend) {
+                                            en[i][k].timeend = en[i][l].timestart
+                                        }
+                                    }
+                                }
+                            }
+                            if (en[i][k] != null && en[i][k].usercreatedbyid != userid) {
+                                for (let l = 0; l < 20; l++) {
+                                    if (en[i][l] != null && en[i][l].semesterid != currentsid) {
+                                        if (en[i][l].timestart <= en[i][k].timestart && en[i][l].timeend >= en[i][k].timeend) {
+                                            en[i][k] = null;
+                                            break
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+
+                }
+
+                let j = 0;
+                for(let i = Math.round(((new Date(currentYear, 0, currentWeekStartDay) - new Date(currentYear, 0, 0)) / (1000 * 60 * 60 * 24))); i <= Math.round(((new Date(currentYear, 0, currentWeekStartDay + 5) - new Date(currentYear, 0, 0)) / (1000 * 60 * 60 * 24))); i++)
+                {
+                    grayedOut[j] = i % Math.round(((new Date(currentYear, 11, 31) - new Date(currentYear, 0, 0)) / (1000 * 60 * 60 * 24)))  < semesterStart && semesterEnd && new Date(currentYear, 0, currentWeekStartDay + j).getFullYear() == semesterStartYear || i % Math.round(((new Date(currentYear, 11, 31) - new Date(currentYear, 0, 0)) / (1000 * 60 * 60 * 24))) > semesterEnd && new Date(currentYear, 0, currentWeekStartDay + j).getFullYear() == semesterEndYear
+                    j++
+                }
+                for (let i = 0; i < 6; i++) {
+                    let date = new Date(currentYear, 0, currentWeekStartDay+i)
+                    grayedOut[i] = holiday(currentYear, date.getMonth(), date.getDate()) ? holiday(currentYear, date.getMonth(), date.getDate()) : grayedOut[i]
+                }
+
+                setEntries(en)
+            })
+        } catch (e) {
+
+        }
+    }
+
+    function pushEntry(currentColumnID, row) {
+        let url = baseURL + "/entries" + "?sessionid=" + localStorage.getItem("sessionid")
+        let json = {
+            "id": 0,
+            "daynumber": currentWeekStartDay + currentColumnID,
+            "yearnumber": currentYear,
+            "semesterid": localStorage.getItem("currentsid"),
+            "usercreatedbyid": localStorage.getItem("userid"),
+            "timestart": row,
+            "timeend": row + 3,
+            "info": localStorage.getItem("currentmodulename")
+        }
+        fetch(url, {
+            method: "POST",
+            headers: {"Content-Type": "application/json"},
+            body: JSON.stringify(json)
+        }).then(r => {
+            readEntries()
+        })
+    }
+
+    function deleteEntry(id) {
+        let url = baseURL + "/entries?id=" + id + "&sessionid=" + localStorage.getItem("sessionid");
+        fetch(url, {
+            method: "DELETE"
+        }).then(r => readEntries())
+    }
+
+    function holiday(year, month, day){
+        var feiertagejs = require('feiertagejs');
+        let today = new Date(year, month, day)
+        return feiertagejs.isHoliday(today, 'BW')
+    }
+
+    function checkForElementAtRow(row, column) {
+        let currentList = entries[column];
+        for (let i = 0; i < currentList.length; i++) {
+            if (currentList[i] != null) {
+                if (row >= currentList[i].timestart && row <= currentList[i].timeend) {
+
+
+                    return true;
+
+                }
+            }
+        }
+
+        return false;
+    }
+
+    function getElementInColumn(id, column) {
+        let currentList = entries[column];
+        for (let i = 0; i < currentList.length; i++) {
+            if (currentList[i] != null) {
+                if (currentList[i].id === id) {
+                    return currentList[i];
+                }
+            }
+        }
+
+        return null;
+    }
+
+    function onMouseUp(e) {
+        if (selectedElement != null) {
+            let id = selectedElement.id;
+
+            if ((selectedElement.timestart - 1) / 4 >= 7 && (selectedElement.timeend - 1) / 4 <= 18) {
+                let url = baseURL + "/entries?sessionid=" + localStorage.getItem("sessionid");
+                let json = {
+                    "id": id,
+                    "daynumber": 0,
+                    "yearnumber": 0,
+                    "semesterid": 0,
+                    "usercreatedbyid": 0,
+                    "timestart": selectedElement.timestart,
+                    "timeend": selectedElement.timeend,
+                    "info": ""
+                }
+                fetch(url, {
+                    method: "PUT",
+                    headers: {"Content-Type": "application/json"},
+                    body: JSON.stringify(json)
+                }).then(r => {
+                    readEntries()
+                })
+            }
+
+            selectedElement = null;
+        }
+    }
+
+    function onMouseMove(e) {
+        if (selectedElement != null) {
+            let y_window = e.clientY;
+            let y_target_offset = e.currentTarget.getBoundingClientRect().top;
+            let row = Math.floor((y_window - y_target_offset) / cellHeight) + 1;
+            let currentColumnID = parseInt(e.currentTarget.id)
+
+            if (grabbedDown) {
+                if (row - 1 > selectedElement.timestart) {
+
+                    let free = true;
+                    for (let i = 0; i < entries[currentColumnID].length; i++) {
+                        if (entries[currentColumnID][i] != null && selectedElement !== entries[currentColumnID][i]) {
+                            if (row <= entries[currentColumnID][i].timeend &&
+                                row >= entries[currentColumnID][i].timestart ||
+                                row > entries[currentColumnID][i].timeend &&
+                                selectedElement.timestart < entries[currentColumnID][i].timestart) {
+                                free = false;
+                                break;
+                            }
+                        }
+                    }
+
+                    if (free) {
+                        selectedElement.timeend = row + 1;
+                    }
+                }
+            } else if (row + 2 < selectedElement.timeend) {
+                let free = true;
+                for (let i = 0; i < entries[currentColumnID].length; i++) {
+                    if (entries[currentColumnID][i] != null && selectedElement !== entries[currentColumnID][i]) {
+                        if (row < entries[currentColumnID][i].timeend &&
+                            row >= entries[currentColumnID][i].timestart ||
+                            row < entries[currentColumnID][i].timestart &&
+                            selectedElement.timeend > entries[currentColumnID][i].timestart) {
+                            free = false;
+                            break;
+                        }
+                    }
+                }
+
+                if (free) {
+                    selectedElement.timestart = row;
+                }
+            }
+            setUpdate(!update);
+        }
+    }
+
+    function onMouseDown(e) {
+        let y_window = e.clientY;
+        let y_target_offset = e.currentTarget.getBoundingClientRect().top;
+        let row = Math.floor((y_window - y_target_offset) / cellHeight) + 1;
+        let currentColumnID = parseInt(e.currentTarget.id)
+        let currentId = e.target.id;
+        let currentUserID = localStorage.getItem("userid");
+        let currentsid = localStorage.getItem("currentsid")
+
+        if (e.button === 0) {
+            if (!currentId.includes("e")) {
+                if (!currentId.includes("grab")) {
+                    if (!checkForElementAtRow(row + 2, currentColumnID) && !checkForElementAtRow(row+1, currentColumnID)) {
+                        if ((row - 1) / 4 >= 7 && (row + 2) / 4 <= 18) {
+                            if(!grayedOut[currentColumnID]) {
+                                pushEntry(currentColumnID, row)
+                            }
+                        }
+                    }
+                } else {
+                    let parentID = parseInt(e.target.parentElement.id.replace("e", ""));
+                    if (currentUserID == getElementInColumn(parentID, currentColumnID).usercreatedbyid && getElementInColumn(parentID, currentColumnID).semesterid == currentsid) {
+                        grabbedDown = currentId.includes("down")
+                        selectedElement = getElementInColumn(parentID, currentColumnID);
+                    }
+                }
+            }
+        } else if (e.button === 2) {
+            let parentID = parseInt(e.target.id.replace("e", ""));
+            if (currentUserID == getElementInColumn(parentID, currentColumnID).usercreatedbyid && currentId.includes("e") && getElementInColumn(parentID, currentColumnID).semesterid == currentsid) {
+                let id = parseInt(currentId.replace("e", ""))
+                errorState[currentColumnID] = ErrorType.Okay
+                deleteEntry(id)
+            }
+        }
+    }
+
+    function onWeekLeft() {
+        currentWeekStartDay -= 7;
+        let date = new Date(currentYear, 0, currentWeekStartDay + 5)
+        setHighlightMonth(date.getMonth())
+        setHighlightYear(date.getFullYear())
+
+        for(let i = 0; i < errorState.length; i++)
+        {
+            errorState[i] = ErrorType.Okay
+        }
+
+        readEntries()
+    }
+
+    function onWeekRight() {
+        currentWeekStartDay += 7;
+        let date = new Date(currentYear, 0, currentWeekStartDay + 5)
+        setHighlightMonth(date.getMonth())
+        setHighlightYear(date.getFullYear())
+
+        for(let i = 0; i < errorState.length; i++)
+        {
+            errorState[i] = ErrorType.Okay
+        }
+
+        readEntries()
+    }
+
+    function getEntryColor(userCreatedByID, columnID, semesterid) {
+        let id = localStorage.getItem("userid");
+        let currentsid = localStorage.getItem("currentsid")
+        if (id == userCreatedByID) {
+            if (isDayOkay[columnID] && semesterid == currentsid) {
+                return "#77932b";
+            }else if(semesterid != currentsid){
+                return "#346991";
+            }else {
+                return "#e5a10e";
+            }
+
+        } else {
+            return "#a2a2a2";
+        }
+    }
+
+    function getResizeBarColor(userCreatedByID, columnID, semesterid) {
+        let id = localStorage.getItem("userid");
+        let currentsid = localStorage.getItem("currentsid")
+        if (id == userCreatedByID) {
+            if (isDayOkay[columnID] && currentsid == semesterid) {
+                return "#5a6c20";
+            } else if(currentsid != semesterid)
+            {
+                return "#346991"
+            }
+            else {
+                return "#c08809";
+            }
+        } else {
+            return "#a2a2a2";
+        }
+    }
+
+    useEffect(() => {
+        semesterStart = 0;
+        semesterEnd = 0;
+        semesterStartYear = 0;
+        semesterEndYear = 0;
+        currentWeekStartDay = 0;
+        currentYear = 2000;
+        selectedElement = null;
+        grabbedDown = false;
+        errorState = [ErrorType.Okay, ErrorType.Okay, ErrorType.Okay, ErrorType.Okay, ErrorType.Okay, ErrorType.Okay]
+
+        let url = baseURL + "/semester/id?sessionid=" + localStorage.getItem("sessionid") +
+            "&id=" + localStorage.getItem("currentsid");
+
+
+        fetch(url).then(r => r.json()).then(s => {
+            currentWeekStartDay = s.startday - new Date(s.startyear, 0, s.startday).getUTCDay();
+            currentYear = s.startyear;
+            setStartYearCalenderSideBar(currentYear)
+            setEndYearCalenderSideBar(s.endyear)
+            setHighlightMonth(new Date(s.startyear, 0, s.startday).getMonth())
+            setHighlightYear(currentYear)
+
+            semesterStart = s.startday;
+            semesterEnd = s.endday;
+            semesterStartYear = s.startyear;
+            semesterEndYear = s.endyear;
+            setStartDayCalenderSideBar(semesterStart)
+            setEndDayCalenderSideBar(s.endday)
+        }).then(readEntries)
+
+        scrollRef.current.scrollTop = 600;
+        window.addEventListener("contextmenu", (e) => (e.preventDefault()))
+
+        window.addEventListener("keypress", (e) => {
+            try {
+                if (e.key === "+") {
+                    cellHeight += 2
+                } else if (e.key === "-") {
+                    if (cellHeight - 2 >= 8) {
+                        cellHeight -= 2
+                    }
+                }
+            } catch (e) {
+
+            }
+        })
+
+
+        setInterval(function () {
+            if (selectedElement == null) {
+                readEntries()
+            }
+        }, 500);
+    }, [])
+
+
+    //returns internal format (0 - 96) to a string
+    function internal_to_time(internal) {
+        internal -= 1
+        internal /= 4
+        let integer = Math.floor(internal)
+        let decimal = internal.toFixed(2);
+        let minutes = Math.floor((decimal - integer) * 60);
+        let minutes_string = minutes.toString().length === 1 ? "0" + minutes : minutes
+        return integer + ":" + minutes_string;
+    }
+
+    let temp = []
+    for (let i = 2; i <= 96; i += 2) {
+        temp.push(i);
+    }
+
+    function onMonthClick(monthIndex, startParts) {
+        monthIndex--
+        let date = new Date(parseInt(startParts[2]), monthIndex, 1)
+        let start = new Date(date.getFullYear(), 0, 0)
+        currentWeekStartDay = Math.round((date - start) / (1000 * 60 * 60 * 24))
+        currentWeekStartDay = currentWeekStartDay - new Date(date.getFullYear(), 0, currentWeekStartDay).getUTCDay()
+        currentYear = date.getFullYear()
+        setHighlightMonth(date.getMonth())
+        setHighlightYear(currentYear)
+
+        for(let i = 0; i < errorState.length; i++)
+        {
+            errorState[i] = ErrorType.Okay
+        }
+
+        readEntries()
+    }
+
+    return (
+
+        <div className={"calender-direction-wrapper"}>
+            <div>
+                <BasicDateCalendar startyear={startYearCalenderSideBar} startday={startDayCalenderSideBar}
+                                   endyear={endYearCalenderSideBar} endday={endDayCalenderSideBar}
+                                   highlightYear={highlightYear} highlightMonth={highlightMonth}
+                                   onMonthClick={onMonthClick}/>
+            </div>
+            <div style={{
+                display: "flex",
+                height: "73vh",
+                flexDirection: "column",
+                justifyContent: "center",
+                alignItems: "center",
+            }} id={update}>
+                <WeekSelector year={currentYear} startday={currentWeekStartDay} onFunctionLeft={() => onWeekLeft()}
+                              onFunctionRight={() => onWeekRight()}/>
+                <div style={{
+                    display: "flex",
+                    flexDirection: "row",
+                    justifyContent: "center",
+                    alignItems: "center",
+                    backgroundColor: "white",
+                    gap: 5,
+                }}>
+                    <div style={{borderRadius: 10, padding: 10, backgroundColor: "#f1f1f1"}} className={"box-shadow"}>
+                        <div>
+                            <div className={"wochen-tag-container"}>
+                                <div
+                                    className={"wochen-tag font-big"}>Montag {new Date(currentYear, 0, currentWeekStartDay).getDate()}.
+                                </div>
+                                <div
+                                    className={"wochen-tag font-big"}>Dienstag {new Date(currentYear, 0, currentWeekStartDay + 1).getDate()}.
+                                </div>
+                                <div
+                                    className={"wochen-tag font-big"}>Mittwoch {new Date(currentYear, 0, currentWeekStartDay + 2).getDate()}.
+                                </div>
+                                <div
+                                    className={"wochen-tag font-big"}>Donnerstag {new Date(currentYear, 0, currentWeekStartDay + 3).getDate()}.
+                                </div>
+                                <div
+                                    className={"wochen-tag font-big"}>Freitag {new Date(currentYear, 0, currentWeekStartDay + 4).getDate()}.
+                                </div>
+                                <div
+                                    className={"wochen-tag font-big"}>Samstag {new Date(currentYear, 0, currentWeekStartDay + 5).getDate()}.
+                                </div>
+                            </div>
+                        </div>
+                        <div className={"calender-container"} ref={scrollRef}>
+
+                            <div className={"calender-view content"} style={{height: cellHeight * 96 + 10}}>
+
+
+                                <div className={"spalte"}
+                                     id={"0"} style={{gridTemplateRows: `repeat(96, ${cellHeight}px)`, backgroundColor: grayedOut[0] ? "#aaaaaa" : "#ffffff"}}
+                                     onMouseDown={e => onMouseDown(e)}
+                                     onMouseMove={e => onMouseMove(e)}
+                                     onMouseUp={e => onMouseUp(e)}>
+
+                                    {entries[0].map(d => (d != null && <div className={"entry"} style={{
+                                        width: "100%",
+                                        gridRowStart: d.timestart,
+                                        gridRowEnd: d.timeend,
+                                        backgroundColor: getEntryColor(d.usercreatedbyid, 0, d.semesterid)
+                                    }} id={d.id + "e"}>
+                                        <div className={"resize-grab"} id={"grabup"} style={{
+                                            backgroundColor: getResizeBarColor(d.usercreatedbyid, 0, d.semesterid)
+                                        }}></div>
+                                        <div style={{maxHeight: "60%"}} className={"no-pointer-events"}>
+                                            <p>{internal_to_time(d.timestart) + " - " + internal_to_time(d.timeend)}</p>
+                                            <p>{d.info}</p>
+                                        </div>
+                                        <div className={"resize-grab"} id={"grabdown"} style={{
+                                            backgroundColor: getResizeBarColor(d.usercreatedbyid, 0, d.semesterid)
+                                        }}></div>
+                                    </div>))}
+                                </div>
+
+
+                                <div className={"spalte"}
+                                     id={"1"} style={{gridTemplateRows: `repeat(96, ${cellHeight}px)`, backgroundColor: grayedOut[1] ? "#aaaaaa" : "#ffffff"}}
+                                     onMouseDown={e => onMouseDown(e)}
+                                     onMouseMove={e => onMouseMove(e)}
+                                     onMouseUp={e => onMouseUp(e)}>
+
+                                    {entries[1].map(d => (d != null && <div className={"entry"} style={{
+                                        width: "100%",
+                                        gridRowStart: d.timestart,
+                                        gridRowEnd: d.timeend,
+                                        backgroundColor: getEntryColor(d.usercreatedbyid, 1, d.semesterid)
+                                    }} id={d.id + "e"}>
+
+                                        <div className={"resize-grab"} id={"grabup"} style={{
+                                            backgroundColor: getResizeBarColor(d.usercreatedbyid, 1, d.semesterid)
+                                        }}></div>
+                                        <div style={{maxHeight: "60%"}} className={"no-pointer-events"}>
+                                            <p>{internal_to_time(d.timestart) + " - " + internal_to_time(d.timeend)}</p>
+                                            <p>{d.info}</p>
+                                        </div>
+                                        <div className={"resize-grab"} id={"grabdown"} style={{
+                                            backgroundColor: getResizeBarColor(d.usercreatedbyid, 1, d.semesterid)
+                                        }}></div>
+                                    </div>))}
+                                </div>
+
+
+                                <div className={"spalte"}
+                                     id={"2"} style={{gridTemplateRows: `repeat(96, ${cellHeight}px)`, backgroundColor: grayedOut[2] ? "#aaaaaa" : "#ffffff"}}
+                                     onMouseDown={e => onMouseDown(e)}
+                                     onMouseMove={e => onMouseMove(e)}
+                                     onMouseUp={e => onMouseUp(e)}>
+
+
+                                    {entries[2].map(d => (d != null && <div className={"entry"} style={{
+                                        width: "100%",
+                                        gridRowStart: d.timestart,
+                                        gridRowEnd: d.timeend,
+                                        backgroundColor: getEntryColor(d.usercreatedbyid, 2, d.semesterid)
+                                    }} id={d.id + "e"}>
+
+                                        <div className={"resize-grab"} id={"grabup"} style={{
+                                            backgroundColor: getResizeBarColor(d.usercreatedbyid, 2, d.semesterid)
+                                        }}></div>
+                                        <div style={{maxHeight: "60%"}} className={"no-pointer-events"}>
+                                            <p>{internal_to_time(d.timestart) + " - " + internal_to_time(d.timeend)}</p>
+                                            <p>{d.info}</p>
+                                        </div>
+                                        <div className={"resize-grab"} id={"grabdown"} style={{
+                                            backgroundColor: getResizeBarColor(d.usercreatedbyid, 2, d.semesterid)
+                                        }}></div>
+                                    </div>))}
+                                </div>
+
+
+                                <div className={"spalte"}
+                                     id={"3"} style={{gridTemplateRows: `repeat(96, ${cellHeight}px)`, backgroundColor: grayedOut[3] ? "#aaaaaa" : "#ffffff"}}
+                                     onMouseDown={e => onMouseDown(e)}
+                                     onMouseMove={e => onMouseMove(e)}
+                                     onMouseUp={e => onMouseUp(e)}>
+
+                                    {entries[3].map(d => (d != null && <div className={"entry"} style={{
+                                        width: "100%",
+                                        gridRowStart: d.timestart,
+                                        gridRowEnd: d.timeend,
+                                        backgroundColor: getEntryColor(d.usercreatedbyid, 3, d.semesterid)
+                                    }} id={d.id + "e"}>
+
+                                        <div className={"resize-grab"} id={"grabup"} style={{
+                                            backgroundColor: getResizeBarColor(d.usercreatedbyid, 3, d.semesterid)
+                                        }}></div>
+                                        <div style={{maxHeight: "60%"}} className={"no-pointer-events"}>
+                                            <p>{internal_to_time(d.timestart) + " - " + internal_to_time(d.timeend)}</p>
+                                            <p>{d.info}</p>
+                                        </div>
+                                        <div className={"resize-grab"} id={"grabdown"} style={{
+                                            backgroundColor: getResizeBarColor(d.usercreatedbyid, 3, d.semesterid)
+                                        }}></div>
+                                    </div>))}
+                                </div>
+
+
+                                <div className={"spalte"}
+                                     id={"4"} style={{gridTemplateRows: `repeat(96, ${cellHeight}px)`, backgroundColor: grayedOut[4] ? "#aaaaaa" : "#ffffff"}}
+                                     onMouseDown={e => onMouseDown(e)}
+                                     onMouseMove={e => onMouseMove(e)}
+                                     onMouseUp={e => onMouseUp(e)}>
+
+
+                                    {entries[4].map(d => (d != null && <div className={"entry"} style={{
+                                        width: "100%",
+                                        gridRowStart: d.timestart,
+                                        gridRowEnd: d.timeend,
+                                        backgroundColor: getEntryColor(d.usercreatedbyid, 4, d.semesterid)
+                                    }} id={d.id + "e"}>
+                                        <div className={"resize-grab"} id={"grabup"} style={{
+                                            backgroundColor: getResizeBarColor(d.usercreatedbyid, 4, d.semesterid)
+                                        }}></div>
+                                        <div style={{maxHeight: "60%"}} className={"no-pointer-events"}>
+                                            <p>{internal_to_time(d.timestart) + " - " + internal_to_time(d.timeend)}</p>
+                                            <p>{d.info}</p>
+                                        </div>
+                                        <div className={"resize-grab"} id={"grabdown"} style={{
+                                            backgroundColor: getResizeBarColor(d.usercreatedbyid, 4, d.semesterid)
+                                        }}></div>
+                                    </div>))}
+                                </div>
+
+
+                                <div className={"spalte"}
+                                     id={"5"} style={{gridTemplateRows: `repeat(96, ${cellHeight}px)`, backgroundColor: grayedOut[5] ? "#aaaaaa" : "#ffffff"}}
+                                     onMouseDown={e => onMouseDown(e)}
+                                     onMouseMove={e => onMouseMove(e)}
+                                     onMouseUp={e => onMouseUp(e)}>
+
+
+                                    {entries[5].map(d => (d != null && <div className={"entry"} style={{
+                                        width: "100%",
+                                        gridRowStart: d.timestart,
+                                        gridRowEnd: d.timeend,
+                                        backgroundColor: getEntryColor(d.usercreatedbyid, 5, d.semesterid)
+                                    }} id={d.id + "e"}>
+                                        <div className={"resize-grab"} id={"grabup"} style={{
+                                            backgroundColor: getResizeBarColor(d.usercreatedbyid, 5, d.semesterid)
+                                        }}></div>
+                                        <div style={{maxHeight: "60%"}} className={"no-pointer-events"}>
+                                            <p>{internal_to_time(d.timestart) + " - " + internal_to_time(d.timeend)}</p>
+                                            <p>{d.info}</p>
+                                        </div>
+                                        <div className={"resize-grab"} id={"grabdown"} style={{
+                                            backgroundColor: getResizeBarColor(d.usercreatedbyid, 5, d.semesterid)
+                                        }}></div>
+                                    </div>))}
+                                </div>
+                            </div>
+
+
+                            <div className={"overlay"} style={{backgroundColor: "rgba(0, 0, 0, 0)"}}>
+                                {/*maps a list of internal time stamps to lines and time stamps*/}
+                                {temp.map(i => (<div style={{
+                                    width: "100%",
+                                    height: cellHeight * 2,
+                                    display: "flex",
+                                    flexDirection: "row",
+                                    justifyContent: "space-around",
+                                    alignItems: "center",
+                                }} className={"no-pointer-events"}>
+                                    <div style={{
+                                        borderBottom: (i / 4 === 7 || i / 4 === 18 ? "3px solid #fc3d03" : "1px solid #363636"),
+                                    }}><p style={{
+                                        color: "gray",
+                                        marginTop: cellHeight - 3,
+                                        marginRight: 120,
+                                        fontSize: 12,
+                                        textAlign: "center"
+                                    }}>{internal_to_time(i + 1)}</p></div>
+
+                                    <div style={{
+                                        borderBottom: (i / 4 === 7 || i / 4 === 18 ? "3px solid #fc3d03" : "1px solid #363636"),
+                                    }}><p style={{
+                                        color: "gray",
+                                        marginTop: cellHeight - 3,
+                                        marginRight: 120,
+                                        fontSize: 12,
+                                        textAlign: "center"
+                                    }}>{internal_to_time(i + 1)}</p></div>
+                                    <div style={{
+                                        borderBottom: (i / 4 === 7 || i / 4 === 18 ? "3px solid #fc3d03" : "1px solid #363636"),
+                                    }}><p style={{
+                                        color: "gray",
+                                        marginTop: cellHeight - 3,
+                                        marginRight: 120,
+                                        fontSize: 12,
+                                        textAlign: "center"
+                                    }}>{internal_to_time(i + 1)}</p></div>
+                                    <div style={{
+                                        borderBottom: (i / 4 === 7 || i / 4 === 18 ? "3px solid #fc3d03" : "1px solid #363636"),
+                                    }}><p style={{
+                                        color: "gray",
+                                        marginTop: cellHeight - 3,
+                                        marginRight: 120,
+                                        fontSize: 12,
+                                        textAlign: "center"
+                                    }}>{internal_to_time(i + 1)}</p></div>
+                                    <div style={{
+                                        borderBottom: (i / 4 === 7 || i / 4 === 18 ? "3px solid #fc3d03" : "1px solid #363636"),
+                                    }}><p style={{
+                                        color: "gray",
+                                        marginTop: cellHeight - 3,
+                                        marginRight: 120,
+                                        fontSize: 12,
+                                        textAlign: "center"
+                                    }}>{internal_to_time(i + 1)}</p></div>
+                                    <div style={{
+                                        borderBottom: (i / 4 === 7 || i / 4 === 18 ? "3px solid #fc3d03" : "1px solid #363636"),
+                                    }}><p style={{
+                                        color: "gray",
+                                        marginTop: cellHeight - 3,
+                                        marginRight: 120,
+                                        fontSize: 12,
+                                        textAlign: "center"
+                                    }}>{internal_to_time(i + 1)}</p></div>
+                                </div>))}
+                            </div>
+                        </div>
+                    </div>
+                </div>
+            </div>
+            <div className={"error-bar"}>
+                {errorState.map((e, index) => (
+                    <div style={{
+                        display: e === ErrorType.Okay ? "none" : "flex",
+                        width: "90%",
+                        backgroundColor: e === ErrorType.Okay ? "white" : "#e5a10e",
+                        borderRadius: 15,
+                        flexDirection: "column",
+                        justifyContent: "center",
+                        gap: 10,
+                        alignItems: "center",
+                        minHeight: 120,
+                        maxHeight: 120,
+                        padding: 10
+                    }} className={"box-shadow"}>
+                        <p style={{
+                            borderRadius: 15,
+                            backgroundColor: "#346991",
+                            width: "90%",
+                            paddingTop: 1,
+                            paddingBottom: 1,
+                            color: "white",
+                            textAlign: "center"
+                        }}>{new Date(currentYear, 0, currentWeekStartDay + index).toLocaleDateString()}</p>
+                        <p style={{
+                            textAlign: "center"
+                        }}>{e}</p>
+                    </div>))}
+            </div>
+        </div>
+    )
+}

anwendung/src/components/Constants.js

@@ -0,0 +1,2 @@
+//export const baseURL = "http://185.245.96.48:8080"
+export const baseURL = "http://localhost:8080"

anwendung/src/components/DateElement.jsx

@@ -0,0 +1,21 @@
+function addDays(date, days) {
+    let result = new Date(date);
+    result.setDate(result.getDate() + days);
+    return result;
+}
+
+export default function DateElement(p){
+
+    let startDate = new Date(p.year, 0, p.startday);
+    let endDate = new Date(p.year, 0, p.startday + 5);
+
+    let startDateString = `${startDate.getDate()}.${startDate.getMonth()+1}.${startDate.getFullYear()}`;
+    let endDateString = `${endDate.getDate()}.${endDate.getMonth()+1}.${endDate.getFullYear()}`;
+    return (
+        <>
+            <div className="dateElement round-border box-shadow">
+                <p>{startDateString} - {endDateString}</p>
+            </div>
+        </>
+    );
+}

anwendung/src/components/ErrorType.js

@@ -0,0 +1,8 @@
+export const ErrorType = {
+    Okay: "Okay",
+    TooLong: "Zu lang, maximal 8h pro Tag!",
+    TooEarly: "Wenn möglich nicht vor 8:00",
+    TooLate: "Wenn möglich nicht nach 17:00",
+    NotEnoughLunchTime: "Mind. 45min Pause zwischen 11:00 - 14:00",
+    Saturday: "Wenn möglich nicht am Samstag"
+}

anwendung/src/components/HelpButton.jsx

@@ -0,0 +1,19 @@
+import Button from "@/components/Button";
+import {helpButton} from "@/components/Icons";
+import {useRouter} from "next/router";
+
+export default function HelpButton(p)
+{
+    const router = useRouter()
+
+    return (
+        <div style={{
+            position: "absolute",
+            bottom: 20,
+            right: 20,
+            borderRadius: 15
+        }} className={"box-shadow"}>
+            <Button width={40} height={40} color={"white"} icon={helpButton} onClick={() => router.push("/help")}/>
+        </div>
+    )
+}

anwendung/src/components/Icons.js

@@ -0,0 +1,19 @@
+export const arrowLeft = `<svg xmlns="http://www.w3.org/2000/svg" fill="white" class="bi bi-arrow-left" viewBox="0 0 16 16">
+  <path fill-rule="evenodd" d="M15 8a.5.5 0 0 0-.5-.5H2.707l3.147-3.146a.5.5 0 1 0-.708-.708l-4 4a.5.5 0 0 0 0 .708l4 4a.5.5 0 0 0 .708-.708L2.707 8.5H14.5A.5.5 0 0 0 15 8z"/>
+</svg>`
+
+export const arrowRight = `<svg xmlns="http://www.w3.org/2000/svg" fill="white" class="bi bi-arrow-right" viewBox="0 0 16 16">
+  <path fill-rule="evenodd" d="M1 8a.5.5 0 0 1 .5-.5h11.793l-3.147-3.146a.5.5 0 0 1 .708-.708l4 4a.5.5 0 0 1 0 .708l-4 4a.5.5 0 0 1-.708-.708L13.293 8.5H1.5A.5.5 0 0 1 1 8z"/>
+</svg>`
+
+export const deleteItem = `<svg xmlns="http://www.w3.org/2000/svg" fill="black" class="bi bi-trash-fill" viewBox="0 0 16 16">
+  <path d="M2.5 1a1 1 0 0 0-1 1v1a1 1 0 0 0 1 1H3v9a2 2 0 0 0 2 2h6a2 2 0 0 0 2-2V4h.5a1 1 0 0 0 1-1V2a1 1 0 0 0-1-1H10a1 1 0 0 0-1-1H7a1 1 0 0 0-1 1H2.5zm3 4a.5.5 0 0 1 .5.5v7a.5.5 0 0 1-1 0v-7a.5.5 0 0 1 .5-.5zM8 5a.5.5 0 0 1 .5.5v7a.5.5 0 0 1-1 0v-7A.5.5 0 0 1 8 5zm3 .5v7a.5.5 0 0 1-1 0v-7a.5.5 0 0 1 1 0z"/>
+</svg>`
+
+export const editItem = `<svg xmlns="http://www.w3.org/2000/svg" fill="black" class="bi bi-pencil-fill" viewBox="0 0 16 16">
+  <path d="M12.854.146a.5.5 0 0 0-.707 0L10.5 1.793 14.207 5.5l1.647-1.646a.5.5 0 0 0 0-.708l-3-3zm.646 6.061L9.793 2.5 3.293 9H3.5a.5.5 0 0 1 .5.5v.5h.5a.5.5 0 0 1 .5.5v.5h.5a.5.5 0 0 1 .5.5v.5h.5a.5.5 0 0 1 .5.5v.207l6.5-6.5zm-7.468 7.468A.5.5 0 0 1 6 13.5V13h-.5a.5.5 0 0 1-.5-.5V12h-.5a.5.5 0 0 1-.5-.5V11h-.5a.5.5 0 0 1-.5-.5V10h-.5a.499.499 0 0 1-.175-.032l-.179.178a.5.5 0 0 0-.11.168l-2 5a.5.5 0 0 0 .65.65l5-2a.5.5 0 0 0 .168-.11l.178-.178z"/>
+</svg>`
+
+export const helpButton = `<svg xmlns="http://www.w3.org/2000/svg" fill="black" class="bi bi-question" viewBox="0 0 16 16">
+  <path d="M5.255 5.786a.237.237 0 0 0 .241.247h.825c.138 0 .248-.113.266-.25.09-.656.54-1.134 1.342-1.134.686 0 1.314.343 1.314 1.168 0 .635-.374.927-.965 1.371-.673.489-1.206 1.06-1.168 1.987l.003.217a.25.25 0 0 0 .25.246h.811a.25.25 0 0 0 .25-.25v-.105c0-.718.273-.927 1.01-1.486.609-.463 1.244-.977 1.244-2.056 0-1.511-1.276-2.241-2.673-2.241-1.267 0-2.655.59-2.75 2.286zm1.557 5.763c0 .533.425.927 1.01.927.609 0 1.028-.394 1.028-.927 0-.552-.42-.94-1.029-.94-.584 0-1.009.388-1.009.94z"/>
+</svg>`

anwendung/src/components/InputForm.jsx

@@ -0,0 +1,361 @@
+import Button from "@/components/Button";
+import {useRouter} from "next/router";
+import {useEffect, useState} from "react";
+import Background from "@/components/Background";
+import {baseURL} from "@/components/Constants";
+import Back from "@/components/Back";
+
+let modulesDummy = [
+    ["Analysis", "Theo Inf 1"],
+    ["Lineare Algebra", "Anwendungsprojekt"],
+    ["Theo Inf 3", "Software Eng"],
+    ["Security", "BWL"],
+    ["Software Eng", "Security"],
+    ["Studienarbeit", "Bachelor"]
+]
+
+let tempSemesterNumber = 0
+let update = false
+
+let baseMapping = []
+
+export default function InputForm(p) {
+
+    const [startDate, setStartDate] = useState("0000-00-00")
+    const [endDate, setEndDate] = useState("0000-00-00")
+    const [courseName, setCourseName] = useState("")
+    const [semesterNumber, setSemesterNumber] = useState(0)
+    const [users, setUsers] = useState([])
+    const [modulesSelectorValues, setModulesSelectorValues] = useState(["nothing", "nothing"])
+    const [userModulesMapping, setUserModulesMapping] = useState({})
+    const [isChecked, setIsChecked] = useState([])
+    const [isActivated, setIsActivated] = useState([])
+    const router = useRouter()
+
+    useEffect(() => {
+
+        let base = baseURL + "/semester/id?sessionid=" + localStorage.getItem("sessionid") + "&id=" + localStorage.getItem("currentsid")
+        fetch(base).then(r => r.json()).then(j => {
+            setCourseName(j.name)
+
+            let tempStartDate = new Date(parseInt(j.startyear), 0, parseInt(j.startday))
+            let tempEndDate = new Date(parseInt(j.endyear), 0, parseInt(j.endday))
+
+            setStartDate(tempStartDate.getFullYear() + "-" + ((tempStartDate.getMonth() + 1).toString().padStart(2, "0")) + "-" + tempStartDate.getDate().toString().padStart(2, "0"))
+            setEndDate(tempEndDate.getFullYear() + "-" + ((tempEndDate.getMonth() + 1).toString().padStart(2, "0")) + "-" + tempEndDate.getDate().toString().padStart(2, "0"))
+
+            setSemesterNumber(j.number)
+            tempSemesterNumber = j.number
+
+        }).then(() => {
+            readModules()
+            update = true
+        }).catch(() => readModules())
+
+
+    }, [])
+
+    function readModules() {
+        let usersTemp = []
+
+        let userURL = baseURL + "/users/all?sessionid=" + localStorage.getItem("sessionid")
+        fetch(userURL).then(r => r.json()).then(j => {
+            setUsers(j)
+            usersTemp = j
+            let temp = [false, false, false]
+            let temp2 = []
+            for (let i = 0; i < j.length; i++) {
+                temp.push(false)
+                temp2.push(false)
+            }
+            setIsChecked(temp)
+            setIsActivated(temp2)
+        }).then(() => {
+            let modulesURL = baseURL + "/module/bysemesterid?sessionid=" + localStorage.getItem("sessionid") + "&semesterid=" + localStorage.getItem("currentsid");
+            fetch(modulesURL).then(r => r.json()).then(j => {
+
+                setUserModulesMapping(j)
+                baseMapping = j
+
+                let temp = isChecked.slice()
+                let temp2 = isActivated.slice()
+
+                for (let i = 0; i < usersTemp.length; i++) {
+                    let currentUser = usersTemp[i]
+
+                    let found = false
+                    let foundModuleLast = null
+                    for (let f = 0; f < j.length; f++) {
+                        let currentModule = j[f]
+
+                        if (currentModule.userid === currentUser.id) {
+                            found = true
+                            foundModuleLast = currentModule
+                        }
+                    }
+
+                    if (found) {
+                        temp[i] = true
+
+                        temp2[i] = foundModuleLast.activated === 1
+                    }
+                }
+
+                setIsChecked(temp)
+                setIsActivated(temp2)
+            })
+        }).then(() => {
+            setModulesSelectorValues(modulesDummy[tempSemesterNumber])
+        })
+    }
+
+    function onCourseNameChange(e) {
+        setCourseName(e.target.value)
+    }
+
+    function onStartDateChange(e) {
+        setStartDate(e.target.value)
+    }
+
+    function onEndDateChange(e) {
+        setEndDate(e.target.value)
+    }
+
+    function onSemesterNumberChange(e) {
+        setSemesterNumber(e.target.value)
+        setModulesSelectorValues(modulesDummy[e.target.value])
+    }
+
+    function isOptionSelected(e, userid) {
+        let found = false;
+
+        for (let i = 0; i < userModulesMapping.length; i++) {
+            let current = userModulesMapping[i]
+            if (current.name === e && current.userid === userid) {
+                found = true;
+            }
+        }
+
+
+        return found;
+    }
+
+    function onCheckedChange(e, index) {
+        let temp = isChecked.slice()
+        temp[index] = e.target.checked
+        setIsChecked(temp)
+
+        if (!e.target.checked) {
+            let temp = []
+            let currentUser = users[index]
+            for (let j = 0; j < userModulesMapping.length; j++) {
+                if (userModulesMapping[j].userid !== currentUser.id) {
+                    temp.push(userModulesMapping[j])
+                }
+            }
+
+            setUserModulesMapping(temp)
+        }
+    }
+
+    function onActivatedChange(e, index) {
+
+        let temp = isActivated.slice()
+        temp[index] = e.target.checked
+        setIsActivated(temp)
+
+        let userid = users[index].id
+
+        for (let j = 0; j < userModulesMapping.length; j++) {
+            if (userModulesMapping[j].userid === userid) {
+                userModulesMapping[j].activated = e.target.checked ? 1 : 0
+            }
+        }
+    }
+
+    function onModuleSelectionChange(e, index) {
+        let userid = users[index].id
+
+        let newMapping = []
+        let oldNamesIds = new Map()
+
+        for (let j = 0; j < userModulesMapping.length; j++) {
+            let currentModuleMapping = userModulesMapping[j]
+            if (currentModuleMapping.userid != userid) {
+                newMapping.push(currentModuleMapping)
+            } else {
+                oldNamesIds.set(currentModuleMapping.name, currentModuleMapping.id)
+            }
+        }
+
+        let found = false
+        for (let i = 0; i < e.target.options.length; i++) {
+
+            let currentOption = e.target.options[i]
+            if (currentOption.selected) {
+                found = true
+
+                newMapping.push({
+                    "id": oldNamesIds.has(currentOption.value) ? oldNamesIds.get(currentOption.value) : -1,
+                    "userid": userid,
+                    "semesterid": -1,
+                    "name": currentOption.value,
+                    "activated": isActivated[index] ? 1 : 0
+                })
+            }
+        }
+
+        let temp = isChecked.slice()
+        temp[index] = found
+        setIsChecked(temp)
+
+        setUserModulesMapping(newMapping)
+    }
+
+    function onButtonAbort() {
+        router.back()
+    }
+
+    function onButtonSave() {
+        let tempDateStart = new Date(parseInt(startDate.split("-")[0]), parseInt(startDate.split("-")[1]) - 1, parseInt(startDate.split("-")[2]))
+        let tempDateEnd = new Date(parseInt(endDate.split("-")[0]), parseInt(endDate.split("-")[1]) - 1, parseInt(endDate.split("-")[2]))
+
+        let startDayInYear = Math.round((tempDateStart - new Date(tempDateStart.getFullYear(), 0, 0)) / (1000 * 60 * 60 * 24))
+        let endDayInYear = Math.round((tempDateEnd - new Date(tempDateEnd.getFullYear(), 0, 0)) / (1000 * 60 * 60 * 24))
+
+
+        let semesterJson = {
+            "id": update ? localStorage.getItem("currentsid") : 0,
+            "startday": startDayInYear,
+            "endday": endDayInYear,
+            "name": courseName,
+            "startyear": tempDateStart.getFullYear(),
+            "endyear": tempDateEnd.getFullYear(),
+            "number": semesterNumber
+        }
+
+        fetch(baseURL + "/semester?sessionid=" + localStorage.getItem("sessionid"), {
+            method: update ? "PUT" : "POST",
+            headers: {"Content-Type": "application/json"},
+            body: JSON.stringify(semesterJson)
+        }).then(r => r.json()).then(async sem => {
+            let semesterID = sem.id
+
+            for (let i = 0; i < baseMapping.length; i++) {
+                let found = false
+                for (let j = 0; j < userModulesMapping.length; j++) {
+                    if (baseMapping[i].name === userModulesMapping[j].name) {
+                        found = true
+                    }
+                }
+
+                if (!found) {
+                    fetch(baseURL + "/module?sessionid=" + localStorage.getItem("sessionid") + "&id=" + baseMapping[i].id, {
+                        method: "DELETE"
+                    })
+                }
+            }
+
+            for (let i = 0; i < userModulesMapping.length; i++) {
+
+                userModulesMapping[i].semesterid = semesterID
+                setTimeout(() => {
+                    console.log(userModulesMapping[i])
+                    fetch(baseURL + "/module?sessionid=" + localStorage.getItem("sessionid"), {
+                        method: userModulesMapping[i].id === -1 ? "POST" : "PUT",
+                        headers: {"Content-Type": "application/json"},
+                        body: JSON.stringify(userModulesMapping[i])
+                    })
+                }, i * 100)
+
+            }
+        })
+
+        router.back()
+    }
+
+    return (
+        <>
+            <Background/>
+            <div className={"box-shadow input-form round-border"}>
+
+                <p>Kursname</p>
+                <input type={"text"} className={"box-shadow round-border"} style={{padding: 8, width: "100%"}}
+                       onChange={e => onCourseNameChange(e)} value={courseName}/>
+
+                <div style={{display: "flex", justifyContent: "flex-start", gap: 40}}>
+                    <p>Theorie Anfang</p>
+                    <p>Theorie Ende</p>
+                </div>
+                <div style={{display: "flex", justifyContent: "flex-start", gap: 20}}>
+                    <input type={"date"} className={"box-shadow round-border"} style={{padding: 8}}
+                           onChange={e => onStartDateChange(e)} value={startDate}/>
+                    <input type={"date"} className={"box-shadow round-border"} style={{padding: 8}}
+                           onChange={e => onEndDateChange(e)} value={endDate}/>
+                </div>
+
+                <p>Semester Wählen</p>
+                <select className={"round-border box-shadow"} style={{padding: 5, width: "100%"}} value={semesterNumber}
+                        onChange={e => onSemesterNumberChange(e)}>
+                    <option value={0}>1. Semester</option>
+                    <option value={1}>2. Semester</option>
+                    <option value={2}>3. Semester</option>
+                    <option value={3}>4. Semester</option>
+                    <option value={4}>5. Semester</option>
+                    <option value={5}>6. Semester</option>
+                </select>
+
+                <div className={"table-wrapper"}>
+                    <table>
+                        <tbody>
+                        <tr>
+                            <th>Wählen</th>
+                            <th>Freischalten</th>
+                            <th>Dozent</th>
+                            <th>Modul</th>
+                        </tr>
+                        {
+                            users.map((user, index) => (
+                                <tr>
+                                    <td>
+                                        <input type={"checkbox"} checked={isChecked[index]}
+                                               onChange={e => onCheckedChange(e, index)}/>
+                                    </td>
+                                    <td>
+                                        <input type={"checkbox"} checked={isActivated[index]}
+                                               onChange={e => onActivatedChange(e, index)}/>
+                                    </td>
+                                    <td>
+                                        {user.firstName + " " + user.lastName}
+                                    </td>
+                                    <td>
+                                        <select multiple={true} className={"box-shadow round-border"}
+                                                style={{padding: 5}}
+                                                onChange={e => onModuleSelectionChange(e, index)}>
+                                            {modulesSelectorValues.map(msv => (
+                                                <option value={msv}
+                                                        selected={isOptionSelected(msv, user.id)}>{msv}</option>
+                                            ))}
+                                        </select>
+                                    </td>
+                                </tr>
+                            ))
+                        }
+                        </tbody>
+                    </table>
+                </div>
+
+                <div style={{
+                    display: "flex",
+                    justifyContent: "flex-end",
+                    alignItems: "center",
+                    width: "100%",
+                    gap: 10
+                }}>
+                    <Button text={"Abbrechen"} onClick={onButtonAbort}/>
+                    <Button text={"Speichern"} color={"#77932b"} onClick={onButtonSave}/>
+                </div>
+            </div>
+        </>
+    )
+}

anwendung/src/components/Login.jsx

@@ -0,0 +1,75 @@
+import React, {useState} from "react";
+import Button from "@/components/Button";
+import {NextResponse} from "next/server";
+import Link from "next/link";
+import {useRouter} from "next/router";
+import {baseURL} from "@/components/Constants";
+
+export default function Login() {
+
+    let url = baseURL + "/users"
+
+    async function on_login_click() {
+        url += "?mail=" + inputUserName + "&password=" + inputPassword;
+
+        let response = await fetch(url, {
+            method: "GET",
+        });
+
+        let reader = response.body.getReader();
+        let value = String.fromCharCode.apply(null, ((await reader.read()).value))
+        if (value != "failed") {
+            localStorage.setItem("sessionid", value);
+
+            url = baseURL + "/users/check?sessionid=" + value;
+            fetch(url).then(r => r.json()).then(u => localStorage.setItem("userid", u.id))
+            let admin = 0
+            await fetch(url).then(o => o.json()).then(user => {
+                admin = user.permissions})
+            localStorage.setItem("admin", admin)
+            if(admin === 1) {
+                await router.push("/semesteroverview")
+            }else await router.push("/semesteroverviewLecturer")
+
+        } else {
+            setInputPassword("");
+            setInputUserName("");
+            setHint("wrong login credentials")
+        }
+    }
+
+    const [inputUserName, setInputUserName] = useState("")
+    const [inputPassword, setInputPassword] = useState("")
+    const [hint, setHint] = useState("type here")
+    const [backgroundColor, setBackgroundColor] = useState("rgb(255, 255, 255)")
+    const router = useRouter()
+
+
+    return (
+        // <div className="border">
+            <login className={"login-container box-shadow"}>
+                <p className={"font-big-fat placement"}>Login</p>
+                <div className={"placement"}>
+                    <br/>
+                    <p className={"font-kinda-big"}>Username</p>
+                    <input type="text" value={inputUserName} onChange={e => setInputUserName(e.target.value.toLowerCase())}
+                           placeholder={hint} className="input input-bordered input-sm w-full max-w-xs box-shadow"
+                           style={{
+                               backgroundColor: backgroundColor
+                           }}/>
+                    <br/>
+                    <p className={"font-kinda-big"}>Password</p>
+                    <input type="password" value={inputPassword} onChange={e => setInputPassword(e.target.value)}
+                           placeholder={hint} className="input input-bordered input-sm w-full max-w-xs box-shadow"
+                           style={{
+                               backgroundColor: backgroundColor
+                           }}/>
+                </div>
+
+                <Button text={"Login"} color={"#77932b"} width={100} height={40} onClick={() => on_login_click()}/>
+
+
+            </login>
+        // </div>
+    );
+}

anwendung/src/components/Logout.jsx

@@ -0,0 +1,29 @@
+import Button from "@/components/Button";
+import {useRouter} from "next/router";
+import {baseURL} from "@/components/Constants";
+
+export default function Logout()
+{
+    const router = useRouter()
+
+    async function logout()
+    {
+        let url = baseURL + "/users/logout?sessionid=" + localStorage.getItem("sessionid");
+        await fetch(url)
+        await router.push("/")
+    }
+
+    return (
+        <div style={{
+            position: "absolute",
+            right: 20,
+            top: 20,
+            width: 130,
+            height: 60,
+            borderBottomRightRadius: 10,
+
+        }}>
+            <Button onClick={() => logout()} text={"Logout"} color={"#77932b"} width={100} height={40}/>
+        </div>
+    )
+}

anwendung/src/components/PopUp.jsx

@@ -0,0 +1,28 @@
+import Button from "@/components/Button";
+import {useState} from "react";
+
+let shown = false;
+
+export default function PopUp(p) {
+
+
+    return (
+        <>
+            <div style={{
+                display: p.displayState
+            }}>
+
+                <div className={"modal-container"}>
+                    <div className={"modal box-shadow"}>
+                        <p className={"font-middle"}>{p.hint}</p>
+                        <div>
+                            <Button text={p.text1} color={"rgba(54,54,54,0.64)"} onClick={p.function1}/>
+                            <Button text={p.text2} color={"#77932b"} onClick={p.function2}/>
+                        </div>
+                    </div>
+                </div>
+            </div>
+
+        </>
+    )
+}

anwendung/src/components/SemesterTile.jsx

@@ -0,0 +1,49 @@
+import StatusBar from "@/components/StatusBar";
+import React, {useEffect} from "react";
+import Button from "@/components/Button";
+import {deleteItem, editItem} from "@/components/Icons";
+
+export default function SemesterTile(p)
+{
+    let editable = true;
+    let color = "#ffffff"
+    if (p.color != null)
+    {
+        color = p.color;
+    }
+    if (p.editable != null)
+    {
+        editable = p.editable
+    }
+    useEffect(() =>
+    {
+        window.addEventListener("contextmenu", (e) => (e.preventDefault()))
+    })
+
+    return (
+        <div
+            style={{
+                display: "flex",
+                flexDirection: "column",
+                justifyContent: "center",
+                alignItems: "center",
+                backgroundColor: "rgba(0,0,0,0)"
+            }}
+            onClick={(e) => p.onClick(e)}>
+            <p className={"semester-tile-p"} style={{
+            }}>{p.text}</p>
+            <p className={"semester-tile-p"} style={{
+                color: "gray"
+            }}>{p.text2}</p>
+            <div style={{
+                display: editable ? "flex" : "none",
+                flexDirection: "row",
+                justifyContent: "center",
+                alignItems: "center",
+                gap: 5
+            }}>
+
+            </div>
+        </div>
+    )
+}

anwendung/src/components/StatusBar.jsx

@@ -0,0 +1,26 @@
+import React from "react"
+
+export default function StatusBar(p)
+{
+    if(p.progress > 100) p.progress = 100;
+    let classNames = ["not-started", "started", "finished"];
+    let index = p.progress / 50;
+
+    let actives = ["", "", ""]
+    actives[index] = "active";
+
+    return (
+        <div className={"step-container"}>
+            <div className={"steps"}>
+                <span className={"step " + classNames[0] + " " + actives[0]}>1</span>
+                <span className={"step " + classNames[1] + " " + actives[1]}>2</span>
+                <span className={"step " + classNames[2] + " " + actives[2]}>3</span>
+                <div className={"progress-bar " + classNames[index]}
+                     style={{
+                         width: p.progress + "%"
+                     }}
+                ></div>
+            </div>
+        </div>
+    )
+}

anwendung/src/components/SubmitButton.jsx

@@ -0,0 +1,21 @@
+import Button from "@/components/Button";
+import { baseURL } from "@/components/Constants";
+import {useRouter} from "next/router";
+
+export default function SubmitButton() {
+
+    const router = useRouter();
+
+    return (
+        <div
+            style={{
+                position: "absolute",
+                right: 70,
+                bottom: 20,
+                borderBottomRightRadius: 10,
+            }}
+        >
+            <Button onClick={() => router.push("/submit")} text={"Abgeben"} color={"#77932b"} width={100} height={40} />
+        </div>
+    );
+}

anwendung/src/components/SubmitWarning.jsx

@@ -0,0 +1,56 @@
+import {baseURL} from "@/components/Constants";
+import Button from "@/components/Button";
+
+export default function SubmitWarning(p){
+
+    async function submit() {
+        let url = baseURL + "/module?sessionid=" + localStorage.getItem("sessionid");
+
+        let json1 = {
+            "id": 0,
+            "userid": localStorage.getItem("userid"),
+            "semesterid": localStorage.getItem("currentsid"),
+            "name": localStorage.getItem("currentmodulename"),
+            "activated": 0
+        }
+
+        await fetch(url, {
+            method: "PUT",
+            headers: {"Content-Type": "application/json"},
+            body: JSON.stringify(json1)
+        })
+
+        p.onClick();
+        p.onClick();
+
+    }
+
+    return (
+        <div className="box-shadow" style={{
+            position: "absolute",
+            top: 300,
+            left: 0,
+            right: 0,
+            borderRadius: 5,
+            textAlign: "center",
+            fontSize: 20,
+            margin: "auto",
+            width: 600
+
+        }}>
+            <p style={{paddingTop: 20, paddingBottom: 5}}>Möchten Sie wirklich abgeben?</p>
+            <p>Danach können Sie keine Änderungen mehr vornehmen!</p>
+            <div style={{
+                display: "flex",
+                flexDirection: "row",
+                justifyContent: "center",
+                paddingTop: 40,
+                paddingBottom: 20
+            }}>
+                <Button onClick={() => submit()} text={"Bestätigen"} color={"#77932b"} width={100} height={40} />
+                <div style={{width: 20}}></div>
+                <Button onClick={() => p.onClick()} text={"Abbrechen"} color={"red"} width={100} height={40} />
+            </div>
+        </div>
+    )
+}

anwendung/src/components/Test.jsx

@@ -0,0 +1,19 @@
+export default function Test(p)
+{
+
+    // let datum = new Date(2023, 1, 10);
+    // let start = new Date(datum.getFullYear(), 0, 0);
+    //
+    // let difference = (datum - start) / (1000 * 60 * 60 * 24)
+
+
+    let day = 41
+    let datum = new Date(2023, 0, 30)
+
+    return (
+
+        <div>
+            <p>{datum.getMonth()}</p>
+        </div>
+    );
+}

anwendung/src/components/Tile.jsx

@@ -0,0 +1,67 @@
+import React from 'react';
+
+const Tile = () => {
+    const [isHovered, setIsHovered] = React.useState(false);
+    const [cursorPosition, setCursorPosition] = React.useState({ x: 0, y: 0 });
+    const tileRef = React.useRef(null);
+
+    const handleMouseEnter = () => {
+        setIsHovered(true);
+    };
+
+    const handleMouseLeave = () => {
+        setIsHovered(false);
+    };
+
+    const handleMouseMove = (event) => {
+        if (tileRef.current) {
+            const rect = tileRef.current.getBoundingClientRect();
+            setCursorPosition({
+                x: event.clientX - rect.left,
+                y: event.clientY - rect.top,
+            });
+        }
+    };
+
+    return (
+        <div
+            ref={tileRef}
+            onMouseEnter={handleMouseEnter}
+            onMouseLeave={handleMouseLeave}
+            onMouseMove={handleMouseMove}
+            style={{
+                backgroundColor: 'rgba(255,0,0,0.89)',
+                width: '250px',
+                height: '150px',
+                margin: '10px',
+                transition: 'transform 0.2s',
+                transform: isHovered ? 'translateY(-5px)' : 'none',
+                position: 'relative',
+                borderRadius: '10px',
+                display: 'flex',
+                justifyContent: 'center',
+                alignItems: 'center',
+            }}
+        >
+            <span style = {{ color: 'white', fontWeight: 'bold'}}>Kalender</span>
+
+
+            {isHovered && (
+                <div
+                    style={{
+                        position: 'absolute',
+                        top: cursorPosition.y - 10,
+                        left: cursorPosition.x - 10,
+                        width: '20px',
+                        height: '20px',
+                        borderRadius: '50%',
+                        background:
+                            'radial-gradient(circle at center, rgba(255, 255, 255) 0%, rgba(255,255,255,0) 70%)',
+                    }}
+                />
+            )}
+        </div>
+    );
+};
+
+export default Tile;

anwendung/src/components/WeekSelector.jsx

@@ -0,0 +1,20 @@
+import Button from "@/components/Button";
+import DateElement from "@/components/DateElement";
+import { arrowLeft } from "./Icons"
+import { arrowRight } from "./Icons"
+import { useState } from 'react'
+
+
+
+export default function WeekSelector(p){
+
+    return (
+        <>
+            <div className="weekSelector">
+                <Button icon={arrowLeft} onClick={() => p.onFunctionLeft()} width={50} color={"#346991"}/>
+                <DateElement year={p.year} startday={p.startday}/>
+                <Button icon={arrowRight} onClick={() => p.onFunctionRight()} width={50} color={"#346991"}/>
+            </div>
+        </>
+    )
+}

anwendung/src/pages/_app.js

@@ -0,0 +1,7 @@
+import '@/styles/globals.css'
+import '@/styles/calendarSideBar.css'
+import '@/styles/helppage.css'
+
+export default function App({ Component, pageProps }) {
+  return <Component {...pageProps} />
+}

anwendung/src/pages/api/hello.js

@@ -0,0 +1,5 @@
+// Next.js API route support: https://nextjs.org/docs/api-routes/introduction
+
+export default function handler(req, res) {
+  res.status(200).json({ name: 'John Doe' })
+}

anwendung/src/pages/browserNotSupported.js

@@ -0,0 +1,20 @@
+export default function BrowserNotSupported(p)
+{
+    return (
+        <div style={{
+            display: "flex",
+            flexDirection: "column",
+            justifyContent: "center",
+            alignItems: "center",
+            height: "100vh",
+        }} >
+            <p style={{
+                fontSize: 40,
+                color: "red"
+            }}>Sorry but your browser is not supported right now</p>
+            <p style={{
+                fontSize: 30
+            }}>We recommend using Microsoft Edge or Google Chrome</p>
+        </div>
+    )
+}

anwendung/src/pages/createSemester.js

@@ -0,0 +1,17 @@
+import InputForm from "@/components/InputForm";
+import {useRouter} from "next/router";
+import Logout from "@/components/Logout";
+
+export default function CreateSemester()
+{
+    const router = useRouter();
+    let {courseName, startDate, endDate} = router.query;
+
+
+    return (
+        <div className={"normal-centered"}>
+            <Logout/>
+            <InputForm startDate={startDate} endDate={endDate} courseName={courseName}/>
+        </div>
+    )
+}

anwendung/src/pages/help.js

@@ -0,0 +1,97 @@
+import Background from "@/components/Background";
+import Back from "@/components/Back";
+import {useRouter} from "next/router";
+import screen1 from "@/images/screen1.png"
+import screen2 from "@/images/screen2.png"
+import screen3 from "@/images/screen3.png"
+import screen4 from "@/images/screen4.png"
+import screen5 from "@/images/screen5.png"
+import screen6 from "@/images/screen6.png"
+import screen7 from "@/images/screen7.png"
+
+export default function Help(p)
+{
+    const router = useRouter()
+
+    return (
+        <div>
+
+            <div className={"help-line"}>
+                <img src={screen1.src}/>
+                <div className={"text-form"}>
+                    <h1>Die Monats-Seiten-Leiste</h1>
+                    <p>- Hier kannst du sehen in welchem Monat du dich aktuell befindest (blau hinterlegt).</p>
+                    <p>- Durch einen Links-Klick auf eine Monatskacheln kannst du direkt an den Anfang dieses Monats springen</p>
+                </div>
+            </div>
+
+            <div className={"help-line"}>
+                <img src={screen2.src}/>
+                <div className={"text-form"}>
+                    <h1>Die Planungs-Ansicht</h1>
+                    <p>- Hier siehst du alle deine Termine in grün (bzw. gelb bei Warnungen) und von anderen Dozenten in grau</p>
+                    <p>- Durch einen Links-Klick kannst du eine neue Vorlesung an einem Tag erstellen</p>
+                    <p>- Durch Halten der dunkleren Leisten kannst du die Zeiten des Termins anpassen</p>
+                    <p>- Durch Rechts-Klick kannst du eine Vorlesung löschen</p>
+                    <p>- Durch Klicken auf die Pfeiltasten oben kannst du die Woche wechseln</p>
+                    <p>- Bitte beachte, dass du Vorlesungen nur zwischen den beiden Roten linien erstellen kannst</p>
+                    <p>- Ausgegraute Tage liegen nicht im Semester, hier kannst du nicht planen</p>
+                </div>
+            </div>
+
+            <div className={"help-line"}>
+                <img src={screen3.src}/>
+                <div className={"text-form"}>
+                    <h1>Die Warnungs-Ansicht</h1>
+                    <p>- Sollte ein Termin gelb erscheinen kannst du hier sehen woran das liegt</p>
+                    <p>- Warnung sind empfohlene Verbesserungsverschläge aber müssen nicht zwangshaft beachtet werden</p>
+                    <p>- Sollte hier "Okay" für einen Tag stehen ist alles perfekt</p>
+                </div>
+            </div>
+
+            <div className={"help-line"}>
+                <img src={screen5.src}/>
+                <div className={"text-form"}>
+                    <h1>Der Login</h1>
+                    <p>- Hier kannst du dich mit deiner Email und deinem Passwort einloggen</p>
+                </div>
+            </div>
+
+            <div className={"help-line"}>
+                <img src={screen4.src}/>
+                <div className={"text-form"}>
+                    <h1>Der Logout</h1>
+                    <p>- Über diesen Button kannst du dich ausloggen</p>
+                    <p>- Loggst du dich nicht selbst aus, wirst du nach 2 Stunden automatisch ausgeloggt</p>
+                </div>
+            </div>
+
+            <div className={"help-line"}>
+                <img src={screen6.src}/>
+                <div className={"text-form"}>
+                    <h1>Das Dashboard</h1>
+                    <h2>Für Admins:</h2>
+                    <p>- Über den "+" Knopf kannst du ein neues Semester erstellen</p>
+                    <p>- Über den Stift kannst du ein bestehendes Semester editieren</p>
+                    <p>- Über den Mülleimer kannst du ein bestehndes Semester löschen</p>
+                    <h2>Für Dozenten (und Admins):</h2>
+                    <p>- Hier siehst du deine Semester mit den jeweiligen Modulen</p>
+                    <p>- Sollte ein Semester bei dir Ausgegraut sein, wurdest du für dieses schon gewählt aber noch nicht freigeschalten</p>
+                    <p>- Duch einen Links-Klick auf ein weises Semester kann in die Planungsübersicht gewechselt werden</p>
+                </div>
+            </div>
+
+            <div className={"help-line"}>
+                <img src={screen7.src}/>
+                <div className={"text-form"}>
+                    <h1>Semester erstellen / bearbeiten</h1>
+                    <p>- Hier kannst du alle daten wie Name, Start- und Endzeitpunkt eines Semesters eintragen</p>
+                    <p>- Du kannst einen Dozenten "wählen" d.h. er soll in diesem Semester dozieren</p>
+                    <p>- Jedem Dozenten kannst du ein Modul zuordnen, welches er dozieren soll</p>
+                    <p>- Sobald du die Schaltfläche "Freischalten" aktiviert hast, kann der Dozent mit der eigenständigen Planung beginnen.</p>
+                    <p>- Jeder genannte Schritt, insbesondere der Letzte kann auch nachträglich im Bearbeitungsmodus ausgeführt werden</p>
+                </div>
+            </div>
+        </div>
+    )
+}

anwendung/src/pages/index.js

@@ -0,0 +1,41 @@
+import {Inter} from 'next/font/google'
+import React, {useEffect, useState} from "react";
+import Login from "@/components/Login";
+import Background from "@/components/Background";
+import {useRouter} from "next/router";
+import HelpButton from "@/components/HelpButton";
+
+
+const inter = Inter({subsets: ['latin']})
+
+export default function Home(p) {
+    const router = useRouter()
+
+    useEffect(() => {
+        let isEdge = window.navigator.userAgent.indexOf("Edg") > -1
+        let isChrome = window.navigator.userAgent.indexOf("Chrome") > -1
+
+        if(!(isEdge || isChrome))
+        {
+            router.push("/browserNotSupported")
+        }
+    })
+
+    return (
+
+
+        <div className={"normal-centered"}>
+            <Background/>
+            <HelpButton/>
+            <h1 style={{
+                fontSize: 40,
+                fontWeight: "bold",
+                color: "#77932b",
+                marginBottom: "5%",
+                textShadow: "2px 2px 2px rgba(0, 0, 0, 0.2)",
+                textAlign: "center"
+            }}>Willkommen in deinem Vorlesungsplaner</h1>
+            <Login/>
+        </div>
+    )
+}

anwendung/src/pages/planning.js

@@ -0,0 +1,25 @@
+import CalenderView from "@/components/CalenderView";
+import Background from "@/components/Background";
+import Logout from "@/components/Logout";
+import Back from "@/components/Back";
+import BasicDateCalendar from "@/components/CalendarSideBar";
+import {useRouter} from "next/router";
+import HelpButton from "@/components/HelpButton";
+import SubmitButton from "@/components/SubmitButton";
+
+
+export default function planning(p)
+{
+    let router = useRouter()
+
+    return (
+        <div className={"normal-centered"}>
+            <Logout/>
+            <Back onClick={() => router.back()}/>
+            <HelpButton/>
+            <Background/>
+            <CalenderView/>
+            <SubmitButton />
+          </div>
+    )
+}

anwendung/src/pages/semesteroverview.js

@@ -0,0 +1,141 @@
+import Button from "@/components/Button";
+import React, {useEffect, useState} from "react";
+import SemesterTile from "@/components/SemesterTile";
+import InputForm from "@/components/InputForm";
+import {useRouter} from "next/router";
+import PopUp from "@/components/PopUp";
+import Background from "@/components/Background";
+import Logout from "@/components/Logout";
+import {baseURL} from "@/components/Constants";
+import HelpButton from "@/components/HelpButton";
+import StatusBar from "@/components/StatusBar";
+import {deleteItem, editItem} from "@/components/Icons";
+
+export default function SemesterOverview(p) {
+    async function getSemesters() {
+        let urlTest = baseURL + "/semester/all?sessionid=" + localStorage.getItem("sessionid");
+
+
+        await fetch(urlTest).then(response => response.json()).then(s => {
+            setEntries(s)
+        })
+
+    }
+
+    function onClickSemester(e, m) {
+        if (m.target === m.currentTarget) {
+            localStorage.setItem("currentsid", e.id)
+            router.push("/planning")
+        }
+
+    }
+
+    function onClickNewSemester() {
+        localStorage.setItem("currentsid", 0);
+        router.push("/createSemester");
+    }
+
+
+    function togglePopup() {
+        if (modalDisplay === "block") {
+            setModalDisplay("none");
+        } else {
+            setModalDisplay("block");
+        }
+    }
+
+    function funcButtonAbort() {
+        togglePopup();
+    }
+
+    async function funcButtonDelete() {
+        let id = localStorage.getItem("currentsid");
+        let url = baseURL + "/semester?sessionid=" + localStorage.getItem("sessionid") + "&id=" + id;
+        await fetch(url, {
+            method: "DELETE"
+        });
+
+        togglePopup();
+        getSemesters();
+    }
+
+    async function funcButtonEdit(e, m) {
+
+        localStorage.setItem("currentsid", e.id);
+        let semester = e;
+
+        let startYear = semester.startyear;
+        let endYear = semester.endyear;
+        let startDay = semester.startday;
+        let endDay = semester.endday;
+        //+1 because input field shows date in another way then the date object does
+        let startDate = new Date(startYear, 0, startDay + 1);
+        let endDate = new Date(endYear, 0, endDay + 1);
+
+        await router.push({
+            pathname: "/createSemester",
+            query: {
+                courseName: semester.name,
+                startDate: startDate.toISOString().slice(0, 10),
+                endDate: endDate.toISOString().slice(0, 10)
+            },
+        });
+        getSemesters();
+    }
+
+    useEffect(() => {
+        getSemesters();
+
+    }, [])
+
+
+    const [entries, setEntries] = useState([])
+    const [modalDisplay, setModalDisplay] = useState("none");
+    const [modalHint, setModalHint] = useState("");
+    const router = useRouter()
+
+    return (
+        <div className={"semester-overview"}>
+            <Logout/>
+            <HelpButton/>
+            <Background/>
+            {
+                entries.map(e => (
+                    <div className={"semester-tile box-shadow"} onClick={(f) => onClickSemester(e, f)}>
+                        <SemesterTile text={e.name} onClick={(f) => onClickSemester(e, f)} onButtonDeleteClick={() => {
+                            localStorage.setItem("currentsid", e.id)
+                            setModalHint(e.name + " Löschen?");
+                            togglePopup();
+                        }} onButtonEditClick={(m) => {
+                            localStorage.setItem("currentsid", e.id)
+                            funcButtonEdit(e, m);
+                        }}/>
+                        <StatusBar progress={0}/>
+                        <div style={
+                            {
+                                display:"flex",
+                                justifyContent:"center",
+                                alignItems:"center"
+                            }
+                        }>
+                            <Button icon={deleteItem} width={30} height={30} color={"#ffffff"}
+                                    onClick={(m) => {
+                                        localStorage.setItem("currentsid", e.id)
+                                        setModalHint(e.name + " Löschen?");
+                                        togglePopup()
+                                    }}/>
+                            <Button icon={editItem} width={30} height={30} color={"#ffffff"}
+                                    onClick={(m) => {
+                                        localStorage.setItem("currentsid", e.id)
+                                        funcButtonEdit(e, m)
+                                    }}/>
+                        </div>
+                    </div>))
+            }
+            <Button color={"#dcdcdc"} text={"+"} width={240} height={160} fontColor={"black"} fontSize={50}
+                    onClick={() => onClickNewSemester()}/>
+            <PopUp hint={modalHint} text1={"Abbrechen"} text2={"Löschen"} displayState={modalDisplay}
+                   function1={funcButtonAbort} function2={funcButtonDelete}/>
+        </div>
+    )
+}

anwendung/src/pages/semesteroverviewLecturer.js

@@ -0,0 +1,75 @@
+import React, {useEffect, useState} from "react";
+import SemesterTile from "@/components/SemesterTile";
+import {useRouter} from "next/router";
+import Background from "@/components/Background";
+import Logout from "@/components/Logout";
+import {baseURL} from "@/components/Constants"
+import HelpButton from "@/components/HelpButton";
+import StatusBar from "@/components/StatusBar";
+
+export default function SemesteroverviewLecturer(p) {
+    function getModules() {
+        let urlTest = baseURL + "/module/id?sessionid=" + localStorage.getItem("sessionid");
+
+        fetch(urlTest).then(response => response.json()).then(m => {
+            setEntries(m);
+            let args = "";
+            for (let i = 0; i < m.length; i++) {
+                args += m[i].semesterid;
+
+                if (i < m.length - 1) {
+                    args += "a";
+                }
+            }
+
+            let temp = []
+            let semesterURL = baseURL + "/semester/id/all?ids=" + args + "&sessionid=" + localStorage.getItem("sessionid");
+            fetch(semesterURL).then(r => r.json()).then(sem => {
+                sem.map(e => {
+                    temp.push(e.name)
+                })
+            }).then(() => setSemesterNames(temp))
+        })
+
+    }
+
+    function onClickSemester(e, m) {
+        if (e.activated == 1) {
+            if (m.target === m.currentTarget) {
+                localStorage.setItem("currentsid", e.semesterid)
+                localStorage.setItem("currentmodulename", e.name)
+                localStorage.setItem("moduleid", e.id)
+                router.push("/planning")
+            }
+        }
+    }
+
+
+    useEffect(() => {
+        getModules();
+    }, [])
+
+    const [entries, setEntries] = useState([]);
+    const [semesterNames, setSemesterNames] = useState([]);
+    const router = useRouter();
+
+
+    return (
+        <div className={"semester-overview"}>
+            <Logout/>
+            <Background/>
+            <HelpButton/>
+            {entries.map((e, index) => (
+                <div className={"semester-tile box-shadow"} style={{
+                    backgroundColor: e.activated == 1 ? "#ffffff" : "#aaaaaa"
+                }} onClick={(f) => onClickSemester(e, f)}>
+                    <SemesterTile
+                        editable={false} text={semesterNames[index]} text2={e.name}
+                        onClick={(f) => onClickSemester(e, f)}
+                    />
+                    <StatusBar progress={0}/>
+                </div>
+            ))}
+        </div>
+    );
+}

anwendung/src/pages/submit.js

@@ -0,0 +1,19 @@
+import Logout from "@/components/Logout";
+import SubmitWarning from "@/components/SubmitWarning";
+import Back from "@/components/Back";
+import {useRouter} from "next/router";
+import Background from "@/components/Background";
+
+export default function Submit(){
+
+    const router = useRouter();
+
+    return(
+        <div>
+            <Background />
+            <Logout />
+            <SubmitWarning onClick={() => router.back()}/>
+            <Back onClick={() => router.back()}/>
+        </div>
+    )
+}

anwendung/src/styles/calendarSideBar.css

@@ -0,0 +1,63 @@
+.A
+{
+    border: 0px solid;
+    border-radius: 20px;
+    margin: 10px;
+    background-color: white;
+    padding: 15px;
+    height: 270px;
+}
+
+.A P
+{
+    text-align: center;
+}
+
+.Days
+{
+    display: inline-grid;
+    grid-template-columns: repeat(7, 1fr);
+    grid-template-rows: repeat(5, 1fr);
+    height: 200px;
+    width: 250px;
+}
+
+.Down
+{
+    border-radius: 20px;
+    display: inline-grid;
+    grid-column: auto;
+    height: 200%;
+    width: 20%;
+}
+
+@media only screen and  (min-width: 1650px)
+{
+    .Allround
+    {
+        position: relative;
+        max-height : 73vh;
+        overflow-y: scroll;
+        overflow-anchor: none;
+    }
+
+    .Allround::-webkit-scrollbar
+    {
+        background-color: rgba(0, 0, 0, 0);
+        width: 12px;
+    }
+    .Allround::-webkit-scrollbar-thumb
+    {
+        background-color: gray;
+        border-radius: 15px;
+    }
+
+}
+
+@media only screen and (max-width: 1650px)
+{
+    .Allround
+    {
+        display: none;
+    }
+}

anwendung/src/styles/globals.css

@@ -0,0 +1,533 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+:root {
+    --foreground-rgb: 0, 0, 0;
+    --background-start-rgb: 255, 255, 255;
+    --background-end-rgb: 255, 255, 255;
+}
+
+body {
+    background-color: #f2f2f2;
+
+}
+
+::-webkit-scrollbar
+{
+    background-color: rgba(0, 0, 0, 0);
+    width: 12px;
+}
+::-webkit-scrollbar-thumb
+{
+    background-color: gray;
+    border-radius: 15px;
+
+}
+
+.splash {
+    position: absolute;
+    border-radius: 70px;
+    background-color: #c77c0c;
+
+    z-index: -5;
+
+}
+
+
+
+/**
+Page Layouts
+ */
+
+.normal-centered {
+    height: 100vh;
+    display: flex;
+    flex-direction: column;
+    justify-content: center;
+    align-items: center;
+}
+
+.semester-overview {
+    height: 100vh;
+    display: flex;
+    flex-direction: row;
+    justify-content: center;
+    align-items: center;
+    flex-wrap: wrap;
+    align-content: center;
+    gap: 10px;
+}
+
+body {
+    height: 100vh;
+}
+
+.box-shadow
+{
+    box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
+}
+
+.box-shadow-heavy
+{
+    box-shadow: 0 0 10px rgba(0, 0, 0,1);
+}
+
+/*
+Input Form
+ */
+
+.input-form
+{
+    width: 600px;
+    background-color: white;
+    padding: 30px;
+
+    display: flex;
+    flex-direction: column;
+    justify-content: space-around;
+    align-items: flex-start;
+    gap: 20px;
+}
+
+
+table
+{
+    width: 550px;
+}
+
+.table-wrapper
+{
+    max-height: 40%;
+    overflow-y: scroll;
+}
+
+td
+{
+    text-align: center;
+}
+
+.input-form p, .input-form th
+{
+    font-size: 18px;
+    font-weight: bold;
+    color: #5e5e5e;
+}
+
+
+/*
+Button
+ */
+.round-border {
+    border-radius: 10px;
+    border-width: 0;
+}
+
+.font-small {
+    font-size: 12px;
+}
+
+.font-middle {
+    font-size: 16px;
+}
+
+.font-big {
+    font-size: 22px;
+}
+
+.button {
+    background-color: #363636;
+    padding: 5px;
+    color: white;
+}
+
+.button:hover
+{
+    filter: brightness(0.65);
+}
+
+.button:hover {
+    background-color: #585858;
+}
+
+/*
+Step Progress Bar
+ */
+
+.step-container {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    max-width: 400px;
+    pointer-events: none;
+}
+
+.steps {
+    display: flex;
+    flex-direction: row;
+    align-items: center;
+    justify-content: space-between;
+    gap: 20px;
+    width: 100%;
+    position: relative;
+    pointer-events: none;
+}
+
+.step {
+    width: 40px;
+    height: 40px;
+    border-radius: 50%;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    color: white;
+    font-weight: bold;
+    pointer-events: none;
+}
+
+.steps .not-started {
+    /*background-image: linear-gradient(#b42121, #b44821);*/
+    background-color: #77932b;
+
+}
+
+.steps .started {
+    /*background-image: linear-gradient(#c75c0c, #c77c0c);*/
+    background-color: #77932b;
+}
+
+
+.steps .finished {
+    /*background-image: linear-gradient(#43C20BFF, #0bc27c);*/
+    background-color: #77932b;
+}
+
+
+.steps .active {
+    /*border-width: 2px;*/
+    /*border-color: #1e2428;*/
+    background-color: #346991;
+}
+
+.progress-bar {
+    position: absolute;
+    height: 8px;
+    background-color: #5d606e;
+    z-index: -1;
+}
+
+/*
+weekSelector
+*/
+
+.dateElement {
+    display: flex;
+    max-width: 900px;
+    width: 900px;
+    margin-left: 20px;
+    margin-right: 20px;
+    align-items: center;
+    justify-content: center;
+    font-weight: bold;
+    color: black;
+    font-size: 20px;
+}
+
+.weekSelector {
+    height: 13vh;
+    display: flex;
+    padding: 5px 5px;
+    background-color: rgba(0, 0, 0, 0);
+    border-radius: 10px;
+}
+
+/*
+Popup
+ */
+
+.modal-container {
+    z-index: 1;
+    position: fixed;
+    width: 100%;
+    height: 100%;
+    top: 0;
+    left: 0;
+    display: flex;
+    flex-direction: row;
+    justify-content: center;
+    align-items: center;
+    background-color: rgba(0, 0, 0, 0.5);
+}
+
+.modal {
+    height: 180px;
+    width: 300px;
+    border-radius: 10px;
+    background-color: rgb(255, 255, 255);
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: space-between;
+    padding: 20px;
+    animation-name: modalgrow;
+    animation-duration: 0.2s;
+    animation-play-state: running;
+}
+
+@keyframes modalgrow {
+    from
+    {
+        height: 90px;
+        width: 150px;
+    }
+    to
+    {
+        height: 180px;
+        width: 300px;
+    }
+}
+
+.modal p {
+    text-align: center;
+    pointer-events: none;
+    font-weight: bold;
+    font-size: 20px;
+}
+
+.modal div {
+    display: flex;
+    flex-direction: row;
+    width: 100%;
+    justify-content: flex-end;
+    gap: 5px;
+}
+
+/*
+Calender View
+ */
+
+@media (max-width: 1300px) {
+    .error-bar
+    {
+        display: none;
+    }
+}
+
+@media (min-width: 1300px) {
+    .error-bar
+    {
+        width: 250px;
+        border-radius: 15px;
+        height: 73vh;
+        max-height: 73vh;
+        overflow-y: scroll;
+        display: flex;
+        flex-direction: column;
+        justify-content: flex-start;
+        align-items: center;
+        gap: 10px;
+    }
+}
+
+.calender-direction-wrapper
+{
+    display: flex;
+    flex-direction: row;
+    justify-content: center;
+    align-items: center;
+}
+
+
+.calender-container {
+    position: relative;
+    max-height: 60vh;
+    overflow-y: scroll;
+    overflow-anchor: none;
+    display: grid;
+}
+
+
+.content {
+    grid-area: 1 / 1;
+}
+
+.overlay {
+    padding: 2px 0 0 0;
+    grid-area: 1 / 1;
+    pointer-events: none;
+}
+
+.no-pointer-events {
+    pointer-events: none;
+}
+
+.wochen-tag-container {
+    display: flex;
+    flex-direction: row;
+    justify-content: space-between;
+    height: 60px;
+    width: 1000px;
+    gap: 5px;
+    padding: 0 0 5px 0;
+}
+
+.calender-view {
+    width: 1000px;
+    height: 2400px;
+    display: flex;
+    flex-direction: row;
+    align-items: stretch;
+    justify-content: stretch;
+    gap: 5px;
+    user-select: none;
+    padding: 0;
+}
+
+.calender-view .spalte {
+    border-radius: 10px;
+    width: 400px;
+    /*background-color: #ffffff;*/
+    display: grid;
+    padding: 0 3px;
+    grid-template-columns: 100%;
+    background-color: white;
+}
+
+.wochen-tag-container .wochen-tag {
+    text-align: center;
+    background-color: #346991;
+    width: 400px;
+    color: white;
+    border-radius: 10px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+
+    grid-row-start: 1;
+    grid-row-end: 4;
+}
+
+.entry {
+    border-radius: 10px;
+    display: flex;
+    flex-direction: column;
+    justify-content: space-between;
+    padding: 0 2px;
+    align-items: center;
+    /*cursor: move;*/
+    z-index: 10;
+    overflow: hidden;
+    margin-top: 1px;
+    margin-bottom: 1px;
+}
+
+.entry .resize-grab {
+    height: 6px;
+    cursor: ns-resize;
+    width: 100%;
+}
+
+
+.entry p {
+    color: white;
+    font-size: 16px;
+    cursor: default;
+    pointer-events: none;
+    text-align: center;
+}
+
+/*
+Login
+ */
+
+.login-container {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: space-evenly;
+    /*gap: 10px;*/
+    border-radius: 10px;
+    background-color: rgba(255, 255, 255, 0.5);
+    width: 375px;
+    height: 350px;
+}
+
+
+.input-bordered {
+    border: none;
+    border-radius: 5px;
+}
+
+.input {
+    padding: 5px;
+    border: none;
+    background-color: white;
+    border-radius: 5px;
+    font-size: 16px;
+}
+
+.input:focus
+{
+    outline: none;
+}
+
+
+.placement {
+    display: flex;
+    flex-direction: column;
+    align-items: flex-start;
+    justify-content: left;
+}
+
+.font-kinda-big {
+    font-size: 18px;
+    color: #777777;
+    font-weight: 500;
+}
+
+.font-big-fat {
+    font-size: 22px;
+    font-weight: bold;
+}
+
+.input-sm {
+    height: 2rem /* 32px */;
+    padding-left: 0.75rem /* 12px */;
+    padding-right: 0.75rem /* 12px */;
+    font-size: 0.875rem /* 14px */;
+    line-height: 2rem /* 32px */;
+}
+
+/**
+SemesterTile
+ */
+
+.semester-tile {
+    width: 240px;
+    height: 160px;
+    color: black;
+    border-radius: 10px;
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    font-size: 20px;
+    gap: 10px;
+    background-color: white;
+}
+
+.semester-tile:hover {
+    background-color: #e1e1e1;
+}
+
+.semester-tile-p {
+    pointer-events: none;
+    font-weight: bold;
+    font-size: 23px;
+}
+
+
+.Error
+{
+
+}

anwendung/src/styles/helppage.css

@@ -0,0 +1,31 @@
+.help-line
+{
+    padding: 30px;
+    display: flex;
+    flex-direction: row;
+    justify-content: center;
+    align-items: center;
+    gap: 50px;
+}
+.text-form
+{
+    display: flex;
+    flex-direction: column;
+    justify-content: flex-start;
+    height: 100%;
+
+}
+
+.text-form h1
+{
+    font-size: 30px;
+}
+.text-form p
+{
+    font-size: 20px;
+}
+
+.text-form h2
+{
+    font-size: 26px;
+}

anwendung/tailwind.config.js

@@ -0,0 +1,17 @@
+/** @type {import('tailwindcss').Config} */
+module.exports = {
+  content: [
+    './src/pages/**/*.{js,ts,jsx,tsx,mdx}',
+    './src/components/**/*.{js,ts,jsx,tsx,mdx}',
+    './src/app/**/*.{js,ts,jsx,tsx,mdx}',
+  ],
+  theme: {
+    extend: {
+      backgroundImage: {
+        'gradient-radial': 'radial-gradient(var(--tw-gradient-stops))',
+        'gradient-conic':
+          'conic-gradient(from 180deg at 50% 50%, var(--tw-gradient-stops))',
+      },
+    },
+  },
+}

backend/.gitignore

@@ -0,0 +1,33 @@
+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

backend/.mvn/wrapper/maven-wrapper.properties

@@ -0,0 +1,18 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.8.7/apache-maven-3.8.7-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.1/maven-wrapper-3.1.1.jar

backend/mvnw

@@ -0,0 +1,316 @@
+#!/bin/sh
+# ----------------------------------------------------------------------------
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#    https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# ----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
+# Maven Start Up Batch script
+#
+# Required ENV vars:
+# ------------------
+#   JAVA_HOME - location of a JDK home dir
+#
+# Optional ENV vars
+# -----------------
+#   M2_HOME - location of maven2's installed home dir
+#   MAVEN_OPTS - parameters passed to the Java VM when running Maven
+#     e.g. to debug Maven itself, use
+#       set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+#   MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+# ----------------------------------------------------------------------------
+
+if [ -z "$MAVEN_SKIP_RC" ] ; then
+
+  if [ -f /usr/local/etc/mavenrc ] ; then
+    . /usr/local/etc/mavenrc
+  fi
+
+  if [ -f /etc/mavenrc ] ; then
+    . /etc/mavenrc
+  fi
+
+  if [ -f "$HOME/.mavenrc" ] ; then
+    . "$HOME/.mavenrc"
+  fi
+
+fi
+
+# OS specific support.  $var _must_ be set to either true or false.
+cygwin=false;
+darwin=false;
+mingw=false
+case "`uname`" in
+  CYGWIN*) cygwin=true ;;
+  MINGW*) mingw=true;;
+  Darwin*) darwin=true
+    # Use /usr/libexec/java_home if available, otherwise fall back to /Library/Java/Home
+    # See https://developer.apple.com/library/mac/qa/qa1170/_index.html
+    if [ -z "$JAVA_HOME" ]; then
+      if [ -x "/usr/libexec/java_home" ]; then
+        export JAVA_HOME="`/usr/libexec/java_home`"
+      else
+        export JAVA_HOME="/Library/Java/Home"
+      fi
+    fi
+    ;;
+esac
+
+if [ -z "$JAVA_HOME" ] ; then
+  if [ -r /etc/gentoo-release ] ; then
+    JAVA_HOME=`java-config --jre-home`
+  fi
+fi
+
+if [ -z "$M2_HOME" ] ; then
+  ## resolve links - $0 may be a link to maven's home
+  PRG="$0"
+
+  # need this for relative symlinks
+  while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+      PRG="$link"
+    else
+      PRG="`dirname "$PRG"`/$link"
+    fi
+  done
+
+  saveddir=`pwd`
+
+  M2_HOME=`dirname "$PRG"`/..
+
+  # make it fully qualified
+  M2_HOME=`cd "$M2_HOME" && pwd`
+
+  cd "$saveddir"
+  # echo Using m2 at $M2_HOME
+fi
+
+# For Cygwin, ensure paths are in UNIX format before anything is touched
+if $cygwin ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --unix "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --unix "$CLASSPATH"`
+fi
+
+# For Mingw, ensure paths are in UNIX format before anything is touched
+if $mingw ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME="`(cd "$M2_HOME"; pwd)`"
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`"
+fi
+
+if [ -z "$JAVA_HOME" ]; then
+  javaExecutable="`which javac`"
+  if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then
+    # readlink(1) is not available as standard on Solaris 10.
+    readLink=`which readlink`
+    if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then
+      if $darwin ; then
+        javaHome="`dirname \"$javaExecutable\"`"
+        javaExecutable="`cd \"$javaHome\" && pwd -P`/javac"
+      else
+        javaExecutable="`readlink -f \"$javaExecutable\"`"
+      fi
+      javaHome="`dirname \"$javaExecutable\"`"
+      javaHome=`expr "$javaHome" : '\(.*\)/bin'`
+      JAVA_HOME="$javaHome"
+      export JAVA_HOME
+    fi
+  fi
+fi
+
+if [ -z "$JAVACMD" ] ; then
+  if [ -n "$JAVA_HOME"  ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+      # IBM's JDK on AIX uses strange locations for the executables
+      JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+      JAVACMD="$JAVA_HOME/bin/java"
+    fi
+  else
+    JAVACMD="`\\unset -f command; \\command -v java`"
+  fi
+fi
+
+if [ ! -x "$JAVACMD" ] ; then
+  echo "Error: JAVA_HOME is not defined correctly." >&2
+  echo "  We cannot execute $JAVACMD" >&2
+  exit 1
+fi
+
+if [ -z "$JAVA_HOME" ] ; then
+  echo "Warning: JAVA_HOME environment variable is not set."
+fi
+
+CLASSWORLDS_LAUNCHER=org.codehaus.plexus.classworlds.launcher.Launcher
+
+# traverses directory structure from process work directory to filesystem root
+# first directory with .mvn subdirectory is considered project base directory
+find_maven_basedir() {
+
+  if [ -z "$1" ]
+  then
+    echo "Path not specified to find_maven_basedir"
+    return 1
+  fi
+
+  basedir="$1"
+  wdir="$1"
+  while [ "$wdir" != '/' ] ; do
+    if [ -d "$wdir"/.mvn ] ; then
+      basedir=$wdir
+      break
+    fi
+    # workaround for JBEAP-8937 (on Solaris 10/Sparc)
+    if [ -d "${wdir}" ]; then
+      wdir=`cd "$wdir/.."; pwd`
+    fi
+    # end of workaround
+  done
+  echo "${basedir}"
+}
+
+# concatenates all lines of a file
+concat_lines() {
+  if [ -f "$1" ]; then
+    echo "$(tr -s '\n' ' ' < "$1")"
+  fi
+}
+
+BASE_DIR=`find_maven_basedir "$(pwd)"`
+if [ -z "$BASE_DIR" ]; then
+  exit 1;
+fi
+
+##########################################################################################
+# Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+# This allows using the maven wrapper in projects that prohibit checking in binary data.
+##########################################################################################
+if [ -r "$BASE_DIR/.mvn/wrapper/maven-wrapper.jar" ]; then
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Found .mvn/wrapper/maven-wrapper.jar"
+    fi
+else
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Couldn't find .mvn/wrapper/maven-wrapper.jar, downloading it ..."
+    fi
+    if [ -n "$MVNW_REPOURL" ]; then
+      jarUrl="$MVNW_REPOURL/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+    else
+      jarUrl="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+    fi
+    while IFS="=" read key value; do
+      case "$key" in (wrapperUrl) jarUrl="$value"; break ;;
+      esac
+    done < "$BASE_DIR/.mvn/wrapper/maven-wrapper.properties"
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Downloading from: $jarUrl"
+    fi
+    wrapperJarPath="$BASE_DIR/.mvn/wrapper/maven-wrapper.jar"
+    if $cygwin; then
+      wrapperJarPath=`cygpath --path --windows "$wrapperJarPath"`
+    fi
+
+    if command -v wget > /dev/null; then
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Found wget ... using wget"
+        fi
+        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+            wget "$jarUrl" -O "$wrapperJarPath" || rm -f "$wrapperJarPath"
+        else
+            wget --http-user=$MVNW_USERNAME --http-password=$MVNW_PASSWORD "$jarUrl" -O "$wrapperJarPath" || rm -f "$wrapperJarPath"
+        fi
+    elif command -v curl > /dev/null; then
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Found curl ... using curl"
+        fi
+        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+            curl -o "$wrapperJarPath" "$jarUrl" -f
+        else
+            curl --user $MVNW_USERNAME:$MVNW_PASSWORD -o "$wrapperJarPath" "$jarUrl" -f
+        fi
+
+    else
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Falling back to using Java to download"
+        fi
+        javaClass="$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.java"
+        # For Cygwin, switch paths to Windows format before running javac
+        if $cygwin; then
+          javaClass=`cygpath --path --windows "$javaClass"`
+        fi
+        if [ -e "$javaClass" ]; then
+            if [ ! -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+                if [ "$MVNW_VERBOSE" = true ]; then
+                  echo " - Compiling MavenWrapperDownloader.java ..."
+                fi
+                # Compiling the Java class
+                ("$JAVA_HOME/bin/javac" "$javaClass")
+            fi
+            if [ -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+                # Running the downloader
+                if [ "$MVNW_VERBOSE" = true ]; then
+                  echo " - Running MavenWrapperDownloader.java ..."
+                fi
+                ("$JAVA_HOME/bin/java" -cp .mvn/wrapper MavenWrapperDownloader "$MAVEN_PROJECTBASEDIR")
+            fi
+        fi
+    fi
+fi
+##########################################################################################
+# End of extension
+##########################################################################################
+
+export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"}
+if [ "$MVNW_VERBOSE" = true ]; then
+  echo $MAVEN_PROJECTBASEDIR
+fi
+MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS"
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --path --windows "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --windows "$CLASSPATH"`
+  [ -n "$MAVEN_PROJECTBASEDIR" ] &&
+    MAVEN_PROJECTBASEDIR=`cygpath --path --windows "$MAVEN_PROJECTBASEDIR"`
+fi
+
+# Provide a "standardized" way to retrieve the CLI args that will
+# work with both Windows and non-Windows executions.
+MAVEN_CMD_LINE_ARGS="$MAVEN_CONFIG $@"
+export MAVEN_CMD_LINE_ARGS
+
+WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+exec "$JAVACMD" \
+  $MAVEN_OPTS \
+  $MAVEN_DEBUG_OPTS \
+  -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \
+  "-Dmaven.home=${M2_HOME}" \
+  "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
+  ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@"

backend/mvnw.cmd

@@ -0,0 +1,188 @@
+@REM ----------------------------------------------------------------------------
+@REM Licensed to the Apache Software Foundation (ASF) under one
+@REM or more contributor license agreements.  See the NOTICE file
+@REM distributed with this work for additional information
+@REM regarding copyright ownership.  The ASF licenses this file
+@REM to you under the Apache License, Version 2.0 (the
+@REM "License"); you may not use this file except in compliance
+@REM with the License.  You may obtain a copy of the License at
+@REM
+@REM    https://www.apache.org/licenses/LICENSE-2.0
+@REM
+@REM Unless required by applicable law or agreed to in writing,
+@REM software distributed under the License is distributed on an
+@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+@REM KIND, either express or implied.  See the License for the
+@REM specific language governing permissions and limitations
+@REM under the License.
+@REM ----------------------------------------------------------------------------
+
+@REM ----------------------------------------------------------------------------
+@REM Maven Start Up Batch script
+@REM
+@REM Required ENV vars:
+@REM JAVA_HOME - location of a JDK home dir
+@REM
+@REM Optional ENV vars
+@REM M2_HOME - location of maven2's installed home dir
+@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
+@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a keystroke before ending
+@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
+@REM     e.g. to debug Maven itself, use
+@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+@REM ----------------------------------------------------------------------------
+
+@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
+@echo off
+@REM set title of command window
+title %0
+@REM enable echoing by setting MAVEN_BATCH_ECHO to 'on'
+@if "%MAVEN_BATCH_ECHO%" == "on"  echo %MAVEN_BATCH_ECHO%
+
+@REM set %HOME% to equivalent of $HOME
+if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
+
+@REM Execute a user defined script before this one
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
+@REM check for pre script, once with legacy .bat ending and once with .cmd ending
+if exist "%USERPROFILE%\mavenrc_pre.bat" call "%USERPROFILE%\mavenrc_pre.bat" %*
+if exist "%USERPROFILE%\mavenrc_pre.cmd" call "%USERPROFILE%\mavenrc_pre.cmd" %*
+:skipRcPre
+
+@setlocal
+
+set ERROR_CODE=0
+
+@REM To isolate internal variables from possible post scripts, we use another setlocal
+@setlocal
+
+@REM ==== START VALIDATION ====
+if not "%JAVA_HOME%" == "" goto OkJHome
+
+echo.
+echo Error: JAVA_HOME not found in your environment. >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+:OkJHome
+if exist "%JAVA_HOME%\bin\java.exe" goto init
+
+echo.
+echo Error: JAVA_HOME is set to an invalid directory. >&2
+echo JAVA_HOME = "%JAVA_HOME%" >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+@REM ==== END VALIDATION ====
+
+:init
+
+@REM Find the project base dir, i.e. the directory that contains the folder ".mvn".
+@REM Fallback to current working directory if not found.
+
+set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
+IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
+
+set EXEC_DIR=%CD%
+set WDIR=%EXEC_DIR%
+:findBaseDir
+IF EXIST "%WDIR%"\.mvn goto baseDirFound
+cd ..
+IF "%WDIR%"=="%CD%" goto baseDirNotFound
+set WDIR=%CD%
+goto findBaseDir
+
+:baseDirFound
+set MAVEN_PROJECTBASEDIR=%WDIR%
+cd "%EXEC_DIR%"
+goto endDetectBaseDir
+
+:baseDirNotFound
+set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
+cd "%EXEC_DIR%"
+
+:endDetectBaseDir
+
+IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig
+
+@setlocal EnableExtensions EnableDelayedExpansion
+for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
+@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
+
+:endReadAdditionalConfig
+
+SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
+set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar"
+set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+set DOWNLOAD_URL="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+
+FOR /F "usebackq tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO (
+    IF "%%A"=="wrapperUrl" SET DOWNLOAD_URL=%%B
+)
+
+@REM Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+@REM This allows using the maven wrapper in projects that prohibit checking in binary data.
+if exist %WRAPPER_JAR% (
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Found %WRAPPER_JAR%
+    )
+) else (
+    if not "%MVNW_REPOURL%" == "" (
+        SET DOWNLOAD_URL="%MVNW_REPOURL%/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+    )
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Couldn't find %WRAPPER_JAR%, downloading it ...
+        echo Downloading from: %DOWNLOAD_URL%
+    )
+
+    powershell -Command "&{"^
+		"$webclient = new-object System.Net.WebClient;"^
+		"if (-not ([string]::IsNullOrEmpty('%MVNW_USERNAME%') -and [string]::IsNullOrEmpty('%MVNW_PASSWORD%'))) {"^
+		"$webclient.Credentials = new-object System.Net.NetworkCredential('%MVNW_USERNAME%', '%MVNW_PASSWORD%');"^
+		"}"^
+		"[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; $webclient.DownloadFile('%DOWNLOAD_URL%', '%WRAPPER_JAR%')"^
+		"}"
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Finished downloading %WRAPPER_JAR%
+    )
+)
+@REM End of extension
+
+@REM Provide a "standardized" way to retrieve the CLI args that will
+@REM work with both Windows and non-Windows executions.
+set MAVEN_CMD_LINE_ARGS=%*
+
+%MAVEN_JAVA_EXE% ^
+  %JVM_CONFIG_MAVEN_PROPS% ^
+  %MAVEN_OPTS% ^
+  %MAVEN_DEBUG_OPTS% ^
+  -classpath %WRAPPER_JAR% ^
+  "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" ^
+  %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %*
+if ERRORLEVEL 1 goto error
+goto end
+
+:error
+set ERROR_CODE=1
+
+:end
+@endlocal & set ERROR_CODE=%ERROR_CODE%
+
+if not "%MAVEN_SKIP_RC%"=="" goto skipRcPost
+@REM check for post script, once with legacy .bat ending and once with .cmd ending
+if exist "%USERPROFILE%\mavenrc_post.bat" call "%USERPROFILE%\mavenrc_post.bat"
+if exist "%USERPROFILE%\mavenrc_post.cmd" call "%USERPROFILE%\mavenrc_post.cmd"
+:skipRcPost
+
+@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
+if "%MAVEN_BATCH_PAUSE%"=="on" pause
+
+if "%MAVEN_TERMINATE_CMD%"=="on" exit %ERROR_CODE%
+
+cmd /C exit /B %ERROR_CODE%

backend/pom.xml

@@ -0,0 +1,68 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>3.0.6</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+    <groupId>com.example</groupId>
+    <artifactId>backend</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>backend</name>
+    <description>backend</description>
+    <properties>
+        <java.version>17</java.version>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <version>2.1.214</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-install-plugin</artifactId>
+                <version>2.5.2</version>
+                <executions>
+                    <execution>
+                        <phase>validate</phase>
+                        <goals>
+                            <goal>install-file</goal>
+                        </goals>
+                        <configuration>
+                            <groupId>com.example</groupId>
+                            <artifactId>example</artifactId>
+                            <version>1.0</version>
+                            <packaging>jar</packaging>
+                            <file>${basedir}/H2JDBCDriver/h2-2.1.214.jar</file>
+                            <generatePom>true</generatePom>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

backend/src/main/java/com/example/backend/BackendApplication.java

@@ -0,0 +1,15 @@
+package com.example.backend;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class BackendApplication
+{
+
+    public static void main(String[] args)
+    {
+        SpringApplication.run(BackendApplication.class, args);
+    }
+
+}

backend/src/main/java/com/example/backend/anwprj/Database/DataBaseHandler.java

@@ -0,0 +1,517 @@
+package com.example.backend.anwprj.Database;
+
+import com.example.backend.discard.Encryption.RSA;
+import com.example.backend.anwprj.Entries.Entry;
+import com.example.backend.anwprj.Semesters.Semester;
+import com.example.backend.anwprj.Users.User;
+import com.example.backend.anwprj.Module.Module;
+
+import java.sql.*;
+import java.util.ArrayList;
+import java.util.List;
+
+public class DataBaseHandler {
+    //singleton instance of database handler
+    private static DataBaseHandler instance = null;
+
+    public static DataBaseHandler getInstance() {
+        if (instance == null) {
+            instance = new DataBaseHandler();
+        }
+
+        return instance;
+    }
+
+    //connection to the database
+    private Connection connection;
+    //sql statement
+    private Statement st;
+    private boolean encrypted = false;
+
+    public DataBaseHandler() {
+        try {
+            //connect to the local database
+            connection = DriverManager.getConnection("jdbc:h2:./database", "adm", "73bgjfdsfJ!934");
+            st = connection.createStatement();
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    }
+
+
+    /**
+     * ENTRIES
+     */
+    public void addEntry(Entry entry) {
+        try {
+            st.executeUpdate("insert into entries (daynumber, yearnumber, semesterid, usercreatedbyid, timestart, timeend, info) values (" +
+                    entry.getDaynumber() + ", " + entry.getYearnumber() + ", " + entry.getSemesterid() + ", " +
+                    entry.getUsercreatedbyid() + ", " + entry.getTimestart() + ", " + entry.getTimeend() + ", '" + entry.getInfo() + "')"
+            );
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    public Entry[][] getEntries(int semesterid, int daynumber, int yearnumber) {
+        try {
+            ResultSet rs = st.executeQuery("select * from entries where " +
+                    "semesterid=" + semesterid +
+                    " and yearnumber=" + yearnumber +
+                    " and daynumber between " + daynumber + " and " + daynumber + 6);
+
+            List<Entry> entryList = new ArrayList<>();
+            Entry current = null;
+            while ((current = resultSetToEntry(rs)) != null) {
+                entryList.add(current);
+            }
+
+            Entry[][] entries = new Entry[6][20];
+            for (int i = 0; i < 6; i++) {
+                int f = 0;
+
+                for (int j = 0; j < entryList.size(); j++) {
+                    if (entryList.get(j).getDaynumber() == i + daynumber) {
+                        entries[i][f] = entryList.get(j);
+                        f++;
+                    }
+                }
+            }
+
+            return entries;
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+
+    public Entry[][] getAllEntrys(int semesterid, int daynumber, int yearnumber, int userid) {
+        try {
+            ResultSet rs = st.executeQuery("select * from entries where " +
+                    "semesterid<>" + semesterid +
+                    " and yearnumber=" + yearnumber +
+                    " and usercreatedbyid=" + userid +
+                    " and daynumber between " + daynumber + " and " + daynumber + 6);
+            List<Entry> entryList = new ArrayList<>();
+            Entry current = null;
+            while ((current = resultSetToEntry(rs)) != null) {
+                entryList.add(current);
+            }
+            Entry[][] entries = new Entry[6][20];
+            for (int i = 0; i < 6; i++) {
+                int f = 0;
+
+                for (int j = 0; j < entryList.size(); j++) {
+                    if (entryList.get(j).getDaynumber() == i + daynumber) {
+                        entries[i][f] = entryList.get(j);
+                        f++;
+                    }
+                }
+            }
+            return entries;
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    public Entry[] getAllEntries(int semesterid, int userid) {
+        try {
+            ResultSet rs = st.executeQuery("select * from entries where " +
+                    "semesterid=" + semesterid +
+                    " and usercreatedbyid=" + userid);
+            List<Entry> entriestate = new ArrayList<>();
+            Entry current = null;
+            while ((current = resultSetToEntry(rs)) != null) {
+                entriestate.add(current);
+            }
+            return entriestate.toArray(new Entry[0]);
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    public void deleteEntry(int id) {
+        try {
+            st.executeUpdate("delete from entries where id=" + id);
+        } catch (Exception e) {
+
+        }
+    }
+
+    public void updateEntry(Entry entry) {
+        try {
+            st.executeUpdate("update entries set timeend=" + entry.getTimeend() + ", timestart=" + entry.getTimestart() + " where id=" + entry.getId());
+        } catch (Exception e) {
+
+        }
+    }
+
+    public Entry resultSetToEntry(ResultSet rs) {
+        try {
+            rs.next();
+            return new Entry(
+                    rs.getInt("id"),
+                    rs.getInt("daynumber"),
+                    rs.getInt("yearnumber"),
+                    rs.getInt("usercreatedbyid"),
+                    rs.getInt("timestart"),
+                    rs.getInt("timeend"),
+                    rs.getInt("semesterid"),
+                    rs.getString("info")
+            );
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+
+    /**
+     * SEMESTER
+     */
+    //get a semester object by its name
+    public Semester getSemester(String name) {
+        try {
+            ResultSet rs = st.executeQuery("select * from SEMESTER where name = '" + name + "'");
+            return resultSetToSemester(rs);
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    public Semester getSemester(int id) {
+        try {
+            ResultSet rs = st.executeQuery("select * from semester where id=" + id);
+            return resultSetToSemester(rs);
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    //write a new semester to the database returns if process was successful
+    public Semester addSemester(Semester s) {
+        try {
+            st.executeUpdate("insert into SEMESTER (startday, endday, name, startyear, endyear, number) values (" + s.getStartday() + ", " + s.getEndday() + ", '" + s.getName() + "', " + s.getStartyear() + ", " + s.getEndyear() + ", " + s.getNumber() + ")");
+            return getSemester(s.getName());
+
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    public Semester[] getAllSemesters() {
+        try {
+            ResultSet rs = st.executeQuery("select * from semester");
+            List<Semester> semestersList = new ArrayList<>();
+            Semester s = null;
+            while ((s = resultSetToSemester(rs)) != null) {
+                semestersList.add(s);
+            }
+
+            return semestersList.toArray(new Semester[0]);
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    public Semester updateSemester(Semester semester) {
+        try {
+            st.executeUpdate("update semester set startday=" + semester.getStartday() + ", " +
+                    "endday=" + semester.getEndday() + ", " +
+                    "name='" + semester.getName() + "', " +
+                    "startyear=" + semester.getStartyear() + ", " +
+                    "number=" + semester.getNumber() + ", " +
+                    "endyear=" + semester.getEndyear() + " where id=" + semester.getId());
+
+            return getSemester(semester.getId());
+        } catch (SQLException e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    public void deleteSemester(int id) {
+        try {
+            st.executeUpdate("DELETE FROM modules WHERE semesterid=" + id);
+
+            st.executeUpdate("delete from semester where id=" + id);
+        } catch (Exception e) {
+
+        }
+    }
+
+    public Semester resultSetToSemester(ResultSet rs) {
+        try {
+            rs.next();
+            return new Semester(
+                    rs.getInt("id"),
+                    rs.getInt("startday"),
+                    rs.getInt("endday"),
+                    rs.getString("name"),
+                    rs.getInt("startyear"),
+                    rs.getInt("endyear"),
+                    rs.getInt("number")
+            );
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    /**
+     * MODULE
+     */
+
+    //get a module object by its id
+    public Module getModule(int id) {
+        try {
+            ResultSet rs = st.executeQuery("SELECT * FROM modules WHERE id=" + id);
+            return resultSetToModule(rs);
+        } catch (Exception ex) {
+            return null;
+        }
+    }
+
+    public Module getModule(int userid, int semesterid) {
+        try {
+            ResultSet rs = st.executeQuery("select * from modules where userid=" + userid + " and semesterid=" + semesterid);
+
+            return resultSetToModule(rs);
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    //get module objects by its semester and its lecturer
+    public Module[] getModules(int userid) {
+        try {
+            ResultSet rs = st.executeQuery("SELECT * FROM modules WHERE userid = " + userid);
+            List<Module> moduleList = new ArrayList<>();
+            Module m = null;
+            while ((m = resultSetToModule(rs)) != null) {
+                moduleList.add(m);
+            }
+
+            return moduleList.toArray(new Module[0]);
+
+        } catch (Exception ex) {
+            return null;
+        }
+    }
+
+    public Module addModule(Module m) {
+        try {
+            st.executeUpdate("insert into modules (userid, semesterid, name, activated) " +
+                    "Values (" + m.getUserid() + ", " + m.getsemesterid() + ", '" + m.getName() + "', " + m.getActivated() + ")");
+            return getModule(m.getUserid(), m.getsemesterid());
+
+        } catch (Exception e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    public Module[] getAllModules() {
+        try {
+            ResultSet rs = st.executeQuery("SELECT * FROM modules");
+            List<Module> moduleList = new ArrayList<>();
+            Module m = null;
+            while ((m = resultSetToModule(rs)) != null) {
+                moduleList.add(m);
+            }
+
+            return moduleList.toArray(new Module[0]);
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    public Module updateModule(Module m) {
+
+        try {
+
+
+            st.executeUpdate("update modules set activated=" + m.getActivated() + ", semesterid=" + m.getsemesterid() + ", name='" + m.getName() + "' where id=" + m.getid());
+
+
+            return null;
+        } catch (SQLException ex) {
+            ex.printStackTrace();
+            return null;
+        }
+    }
+
+    public boolean deleteModule(int id) {
+        try {
+            st.executeUpdate("delete from modules where id=" + id);
+            return true;
+        } catch (Exception ex) {
+            return false;
+        }
+    }
+
+    public Module resultSetToModule(ResultSet rs) {
+        try {
+            rs.next();
+            return new Module(
+                    rs.getInt("id"),
+                    rs.getInt("userid"),
+                    rs.getInt("semesterid"),
+                    rs.getString("name"),
+                    rs.getInt("activated"));
+        } catch (Exception ex) {
+            return null;
+        }
+    }
+
+    /**
+     * USER
+     */
+
+    //Alle User, die nicht admin sind
+    public User[] getAllUsers() {
+        try {
+            ResultSet rs = st.executeQuery("select * from users where permission=0");
+
+            User u = null;
+
+            List<User> output = new ArrayList<>();
+
+            while ((u = resultSetToUser(rs)) != null) {
+                u.clearOutPassword();
+                output.add(u);
+            }
+
+            return output.toArray(new User[0]);
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    //einen User
+    public User getUser(String mail, String password) {
+
+        try {
+            ResultSet rs = st.executeQuery("select * from users where mail = '" + mail + "' and password = '" + password + "'");
+            return resultSetToUser(rs);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+        return null;
+    }
+
+    public User getUser(int id) {
+        try {
+            ResultSet rs = st.executeQuery("select * from users where id=" + id);
+            return resultSetToUser(rs);
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    public User getUser(String mail) {
+        try {
+            ResultSet rs = st.executeQuery("select * from users where mail='" + mail + "'");
+            User u = resultSetToUser(rs);
+            if (u != null) u.clearOutPassword();
+
+            return u;
+        } catch (SQLException e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    public User resultSetToUser(ResultSet rs) {
+        try {
+            rs.next();
+            return new User(
+                    rs.getInt("id"),
+                    rs.getString("firstname"),
+                    rs.getString("lastname"),
+                    rs.getString("mail"),
+                    rs.getString("password"),
+                    rs.getInt("permission")
+            );
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    //add a new user object to the database returns if process was successful
+    public User addUser(User user) {
+        //check if mail and passwort (key user information) is given
+        if (user.getMail() == null || user.getPassword() == null) {
+            return null;
+        }
+
+        try {
+            String password = user.getPassword();
+            if (encrypted) {
+                RSA rsa = RSA.getInstance();
+                byte[] psw = rsa.loadByteArray(password);
+                try {
+                    password = rsa.decrypt(psw);
+                } catch (Exception e) {
+                    e.printStackTrace();
+                }
+            }
+            st.executeUpdate("insert into users (firstname, lastname, mail, password, permission) values (" + "'" + user.getFirstName() + "', '" + user.getLastName() + "', '" + user.getMail() + "', '" + password + "', " + 0 + ")");
+            return getUser(user.getMail(), user.getPassword());
+        } catch (Exception e) {
+            return null;
+        }
+
+    }
+
+    public User updateUser(User user, int id, boolean elevationRequestByAdmin) {
+        try {
+            String password = user.getPassword();
+            if (encrypted) {
+                RSA rsa = RSA.getInstance();
+                byte[] psw = rsa.loadByteArray(password);
+                try {
+                    password = rsa.decrypt(psw);
+                } catch (Exception e) {
+                    e.printStackTrace();
+                }
+            }
+
+            if (!elevationRequestByAdmin) {
+                st.executeUpdate("update users set " +
+                        "firstname='" + user.getFirstName() + "', " +
+                        "lastname='" + user.getLastName() + "', " +
+                        "mail='" + user.getMail() + "', " +
+                        "password='" + password + "' " +
+                        "where id=" + id);
+            } else {
+                st.executeUpdate("update users set " +
+                        "firstname='" + user.getFirstName() + "', " +
+                        "lastname='" + user.getLastName() + "', " +
+                        "mail='" + user.getMail() + "', " +
+                        "password='" + password + "'," +
+                        "permission=" + user.getPermissions() +
+                        "where id=" + id);
+            }
+
+            return getUser(id);
+        } catch (SQLException e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    public boolean deleteUser(String mail) {
+        try {
+            ResultSet rs = st.executeQuery("SELECT id FROM user WHERE mail='" + mail + "'");
+            rs.next();
+            int id = rs.getInt("id");
+            st.executeUpdate("DELETE FROM modules WHERE lecturerId = " + id);
+
+            st.executeUpdate("delete from users where mail='" + mail + "'");
+            return true;
+        } catch (Exception e) {
+            e.printStackTrace();
+            return false;
+        }
+    }
+}

backend/src/main/java/com/example/backend/anwprj/Entries/Entry.java

@@ -0,0 +1,66 @@
+package com.example.backend.anwprj.Entries;
+
+//entry data class
+public class Entry
+{
+    private int id;
+    private int daynumber;
+    private int yearnumber;
+    private int usercreatedbyid;
+    private int timestart;
+    private int timeend;
+    private int semesterid;
+    private String info;
+
+    public Entry(int id, int daynumber, int yearnumber, int usercreatedbyid, int timestart, int timeend, int semesterid, String info)
+    {
+        this.id = id;
+        this.daynumber = daynumber;
+        this.yearnumber = yearnumber;
+        this.usercreatedbyid = usercreatedbyid;
+        this.timestart = timestart;
+        this.timeend = timeend;
+        this.semesterid = semesterid;
+        this.info = info;
+    }
+
+    public int getId()
+    {
+        return id;
+    }
+
+    public int getDaynumber()
+    {
+        return daynumber;
+    }
+
+    public int getYearnumber()
+    {
+        return yearnumber;
+    }
+
+    public int getUsercreatedbyid()
+    {
+        return usercreatedbyid;
+    }
+
+    public int getTimestart()
+    {
+        return timestart;
+    }
+
+    public int getTimeend()
+    {
+        return timeend;
+    }
+
+    public int getSemesterid()
+    {
+        return semesterid;
+    }
+
+    public String getInfo()
+    {
+        return info;
+    }
+}

backend/src/main/java/com/example/backend/anwprj/Module/Module.java

@@ -0,0 +1,31 @@
+package com.example.backend.anwprj.Module;
+
+//module data class
+public class Module {
+    private int id;
+    private int userid;
+    private int semesterid;
+    private String name;
+    private int activated;
+
+
+    public Module(int id, int userid, int semesterid, String name, int activated)
+    {
+        this.id = id;
+        this.userid = userid;
+        this.semesterid = semesterid;
+        this.name = name;
+        this.activated = activated;
+    }
+
+    public int getid() { return id; }
+
+    public int getUserid() { return userid; }
+
+    public int getsemesterid() { return semesterid; }
+
+    public String getName() { return name; }
+
+    public int getActivated() { return activated; }
+
+}

backend/src/main/java/com/example/backend/anwprj/Semesters/Semester.java

@@ -0,0 +1,49 @@
+package com.example.backend.anwprj.Semesters;
+
+//semester data class
+public class Semester
+{
+    private int id;
+    private int startday;
+    private int endday;
+    private String name;
+    private int startyear;
+    private int endyear;
+    private int number;
+
+    public Semester(int id, int startday, int endday, String name, int startyear, int endyear, int number) {
+        this.id = id;
+        this.startday = startday;
+        this.endday = endday;
+        this.name = name;
+        this.startyear = startyear;
+        this.endyear = endyear;
+        this.number = number;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public int getStartday() {
+        return startday;
+    }
+
+    public int getEndday() {
+        return endday;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public int getStartyear() {
+        return startyear;
+    }
+
+    public int getEndyear() {
+        return endyear;
+    }
+
+    public int getNumber(){return number; }
+}

backend/src/main/java/com/example/backend/anwprj/Users/User.java

@@ -0,0 +1,57 @@
+package com.example.backend.anwprj.Users;
+
+//user data class
+public class User
+{
+    private int id;
+    private String firstName;
+    private String lastName;
+    private String mail;
+    private String password;
+    private int permissions;
+
+    public User(int id, String firstName, String lastName, String mail, String password, int permissions)
+    {
+        this.id = id;
+        this.firstName = firstName;
+        this.lastName = lastName;
+        this.mail = mail;
+        this.password = password;
+        this.permissions = permissions;
+    }
+
+    public int getId()
+    {
+        return id;
+    }
+
+    public String getFirstName()
+    {
+        return firstName;
+    }
+
+    public String getLastName()
+    {
+        return lastName;
+    }
+
+    public String getMail()
+    {
+        return mail;
+    }
+
+    public String getPassword()
+    {
+        return password;
+    }
+
+    public int getPermissions()
+    {
+        return permissions;
+    }
+
+    public void clearOutPassword()
+    {
+        password = "****";
+    }
+}

backend/src/main/java/com/example/backend/anwprj/Users/UserPermissions.java

@@ -0,0 +1,20 @@
+package com.example.backend.anwprj.Users;
+
+//mapping of the integer rights to enum
+public enum UserPermissions
+{
+    self(0),
+    admin(1);
+
+    private final int value;
+
+    public int getValue()
+    {
+        return value;
+    }
+
+    private UserPermissions(int value)
+    {
+        this.value = value;
+    }
+}

backend/src/main/java/com/example/backend/anwprj/Users/UserSessionIDHandler.java

@@ -0,0 +1,68 @@
+package com.example.backend.anwprj.Users;
+
+import com.example.backend.anwprj.Database.DataBaseHandler;
+
+import java.nio.charset.StandardCharsets;
+import java.util.HashMap;
+
+public class UserSessionIDHandler
+{
+    //stores mapping of session ids to users
+    public static HashMap<String, User> mapping = new HashMap<>();
+
+    //returns a user object by its session id (ONLY FOR SERVER INTERNAL USE!)
+    public static User getUserBySessionID(String sessionID)
+    {
+        return mapping.get(sessionID);
+    }
+
+    public static boolean removeUser(String sessionID)
+    {
+        try
+        {
+            mapping.remove(sessionID);
+            return true;
+        }
+        catch(Exception e)
+        {
+            return false;
+        }
+    }
+
+    public static String addUser(String mail, String password)
+    {
+        //try to get user from database
+        User user = DataBaseHandler.getInstance().getUser(mail, password);
+
+        //if user exists
+        if(user != null)
+        {
+            //generate random session id based on ascii table
+            byte[] id = new byte[100];
+
+            for(int i = 0; i < id.length; i++)
+            {
+                id[i] = (byte) (Math.random() * 26 + 64);
+            }
+
+            String generatedString = new String(id, StandardCharsets.US_ASCII);
+
+            mapping.put(generatedString, user);
+
+            //makes user session expire after ca. 2h
+            new java.util.Timer().schedule(new java.util.TimerTask(){
+
+                @Override
+                public void run()
+                {
+                    mapping.remove(generatedString);
+                    return;
+                }
+            }, 7500000);
+
+            return generatedString;
+        }
+
+        return "failed";
+    }
+}

backend/src/main/java/com/example/backend/anwprj/controller/EntriesController.java

@@ -0,0 +1,139 @@
+package com.example.backend.anwprj.controller;
+
+import com.example.backend.anwprj.Database.DataBaseHandler;
+import com.example.backend.anwprj.Entries.Entry;
+import com.example.backend.anwprj.Users.User;
+import com.example.backend.anwprj.Users.UserPermissions;
+import com.example.backend.anwprj.Users.UserSessionIDHandler;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+public class EntriesController
+{
+    private DataBaseHandler db;
+
+    {
+        db = DataBaseHandler.getInstance();
+    }
+
+    /**
+     GET
+     a set of entries for a week, based on the semester, the startdaynumber of the week and the year
+     Every user is allowed
+     */
+    @CrossOrigin
+    @GetMapping("/entries")
+    public ResponseEntity<Entry[][]> getEntries(@RequestParam(name = "semesterid") int semesterid,
+                                                @RequestParam(name = "daynumber") int daynumber,
+                                                @RequestParam(name = "yearnumber") int yearnumber,
+                                                @RequestParam(name = "sessionid") String sessionid)
+    {
+        User sessionUser = UserSessionIDHandler.getUserBySessionID(sessionid);
+
+        if (sessionUser != null)
+        {
+            var lonelyEntry = db.getEntries(semesterid, daynumber, yearnumber);
+            var happyEntry = db.getAllEntrys(semesterid, daynumber, yearnumber, sessionUser.getId());
+            var combinedEntry = new Entry[6][20];
+            for (int i = 0; i < 6; i++) {
+                var idx = 0;
+                for (int j = 0; j < 20; j++) {
+                    if (lonelyEntry != null && lonelyEntry[i][j] != null){
+                        combinedEntry[i][idx] = lonelyEntry[i][j];
+                        idx++;
+                    }
+                    if (happyEntry != null && happyEntry[i][j] != null){
+                        combinedEntry[i][idx] = happyEntry[i][j];
+                        idx++;
+                    }
+                }
+            }
+
+
+            return new ResponseEntity<>(combinedEntry, HttpStatus.OK);
+        }
+
+        return new ResponseEntity<>(null, HttpStatus.FORBIDDEN);
+    }
+
+    @CrossOrigin
+    @GetMapping("/entries/planned")
+    public ResponseEntity<Integer[]> getEntries(@RequestParam(name = "semesterid") int semesterid,
+                                                @RequestParam(name = "sessionid") String sessionid)
+    {
+        User sessionUser = UserSessionIDHandler.getUserBySessionID(sessionid);
+        if (sessionUser != null)
+        {
+            var entries = db.getAllEntries(semesterid, sessionUser.getId());
+            var count = 0;
+            for (int i = 0; i < entries.length; i++) {
+                count += entries[i].getTimeend()-entries[i].getTimestart();
+            }
+            return new ResponseEntity<>(new Integer[]{count}, HttpStatus.OK);
+        }
+        return new ResponseEntity<>(HttpStatus.FORBIDDEN);
+    }
+
+    /**
+     POST
+     A new entry to the database. Every user except of admins is allowed
+     */
+
+    @CrossOrigin
+    @PostMapping("/entries")
+    public ResponseEntity<Boolean> postEntry(@RequestBody Entry entry, @RequestParam(name = "sessionid") String sessionid)
+    {
+        User sessionUser = UserSessionIDHandler.getUserBySessionID(sessionid);
+
+        if (sessionUser != null && sessionUser.getPermissions() == UserPermissions.self.getValue())
+        {
+            db.addEntry(entry);
+            return new ResponseEntity<>(true, HttpStatus.OK);
+        }
+
+        return new ResponseEntity<>(false, HttpStatus.FORBIDDEN);
+    }
+
+
+    /**
+     PUT
+     Update the endTime of an existing entry in the database. Every user except of admins is allowed
+     */
+
+    @CrossOrigin
+    @PutMapping("/entries")
+    public ResponseEntity<Boolean> updateEntry(@RequestParam(name="sessionid") String sessionid, @RequestBody Entry entry)
+    {
+        User sessionUser = UserSessionIDHandler.getUserBySessionID(sessionid);
+        if (sessionUser != null)
+        {
+            db.updateEntry(entry);
+            return new ResponseEntity<>(true, HttpStatus.OK);
+        }
+
+        return new ResponseEntity<>(false, HttpStatus.FORBIDDEN);
+    }
+
+
+    /**
+     Delete
+     an existing entry from the database
+     */
+    @CrossOrigin
+    @DeleteMapping("/entries")
+    public ResponseEntity<Boolean> deleteEntry(@RequestParam(name = "id") int id, @RequestParam(name = "sessionid") String sessionid)
+    {
+        User sessionUser = UserSessionIDHandler.getUserBySessionID(sessionid);
+
+        if (sessionUser != null)
+        {
+            db.deleteEntry(id);
+            return new ResponseEntity<>(true, HttpStatus.OK);
+        }
+
+        return new ResponseEntity<>(false, HttpStatus.FORBIDDEN);
+    }
+
+}

backend/src/main/java/com/example/backend/anwprj/controller/ModuleController.java

@@ -0,0 +1,168 @@
+package com.example.backend.anwprj.controller;
+
+import com.example.backend.anwprj.Database.DataBaseHandler;
+import com.example.backend.anwprj.Module.Module;
+import com.example.backend.anwprj.Users.User;
+import com.example.backend.anwprj.Users.UserPermissions;
+import com.example.backend.anwprj.Users.UserSessionIDHandler;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Ein Modul hier entspricht nicht z.b. Analysis im Allgemeinen.
+ * Es beschreibt die Verbindung zwischen einem Dozenten und Analysis in einem Speziellen Semester.
+ */
+
+@RestController
+public class ModuleController
+{
+    private final DataBaseHandler db;
+
+    {
+        db = DataBaseHandler.getInstance();
+    }
+
+
+    /**
+    GET
+     A Module by its id
+     */
+    @CrossOrigin
+    @GetMapping("/module/id")
+    public ResponseEntity<Module[]> getModules(
+            @RequestParam(name = "sessionid") String sessionID)
+    {
+
+        User user = UserSessionIDHandler.getUserBySessionID(sessionID);
+
+        if (user != null)
+        {
+            Module[] modules = db.getModules(user.getId());
+            if (modules != null)
+            {
+                return new ResponseEntity<>(modules, HttpStatus.OK);
+            }
+
+            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
+        }
+
+        return new ResponseEntity<>(HttpStatus.FORBIDDEN);
+    }
+
+    @CrossOrigin
+    @GetMapping("/module/bysemesterid")
+    public ResponseEntity<Module[]> getModulesBySemesterID(@RequestParam(name="sessionid") String sessionID, @RequestParam(name="semesterid") int semesterid)
+    {
+        User user = UserSessionIDHandler.getUserBySessionID(sessionID);
+
+        if(user != null && user.getPermissions() == UserPermissions.admin.getValue())
+        {
+            Module[] tempModuleArray = db.getAllModules();
+            List<Module> result = new ArrayList<>();
+
+            for(int i = 0; i < tempModuleArray.length; i++)
+            {
+                if(tempModuleArray[i].getsemesterid() == semesterid)
+                {
+                    result.add(tempModuleArray[i]);
+                }
+            }
+
+            return new ResponseEntity<>(result.toArray(new Module[0]), HttpStatus.OK);
+        }
+
+        return new ResponseEntity<>(HttpStatus.FORBIDDEN);
+    }
+
+    /**
+     GET
+     all modules from the database. (Not used now)
+     */
+    @CrossOrigin
+    @GetMapping("/module/all")
+    public ResponseEntity<Module[]> getModule(@RequestParam(name = "sessionid") String sessionid)
+    {
+        User u = UserSessionIDHandler.getUserBySessionID(sessionid);
+
+        if (u != null)
+        {
+            if (u.getPermissions() == UserPermissions.admin.getValue())
+            {
+                return new ResponseEntity<>(db.getAllModules(), HttpStatus.OK);
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     POST
+     a new module entry. (When a user is selected in a semester.)
+     */
+    @CrossOrigin
+    @PostMapping("/module")
+    public ResponseEntity<Module> addModule(@RequestBody Module module, @RequestParam(name = "sessionid") String sessionID)
+    {
+
+        User user = UserSessionIDHandler.getUserBySessionID(sessionID);
+
+        if (user.getPermissions() == UserPermissions.admin.getValue())
+        {
+            Module m = db.addModule(module);
+            if (m != null)
+            {
+                return new ResponseEntity<>(m, HttpStatus.OK);
+            }
+
+            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
+        }
+
+
+        return new ResponseEntity<>(HttpStatus.FORBIDDEN);
+    }
+
+    /**
+    PUT
+     Update a Module
+     */
+    @CrossOrigin
+    @PutMapping("/module")
+    public ResponseEntity<Module> updateModule(@RequestBody Module module, @RequestParam(name = "sessionid") String sessionID)
+    {
+
+        User u = UserSessionIDHandler.getUserBySessionID(sessionID);
+        if (u != null)
+        {
+            Module m = db.updateModule(module);
+
+            if (m != null)
+            {
+                return new ResponseEntity<>(m, HttpStatus.OK);
+            }
+
+            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
+        }
+
+        return new ResponseEntity<>(HttpStatus.FORBIDDEN);
+    }
+
+    /**
+    DELETE
+    Delete A Module
+     */
+    @CrossOrigin
+    @DeleteMapping("/module")
+    public void deleteModule(@RequestParam(name = "sessionid") String sessionid, @RequestParam(name="id") int id)
+    {
+        User u = UserSessionIDHandler.getUserBySessionID(sessionid);
+        if (u != null && u.getPermissions() == UserPermissions.admin.getValue())
+        {
+            db.deleteModule(id);
+        }
+
+    }
+}

backend/src/main/java/com/example/backend/anwprj/controller/SemesterController.java

@@ -0,0 +1,156 @@
+package com.example.backend.anwprj.controller;
+
+import com.example.backend.anwprj.Database.DataBaseHandler;
+import com.example.backend.anwprj.Semesters.Semester;
+import com.example.backend.anwprj.Users.User;
+import com.example.backend.anwprj.Users.UserPermissions;
+import com.example.backend.anwprj.Users.UserSessionIDHandler;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@RestController
+public class SemesterController
+{
+    //reference to the database handler
+    private DataBaseHandler db;
+
+    {
+        db = DataBaseHandler.getInstance();
+    }
+
+    //get a semester object by its name
+    @CrossOrigin
+    @GetMapping("/semester")
+    public ResponseEntity<Semester> getSemester(@RequestParam(name="name") String name, @RequestParam(name="sessionid") String sessionID)
+    {
+        User u = UserSessionIDHandler.getUserBySessionID(sessionID);
+
+        if(u != null)
+        {
+            Semester s = db.getSemester(name);
+            if (s != null)
+            {
+                return new ResponseEntity<>(s, HttpStatus.OK);
+            }
+
+            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
+        }
+
+        return new ResponseEntity<>(HttpStatus.FORBIDDEN);
+    }
+
+    @CrossOrigin
+    @GetMapping("/semester/id")
+    public ResponseEntity<Semester> getSemester(@RequestParam(name="id") int id, @RequestParam(name="sessionid") String sessionID)
+    {
+        User u = UserSessionIDHandler.getUserBySessionID(sessionID);
+
+        if(u != null)
+        {
+            Semester s = db.getSemester(id);
+            if(s != null)
+            {
+                return new ResponseEntity<>(s, HttpStatus.OK);
+            }
+
+            return new ResponseEntity<>(null, HttpStatus.OK);
+        }
+
+        return new ResponseEntity<>(HttpStatus.FORBIDDEN);
+    }
+
+    @CrossOrigin
+    @GetMapping("/semester/id/all")
+    public ResponseEntity<Semester[]> getSemestersAll(@RequestParam(name="ids") String ids, @RequestParam(name="sessionid") String sessionid)
+    {
+        String[] idsSplit = ids.split("a");
+
+        List<Semester> resultList = new ArrayList<>();
+
+        for(int i = 0; i < idsSplit.length; i++)
+        {
+            int currentID = Integer.parseInt(idsSplit[i]);
+            resultList.add(db.getSemester(currentID));
+        }
+
+        return new ResponseEntity<>(resultList.toArray(new Semester[0]), HttpStatus.OK);
+    }
+
+    @CrossOrigin
+    @GetMapping("/semester/all")
+    public ResponseEntity<Semester[]> getSemester(@RequestParam(name="sessionid") String sessionid)
+    {
+        User u = UserSessionIDHandler.getUserBySessionID(sessionid);
+
+        if(u != null)
+        {
+            if(u.getPermissions() == UserPermissions.admin.getValue())
+            {
+                return new ResponseEntity<>(db.getAllSemesters(), HttpStatus.OK);
+            }
+        }
+
+        return null;
+    }
+
+
+    //a new semester add is requested (only allowed for admin users)
+    @CrossOrigin
+    @PostMapping("/semester")
+    public ResponseEntity<Semester> addSemester(@RequestBody Semester semester, @RequestParam(name="sessionid") String sessionID)
+    {
+        User user = UserSessionIDHandler.getUserBySessionID(sessionID);
+
+        if(user.getPermissions() == UserPermissions.admin.getValue())
+        {
+            Semester s = db.addSemester(semester);
+            if(s != null)
+            {
+
+                return new ResponseEntity<>(s, HttpStatus.OK);
+            }
+
+            return new ResponseEntity<>(null, HttpStatus.NOT_FOUND);
+        }
+
+
+        return new ResponseEntity<>(HttpStatus.FORBIDDEN);
+    }
+
+
+    @CrossOrigin
+    @PutMapping("/semester")
+    public ResponseEntity<Semester> updateSemester(@RequestBody Semester semester, @RequestParam(name="sessionid") String sessionID)
+    {
+        User u = UserSessionIDHandler.getUserBySessionID(sessionID);
+        if(u != null && u.getPermissions() == UserPermissions.admin.getValue())
+        {
+            Semester s = db.updateSemester(semester);
+
+            if(s != null)
+            {
+                return new ResponseEntity<>(s, HttpStatus.OK);
+            }
+
+            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
+        }
+
+        return new ResponseEntity<>(HttpStatus.FORBIDDEN);
+    }
+
+    @CrossOrigin
+    @DeleteMapping("/semester")
+    public void deleteSemester(@RequestParam(name="sessionid") String sessionid, @RequestParam(name="id") int id)
+    {
+        User u = UserSessionIDHandler.getUserBySessionID(sessionid);
+        if(u != null && u.getPermissions() == UserPermissions.admin.getValue())
+        {
+            db.deleteSemester(id);
+        }
+
+    }
+}

backend/src/main/java/com/example/backend/anwprj/controller/UserController.java

@@ -0,0 +1,185 @@
+package com.example.backend.anwprj.controller;
+
+import com.example.backend.discard.Encryption.RSA;
+import com.example.backend.anwprj.Database.DataBaseHandler;
+import com.example.backend.anwprj.Users.User;
+import com.example.backend.anwprj.Users.UserPermissions;
+import com.example.backend.anwprj.Users.UserSessionIDHandler;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+public class UserController {
+    //reference to the database handler
+    private DataBaseHandler db;
+
+    {
+        db = DataBaseHandler.getInstance();
+    }
+
+    @CrossOrigin
+    @GetMapping("/users/all")
+    public ResponseEntity<User[]> getAllUsers(@RequestParam(name = "sessionid") String sessionid)
+    {
+        User u = UserSessionIDHandler.getUserBySessionID(sessionid);
+
+        if(u != null && u.getPermissions() == UserPermissions.admin.getValue())
+        {
+            User[] output = db.getAllUsers();
+            return new ResponseEntity<>(output, HttpStatus.OK);
+        }
+
+        return new ResponseEntity<>(HttpStatus.FORBIDDEN);
+    }
+
+
+    //a user wants to login
+    @CrossOrigin
+    @GetMapping("/users")
+    public ResponseEntity<String> login(@RequestParam(name = "mail") String mail, @RequestParam(name = "password") String password) {
+        //generate a session id for the user trying to login
+        boolean isEncrypted = false;
+        if(isEncrypted)
+        {
+            RSA rsa = RSA.getInstance();
+            byte[] psw = rsa.loadByteArray(password);
+            try {
+                password = rsa.decrypt(psw);
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+        }
+
+        mail = mail.toLowerCase();
+        String sessionID = UserSessionIDHandler.addUser(mail, password);
+
+        return new ResponseEntity<>(sessionID, HttpStatus.OK);
+    }
+
+    @CrossOrigin
+    @GetMapping("/users/logout")
+    public ResponseEntity<Boolean> logout(@RequestParam(name = "sessionid") String sessionID) {
+        boolean success = UserSessionIDHandler.removeUser(sessionID);
+        return new ResponseEntity<>(success, HttpStatus.OK);
+    }
+
+    @CrossOrigin
+    @GetMapping("/users/data")
+    public ResponseEntity<User> getUserData(
+            @RequestParam(name = "sessionid") String sessionID,
+            @RequestParam(name = "mail") String mail) {
+        User sessionUser = UserSessionIDHandler.getUserBySessionID(sessionID);
+
+        if (sessionUser != null) {
+            System.out.println(sessionUser.getMail() + " " + mail);
+
+            if (sessionUser.getMail().equals(mail) || sessionUser.getPermissions() == UserPermissions.admin.getValue()) {
+                User searchedUser = db.getUser(mail);
+                return new ResponseEntity<>(searchedUser, HttpStatus.OK);
+            }
+        }
+
+        return new ResponseEntity<>(HttpStatus.FORBIDDEN);
+    }
+
+    @CrossOrigin
+    @GetMapping("/users/check")
+    public ResponseEntity<User> checkLogin(@RequestParam(name="sessionid") String sessionid)
+    {
+        User u = UserSessionIDHandler.getUserBySessionID(sessionid);
+
+        if(u != null)
+        {
+            return new ResponseEntity<>(db.getUser(u.getId()), HttpStatus.OK);
+        }
+
+        return new ResponseEntity<>(HttpStatus.NOT_FOUND);
+    }
+
+    //adds a new user to the database (cannot create an admin user)
+    @CrossOrigin
+    @PostMapping("/users")
+    public ResponseEntity<String> addUser(@RequestBody User user) {
+        User checkUser = db.getUser(user.getMail());
+
+        if (checkUser != null) {
+            return new ResponseEntity<>("mail", HttpStatus.FORBIDDEN);
+        }
+
+        //if user was successfully added to database
+        User u = db.addUser(user);
+
+        if (u != null) {
+            //generate a session id
+            return new ResponseEntity<String>(UserSessionIDHandler.addUser(user.getMail(), user.getPassword()), HttpStatus.OK);
+        }
+
+        return new ResponseEntity<String>(HttpStatus.BAD_REQUEST);
+    }
+
+    @CrossOrigin
+    @PutMapping("/users")
+    public ResponseEntity<Boolean> updateUser(@RequestParam(name = "sessionid") String sessionID, @RequestBody User u, @RequestParam(name = "mail") String mail) {
+        User sessionUser = UserSessionIDHandler.getUserBySessionID(sessionID);
+
+        if (sessionUser != null) {
+            if (sessionUser.getMail().equals(mail) || sessionUser.getPermissions() == UserPermissions.admin.getValue()) {
+                System.out.println(sessionUser.getId());
+
+                User resultingUser = db.updateUser(u, sessionUser.getId(), false);
+
+                if (resultingUser != null) {
+                    UserSessionIDHandler.removeUser(sessionID);
+                    return new ResponseEntity<>(true, HttpStatus.OK);
+                }
+
+                return new ResponseEntity<>(false, HttpStatus.NOT_FOUND);
+            }
+        }
+
+        return new ResponseEntity<>(false, HttpStatus.FORBIDDEN);
+    }
+
+    @CrossOrigin
+    @PutMapping("/users/elevate")
+    public ResponseEntity<Boolean> elevateUser(
+            @RequestParam(name = "sessionid") String sessionID,
+            @RequestParam(name = "mail") String mail,
+            @RequestParam(name = "permission") int permission)
+    {
+        User sessionUser = UserSessionIDHandler.getUserBySessionID(sessionID);
+
+        if(sessionUser != null && sessionUser.getPermissions() == UserPermissions.admin.getValue())
+        {
+            System.out.println("test");
+            User userToUpdateTemplate = db.getUser(mail);
+            User userToUpdate = new User(userToUpdateTemplate.getId(), userToUpdateTemplate.getFirstName(), userToUpdateTemplate.getLastName(),
+                    userToUpdateTemplate.getMail(), userToUpdateTemplate.getPassword(), permission);
+
+            User resultingUser = db.updateUser(userToUpdate, userToUpdate.getId(), true);
+
+            if(resultingUser == null)
+            {
+                return new ResponseEntity<>(false, HttpStatus.NOT_FOUND);
+            }
+
+            return new ResponseEntity<>(true, HttpStatus.OK);
+        }
+
+        return new ResponseEntity<>(false, HttpStatus.FORBIDDEN);
+    }
+
+    @CrossOrigin
+    @DeleteMapping("/users")
+    public ResponseEntity<Boolean> deleteUser(@RequestParam(name = "sessionid") String sessionID, @RequestParam(name = "mail") String mail) {
+        User sessionUser = UserSessionIDHandler.getUserBySessionID(sessionID);
+
+        if (sessionUser != null && sessionUser.getPermissions() == UserPermissions.admin.getValue()) {
+            return new ResponseEntity<>(db.deleteUser(mail), HttpStatus.OK);
+        }
+
+        return new ResponseEntity<>(HttpStatus.FORBIDDEN);
+    }
+
+}

backend/src/main/java/com/example/backend/discard/DayController.java

@@ -0,0 +1,60 @@
+package com.example.backend.discard;
+
+import com.example.backend.anwprj.Database.DataBaseHandler;
+import com.example.backend.discard.Days.Day;
+import com.example.backend.anwprj.Users.User;
+import com.example.backend.anwprj.Users.UserPermissions;
+import com.example.backend.anwprj.Users.UserSessionIDHandler;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+public class DayController
+{
+
+//    private DataBaseHandler db;
+//
+//    {
+//        db = DataBaseHandler.getInstance();
+//    }
+//
+//    @CrossOrigin
+//    @GetMapping("/days")
+//    public ResponseEntity<Day> getDay(
+//            @RequestParam(name="sessionid") String sessionID,
+//            @RequestParam(name="dayinyear") int dayinyear,
+//            @RequestParam(name="yearnumber") int yearnumber,
+//            @RequestParam(name="semesterid") int semesterID)
+//    {
+//        User u = UserSessionIDHandler.getUserBySessionID(sessionID);
+//
+//        if(u != null)
+//        {
+//            Day d = db.getDay(dayinyear, yearnumber, semesterID);
+//
+//            if (d != null)
+//            {
+//                return new ResponseEntity<>(d, HttpStatus.OK);
+//            }
+//
+//            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
+//        }
+//
+//        return new ResponseEntity<>(HttpStatus.FORBIDDEN);
+//    }
+//
+//    @CrossOrigin
+//    @PostMapping("/days")
+//    public ResponseEntity<Day> addDay(@RequestBody Day day, @RequestParam(name="sessionid") String sessionID)
+//    {
+//        User u = UserSessionIDHandler.getUserBySessionID(sessionID);
+//
+//        if(u != null && u.getPermissions() == UserPermissions.admin.getValue())
+//        {
+//            return new ResponseEntity<>(db.addDay(day), HttpStatus.OK);
+//        }
+//
+//        return new ResponseEntity<>(null, HttpStatus.FORBIDDEN);
+//    }
+}

backend/src/main/java/com/example/backend/discard/Days/Day.java

@@ -0,0 +1,32 @@
+package com.example.backend.discard.Days;
+
+public class Day
+{
+    private int id;
+    private int dayinyear;
+    private int yearnumber;
+    private int semesterid;
+
+    public Day(int id, int dayinyear, int yearnumber, int semesterid) {
+        this.id = id;
+        this.dayinyear = dayinyear;
+        this.yearnumber = yearnumber;
+        this.semesterid = semesterid;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public int getDayinyear() {
+        return dayinyear;
+    }
+
+    public int getYearnumber() {
+        return yearnumber;
+    }
+
+    public int getSemesterid() {
+        return semesterid;
+    }
+}

backend/src/main/java/com/example/backend/discard/Encryption/RSA.java

@@ -0,0 +1,58 @@
+package com.example.backend.discard.Encryption;
+
+import javax.crypto.Cipher;
+import java.io.*;
+import java.nio.charset.StandardCharsets;
+import java.security.*;
+
+public class RSA {
+
+    private PublicKey publicKey;
+    private PrivateKey privateKey;
+
+    private static RSA instance = null;
+
+    public static RSA getInstance()
+    {
+        if(instance == null)
+        {
+            instance = new RSA();
+        }
+
+        return instance;
+    }
+
+    private RSA(){}
+
+    public String decrypt(byte[] text) throws Exception
+    {
+        readKeyPairs();
+        var cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
+        cipher.init(Cipher.DECRYPT_MODE, privateKey);
+        var plainText = cipher.doFinal(text);
+        return new String(plainText, StandardCharsets.US_ASCII);
+    }
+
+    private void readKeyPairs() throws Exception
+    {
+        var publicInput = new ObjectInputStream(new FileInputStream(new File("./public.kfs")));
+        publicKey = (PublicKey) publicInput.readObject();
+        publicInput.close();
+
+        var privateInput = new ObjectInputStream(new FileInputStream(new File("./private.kfs")));
+        privateKey  = (PrivateKey) privateInput.readObject();
+        privateInput.close();
+    }
+
+    public byte[] loadByteArray(String text)
+    {
+        String[] split = text.split(",");
+        byte[] output = new byte[split.length];
+        for(int i = 0; i < split.length; i++)
+        {
+            output[i] = Byte.parseByte(split[i]);
+        }
+
+        return output;
+    }
+}

backend/src/main/java/com/example/backend/discard/OldDataBaseFunctions.txt

@@ -0,0 +1,124 @@
+    /**
+     * WEEKS
+     */
+
+    public Week addWeek(Week week)
+    {
+        try
+        {
+            st.executeUpdate("insert into weeks (semesterid, weeknumber) values (" + week.getSemesterid() + ", " + week.getWeeknumber() + ")");
+
+            return getWeek(week.getSemesterid(), week.getWeeknumber());
+
+        } catch (SQLException e)
+        {
+            return null;
+        }
+    }
+
+    public Week getWeek(int id)
+    {
+        ResultSet rs = null;
+        try
+        {
+            rs = st.executeQuery("select * from weeks where id=" + id);
+
+            return resultSetToWeek(rs);
+
+        } catch (SQLException e)
+
+        {
+            return null;
+        }
+
+    }
+
+    public Week getWeek(int semesterid, int weeknumber)
+    {
+        try
+        {
+            ResultSet rs = st.executeQuery("select * from weeks where semesterid =" + semesterid + " and weeknumber=" + weeknumber);
+
+            return resultSetToWeek(rs);
+        }
+        catch (SQLException e)
+        {
+            return null;
+        }
+
+    }
+
+    private Week resultSetToWeek(ResultSet rs) {
+        try {
+            rs.next();
+
+            return new Week(
+                    rs.getInt("id"),
+                    rs.getInt("semesterid"),
+                    rs.getInt("weeknumber")
+            );
+        } catch (SQLException e) {
+            return null;
+        }
+    }
+
+    /**
+     DAYS
+     */
+    public Day addDay(Day day)
+    {
+        try
+        {
+            st.executeUpdate("insert into days (dayinyear, yearnumber, semesterid) values (" + day.getDayinyear() + ", " + day.getYearnumber() + ", " + day.getSemesterid() + ")");
+            return getDay(day.getDayinyear(), day.getYearnumber(), day.getSemesterid());
+        } catch (SQLException e)
+        {
+            return null;
+        }
+    }
+
+    public Day getDay(int id)
+    {
+        try
+        {
+            ResultSet rs = st.executeQuery("select * from days where id=" + id);
+
+            return resultSetToDay(rs);
+        }
+        catch(Exception e)
+        {
+            return null;
+        }
+    }
+
+    public Day getDay(int dayinyear, int yearnumber, int semesterid)
+    {
+        try
+        {
+            ResultSet rs = st.executeQuery("select * from days where dayinyear =" + dayinyear + " and yearnumber =" + yearnumber + " and semesterid =" + semesterid);
+
+            return resultSetToDay(rs);
+        }
+        catch(Exception e)
+        {
+            return null;
+        }
+    }
+
+    private Day resultSetToDay(ResultSet rs)
+    {
+        try
+        {
+            rs.next();
+
+            return new Day(
+                    rs.getInt("id"),
+                    rs.getInt("dayinyear"),
+                    rs.getInt("yearnumber"),
+                    rs.getInt("semesterid")
+            );
+        } catch (SQLException e)
+        {
+            return null;
+        }
+    }

backend/src/main/java/com/example/backend/discard/Week/Week.java

@@ -0,0 +1,26 @@
+package com.example.backend.discard.Week;
+
+public class Week {
+
+    private int id;
+    private int semesterid;
+    private int weeknumber;
+
+    public Week(int id, int semesterid, int weeknumber) {
+        this.id = id;
+        this.semesterid = semesterid;
+        this.weeknumber = weeknumber;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public int getSemesterid() {
+        return semesterid;
+    }
+
+    public int getWeeknumber() {
+        return weeknumber;
+    }
+}

backend/src/main/java/com/example/backend/discard/WeekController.java

@@ -0,0 +1,59 @@
+package com.example.backend.discard;
+
+import com.example.backend.anwprj.Database.DataBaseHandler;
+import com.example.backend.anwprj.Users.User;
+import com.example.backend.anwprj.Users.UserPermissions;
+import com.example.backend.anwprj.Users.UserSessionIDHandler;
+import org.springframework.http.HttpStatus;
+import com.example.backend.discard.Week.Week;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.sql.SQLException;
+
+@RestController
+public class WeekController
+{
+
+//    private DataBaseHandler db;
+//
+//    {
+//        db = DataBaseHandler.getInstance();
+//    }
+//
+//    @CrossOrigin
+//    @GetMapping("/weeks")
+//    public ResponseEntity<Week> getWeek(
+//            @RequestParam(name="sessionid") String sessionID,
+//            @RequestParam(name="semesterid") int semesterID,
+//            @RequestParam(name="weeknumber") int weekNumber) throws SQLException {
+//        User u = UserSessionIDHandler.getUserBySessionID(sessionID);
+//
+//        if(u != null)
+//        {
+//            Week w = db.getWeek(semesterID,weekNumber);
+//
+//            if(w != null)
+//            {
+//                return new ResponseEntity<>(w, HttpStatus.OK);
+//            }
+//            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
+//        }
+//        return new ResponseEntity<>(HttpStatus.FORBIDDEN);
+//    }
+//
+//    @CrossOrigin
+//    @PostMapping("/weeks")
+//    public ResponseEntity<Week> addWeek(@RequestBody Week week, @RequestParam(name="sessionid") String sessionID)
+//    {
+//        User u = UserSessionIDHandler.getUserBySessionID(sessionID);
+//
+//        if(u !=null && u.getPermissions() == UserPermissions.admin.getValue())
+//        {
+//            return new ResponseEntity<>(db.addWeek(week), HttpStatus.OK);
+//        }
+//
+//        return new ResponseEntity<>(null, HttpStatus.FORBIDDEN);
+//    }
+}
+

backend/src/main/resources/application.properties

@@ -0,0 +1 @@
+

backend/src/test/java/com/example/backend/BackendApplicationTests.java

@@ -0,0 +1,15 @@
+package com.example.backend;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class BackendApplicationTests
+{
+
+    @Test
+    void contextLoads()
+    {
+    }
+
+}