import 'package:flutter_test/flutter_test.dart';
import 'package:melo/library/categories.dart';
import 'package:melo/library/database.dart';

Song _song(String id, {String? coverPath, String title = 'T'}) => Song(
      id: id,
      path: '/$id.mp3',
      title: title,
      dateAddedMs: 0,
      updatedAtMs: 0,
      deleted: false,
      playCount: 0,
      coverPath: coverPath,
      categoriesEdited: false,
      metadataEdited: false,
    );

void main() {
  group('parseCategories', () {
    test('trennt an Semikolon, Komma, Schrägstrich und Pipe', () {
      expect(parseCategories('Rock; Pop'), ['Rock', 'Pop']);
      expect(parseCategories('Rock,Pop'), ['Rock', 'Pop']);
      expect(parseCategories('Rock/Pop'), ['Rock', 'Pop']);
      expect(parseCategories('Rock|Pop'), ['Rock', 'Pop']);
    });

    test('behält Leerzeichen innerhalb einer Kategorie', () {
      expect(parseCategories('Hip Hop; Trap cool'), ['Hip Hop', 'Trap cool']);
    });

    test('entfernt Leereinträge und doppelte Kategorien', () {
      expect(parseCategories('Rock;;rock; Pop ;Rock'), ['Rock', 'Pop']);
    });

    test('leerer oder fehlender Tag ergibt keine Kategorie', () {
      expect(parseCategories(null), isEmpty);
      expect(parseCategories('   '), isEmpty);
    });

    test('verarbeitet auch eine Liste aus mehreren Tag-Feldern', () {
      expect(parseCategoryList(['Rock', 'Pop;Trap', 'rock']),
          ['Rock', 'Pop', 'Trap']);
    });
  });

  group('categoryCovers', () {
    test('nimmt je Kategorie das erste vorhandene Cover', () {
      final songs = [
        _song('1', title: 'A', coverPath: null),
        _song('2', title: 'B', coverPath: '/cover_b.img'),
        _song('3', title: 'C', coverPath: '/cover_c.img'),
      ];
      final categories = {
        '1': ['Rock'],
        '2': ['Rock'],
        '3': ['Pop'],
      };

      final covers = categoryCovers(songs, categories);

      expect(covers['Rock'], '/cover_b.img');
      expect(covers['Pop'], '/cover_c.img');
    });

    test('Kategorie ganz ohne Cover taucht nicht auf', () {
      final songs = [_song('1', coverPath: null)];

      final covers = categoryCovers(songs, {'1': ['Leer']});

      expect(covers.containsKey('Leer'), isFalse);
    });

    test('ist unabhängig von der Reihenfolge der Eingabeliste', () {
      final songs = [
        _song('2', title: 'B', coverPath: '/cover_b.img'),
        _song('1', title: 'A', coverPath: '/cover_a.img'),
      ];
      final categories = {'1': ['Rock'], '2': ['Rock']};

      expect(categoryCovers(songs, categories)['Rock'], '/cover_a.img');
    });
  });

  group('effectiveCover', () {
    final covers = {'Rock': '/rock.img', 'Pop': '/pop.img'};

    test('nimmt das Cover der ersten Kategorie', () {
      final cover = effectiveCover(
        _song('1', coverPath: '/eigen.img'),
        ['Pop', 'Rock'],
        covers,
        groupByCategory: true,
      );

      expect(cover, '/pop.img');
    });

    test('fällt auf das eigene Cover zurück, wenn die Kategorie keins hat', () {
      final cover = effectiveCover(
        _song('1', coverPath: '/eigen.img'),
        ['Unbekannt'],
        covers,
        groupByCategory: true,
      );

      expect(cover, '/eigen.img');
    });

    test('abgeschaltet gilt immer das eigene Cover', () {
      final cover = effectiveCover(
        _song('1', coverPath: '/eigen.img'),
        ['Pop'],
        covers,
        groupByCategory: false,
      );

      expect(cover, '/eigen.img');
    });

    test('ohne Kategorien gilt das eigene Cover', () {
      final cover = effectiveCover(
        _song('1', coverPath: '/eigen.img'),
        const [],
        covers,
        groupByCategory: true,
      );

      expect(cover, '/eigen.img');
    });
  });
}