import 'dart:async';

import 'package:flutter/material.dart';
import 'package:todoapp/elems/filehandler.dart';
import 'package:todoapp/pages/Home.dart';
import 'package:provider/provider.dart';
import 'package:todoapp/providers/todoprovider.dart';
import 'package:awesome_notifications/awesome_notifications.dart';
import 'package:disable_battery_optimization/disable_battery_optimization.dart';
import 'package:flutter_background_service/flutter_background_service.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'dart:math';

@pragma('vm:entry-point')
void callbackDispatcher() async {

  Map content = await FileHandler.fileContent;
  int id = 15;
  for (String key in content.keys) {
    Map list = content[key];
    for (String title in list.keys) {
      Map current = list[title];
      DateTime dueTime = DateTime.parse(current["dueTime"]);
      bool checked = current["checked"];
      DateTime currentTime = DateTime.now();
      int timeDiff = dueTime
          .difference(currentTime)
          .inMinutes;
      if (timeDiff <= 45 && timeDiff >= 0 && !checked) {
        AwesomeNotifications().createNotification(
            content: NotificationContent(
                id: id,
                channelKey: "reminder_channel",
                title: "Task due!",
                body: "Task $title due in $timeDiff minutes!"));
      }
      id++;
    }
  }
}

@pragma('vm:entry-point')
void onStart(ServiceInstance service) {
  Timer.periodic(const Duration(minutes: 15), (timer) {
    callbackDispatcher();
  });
}

Future<void> initService() async {
  final service = FlutterBackgroundService();

  await service.configure(
      iosConfiguration: IosConfiguration(),
      androidConfiguration: AndroidConfiguration(
          onStart: onStart,
          isForegroundMode: false,
          autoStart: true,
          autoStartOnBoot: true
      )
  );

  service.startService();
}

void main() async {
  WidgetsFlutterBinding.ensureInitialized();

  await AwesomeNotifications().initialize(null, [
    NotificationChannel(
      channelKey: "reminder_channel",
      channelName: "Reminders",
      channelDescription: "Reminder for ToDo",
      importance: NotificationImportance.High,
    )
  ]);

  await initService();
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MultiProvider(
      providers: [ChangeNotifierProvider(create: (context) => TodoProvider())],
      child: MaterialApp(
        theme: ThemeData(
          colorScheme: ColorScheme.fromSeed(
              seedColor: Colors.blue, brightness: Brightness.dark),
          useMaterial3: true,
        ),
        home: const Home(),
      ),
    );
  }
}