import 'dart:async';

import 'package:audio_service/audio_service.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:spotiflac_android/controllers/player_metadata_controller.dart';

MediaItem _item(
  String id, {
  String? source,
  String? resolved,
  Map<String, dynamic> metadata = const {},
}) => MediaItem(
  id: id,
  title: id,
  artist: 'Artist',
  album: 'Album',
  extras: {
    'source': source ?? '/music/$id.flac',
    'resolvedSource': ?resolved,
    ...metadata,
  },
);

void main() {
  test('late result cannot overwrite a track switched away and back', () async {
    final reads = <Completer<Map<String, dynamic>>>[];
    final controller = PlayerMetadataController(
      readMetadata: (_) {
        final read = Completer<Map<String, dynamic>>();
        reads.add(read);
        return read.future;
      },
    );
    addTearDown(controller.dispose);
    final first = controller.load(_item('a'));
    final second = controller.load(_item('b'));
    final current = controller.load(_item('a'));

    reads[2].complete({'lyrics': '[00:01.00]Current A'});
    await current;
    reads[0].complete({'lyrics': '[00:01.00]Old A'});
    reads[1].completeError(StateError('Old B failed'));
    await Future.wait([first, second]);

    expect(controller.lyrics.lines.single.text, 'Current A');
    expect(controller.loading, isFalse);
  });

  test('resolved source supersedes an outstanding content URI read', () async {
    final old = Completer<Map<String, dynamic>>();
    final paths = <String>[];
    final controller = PlayerMetadataController(
      readMetadata: (path) {
        paths.add(path);
        return path.startsWith('content://')
            ? old.future
            : Future.value({'lyrics': '[00:01.00]Resolved'});
      },
    );
    addTearDown(controller.dispose);
    final source = 'content://library/song.flac';
    final pending = controller.load(
      _item('a', source: source),
      inspectUnresolvedContentUri: true,
    );
    await controller.load(
      _item('a', source: source, resolved: '/tmp/song.flac'),
    );
    old.complete({'lyrics': '[00:01.00]Unresolved'});
    await pending;

    expect(paths, [source, '/tmp/song.flac']);
    expect(controller.lyrics.lines.single.text, 'Resolved');
  });

  test(
    'disposal prevents outstanding reads from notifying or mutating',
    () async {
      final read = Completer<Map<String, dynamic>>();
      final controller = PlayerMetadataController(
        readMetadata: (_) => read.future,
      );
      var notifications = 0;
      controller.addListener(() => notifications++);
      final pending = controller.load(_item('a'));
      final beforeDispose = notifications;
      controller.dispose();
      read.complete({'lyrics': '[00:01.00]Late'});
      await pending;
      await controller.load(_item('b'));

      expect(notifications, beforeDispose);
      expect(controller.lyrics.isEmpty, isTrue);
    },
  );

  test(
    'unresolved SAF metadata stays on demand and reads are deduplicated',
    () async {
      final read = Completer<Map<String, dynamic>>();
      final paths = <String>[];
      final controller = PlayerMetadataController(
        readMetadata: (path) {
          paths.add(path);
          return read.future;
        },
      );
      addTearDown(controller.dispose);
      final item = _item('a', source: 'content://library/a.flac');
      await controller.load(item);
      expect(paths, isEmpty);
      expect(controller.loading, isFalse);
      final pending = controller.load(item, inspectUnresolvedContentUri: true);
      await controller.load(item, inspectUnresolvedContentUri: true);
      expect(paths, [item.extras!['source']]);
      read.complete({'lyrics': '[00:01.00]Embedded'});
      await pending;
      await controller.load(item, inspectUnresolvedContentUri: true);
      expect(paths, hasLength(1));
    },
  );

  test('HTTP quality fallback avoids file probes and old lyrics', () async {
    final paths = <String>[];
    final controller = PlayerMetadataController(
      readMetadata: (path) async {
        paths.add(path);
        return {'lyrics': '[00:01.00]Local'};
      },
    );
    addTearDown(controller.dispose);
    await controller.load(_item('local'));
    final remote = _item(
      'remote',
      source: 'https://audio.test/song.mp3',
      resolved: 'https://cdn.audio.test/song.mp3',
      metadata: {'format': 'mp3', 'bitrate': 320, 'sample_rate': 44100},
    );
    expect((await controller.readDetails(remote))['title'], 'remote');
    await controller.load(remote);
    expect((await controller.readDetails(remote))['format'], 'mp3');

    expect(paths, ['/music/local.flac']);
    expect(controller.lyrics.isEmpty, isTrue);
    expect(controller.qualityLabel, 'MP3  ·  44.1 kHz  ·  320 kbps');
  });

  test(
    'network metadata uses logical source despite playback HTTP URL',
    () async {
      final paths = <String>[];
      final controller = PlayerMetadataController(
        readMetadata: (path) async {
          paths.add(path);
          return {'lyrics': '[00:01.00]Network'};
        },
      );
      addTearDown(controller.dispose);
      await controller.load(
        _item(
          'network',
          source: 'network://library/song.flac',
          resolved: 'http://127.0.0.1/playback',
        ),
      );
      expect(paths, ['network://library/song.flac']);
      expect(controller.lyrics.lines.single.text, 'Network');
    },
  );

  test('failed probes retain quality metadata and may retry', () async {
    var reads = 0;
    final controller = PlayerMetadataController(
      readMetadata: (_) async {
        if (++reads == 1) throw StateError('Temporarily unavailable');
        return {
          'lyrics': '[00:01.00]Recovered',
          'format': '',
          'sample_rate': 0,
          'lyricist': 'Writer',
          'lyrics_provider': 'Provider',
        };
      },
    );
    addTearDown(controller.dispose);
    final item = _item(
      'a',
      metadata: {'format': 'FLAC', 'sample_rate': 48000, 'bit_depth': 24},
    );
    await controller.load(item);
    expect(controller.loading, isFalse);
    expect(controller.qualityLabel, 'FLAC  ·  24-bit  ·  48 kHz');
    await controller.load(item);
    expect(controller.qualityLabel, 'FLAC  ·  24-bit  ·  48 kHz');
    expect(controller.lyrics.lines.single.text, 'Recovered');
    expect(controller.credits, (writers: 'Writer', provider: 'Provider'));
    expect(
      () => controller.metadata!['format'] = 'MP3',
      throwsUnsupportedError,
    );
  });

  test('details snapshot probes SAF without changing lyrics state', () async {
    final controller = PlayerMetadataController(
      readMetadata: (_) async => {
        'title': 'Tagged',
        'lyrics': '[00:01.00]Lyrics',
      },
    );
    addTearDown(controller.dispose);
    final item = _item('a', source: 'content://library/a.flac');
    await controller.load(item);
    final details = await controller.readDetails(item);
    expect(details['title'], 'Tagged');
    expect(details['artist'], 'Artist');
    expect(controller.lyrics.isEmpty, isTrue);
    expect(controller.loading, isFalse);
    await controller.load(null);
    expect(controller.source, isNull);
    expect(controller.metadata, isNull);
  });

  test(
    'failed details retain their snapshot after the track changes',
    () async {
      final read = Completer<Map<String, dynamic>>();
      final controller = PlayerMetadataController(
        readMetadata: (path) => path.startsWith('content://')
            ? read.future
            : Future.value({'lyrics': '[00:01.00]Current'}),
      );
      addTearDown(controller.dispose);
      final item = _item(
        'a',
        source: 'content://library/a.flac',
        metadata: {'format': 'FLAC'},
      );
      await controller.load(item);
      final pending = controller.readDetails(item);
      await controller.load(_item('b'));
      read.completeError(StateError('File unavailable'));

      expect(await pending, {
        'title': 'a',
        'artist': 'Artist',
        'album': 'Album',
        'format': 'FLAC',
      });
      expect(controller.lyrics.lines.single.text, 'Current');
    },
  );
}