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';
import 'package:workmanager/workmanager.dart';

String formatMinutes(int minutes) {
  int hours = minutes ~/ 60;
  int remainingMinutes = minutes % 60;

  String hoursString = "";
  String minutesString = "";

  if (hours > 0) {
    hoursString = "$hours h";
  }

  minutesString = "$remainingMinutes min";

  return "$hoursString $minutesString";
}

@pragma('vm:entry-point')
void callbackDispatcher() async {
  WidgetsFlutterBinding.ensureInitialized();

  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();
      bool notifiedDay = current["notifiedDay"];
      bool notifiedHour = current["notifiedHour"];
      int timeDiff = dueTime.difference(currentTime).inMinutes;
      if ((timeDiff <= 90 && !notifiedHour ||
              timeDiff > 23*60 && timeDiff <= 25 * 60 && !notifiedDay) &&
          timeDiff >= 0 &&
          !checked) {
        String notifyType = timeDiff <= 90 ? "notifiedHour" : "notifiedDay";

        await FileHandler.saveNotified(key, title, notifyType, true);

        AwesomeNotifications().createNotification(
            content: NotificationContent(
                id: id,
                channelKey: "reminder_channel",
                title: "Task due!",
                body:
                    "Task $title due in ${formatMinutes(timeDiff)} !"));
      }
      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,
    )
  ]);


  Workmanager().initialize(callbackDispatcher);
  Workmanager().registerPeriodicTask("1", "notifyTask", frequency: Duration(minutes: 15));

  // 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(),
      ),
    );
  }
}