Add player state persistence concept

app/src/main/kotlin/it/vfsfitvnm/vimusic/Database.kt

@@ -2,10 +2,12 @@ package it.vfsfitvnm.vimusic
 
 import android.content.Context
 import android.database.Cursor
+import android.os.Parcel
+import androidx.media3.common.MediaItem
 import androidx.room.*
-import androidx.sqlite.db.SupportSQLiteQuery
 import it.vfsfitvnm.vimusic.models.*
 import kotlinx.coroutines.flow.Flow
+import java.io.ByteArrayOutputStream
 
 
 @Dao
@@ -83,6 +85,15 @@ interface Database {
     @Insert(onConflict = OnConflictStrategy.ABORT)
     fun insert(song: Song): Long
 
+    @Insert(onConflict = OnConflictStrategy.ABORT)
+    fun insertQueuedMediaItems(queuedMediaItems: List<QueuedMediaItem>)
+
+    @Query("SELECT * FROM QueuedMediaItem")
+    fun queuedMediaItems(): List<QueuedMediaItem>
+
+    @Query("DELETE FROM QueuedMediaItem")
+    fun clearQueuedMediaItems()
+
     @Update
     fun update(song: Song)
 
@@ -114,14 +125,18 @@ interface Database {
 
 @androidx.room.Database(
     entities = [
-        Song::class, SongInPlaylist::class, Playlist::class, Info::class, SongWithAuthors::class, SearchQuery::class
+        Song::class, SongInPlaylist::class, Playlist::class, Info::class, SongWithAuthors::class, SearchQuery::class, QueuedMediaItem::class
     ],
     views = [
         SortedSongInPlaylist::class
     ],
-    version = 1,
-    exportSchema = true
+    version = 2,
+    exportSchema = true,
+    autoMigrations = [
+        AutoMigration(from = 1, to = 2)
+    ]
 )
+@TypeConverters(Converters::class)
 abstract class DatabaseInitializer protected constructor() : RoomDatabase() {
     abstract val database: Database
 
@@ -139,6 +154,37 @@ abstract class DatabaseInitializer protected constructor() : RoomDatabase() {
     }
 }
 
+@TypeConverters
+object Converters {
+    // TODO: temporary
+    @TypeConverter
+    fun mediaItemFromByteArray(value: ByteArray?): MediaItem? {
+        return value?.let { byteArray ->
+            val parcel = Parcel.obtain()
+            parcel.unmarshall(byteArray, 0, byteArray.size)
+            parcel.setDataPosition(0);
+
+            val pb = parcel.readBundle(MediaItem::class.java.classLoader)
+            parcel.recycle()
+            pb?.let {
+                MediaItem.CREATOR.fromBundle(pb)
+            }
+        }
+    }
+
+    // TODO: temporary
+    @TypeConverter
+    fun mediaItemToByteArray(mediaItem: MediaItem?): ByteArray? {
+        return mediaItem?.toBundle()?.let { persistableBundle ->
+            val parcel = Parcel.obtain()
+            parcel.writeBundle(persistableBundle)
+            parcel.marshall().also {
+                parcel.recycle()
+            }
+        }
+    }
+}
+
 val Database.internal: RoomDatabase
     get() = DatabaseInitializer.Instance