tempus/app/src/main/java/com/cappielloantonio/play/viewmodel/LibraryViewModel.java

package com.cappielloantonio.play.viewmodel;

import android.app.Application;

import androidx.annotation.NonNull;
import androidx.lifecycle.AndroidViewModel;
import androidx.lifecycle.LiveData;

import com.cappielloantonio.play.model.Album;
import com.cappielloantonio.play.model.Artist;
import com.cappielloantonio.play.model.Genre;
import com.cappielloantonio.play.model.Playlist;
import com.cappielloantonio.play.repository.AlbumRepository;
import com.cappielloantonio.play.repository.ArtistRepository;
import com.cappielloantonio.play.repository.GenreRepository;
import com.cappielloantonio.play.repository.PlaylistRepository;

import java.util.List;

public class LibraryViewModel extends AndroidViewModel {
    private AlbumRepository albumRepository;
    private ArtistRepository artistRepository;
    private GenreRepository genreRepository;
    private PlaylistRepository playlistRepository;

    private List<Playlist> playlistSample;
    private LiveData<List<Album>> sampleAlbum;
    private LiveData<List<Artist>> sampleArtist;
    private LiveData<List<Genre>> sampleGenres;

    public LibraryViewModel(@NonNull Application application) {
        super(application);

        albumRepository = new AlbumRepository(application);
        artistRepository = new ArtistRepository(application);
        genreRepository = new GenreRepository(application);
        playlistRepository = new PlaylistRepository(application);

        // Inizializzate all'interno del costruttore, in modo da rimanere immutabili per tutto il
        // ciclo di vita dell'applicazione
        // sampleAlbum = albumRepository.getListLiveSampleAlbum();
        // sampleArtist = artistRepository.getListLiveSampleArtist();
        // sampleGenres = genreRepository.getListLiveSampleGenre();
        // playlistSample = playlistRepository.getRandomSample(5);
    }

    public List<Playlist> getPlaylistSample() {
        if (playlistSample.isEmpty()) {
            // playlistSample = playlistRepository.getRandomSample(5);
        }

        return playlistSample;
    }

    public LiveData<List<Album>> getAlbumSample() {
        return sampleAlbum;
    }

    public LiveData<List<Artist>> getArtistSample() {
        return sampleArtist;
    }

    public LiveData<List<Genre>> getGenreSample() {
        return sampleGenres;
    }
}