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fix: fix filtering tracks by a release
fixes #353
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David Ly
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Aug 16, 2023
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106 changes: 106 additions & 0 deletions
106
app/src/main/java/ly/david/mbjc/ui/release/tracks/TracksByReleaseViewModel.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| package ly.david.mbjc.ui.release.tracks | ||
|
|
||
| import androidx.lifecycle.ViewModel | ||
| import androidx.lifecycle.viewModelScope | ||
| import androidx.paging.ExperimentalPagingApi | ||
| import androidx.paging.Pager | ||
| import androidx.paging.PagingData | ||
| import androidx.paging.cachedIn | ||
| import androidx.paging.insertSeparators | ||
| import androidx.paging.map | ||
| import dagger.hilt.android.lifecycle.HiltViewModel | ||
| import javax.inject.Inject | ||
| import kotlinx.coroutines.ExperimentalCoroutinesApi | ||
| import kotlinx.coroutines.flow.Flow | ||
| import kotlinx.coroutines.flow.MutableStateFlow | ||
| import kotlinx.coroutines.flow.combine | ||
| import kotlinx.coroutines.flow.distinctUntilChanged | ||
| import kotlinx.coroutines.flow.filterNot | ||
| import kotlinx.coroutines.flow.flatMapLatest | ||
| import kotlinx.coroutines.flow.map | ||
| import ly.david.data.common.transformThisIfNotNullOrEmpty | ||
| import ly.david.data.domain.listitem.ListItemModel | ||
| import ly.david.data.domain.listitem.ListSeparator | ||
| import ly.david.data.domain.listitem.TrackListItemModel | ||
| import ly.david.data.domain.listitem.toTrackListItemModel | ||
| import ly.david.data.domain.paging.LookupEntityRemoteMediator | ||
| import ly.david.data.domain.paging.MusicBrainzPagingConfig | ||
| import ly.david.data.domain.release.ReleaseRepository | ||
| import ly.david.data.room.release.ReleaseDao | ||
| import ly.david.data.room.release.tracks.MediumDao | ||
| import ly.david.data.room.release.tracks.MediumRoomModel | ||
| import ly.david.data.room.release.tracks.TrackDao | ||
| import ly.david.data.room.release.tracks.TrackForListItem | ||
|
|
||
| @HiltViewModel | ||
| internal class TracksByReleaseViewModel @Inject constructor( | ||
| private val repository: ReleaseRepository, | ||
| private val releaseDao: ReleaseDao, | ||
| private val mediumDao: MediumDao, | ||
| private val trackDao: TrackDao, | ||
| ) : ViewModel() { | ||
|
|
||
| private data class ViewModelState( | ||
| val releaseId: String = "", | ||
| val query: String = "", | ||
| ) | ||
|
|
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| private val releaseId: MutableStateFlow<String> = MutableStateFlow("") | ||
| private val query: MutableStateFlow<String> = MutableStateFlow("") | ||
| private val tracksParamState: Flow<ViewModelState> = combine(releaseId, query) { releaseId, query -> | ||
| ViewModelState(releaseId, query) | ||
| }.distinctUntilChanged() | ||
|
|
||
| fun loadTracks(releaseId: String) { | ||
| this.releaseId.value = releaseId | ||
| } | ||
|
|
||
| fun updateQuery(query: String) { | ||
| this.query.value = query | ||
| } | ||
|
|
||
| @OptIn(ExperimentalCoroutinesApi::class, ExperimentalPagingApi::class) | ||
| val pagedTracks: Flow<PagingData<ListItemModel>> = | ||
| tracksParamState.filterNot { it.releaseId.isEmpty() } | ||
| .flatMapLatest { (releaseId, query) -> | ||
| Pager( | ||
| config = MusicBrainzPagingConfig.pagingConfig, | ||
| remoteMediator = LookupEntityRemoteMediator( | ||
| hasEntityBeenStored = { hasReleaseTracksBeenStored(releaseId) }, | ||
| lookupEntity = { repository.lookupRelease(releaseId) }, | ||
| deleteLocalEntity = { releaseDao.deleteReleaseById(releaseId) } | ||
| ), | ||
| pagingSourceFactory = { | ||
| trackDao.getTracksByRelease( | ||
| releaseId = releaseId, | ||
| query = "%$query%", | ||
| ) | ||
| } | ||
| ).flow.map { pagingData -> | ||
| pagingData | ||
| .map(TrackForListItem::toTrackListItemModel) | ||
| .insertSeparators { before: TrackListItemModel?, after: TrackListItemModel? -> | ||
| if (before?.mediumId != after?.mediumId && after != null) { | ||
| val medium: MediumRoomModel = | ||
| mediumDao.getMediumForTrack(after.id) ?: return@insertSeparators null | ||
|
|
||
| ListSeparator( | ||
| id = "${medium.id}", | ||
| text = medium.format.orEmpty() + | ||
| (medium.position?.toString() ?: "").transformThisIfNotNullOrEmpty { " $it" } + | ||
| medium.title.transformThisIfNotNullOrEmpty { " ($it)" } | ||
| ) | ||
| } else { | ||
| null | ||
| } | ||
| } | ||
| } | ||
| } | ||
| .distinctUntilChanged() | ||
| .cachedIn(viewModelScope) | ||
|
|
||
| private suspend fun hasReleaseTracksBeenStored(releaseId: String): Boolean { | ||
| val roomRelease = releaseDao.getReleaseWithFormatTrackCounts(releaseId) | ||
| return !roomRelease?.formatTrackCounts.isNullOrEmpty() | ||
| } | ||
| } |
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