import 'dart:io';
import 'dart:math';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:obtainium/custom_errors.dart';
import 'package:obtainium/pages/home.dart';
import 'package:obtainium/providers/apps_provider.dart';
import 'package:obtainium/providers/notifications_provider.dart';
import 'package:obtainium/providers/settings_provider.dart';
import 'package:obtainium/providers/source_provider.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:provider/provider.dart';
import 'package:dynamic_color/dynamic_color.dart';
import 'package:device_info_plus/device_info_plus.dart';
import 'package:android_alarm_manager_plus/android_alarm_manager_plus.dart';

const String currentVersion = '0.6.10';
const String currentReleaseTag =
    'v$currentVersion-beta'; // KEEP THIS IN SYNC WITH GITHUB RELEASES

const int bgUpdateCheckAlarmId = 666;

@pragma('vm:entry-point')
Future<void> bgUpdateCheck(int taskId, Map<String, dynamic>? params) async {
  int? ignoreAfterMicroseconds = params?['ignoreAfterMicroseconds'];
  WidgetsFlutterBinding.ensureInitialized();
  await AndroidAlarmManager.initialize();
  DateTime? ignoreAfter = ignoreAfterMicroseconds != null
      ? DateTime.fromMicrosecondsSinceEpoch(ignoreAfterMicroseconds)
      : null;
  var notificationsProvider = NotificationsProvider();
  await notificationsProvider.notify(checkingUpdatesNotification);
  try {
    var appsProvider = AppsProvider(forBGTask: true);
    await notificationsProvider.cancel(ErrorCheckingUpdatesNotification('').id);
    await appsProvider.loadApps();
    List<String> existingUpdateIds =
        appsProvider.findExistingUpdates(installedOnly: true);
    DateTime nextIgnoreAfter = DateTime.now();
    String? err;
    try {
      await appsProvider.checkUpdates(
          ignoreAppsCheckedAfter: ignoreAfter, throwErrorsForRetry: true);
    } catch (e) {
      if (e is RateLimitError || e is SocketException) {
        AndroidAlarmManager.oneShot(
            Duration(minutes: e is RateLimitError ? e.remainingMinutes : 15),
            Random().nextInt(pow(2, 31) as int),
            bgUpdateCheck,
            params: {
              'ignoreAfterMicroseconds': nextIgnoreAfter.microsecondsSinceEpoch
            });
      } else {
        err = e.toString();
      }
    }
    List<App> newUpdates = appsProvider
        .findExistingUpdates(installedOnly: true)
        .where((id) => !existingUpdateIds.contains(id))
        .map((e) => appsProvider.apps[e]!.app)
        .toList();

    // TODO: This silent update code doesn't work yet
    // List<String> silentlyUpdated = await appsProvider
    //     .downloadAndInstallLatestApp(
    //         [...newUpdates.map((e) => e.id), ...existingUpdateIds], null);
    // if (silentlyUpdated.isNotEmpty) {
    //   newUpdates = newUpdates
    //       .where((element) => !silentlyUpdated.contains(element.id))
    //       .toList();
    //   notificationsProvider.notify(
    //       SilentUpdateNotification(
    //           silentlyUpdated.map((e) => appsProvider.apps[e]!.app).toList()),
    //       cancelExisting: true);
    // }

    if (newUpdates.isNotEmpty) {
      notificationsProvider.notify(UpdateNotification(newUpdates));
    }
    if (err != null) {
      throw err;
    }
  } catch (e) {
    notificationsProvider
        .notify(ErrorCheckingUpdatesNotification(e.toString()));
  } finally {
    await notificationsProvider.cancel(checkingUpdatesNotification.id);
  }
}

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  if ((await DeviceInfoPlugin().androidInfo).version.sdkInt >= 29) {
    SystemChrome.setSystemUIOverlayStyle(
      const SystemUiOverlayStyle(systemNavigationBarColor: Colors.transparent),
    );
    SystemChrome.setEnabledSystemUIMode(SystemUiMode.edgeToEdge);
  }
  await AndroidAlarmManager.initialize();
  runApp(MultiProvider(
    providers: [
      ChangeNotifierProvider(create: (context) => AppsProvider()),
      ChangeNotifierProvider(create: (context) => SettingsProvider()),
      Provider(create: (context) => NotificationsProvider())
    ],
    child: const Obtainium(),
  ));
}

var defaultThemeColour = Colors.deepPurple;

class Obtainium extends StatefulWidget {
  const Obtainium({super.key});

  @override
  State<Obtainium> createState() => _ObtainiumState();
}

class _ObtainiumState extends State<Obtainium> {
  var existingUpdateInterval = -1;

  @override
  Widget build(BuildContext context) {
    SettingsProvider settingsProvider = context.watch<SettingsProvider>();
    AppsProvider appsProvider = context.read<AppsProvider>();

    if (settingsProvider.prefs == null) {
      settingsProvider.initializeSettings();
    } else {
      bool isFirstRun = settingsProvider.checkAndFlipFirstRun();
      if (isFirstRun) {
        // If this is the first run, ask for notification permissions and add Obtainium to the Apps list
        Permission.notification.request();
        appsProvider.saveApps([
          App(
              'dev.imranr.obtainium',
              'https://github.com/ImranR98/Obtainium',
              'ImranR98',
              'Obtainium',
              currentReleaseTag,
              currentReleaseTag,
              [],
              0,
              ['true'],
              null)
        ]);
      }
      // Register the background update task according to the user's setting
      if (existingUpdateInterval != settingsProvider.updateInterval) {
        existingUpdateInterval = settingsProvider.updateInterval;
        if (existingUpdateInterval == 0) {
          AndroidAlarmManager.cancel(bgUpdateCheckAlarmId);
        } else {
          AndroidAlarmManager.periodic(
              Duration(minutes: existingUpdateInterval),
              bgUpdateCheckAlarmId,
              bgUpdateCheck,
              rescheduleOnReboot: true,
              wakeup: true);
        }
      }
    }

    return DynamicColorBuilder(
        builder: (ColorScheme? lightDynamic, ColorScheme? darkDynamic) {
      // Decide on a colour/brightness scheme based on OS and user settings
      ColorScheme lightColorScheme;
      ColorScheme darkColorScheme;
      if (lightDynamic != null &&
          darkDynamic != null &&
          settingsProvider.colour == ColourSettings.materialYou) {
        lightColorScheme = lightDynamic.harmonized();
        darkColorScheme = darkDynamic.harmonized();
      } else {
        lightColorScheme = ColorScheme.fromSeed(seedColor: defaultThemeColour);
        darkColorScheme = ColorScheme.fromSeed(
            seedColor: defaultThemeColour, brightness: Brightness.dark);
      }
      return MaterialApp(
          title: 'Obtainium',
          theme: ThemeData(
              useMaterial3: true,
              colorScheme: settingsProvider.theme == ThemeSettings.dark
                  ? darkColorScheme
                  : lightColorScheme,
              fontFamily: 'Metropolis'),
          darkTheme: ThemeData(
              useMaterial3: true,
              colorScheme: settingsProvider.theme == ThemeSettings.light
                  ? lightColorScheme
                  : darkColorScheme,
              fontFamily: 'Metropolis'),
          home: const HomePage());
    });
  }
}