Task 7: Create StationPreference entity and DAO

- Add StationPreference entity with FK to Station, unique index on stationId
- Add StationPreferenceDao with getByStationId, upsert, deleteByStationId
- Add station_preferences table via MIGRATION_4_5

Made-with: Cursor

app/src/main/java/xyz/cottongin/radio247/RadioApplication.kt

@@ -15,7 +15,7 @@ class RadioApplication : Application() {
     val database: RadioDatabase by lazy {
         Room.databaseBuilder(this, RadioDatabase::class.java, "radio_database")
             .addCallback(SomaFmSeedData)
-            .addMigrations(RadioDatabase.MIGRATION_1_2, RadioDatabase.MIGRATION_2_3, RadioDatabase.MIGRATION_3_4)
+            .addMigrations(RadioDatabase.MIGRATION_1_2, RadioDatabase.MIGRATION_2_3, RadioDatabase.MIGRATION_3_4, RadioDatabase.MIGRATION_4_5)
             .build()
     }
 

app/src/main/java/xyz/cottongin/radio247/data/db/RadioDatabase.kt

@@ -9,6 +9,7 @@ import xyz.cottongin.radio247.data.model.ListeningSession
 import xyz.cottongin.radio247.data.model.MetadataSnapshot
 import xyz.cottongin.radio247.data.model.Playlist
 import xyz.cottongin.radio247.data.model.Station
+import xyz.cottongin.radio247.data.model.StationPreference
 import xyz.cottongin.radio247.data.model.StationStream
 
 @Database(
@@ -18,9 +19,10 @@ import xyz.cottongin.radio247.data.model.StationStream
         MetadataSnapshot::class,
         ListeningSession::class,
         ConnectionSpan::class,
-        StationStream::class
+        StationStream::class,
+        StationPreference::class
     ],
-    version = 4,
+    version = 5,
     exportSchema = true
 )
 abstract class RadioDatabase : RoomDatabase() {
@@ -30,6 +32,7 @@ abstract class RadioDatabase : RoomDatabase() {
     abstract fun listeningSessionDao(): ListeningSessionDao
     abstract fun connectionSpanDao(): ConnectionSpanDao
     abstract fun stationStreamDao(): StationStreamDao
+    abstract fun stationPreferenceDao(): StationPreferenceDao
 
     companion object {
         val MIGRATION_1_2 = object : Migration(1, 2) {
@@ -63,5 +66,19 @@ abstract class RadioDatabase : RoomDatabase() {
                 SomaFmSeedData.seedStreamsForExistingStations(db)
             }
         }
+
+        val MIGRATION_4_5 = object : Migration(4, 5) {
+            override fun migrate(db: SupportSQLiteDatabase) {
+                db.execSQL(
+                    """CREATE TABLE IF NOT EXISTS station_preferences (
+                        id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
+                        stationId INTEGER NOT NULL,
+                        qualityOverride TEXT DEFAULT NULL,
+                        FOREIGN KEY(stationId) REFERENCES stations(id) ON DELETE CASCADE
+                    )"""
+                )
+                db.execSQL("CREATE UNIQUE INDEX IF NOT EXISTS index_station_preferences_stationId ON station_preferences(stationId)")
+            }
+        }
     }
 }

app/src/main/java/xyz/cottongin/radio247/data/db/StationPreferenceDao.kt

@@ -0,0 +1,18 @@
+package xyz.cottongin.radio247.data.db
+
+import androidx.room.Dao
+import androidx.room.Query
+import androidx.room.Upsert
+import xyz.cottongin.radio247.data.model.StationPreference
+
+@Dao
+interface StationPreferenceDao {
+    @Query("SELECT * FROM station_preferences WHERE stationId = :stationId")
+    suspend fun getByStationId(stationId: Long): StationPreference?
+
+    @Upsert
+    suspend fun upsert(pref: StationPreference)
+
+    @Query("DELETE FROM station_preferences WHERE stationId = :stationId")
+    suspend fun deleteByStationId(stationId: Long)
+}

app/src/main/java/xyz/cottongin/radio247/data/model/StationPreference.kt

@@ -0,0 +1,22 @@
+package xyz.cottongin.radio247.data.model
+
+import androidx.room.Entity
+import androidx.room.ForeignKey
+import androidx.room.Index
+import androidx.room.PrimaryKey
+
+@Entity(
+    tableName = "station_preferences",
+    foreignKeys = [ForeignKey(
+        entity = Station::class,
+        parentColumns = ["id"],
+        childColumns = ["stationId"],
+        onDelete = ForeignKey.CASCADE
+    )],
+    indices = [Index("stationId", unique = true)]
+)
+data class StationPreference(
+    @PrimaryKey(autoGenerate = true) val id: Long = 0,
+    val stationId: Long,
+    val qualityOverride: String? = null
+)