import 'dart:convert';
import 'dart:io';

import 'package:drift/drift.dart';
import 'package:drift/native.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:path/path.dart' as p;
import 'package:path_provider_platform_interface/path_provider_platform_interface.dart';
import 'package:plezy/database/app_database.dart';
import 'package:plezy/media/media_backend.dart';
import 'package:plezy/media/media_item.dart';
import 'package:plezy/media/media_kind.dart';
import 'package:plezy/media/media_server_client.dart';
import 'package:plezy/models/download_models.dart';
import 'package:plezy/services/cached_playback_metadata_service.dart';
import 'package:plezy/services/download_storage_service.dart';
import 'package:plezy/services/jellyfin_api_cache.dart';
import 'package:plezy/services/jellyfin_media_info_mapper.dart';
import 'package:plezy/services/playback_initialization_service.dart';
import 'package:plezy/services/plex_api_cache.dart';
import 'package:plezy/services/settings_service.dart';
import 'package:plugin_platform_interface/plugin_platform_interface.dart';

import '../test_helpers/prefs.dart';

class _FakePathProvider extends PathProviderPlatform with MockPlatformInterfaceMixin {
  _FakePathProvider(this.root);

  final Directory root;
  String get _docs => p.join(root.path, 'documents');
  String get _support => p.join(root.path, 'support');
  String get _cache => p.join(root.path, 'cache');
  String get _temp => p.join(root.path, 'temp');

  @override
  Future<String?> getApplicationDocumentsPath() async => _ensure(_docs);

  @override
  Future<String?> getApplicationSupportPath() async => _ensure(_support);

  @override
  Future<String?> getApplicationCachePath() async => _ensure(_cache);

  @override
  Future<String?> getTemporaryPath() async => _ensure(_temp);

  String _ensure(String dir) {
    Directory(dir).createSync(recursive: true);
    return dir;
  }
}

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  late AppDatabase db;
  late Directory tmpRoot;

  setUp(() async {
    resetSharedPreferencesForTest();
    SettingsService.resetForTesting();
    DownloadStorageService.resetForTesting();
    tmpRoot = await Directory.systemTemp.createTemp('playback_init_test_');
    PathProviderPlatform.instance = _FakePathProvider(tmpRoot);
    db = AppDatabase.forTesting(NativeDatabase.memory());
    PlexApiCache.initialize(db);
    JellyfinApiCache.initialize(db);
  });

  tearDown(() async {
    await db.close();
    DownloadStorageService.resetForTesting();
    SettingsService.resetForTesting();
    if (await tmpRoot.exists()) {
      await tmpRoot.delete(recursive: true);
    }
  });

  test('pure-offline playback loads cached Plex media source info without a client', () async {
    await _insertDownloaded(db, serverId: 'srv-1', ratingKey: 'movie-1', videoFilePath: 'content://offline/movie-1');
    await PlexApiCache.instance.put('srv-1', '/library/metadata/movie-1', _plexMetadataEnvelope());

    final result = await PlaybackInitializationService(database: db).getPlaybackData(
      metadata: MediaItem(id: 'movie-1', backend: MediaBackend.plex, kind: MediaKind.movie, serverId: 'srv-1'),
      selectedMediaIndex: 0,
      preferOffline: true,
    );

    expect(result.isOffline, isTrue);
    expect(result.videoUrl, 'content://offline/movie-1');
    expect(result.mediaInfo?.audioTracks.single.languageCode, 'eng');
  });

  test('preferOffline uses cache without calling live client when local file exists', () async {
    await _insertDownloaded(db, serverId: 'srv-1', ratingKey: 'movie-1', videoFilePath: 'content://offline/movie-1');
    await PlexApiCache.instance.put('srv-1', '/library/metadata/movie-1', _plexMetadataEnvelope());
    final client = _FailingPlaybackClient(serverId: 'srv-1');

    final result = await PlaybackInitializationService(client: client, database: db).getPlaybackData(
      metadata: MediaItem(id: 'movie-1', backend: MediaBackend.plex, kind: MediaKind.movie, serverId: 'srv-1'),
      selectedMediaIndex: 0,
      preferOffline: true,
    );

    expect(client.playbackInitializationCalls, 0);
    expect(result.isOffline, isTrue);
    expect(result.videoUrl, 'content://offline/movie-1');
    expect(result.availableVersions, isEmpty);
    expect(result.mediaInfo?.audioTracks.single.languageCode, 'eng');
  });

  test('pure-offline playback uses cached Plex media source for selected version', () async {
    await _insertDownloaded(
      db,
      serverId: 'srv-1',
      ratingKey: 'movie-1',
      videoFilePath: 'content://offline/movie-1-v2',
      mediaIndex: 1,
    );
    await PlexApiCache.instance.put(
      'srv-1',
      '/library/metadata/movie-1',
      _plexMetadataEnvelope(includeSecondVersion: true),
    );

    final result = await PlaybackInitializationService(database: db).getPlaybackData(
      metadata: MediaItem(id: 'movie-1', backend: MediaBackend.plex, kind: MediaKind.movie, serverId: 'srv-1'),
      selectedMediaIndex: 1,
      preferOffline: true,
    );

    expect(result.videoUrl, 'content://offline/movie-1-v2');
    expect(result.mediaInfo?.audioTracks.single.languageCode, 'fre');
  });

  test('pure-offline Jellyfin cache works without a connection row', () async {
    await _insertDownloaded(
      db,
      serverId: 'jf-machine',
      clientScopeId: 'jf-machine/user-a',
      ratingKey: 'item-1',
      videoFilePath: 'content://offline/jf-item-1',
    );
    await db
        .into(db.apiCache)
        .insert(
          ApiCacheCompanion.insert(
            cacheKey: 'jf-machine/user-a:/Users/user-a/Items/item-1',
            data: jsonEncode(_jellyfinItemRaw()),
            pinned: const Value(true),
          ),
        );

    final result = await PlaybackInitializationService(database: db).getPlaybackData(
      metadata: MediaItem(id: 'item-1', backend: MediaBackend.jellyfin, kind: MediaKind.movie, serverId: 'jf-machine'),
      selectedMediaIndex: 0,
      preferOffline: true,
    );

    expect(result.videoUrl, 'content://offline/jf-item-1');
    expect(result.mediaInfo?.audioTracks.single.languageCode, 'eng');
    expect(result.mediaInfo?.chapters.single.title, 'Chapter 1');
  });

  test('SAF offline playback discovers app-managed sidecar subtitles', () async {
    await _insertDownloaded(db, serverId: 'srv-1', ratingKey: 'movie-1', videoFilePath: 'content://offline/movie-1');
    final subtitlePath = await DownloadStorageService.instance.getSubtitlePath('srv-1', 'movie-1', 2, 'srt');
    final subtitleFile = File(subtitlePath);
    await subtitleFile.parent.create(recursive: true);
    await subtitleFile.writeAsString('1\n00:00:00,000 --> 00:00:01,000\nHello');

    final result = await PlaybackInitializationService(database: db).getPlaybackData(
      metadata: MediaItem(id: 'movie-1', backend: MediaBackend.plex, kind: MediaKind.movie, serverId: 'srv-1'),
      selectedMediaIndex: 0,
      preferOffline: true,
    );

    expect(result.videoUrl, 'content://offline/movie-1');
    expect(result.externalSubtitles, hasLength(1));
    expect(result.externalSubtitles.single.uri, Uri.file(subtitlePath).toString());
  });

  test('cache-only playback extras parses Plex chapters and markers', () async {
    await PlexApiCache.instance.put('srv-1', '/library/metadata/movie-1', _plexMetadataEnvelope());

    final extras = await CachedPlaybackMetadataService.fetchPlaybackExtras(
      backend: MediaBackend.plex,
      cacheServerId: 'srv-1',
      itemId: 'movie-1',
    );

    expect(extras?.chapters.single.title, 'Intro');
    expect(extras?.markers.single.type, 'credits');
  });

  test('Plex extras parser skips malformed entries and keeps valid ones', () async {
    await PlexApiCache.instance.put('srv-1', '/library/metadata/movie-1', _plexMetadataEnvelope(malformedExtras: true));

    final extras = await CachedPlaybackMetadataService.fetchPlaybackExtras(
      backend: MediaBackend.plex,
      cacheServerId: 'srv-1',
      itemId: 'movie-1',
    );

    expect(extras?.chapters.map((c) => c.title), ['Intro']);
    expect(extras?.markers.map((m) => m.type), ['credits']);
  });

  test('Jellyfin extras parser tolerates non-string chapter names', () {
    final extras = jellyfinPlaybackExtrasFromRaw({
      'Chapters': [
        {'Name': 123, 'StartPositionTicks': 10000000},
      ],
    }, 'item-1');

    expect(extras.chapters.single.title, '123');
  });
}

class _FailingPlaybackClient implements MediaServerClient {
  _FailingPlaybackClient({required this.serverId});

  @override
  final String serverId;

  int playbackInitializationCalls = 0;

  @override
  Future<PlaybackInitializationResult> getPlaybackInitialization(PlaybackInitializationOptions options) async {
    playbackInitializationCalls++;
    throw StateError('live playback initialization should not be called for downloaded playback');
  }

  @override
  dynamic noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
}

Future<void> _insertDownloaded(
  AppDatabase db, {
  required String serverId,
  String? clientScopeId,
  required String ratingKey,
  required String videoFilePath,
  int mediaIndex = 0,
}) async {
  await db
      .into(db.downloadedMedia)
      .insert(
        DownloadedMediaCompanion.insert(
          serverId: serverId,
          clientScopeId: Value(clientScopeId),
          ratingKey: ratingKey,
          globalKey: '$serverId:$ratingKey',
          type: 'movie',
          status: DownloadStatus.completed.index,
          videoFilePath: Value(videoFilePath),
          mediaIndex: Value(mediaIndex),
        ),
      );
}

Map<String, dynamic> _plexMetadataEnvelope({bool includeSecondVersion = false, bool malformedExtras = false}) {
  final chapters = <Map<String, dynamic>>[
    if (malformedExtras) {'id': 'bad'},
    {'id': 1, 'index': 0, 'startTimeOffset': 0, 'endTimeOffset': 10000, 'tag': 'Intro'},
  ];
  final markers = <Map<String, dynamic>>[
    if (malformedExtras) {'id': 99, 'type': 'broken'},
    {'id': 2, 'type': 'credits', 'startTimeOffset': 90000, 'endTimeOffset': 100000},
  ];
  final media = <Map<String, dynamic>>[
    _plexMediaWithAudio('English', 'eng'),
    if (includeSecondVersion) _plexMediaWithAudio('French', 'fre'),
  ];
  return {
    'MediaContainer': {
      'Metadata': [
        {
          'ratingKey': 'movie-1',
          'type': 'movie',
          'title': 'Movie',
          'Chapter': chapters,
          'Marker': markers,
          'Media': media,
        },
      ],
    },
  };
}

Map<String, dynamic> _plexMediaWithAudio(String language, String languageCode) {
  return {
    'Part': [
      {
        'Stream': [
          {'id': 10, 'streamType': 2, 'index': 1, 'language': language, 'languageCode': languageCode},
        ],
      },
    ],
  };
}

Map<String, dynamic> _jellyfinItemRaw() {
  return {
    'Id': 'item-1',
    'Type': 'Movie',
    'Name': 'Jellyfin Movie',
    'Chapters': [
      {'Name': 'Chapter 1', 'StartPositionTicks': 0},
    ],
    'MediaSources': [
      {
        'Id': 'src-1',
        'MediaStreams': [
          {'Type': 'Audio', 'Index': 1, 'Language': 'eng', 'DisplayLanguage': 'English', 'IsDefault': true},
        ],
      },
    ],
  };
}