// test/metadata_normalizer_test.dart
import 'package:flutter_test/flutter_test.dart';
import 'package:qingting_player/metadata/metadata_model.dart';
import 'package:qingting_player/metadata/metadata_normalizer.dart';

void main() {
  final normalizer = MetadataNormalizer();

  RawMetadata raw({
    String title = '',
    String artist = '',
    String album = '',
    int year = 0,
  }) =>
      RawMetadata(title: title, artist: artist, album: album, year: year);

  group('normalize 字段来源', () {
    test('标签齐全时三个字段都标记为来自标签', () {
      final n = normalizer.normalize(
        raw(title: '夜曲', artist: '周杰伦', album: '十一月的萧邦'),
        fileName: 'track01.mp3',
        filePath: '/音乐/周杰伦/track01.mp3',
      );
      expect(n.title, '夜曲');
      expect(n.artist, '周杰伦');
      expect(n.album, '十一月的萧邦');
      expect(n.titleFromTag, isTrue);
      expect(n.artistFromTag, isTrue);
      expect(n.albumFromTag, isTrue);
    });

    test('没有标签时回退到文件名与目录', () {
      final n = normalizer.normalize(
        raw(),
        fileName: '晴天.mp3',
        filePath: '/音乐/周杰伦/晴天.mp3',
      );
      expect(n.title, '晴天');
      expect(n.artist, '周杰伦');
      expect(n.titleFromTag, isFalse);
      expect(n.artistFromTag, isFalse);
    });
  });

  group('evaluate 置信度分级', () {
    NormalizedMetadata norm({
      required String title,
      required String artist,
      String album = '',
      bool titleTag = true,
      bool artistTag = true,
      bool albumTag = false,
    }) =>
        NormalizedMetadata(
          title: title,
          artist: artist,
          album: album,
          titleFromTag: titleTag,
          artistFromTag: artistTag,
          albumFromTag: albumTag,
        );

    test('标题 + 艺术家 + 专辑 → 0.90', () {
      final c = normalizer.evaluate(
        norm(title: '夜曲', artist: '周杰伦', album: '十一月的萧邦', albumTag: true),
        const [],
      );
      expect(c.confidence, closeTo(0.90, 0.001));
    });

    test('只有标题和艺术家 → 0.80', () {
      final c = normalizer.evaluate(norm(title: '夜曲', artist: '周杰伦'), const []);
      expect(c.confidence, closeTo(0.80, 0.001));
    });

    test('只有文件名（无标签）→ 0.35，低于阈值', () {
      final c = normalizer.evaluate(
        norm(title: 'track01', artist: '未知艺术家', titleTag: false, artistTag: false),
        const [],
      );
      expect(c.confidence, closeTo(0.35, 0.001));
      expect(c.confidence < 0.6, isTrue);
    });

    test('历史一致性加权：同艺人 ≥2 条 → +0.05', () {
      final history = [
        {'artist': '周杰伦', 'album': ''},
        {'artist': '周杰伦', 'album': ''},
      ];
      final c = normalizer.evaluate(
        norm(title: '夜曲', artist: '周杰伦'),
        history,
      );
      expect(c.confidence, closeTo(0.85, 0.001));
      expect(c.evidence['artist_history'], 0.05);
    });

    test('证据可解释：每一项加分都有记录', () {
      final c = normalizer.evaluate(
        norm(title: '夜曲', artist: '周杰伦', album: '十一月的萧邦', albumTag: true),
        const [],
      );
      expect(c.evidence.containsKey('base'), isTrue);
      expect(c.evidence.containsKey('title_from_tag'), isTrue);
      expect(c.evidence.containsKey('artist_from_tag'), isTrue);
      expect(c.evidence.containsKey('album'), isTrue);
    });
  });

  group('decide 阈值', () {
    test('高于阈值时 source=normalized', () {
      final c = normalizer.evaluate(
        const NormalizedMetadata(
          title: '夜曲',
          artist: '周杰伦',
          titleFromTag: true,
          artistFromTag: true,
        ),
        const [],
      );
      final f = normalizer.decide(c);
      expect(f.source, 'normalized');
      expect(f.title, '夜曲');
    });

    test('低于阈值时 source=pending', () {
      final c = normalizer.evaluate(
        const NormalizedMetadata(
          title: 'track01',
          artist: '未知艺术家',
          titleFromTag: false,
          artistFromTag: false,
        ),
        const [],
      );
      final f = normalizer.decide(c);
      expect(f.source, 'pending');
    });
  });
}