/*
 * Copyright (c) 2024-2026 Fabian Freund.
 *
 * This file is part of WebLibre
 * (see https://weblibre.eu).
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
import 'dart:async';
import 'dart:developer';

import 'package:background_fetch/background_fetch.dart';
import 'package:country_codes/country_codes.dart';
import 'package:dynamic_color/dynamic_color.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_hooks/flutter_hooks.dart';
import 'package:flutter_mozilla_components/flutter_mozilla_components.dart'
    show GeckoBrowserService, GeckoLoggingService, LogLevel;
import 'package:home_widget/home_widget.dart';
import 'package:hooks_riverpod/hooks_riverpod.dart';
import 'package:logger/logger.dart';
import 'package:nullability/nullability.dart';
import 'package:weblibre/core/design/app_colors.dart';
import 'package:weblibre/core/error_observer.dart';
import 'package:weblibre/core/filesystem.dart';
import 'package:weblibre/core/logger.dart';
import 'package:weblibre/core/providers/app_state.dart';
import 'package:weblibre/core/providers/defaults.dart';
import 'package:weblibre/core/providers/router.dart';
import 'package:weblibre/domain/services/app_initialization.dart';
import 'package:weblibre/features/user/domain/repositories/engine_settings.dart';
import 'package:weblibre/features/user/domain/repositories/general_settings.dart';
import 'package:weblibre/features/web_feed/presentation/controllers/fetch_articles.dart';
import 'package:weblibre/features/web_feed/utils/fetch_entrypoint.dart';
import 'package:weblibre/presentation/hooks/on_initialization.dart';
import 'package:weblibre/presentation/main_app.dart';

class _MainWidget extends HookConsumerWidget {
  const _MainWidget();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final rootKey = ref.watch(appStateKeyProvider);

    final pauseTime = useRef<DateTime?>(null);
    useOnAppLifecycleStateChange((previous, current) async {
      switch (current) {
        case AppLifecycleState.resumed:
          if (pauseTime.value != null &&
              DateTime.now().difference(pauseTime.value!) >
                  const Duration(minutes: 30)) {
            final routerConfig = ref
                .read(routerProvider)
                .value
                ?.routerDelegate
                .currentConfiguration;

            //Rebuild widget tree after long time of inactivity
            ref.read(appStateKeyProvider.notifier).reset();

            //Wait for the new router to start
            await Future.delayed(
              const Duration(milliseconds: 250),
            ).whenComplete(() {
              routerConfig.mapNotNull(
                (routerConfig) =>
                    ref.read(routerProvider).value?.restore(routerConfig),
              );
            });

            logger.i('UI reset');
          }
          pauseTime.value = null;
        case AppLifecycleState.detached:
        case AppLifecycleState.inactive:
        case AppLifecycleState.hidden:
        case AppLifecycleState.paused:
          pauseTime.value ??= DateTime.now();
      }
    });

    final themeMode = ref.watch(
      generalSettingsWithDefaultsProvider.select((value) => value.themeMode),
    );

    useOnInitialization(() async {
      await CountryCodes.init();

      final engineSettings = await ref
          .read(engineSettingsRepositoryProvider.notifier)
          .fetchSettings();
      final generalSettings = await ref
          .read(generalSettingsRepositoryProvider.notifier)
          .fetchSettings();

      try {
        await GeckoBrowserService().initialize(
          filesystem.relativeProfilePath,
          kDebugMode ? LogLevel.debug : LogLevel.warn,
          engineSettings.contentBlocking,
          engineSettings.addonCollection,
          generalSettings.syncServerOverride,
          generalSettings.syncTokenServerOverride,
        );
      } on PlatformException catch (e, s) {
        logger.e(
          'Platform exception during Gecko initialization',
          error: e,
          stackTrace: s,
        );
        rethrow;
      } catch (e, s) {
        logger.e(
          'Failed to initialize Gecko browser service',
          error: e,
          stackTrace: s,
        );
        rethrow;
      }

      await ref.read(appInitializationServiceProvider.notifier).initialize();

      if (!kDebugMode) {
        await BackgroundFetch.configure(
          BackgroundFetchConfig(
            minimumFetchInterval: 15,
            enableHeadless: true,
            stopOnTerminate: false,
            requiredNetworkType: NetworkType.ANY,
            startOnBoot: true,
          ),
          (String taskId) async {
            try {
              await ref
                  .read(fetchArticlesControllerProvider.notifier)
                  .fetchAllArticles();

              logger.i('Fetched articles in foreground');
            } catch (e, s) {
              logger.e('Failed fetching articles', error: e, stackTrace: s);
            } finally {
              await BackgroundFetch.finish(taskId);
            }
          },
        );
      }
    });

    return DynamicColorBuilder(
      builder: (lightDynamic, darkDynamic) {
        ColorScheme lightColorScheme;
        ColorScheme darkColorScheme;

        if (lightDynamic != null && darkDynamic != null) {
          // On Android S+ devices, use the provided dynamic color scheme.
          // (Recommended) Harmonize the dynamic color scheme' built-in semantic colors.
          lightColorScheme = lightDynamic.harmonized();

          // Repeat for the dark color scheme.
          darkColorScheme = darkDynamic.harmonized();
        } else {
          // Otherwise, use fallback schemes.
          lightColorScheme = ColorScheme.fromSeed(
            seedColor: ref.read(lightSeedColorFallbackProvider),
          );
          darkColorScheme = ColorScheme.fromSeed(
            seedColor: ref.read(darkSeedColorFallbackProvider),
            brightness: Brightness.dark,
          );
        }

        return MainApp(
          key: rootKey,
          theme: ThemeData(
            useMaterial3: true,
            colorScheme: lightColorScheme,
            extensions: const <ThemeExtension<dynamic>>[AppColors.light],
          ),
          darkTheme: ThemeData(
            useMaterial3: true,
            colorScheme: darkColorScheme,
            extensions: const <ThemeExtension<dynamic>>[AppColors.dark],
          ),
          themeMode: themeMode,
        );
      },
    );
  }
}

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

  FlutterError.onError = (e) {
    logger.e(e.toString(), error: e.exception, stackTrace: e.stack);
  };

  PlatformDispatcher.instance.onError = (error, stack) {
    logger.e('Unhandled Error', error: error, stackTrace: stack);
    return true;
  };

  await filesystem.init();

  if (!kDebugMode) {
    await BackgroundFetch.registerHeadlessTask(backgroundFetch);
  }

  if (kDebugMode) {
    final serviceProtocolInfo = await Service.getInfo();
    logger.d('VM: ${serviceProtocolInfo.serverUri}');
  }

  //Ensure everything is ready
  await Future.delayed(Duration.zero);

  GeckoLoggingService.setUp((level, message) {
    logger.log(switch (level) {
      LogLevel.debug => Level.debug,
      LogLevel.info => Level.info,
      LogLevel.warn => Level.warning,
      LogLevel.error => Level.error,
    }, message);
  });

  await HomeWidget.setAppGroupId('weblibre');

  runApp(
    const ProviderScope(observers: [ErrorObserver()], child: _MainWidget()),
  );
}