music: connect playlist importing to frontend

app/src/main/java/org/oxycblt/auxio/music/MusicViewModel.kt

@@ -18,6 +18,7 @@
  
 package org.oxycblt.auxio.music
 
+import android.net.Uri
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import dagger.hilt.android.lifecycle.HiltViewModel
@@ -27,6 +28,7 @@ import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.launch
 import org.oxycblt.auxio.list.ListSettings
+import org.oxycblt.auxio.music.import.PlaylistImporter
 import org.oxycblt.auxio.util.Event
 import org.oxycblt.auxio.util.MutableEvent
 import org.oxycblt.auxio.util.logD
@@ -42,6 +44,7 @@ class MusicViewModel
 constructor(
     private val listSettings: ListSettings,
     private val musicRepository: MusicRepository,
+    private val playlistImporter: PlaylistImporter
 ) : ViewModel(), MusicRepository.UpdateListener, MusicRepository.IndexingListener {
 
     private val _indexingState = MutableStateFlow<IndexingState?>(null)
@@ -61,6 +64,10 @@ constructor(
     val playlistDecision: Event<PlaylistDecision>
         get() = _playlistDecision
 
+    private val _importError = MutableEvent<Unit>()
+    /** Flag for when playlist importing failed. Consume this and show an error if active. */
+    val importError: Event<Unit> get() = _importError
+
     init {
         musicRepository.addUpdateListener(this)
         musicRepository.addIndexingListener(this)
@@ -116,6 +123,25 @@ constructor(
         }
     }
 
+    /**
+     * Import a playlist from a file [Uri]. Errors pushed to [importError].
+     * @param uri The [Uri] of the file to import.
+     * @see PlaylistImporter
+     */
+    fun importPlaylist(uri: Uri) =
+        viewModelScope.launch(Dispatchers.IO) {
+            val importedPlaylist = playlistImporter.import(uri)
+            if (importedPlaylist == null) {
+                _importError.put(Unit)
+                return@launch
+            }
+
+            val deviceLibrary = musicRepository.deviceLibrary ?: return@launch
+            val songs = importedPlaylist.paths.mapNotNull(deviceLibrary::findSongByPath)
+
+            createPlaylist(importedPlaylist.name, songs)
+        }
+
     /**
      * Rename the given playlist.
      *

app/src/main/java/org/oxycblt/auxio/music/device/DeviceLibrary.kt

@@ -29,6 +29,7 @@ import org.oxycblt.auxio.music.Genre
 import org.oxycblt.auxio.music.Music
 import org.oxycblt.auxio.music.MusicRepository
 import org.oxycblt.auxio.music.Song
+import org.oxycblt.auxio.music.fs.Path
 import org.oxycblt.auxio.music.fs.contentResolverSafe
 import org.oxycblt.auxio.music.fs.useQuery
 import org.oxycblt.auxio.music.info.Name
@@ -74,6 +75,14 @@ interface DeviceLibrary {
      */
     fun findSongForUri(context: Context, uri: Uri): Song?
 
+    /**
+     * Find a [Song] instance corresponding to the given [Path].
+     *
+     * @param path [Path] to search for.
+     * @return A [Song] corresponding to the given [Path], or null if one could not be found.
+     */
+    fun findSongByPath(path: Path): Song?
+
     /**
      * Find a [Album] instance corresponding to the given [Music.UID].
      *
@@ -266,6 +275,7 @@ class DeviceLibraryImpl(
 ) : DeviceLibrary {
     // Use a mapping to make finding information based on it's UID much faster.
     private val songUidMap = buildMap { songs.forEach { put(it.uid, it.finalize()) } }
+    private val songPathMap = buildMap { songs.forEach { put(it.path, it) } }
     private val albumUidMap = buildMap { albums.forEach { put(it.uid, it.finalize()) } }
     private val artistUidMap = buildMap { artists.forEach { put(it.uid, it.finalize()) } }
     private val genreUidMap = buildMap { genres.forEach { put(it.uid, it.finalize()) } }
@@ -287,6 +297,8 @@ class DeviceLibraryImpl(
 
     override fun findGenre(uid: Music.UID): Genre? = genreUidMap[uid]
 
+    override fun findSongByPath(path: Path) = songPathMap[path]
+
     override fun findSongForUri(context: Context, uri: Uri) =
         context.contentResolverSafe.useQuery(
             uri, arrayOf(OpenableColumns.DISPLAY_NAME, OpenableColumns.SIZE)) { cursor ->

app/src/main/java/org/oxycblt/auxio/music/fs/Fs.kt

@@ -46,8 +46,6 @@ data class Path(
     val directory: Path
         get() = Path(volume, components.parent())
 
-    override fun toString() = "Path(storageVolume=$volume, components=$components)"
-
     /**
      * Transforms this [Path] into a "file" of the given name that's within the "directory"
      * represented by the current path. Ex. "/storage/emulated/0/Music" ->
@@ -169,7 +167,7 @@ class VolumeManagerImpl @Inject constructor(private val storageManager: StorageM
             }
         }
 
-    private class InternalVolumeImpl(val storageVolume: StorageVolume) : Volume.Internal {
+    private data class InternalVolumeImpl(val storageVolume: StorageVolume) : Volume.Internal {
         override val mediaStoreName
             get() = storageVolume.mediaStoreVolumeNameCompat
 
@@ -179,7 +177,7 @@ class VolumeManagerImpl @Inject constructor(private val storageManager: StorageM
         override fun resolveName(context: Context) = storageVolume.getDescriptionCompat(context)
     }
 
-    private class ExternalVolumeImpl(val storageVolume: StorageVolume) : Volume.External {
+    private data class ExternalVolumeImpl(val storageVolume: StorageVolume) : Volume.External {
         override val id
             get() = storageVolume.uuidCompat