59 lines
2.0 KiB
Kotlin
59 lines
2.0 KiB
Kotlin
package com.github.apognu.otter.viewmodels
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import androidx.lifecycle.*
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import com.github.apognu.otter.models.domain.Album
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import com.github.apognu.otter.models.domain.Track
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import com.github.apognu.otter.repositories.FavoritesRepository
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import com.github.apognu.otter.repositories.TracksRepository
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import kotlinx.coroutines.delay
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class FavoritesViewModel(private val repository: FavoritesRepository, private val tracksRepository: TracksRepository) : ViewModel() {
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private val _downloaded = liveData {
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while (true) {
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emit(tracksRepository.downloaded())
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delay(5000)
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}
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}
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private val _albums: LiveData<List<Album>> by lazy {
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Transformations.switchMap(_favorites) { tracks ->
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val ids = tracks.mapNotNull { it.album?.id }
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Transformations.map(repository.find(ids)) { albums ->
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albums.map { album -> Album.fromDecoratedEntity(album) }
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}
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}
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}
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private val _favorites: LiveData<List<Track>> by lazy {
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Transformations.switchMap(repository.all()) {
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val ids = it.map { favorite -> favorite.track_id }
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Transformations.map(tracksRepository.find(ids)) { tracks ->
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tracks.map { track -> Track.fromDecoratedEntity(track) }.sortedBy { it.title }
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}
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}
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}
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val favorites = MediatorLiveData<List<Track>>().apply {
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addSource(_favorites) { merge(_favorites, _albums, _downloaded) }
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addSource(_albums) { merge(_favorites, _albums, _downloaded) }
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addSource(_downloaded) { merge(_favorites, _albums, _downloaded) }
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}
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private fun merge(_tracks: LiveData<List<Track>>, _albums: LiveData<List<Album>>, _downloaded: LiveData<List<Int>>) {
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val _tracks = _tracks.value
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val _albums = _albums.value
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val _downloaded = _downloaded.value
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if (_tracks == null || _albums == null || _downloaded == null) {
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return
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}
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favorites.value = _tracks.map { track ->
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track.cached = tracksRepository.isCached(track)
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track.downloaded = _downloaded.contains(track.id)
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track
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}
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}
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} |