67 lines
2.3 KiB
Kotlin
67 lines
2.3 KiB
Kotlin
package com.github.apognu.otter.viewmodels
|
|
|
|
import androidx.lifecycle.*
|
|
import com.github.apognu.otter.Otter
|
|
import com.github.apognu.otter.models.domain.Track
|
|
import com.github.apognu.otter.utils.maybeNormalizeUrl
|
|
import kotlinx.coroutines.delay
|
|
|
|
class TracksViewModel(private val albumId: Int) : ViewModel() {
|
|
private val _cached = liveData {
|
|
while (true) {
|
|
emit(Otter.get().exoCache.keys)
|
|
delay(5000)
|
|
}
|
|
}
|
|
|
|
private val _current = PlayerStateViewModel.get().track
|
|
|
|
private val _tracks: LiveData<List<Track>> by lazy {
|
|
Transformations.map(Otter.get().database.tracks().ofAlbumsDecorated(listOf(albumId))) {
|
|
it.map { track -> Track.fromDecoratedEntity(track) }
|
|
}
|
|
}
|
|
|
|
private val _favorites: LiveData<List<Track>> by lazy {
|
|
Transformations.map(Otter.get().database.tracks().favorites()) {
|
|
it.map { track -> Track.fromDecoratedEntity(track) }
|
|
}
|
|
}
|
|
|
|
val tracks = MediatorLiveData<List<Track>>().apply {
|
|
addSource(_tracks) { mergeTracks(_tracks, _current, _cached) }
|
|
addSource(_current) { mergeTracks(_tracks, _current, _cached) }
|
|
addSource(_cached) { mergeTracks(_tracks, _current, _cached) }
|
|
}
|
|
|
|
val favorites = MediatorLiveData<List<Track>>().apply {
|
|
addSource(_favorites) { mergeFavorites(_favorites, _current, _cached) }
|
|
addSource(_current) { mergeFavorites(_favorites, _current, _cached) }
|
|
addSource(_cached) { mergeFavorites(_favorites, _current, _cached) }
|
|
}
|
|
|
|
private fun mergeTracks(_tracks: LiveData<List<Track>>, _current: LiveData<Track>, _cached: LiveData<Set<String>>) {
|
|
tracks.value = merge(_tracks, _current, _cached) ?: return
|
|
}
|
|
|
|
private fun mergeFavorites(_tracks: LiveData<List<Track>>, _current: LiveData<Track>, _cached: LiveData<Set<String>>) {
|
|
favorites.value = merge(_tracks, _current, _cached) ?: return
|
|
}
|
|
|
|
private fun merge(_tracks: LiveData<List<Track>>, _current: LiveData<Track>, _cached: LiveData<Set<String>>): List<Track>? {
|
|
val _tracks = _tracks.value
|
|
val _current = _current.value
|
|
val _cached = _cached.value
|
|
|
|
if (_tracks == null || _cached == null) {
|
|
return null
|
|
}
|
|
|
|
return _tracks.map { track ->
|
|
track.current = _current?.id == track.id
|
|
track.cached = _cached.contains(maybeNormalizeUrl(track.bestUpload()?.listen_url))
|
|
track
|
|
}
|
|
}
|
|
}
|