76 lines
1.7 KiB
Dart
76 lines
1.7 KiB
Dart
import 'dart:convert';
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import 'dart:io';
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import 'package:http/http.dart' as http;
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import 'package:shared_preferences/shared_preferences.dart';
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class FetchMenu {
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static var lastFetch = DateTime.now();
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static var fetched = false;
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static Future<List<String>> get() async {
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List<String> menus = [];
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if (!fetched || DateTime.now().difference(lastFetch).inHours >= 2) {
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menus = await fromRequest();
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fetched = true;
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} else {
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menus = await fromCache();
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}
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return menus;
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}
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static Future<List<String>> fromCache() async {
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return await loadCache();
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}
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static Future<List<String>> fromRequest() async {
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List<String> menus = [];
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http.Response resp = await http.get(Uri.parse(
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"https://www.swfr.de/essen/mensen-cafes-speiseplaene/mensa-loerrach"));
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var content = resp.body.split("<h3>");
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var innerContent = content[1].split("\n");
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for (var s in innerContent) {
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if (s.contains("extra-text mb-15px")) {
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var name = (s.split("\">")[1].split("</")[0]).replaceAll("<br>", " ");
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menus.add(name);
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}
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}
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await storeCache(menus);
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lastFetch = DateTime.now();
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return menus;
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}
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static Future<void> storeCache(List<String> menus) async {
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var prefs = await SharedPreferences.getInstance();
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for (var i = 0; i < 4; i++) {
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prefs.setString("menuCache$i", "");
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if (i < menus.length) {
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prefs.setString("menuCache$i", menus[i]);
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}
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}
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}
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static Future<List<String>> loadCache() async {
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var prefs = await SharedPreferences.getInstance();
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List<String> menus = [];
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for (var i = 0; i < 4; i++) {
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var curr = prefs.getString("menuCache$i");
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if (curr != "") {
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menus.add(curr!);
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}
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}
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return menus;
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}
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}
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