music: re-add add -> new playlist route

Re-add the add to playlist -> new playlist route that was accidentally
removed at some point.

app/src/main/java/org/oxycblt/auxio/detail/picker/DetailPickerViewModel.kt

@@ -33,12 +33,13 @@ import org.oxycblt.auxio.util.logD
 import org.oxycblt.auxio.util.logW
 
 /**
- * A [ViewModel] that stores the current information required for navigation picker dialogs
+ * A [ViewModel] that stores choice information for [ShowArtistDialog], and possibly others in the
+ * future.
  *
  * @author Alexander Capehart (OxygenCobalt)
  */
 @HiltViewModel
-class NavigationPickerViewModel @Inject constructor(private val musicRepository: MusicRepository) :
+class DetailPickerViewModel @Inject constructor(private val musicRepository: MusicRepository) :
     ViewModel(), MusicRepository.UpdateListener {
     private val _artistChoices = MutableStateFlow<ArtistShowChoices?>(null)
     /** The current set of [Artist] choices to show in the picker, or null if to show nothing. */

app/src/main/java/org/oxycblt/auxio/detail/picker/ShowArtistDialog.kt

@@ -46,7 +46,7 @@ import org.oxycblt.auxio.util.logD
 class ShowArtistDialog :
     ViewBindingMaterialDialogFragment<DialogMusicChoicesBinding>(), ClickableListListener<Artist> {
     private val detailModel: DetailViewModel by activityViewModels()
-    private val pickerModel: NavigationPickerViewModel by viewModels()
+    private val pickerModel: DetailPickerViewModel by viewModels()
     // Information about what artists to show choices for is initially within the navigation
     // arguments as UIDs, as that is the only safe way to parcel an artist.
     private val args: ShowArtistDialogArgs by navArgs()

app/src/main/java/org/oxycblt/auxio/music/picker/AddToPlaylistDialog.kt

@@ -32,10 +32,13 @@ import org.oxycblt.auxio.R
 import org.oxycblt.auxio.databinding.DialogMusicChoicesBinding
 import org.oxycblt.auxio.list.ClickableListListener
 import org.oxycblt.auxio.music.MusicViewModel
+import org.oxycblt.auxio.music.PlaylistDecision
 import org.oxycblt.auxio.music.Song
 import org.oxycblt.auxio.ui.ViewBindingMaterialDialogFragment
+import org.oxycblt.auxio.util.collect
 import org.oxycblt.auxio.util.collectImmediately
 import org.oxycblt.auxio.util.logD
+import org.oxycblt.auxio.util.navigateSafe
 import org.oxycblt.auxio.util.showToast
 
 /**
@@ -72,8 +75,8 @@ class AddToPlaylistDialog :
         }
 
         // --- VIEWMODEL SETUP ---
-        musicModel.playlistDecision.consume()
         pickerModel.setSongsToAdd(args.songUids)
+        collect(musicModel.playlistDecision.flow, ::handleDecision)
         collectImmediately(pickerModel.currentSongsToAdd, ::updatePendingSongs)
         collectImmediately(pickerModel.playlistAddChoices, ::updatePlaylistChoices)
     }
@@ -93,6 +96,25 @@ class AddToPlaylistDialog :
         musicModel.createPlaylist(songs = pickerModel.currentSongsToAdd.value ?: return)
     }
 
+    private fun handleDecision(decision: PlaylistDecision?) {
+        when (decision) {
+            is PlaylistDecision.Add -> {
+                logD("Navigated to playlist add dialog")
+                musicModel.playlistDecision.consume()
+            }
+            is PlaylistDecision.New -> {
+                logD("Navigating to new playlist dialog")
+                findNavController()
+                    .navigateSafe(
+                        AddToPlaylistDialogDirections.newPlaylist(
+                            decision.songs.map { it.uid }.toTypedArray()))
+            }
+            is PlaylistDecision.Rename,
+            is PlaylistDecision.Delete -> error("Unexpected decision $decision")
+            null -> {}
+        }
+    }
+
     private fun updatePendingSongs(songs: List<Song>?) {
         if (songs == null) {
             logD("No songs to show choices for, navigating away")

app/src/main/java/org/oxycblt/auxio/music/picker/NewPlaylistDialog.kt

@@ -32,6 +32,7 @@ import org.oxycblt.auxio.databinding.DialogPlaylistNameBinding
 import org.oxycblt.auxio.music.MusicViewModel
 import org.oxycblt.auxio.ui.ViewBindingMaterialDialogFragment
 import org.oxycblt.auxio.util.collectImmediately
+import org.oxycblt.auxio.util.logD
 import org.oxycblt.auxio.util.showToast
 import org.oxycblt.auxio.util.unlikelyToBeNull
 
@@ -84,9 +85,20 @@ class NewPlaylistDialog : ViewBindingMaterialDialogFragment<DialogPlaylistNameBi
         // --- VIEWMODEL SETUP ---
         musicModel.playlistDecision.consume()
         pickerModel.setPendingPlaylist(requireContext(), args.songUids)
+        collectImmediately(pickerModel.currentPendingPlaylist, ::updatePendingPlaylist)
         collectImmediately(pickerModel.chosenName, ::updateChosenName)
     }
 
+    private fun updatePendingPlaylist(pendingPlaylist: PendingPlaylist?) {
+        if (pendingPlaylist == null) {
+            logD("No playlist to create, leaving")
+            findNavController().navigateUp()
+            return
+        }
+
+        requireBinding().playlistName.hint = pendingPlaylist.preferredName
+    }
+
     private fun updateChosenName(chosenName: ChosenName) {
         (dialog as AlertDialog).getButton(AlertDialog.BUTTON_POSITIVE)?.isEnabled =
             chosenName is ChosenName.Valid || chosenName is ChosenName.Empty