solid

solid-1.dart

// Player

// Objetivo: Tocar musicas em mais de uma fonte (Spotify e Dezer)

// Construir as classes baseado no principio SOLID e CLEAN para esse player

// 1) search music by artist
// 2) search music by id
// 3) play music
// 4) pause music
// 5) continue music

// 1) Entity
// 2) UseCase
// 3) Repo
// 4) DataSource
// 5) Implementation

////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////

// 1 - Entity

abstract class Music {}

class MusicEntity implements Music {
  final String id;
  final String name;
  final String artist;
  final String album;
  final String url;

  MusicEntity({
    required this.id,
    required this.name,
    required this.artist,
    required this.album,
    required this.url,
  });
}

////////////////////////////////////////////////////////////////////////////////

// 2 - UseCase

abstract class MusicUseCase {
  Future<List<Music>> searchMusicByArtist(String artist);
  Future<Music> searchMusicById(String id);
  Future<void> playMusic(Music music);
  Future<void> pauseMusic();
  Future<void> continueMusic();
}

////////////////////////////////////////////////////////////////////////////////

// 3 - Repository

abstract class MusicRepository {
  Future<List<Music>> searchMusicByArtist(String artist);
  Future<Music> searchMusicById(String id);
  Future<void> playMusic(Music music);
  Future<void> pauseMusic();
  Future<void> continueMusic();
}

////////////////////////////////////////////////////////////////////////////////

// 4 - DataSource

abstract class MusicDataSource {
  Future<List<Music>> searchMusicByArtist(String artist);
  Future<Music> searchMusicById(String id);
  Future<void> playMusic(Music music);
  Future<void> pauseMusic();
  Future<void> continueMusic();
}

////////////////////////////////////////////////////////////////////////////////

// 5 - Implementation

class MusicUseCaseImpl implements MusicUseCase {
  final MusicRepositoryImpl _repository;

  MusicUseCaseImpl({
    required MusicRepositoryImpl repository,
  }) : _repository = repository;

  @override
  Future<List<Music>> searchMusicByArtist(String artist) async {
    return await _repository.searchMusicByArtist(artist);
  }

  @override
  Future<Music> searchMusicById(String id) async {
    return await _repository.searchMusicById(id);
  }

  @override
  Future<void> playMusic(Music music) async {
    return await _repository.playMusic(music);
  }

  @override
  Future<void> pauseMusic() async {
    return await _repository.pauseMusic();
  }

  @override
  Future<void> continueMusic() async {
    return await _repository.continueMusic();
  }
}

abstract class MusicDataSourceImpl implements MusicDataSource {
  final MusicDataSourceImpl _dataSource;

  MusicDataSourceImpl({
    required MusicDataSourceImpl dataSource,
  }) : _dataSource = dataSource;

  @override
  Future<List<Music>> searchMusicByArtist(String artist) async {
    return await _dataSource.searchMusicByArtist(artist);
  }

  @override
  Future<Music> searchMusicById(String id) async {
    return await _dataSource.searchMusicById(id);
  }

  @override
  Future<void> playMusic(Music music) async {
    return await _dataSource.playMusic(music);
  }

  @override
  Future<void> pauseMusic() async {
    return await _dataSource.pauseMusic();
  }

  @override
  Future<void> continueMusic() async {
    return await _dataSource.continueMusic();
  }
}

abstract class MusicRepositoryImpl implements MusicRepository {
  final MusicDataSourceImpl _dataSource;

  MusicRepositoryImpl({
    required MusicDataSourceImpl dataSource,
  }) : _dataSource = dataSource;

  @override
  Future<List<Music>> searchMusicByArtist(String artist) async {
    return await _dataSource.searchMusicByArtist(artist);
  }

  @override
  Future<Music> searchMusicById(String id) async {
    return await _dataSource.searchMusicById(id);
  }

  @override
  Future<void> playMusic(Music music) async {
    return await _dataSource.playMusic(music);
  }

  @override
  Future<void> pauseMusic() async {
    return await _dataSource.pauseMusic();
  }

  @override
  Future<void> continueMusic() async {
    return await _dataSource.continueMusic();
  }
}