music: allow renaming playlist before import

When you import a playlist, Auxio will now always display the
"New Playlist" dialog so you can change whatever name Auxio has picked
for the imported playlist.

This also prevents the creation of two playlists with the same names.

app/src/main/java/org/oxycblt/auxio/home/HomeFragment.kt

@@ -471,7 +471,9 @@ class HomeFragment :
                 is PlaylistDecision.New -> {
                     logD("Creating new playlist")
                     HomeFragmentDirections.newPlaylist(
-                        decision.songs.map { it.uid }.toTypedArray(), decision.reason)
+                        decision.songs.map { it.uid }.toTypedArray(),
+                        decision.template,
+                        decision.reason)
                 }
                 is PlaylistDecision.Import -> {
                     logD("Importing playlist")

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

@@ -29,7 +29,6 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.async
 import kotlinx.coroutines.channels.Channel
-import kotlinx.coroutines.isActive
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import kotlinx.coroutines.withTimeout

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

@@ -51,15 +51,18 @@ constructor(
 ) : ViewModel(), MusicRepository.UpdateListener, MusicRepository.IndexingListener {
 
     private val _indexingState = MutableStateFlow<IndexingState?>(null)
+
     /** The current music loading state, or null if no loading is going on. */
     val indexingState: StateFlow<IndexingState?> = _indexingState
 
     private val _statistics = MutableStateFlow<Statistics?>(null)
+
     /** [Statistics] about the last completed music load. */
     val statistics: StateFlow<Statistics?>
         get() = _statistics
 
     private val _playlistDecision = MutableEvent<PlaylistDecision>()
+
     /**
      * A [PlaylistDecision] command that is awaiting a view capable of responding to it. Null if
      * none currently.
@@ -137,7 +140,7 @@ constructor(
             }
         } else {
             logD("Launching creation dialog for ${songs.size} songs")
-            _playlistDecision.put(PlaylistDecision.New(songs, reason))
+            _playlistDecision.put(PlaylistDecision.New(songs, null, reason))
         }
     }
 
@@ -168,14 +171,14 @@ constructor(
                     _playlistMessage.put(PlaylistMessage.ImportFailed)
                     return@launch
                 }
-                // TODO Require the user to name it something else if the name is a duplicate of
-                //  a prior playlist
+
                 if (target !== null) {
                     musicRepository.rewritePlaylist(target, songs)
                     _playlistMessage.put(PlaylistMessage.ImportSuccess)
                 } else {
-                    // TODO: Have to properly propagate the "Playlist Created" message
-                    createPlaylist(importedPlaylist.name, songs, PlaylistDecision.New.Reason.IMPORT)
+                    _playlistDecision.put(
+                        PlaylistDecision.New(
+                            songs, importedPlaylist.name, PlaylistDecision.New.Reason.IMPORT))
                 }
             }
         } else {
@@ -211,17 +214,27 @@ constructor(
      *
      * @param playlist The [Playlist] to rename,
      * @param name The new name of the [Playlist]. If null, the user will be prompted for a name.
+     * @param reason The reason why the playlist is being renamed. For all intensive purposes, you
      */
-    fun renamePlaylist(playlist: Playlist, name: String? = null) {
+    fun renamePlaylist(
+        playlist: Playlist,
+        name: String? = null,
+        reason: PlaylistDecision.Rename.Reason = PlaylistDecision.Rename.Reason.ACTION
+    ) {
         if (name != null) {
             logD("Renaming $playlist to $name")
             viewModelScope.launch(Dispatchers.IO) {
                 musicRepository.renamePlaylist(playlist, name)
-                _playlistMessage.put(PlaylistMessage.RenameSuccess)
+                val message =
+                    when (reason) {
+                        PlaylistDecision.Rename.Reason.ACTION -> PlaylistMessage.RenameSuccess
+                        PlaylistDecision.Rename.Reason.IMPORT -> PlaylistMessage.ImportSuccess
+                    }
+                _playlistMessage.put(message)
             }
         } else {
             logD("Launching rename dialog for $playlist")
-            _playlistDecision.put(PlaylistDecision.Rename(playlist))
+            _playlistDecision.put(PlaylistDecision.Rename(playlist, reason))
         }
     }
 
@@ -336,9 +349,12 @@ sealed interface PlaylistDecision {
      * Navigate to a dialog that allows a user to pick a name for a new [Playlist].
      *
      * @param songs The [Song]s to contain in the new [Playlist].
+     * @param template An existing playlist name that should be editable in the opened dialog. If
+     *   null, a placeholder should be created and shown as a hint instead.
      * @param context The context in which this decision is being fulfilled.
      */
-    data class New(val songs: List<Song>, val reason: Reason) : PlaylistDecision {
+    data class New(val songs: List<Song>, val template: String?, val reason: Reason) :
+        PlaylistDecision {
         enum class Reason {
             NEW,
             ADD,
@@ -359,7 +375,12 @@ sealed interface PlaylistDecision {
      *
      * @param playlist The playlist to act on.
      */
-    data class Rename(val playlist: Playlist) : PlaylistDecision
+    data class Rename(val playlist: Playlist, val reason: Reason) : PlaylistDecision {
+        enum class Reason {
+            ACTION,
+            IMPORT
+        }
+    }
 
     /**
      * Navigate to a dialog that allows the user to export a [Playlist].

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

@@ -100,7 +100,7 @@ class AddToPlaylistDialog :
         findNavController()
             .navigateSafe(
                 AddToPlaylistDialogDirections.newPlaylist(
-                    songs.map { it.uid }.toTypedArray(), PlaylistDecision.New.Reason.ADD))
+                    songs.map { it.uid }.toTypedArray(), null, PlaylistDecision.New.Reason.ADD))
     }
 
     private fun updatePendingSongs(songs: List<Song>?) {

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

@@ -19,6 +19,7 @@
 package org.oxycblt.auxio.music.decision
 
 import android.os.Bundle
+import android.text.Editable
 import android.view.LayoutInflater
 import androidx.appcompat.app.AlertDialog
 import androidx.core.widget.addTextChangedListener
@@ -47,6 +48,7 @@ class NewPlaylistDialog : ViewBindingMaterialDialogFragment<DialogPlaylistNameBi
     // Information about what playlist to name for is initially within the navigation arguments
     // as UIDs, as that is the only safe way to parcel playlist information.
     private val args: NewPlaylistDialogArgs by navArgs()
+    private var initializedField = false
 
     override fun onConfigDialog(builder: AlertDialog.Builder) {
         builder
@@ -83,6 +85,14 @@ class NewPlaylistDialog : ViewBindingMaterialDialogFragment<DialogPlaylistNameBi
         // --- VIEWMODEL SETUP ---
         musicModel.playlistDecision.consume()
         pickerModel.setPendingPlaylist(requireContext(), args.songUids, args.reason)
+        if (!initializedField) {
+            initializedField = true
+            // Need to convert args.existingName to an Editable
+            if (args.template != null) {
+                binding.playlistName.text = EDITABLE_FACTORY.newEditable(args.template)
+            }
+        }
+
         collectImmediately(pickerModel.currentPendingPlaylist, ::updatePendingPlaylist)
         collectImmediately(pickerModel.chosenName, ::updateChosenName)
     }
@@ -101,4 +111,8 @@ class NewPlaylistDialog : ViewBindingMaterialDialogFragment<DialogPlaylistNameBi
         (dialog as AlertDialog).getButton(AlertDialog.BUTTON_POSITIVE)?.isEnabled =
             chosenName is ChosenName.Valid || chosenName is ChosenName.Empty
     }
+
+    private companion object {
+        val EDITABLE_FACTORY: Editable.Factory = Editable.Factory.getInstance()
+    }
 }

app/src/main/res/navigation/inner.xml

@@ -413,6 +413,10 @@
         <argument
             android:name="songUids"
             app:argType="org.oxycblt.auxio.music.Music$UID[]" />
+        <argument
+            android:name="template"
+            app:argType="string"
+            app:nullable="true" />
         <argument
             android:name="reason"
             app:argType="org.oxycblt.auxio.music.PlaylistDecision$New$Reason" />