import 'package:drift/native.dart';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:melo/library/category_service.dart';
import 'package:melo/library/database.dart';
import 'package:melo/library/library_service.dart';
import 'package:melo/library/playlist_service.dart';
import 'package:melo/main.dart';
import 'package:melo/player/audio_handler.dart';
import 'package:melo/services/baka_auth.dart';
import 'package:melo/services/download_service.dart';
import 'package:melo/services/melo_cloud_service.dart';
import 'package:melo/services/navidrome_service.dart';
import 'package:melo/services/offline_mode.dart';
import 'package:melo/services/sync_service.dart';
import 'package:melo/services/yt_download_service.dart';
import 'package:melo/services/yt_search_service.dart';
import 'package:melo/settings/app_settings.dart';
import 'package:provider/provider.dart';
import 'package:shared_preferences/shared_preferences.dart';

class _MemorySpeicher implements TokenSpeicher {
  final Map<String, String> werte = {};
  @override
  Future<String?> lesen(String key) async => werte[key];
  @override
  Future<void> schreiben(String key, String wert) async => werte[key] = wert;
  @override
  Future<void> loeschen(String key) async => werte.remove(key);
}

void main() {
  setUp(() => SharedPreferences.setMockInitialValues({}));

  testWidgets('Untere Navigation folgt der Referenz-UI: '
      'Meine Musik, Suchen, Download, Favoriten, YT-Suche', (tester) async {
    final db = MeloDb(NativeDatabase.memory());
    final lib = LibraryService(db);
    final playlists = PlaylistService(db);
    final handler = MeloAudioHandler(db: db);
    final auth = BakaAuth(speicher: _MemorySpeicher());

    await tester.pumpWidget(MultiProvider(
      providers: [
        Provider<MeloDb>.value(value: db),
        ChangeNotifierProvider<LibraryService>.value(value: lib),
        ChangeNotifierProvider<PlaylistService>.value(value: playlists),
        Provider<MeloAudioHandler>.value(value: handler),
        ChangeNotifierProvider<CategoryService>(create: (_) => CategoryService(db)),
        ChangeNotifierProvider<AppSettings>(create: (_) => AppSettings()),
        ChangeNotifierProvider<OfflineMode>(create: (_) => OfflineMode()),
        ChangeNotifierProvider<BakaAuth>(create: (_) => auth),
        ChangeNotifierProvider<YtDownloadService>(
            create: (_) => YtDownloadService(auth: auth)),
        ChangeNotifierProvider<YtSearchService>(
            create: (_) => YtSearchService(auth: auth)),
        ChangeNotifierProvider<DownloadService>(
            create: (_) => DownloadService(db: db, navidrome: NavidromeService())),
        ChangeNotifierProvider<SyncService>(
            create: (_) => SyncService(
                db: db, cloud: MeloCloudService(auth: auth))),
      ],
      child: const MaterialApp(home: HomeShell()),
    ));
    await tester.pump();

    final bar = tester.widget<BottomNavigationBar>(
        find.byType(BottomNavigationBar));
    expect(bar.items.map((i) => i.label).toList(),
        ['Meine Musik', 'Suchen', 'Download', 'Favoriten', 'YT-Suche']);

    handler.dispose();
    await db.close();
  });

  testWidgets('Zurück-Geste auf einem Nicht-Start-Tab wechselt zu '
      '"Meine Musik" statt die App zu minimieren', (tester) async {
    final db = MeloDb(NativeDatabase.memory());
    final lib = LibraryService(db);
    final playlists = PlaylistService(db);
    final handler = MeloAudioHandler(db: db);
    final auth = BakaAuth(speicher: _MemorySpeicher());

    await tester.pumpWidget(MultiProvider(
      providers: [
        Provider<MeloDb>.value(value: db),
        ChangeNotifierProvider<LibraryService>.value(value: lib),
        ChangeNotifierProvider<PlaylistService>.value(value: playlists),
        Provider<MeloAudioHandler>.value(value: handler),
        ChangeNotifierProvider<CategoryService>(create: (_) => CategoryService(db)),
        ChangeNotifierProvider<AppSettings>(create: (_) => AppSettings()),
        ChangeNotifierProvider<OfflineMode>(create: (_) => OfflineMode()),
        ChangeNotifierProvider<BakaAuth>(create: (_) => auth),
        ChangeNotifierProvider<YtDownloadService>(
            create: (_) => YtDownloadService(auth: auth)),
        ChangeNotifierProvider<YtSearchService>(
            create: (_) => YtSearchService(auth: auth)),
        ChangeNotifierProvider<DownloadService>(
            create: (_) => DownloadService(db: db, navidrome: NavidromeService())),
        ChangeNotifierProvider<SyncService>(
            create: (_) => SyncService(
                db: db, cloud: MeloCloudService(auth: auth))),
      ],
      child: const MaterialApp(home: HomeShell()),
    ));
    await tester.pump();

    // Auf "Favoriten" wechseln (Index 3) — kein Navigator.push, nur der Tab.
    await tester.tap(find.descendant(
        of: find.byType(BottomNavigationBar), matching: find.text('Favoriten')));
    await tester.pump();
    expect(
        tester
            .widget<BottomNavigationBar>(find.byType(BottomNavigationBar))
            .currentIndex,
        3);

    // System-Zurück-Geste simulieren — derselbe Weg, über den auch das
    // echte Android-Zurück-Gesten-Signal bei WidgetsApp ankommt.
    final widgetsAppState = tester.state(find.byType(WidgetsApp));
    // ignore: avoid_dynamic_calls
    await (widgetsAppState as dynamic).didPopRoute();
    await tester.pump();

    // Ohne Abfangen bliebe der Tab unverändert (Flutter minimiert dann die
    // App statt zu navigieren) — die Geste muss stattdessen zu Tab 0 führen.
    expect(
        tester
            .widget<BottomNavigationBar>(find.byType(BottomNavigationBar))
            .currentIndex,
        0);

    // Baum abbauen, bevor der Test endet: der Positions-Timer des Audio-
    // Handlers läuft sonst über das Testende hinaus weiter, und der
    // Test-Rahmen meldet einen offenen Timer (wie in hauptmenue_test.dart
    // dokumentiert). Aus demselben Grund bewusst kein db.close() nach
    // einem tester.tap.
    await tester.pumpWidget(const SizedBox());
    handler.dispose();
    await tester.pump(const Duration(milliseconds: 1));
  });
}