// TODO: add these dependencies
// def room_version = "2.2.5"
// implementation "androidx.room:room-runtime:$room_version"
// kapt "androidx.room:room-compiler:$room_version"
// implementation "androidx.room:room-ktx:$room_version"

@androidx.room.Database(
    entities = [EntityItem::class],
    version = 1
)
abstract class $DATABASENAME$ : androidx.room.RoomDatabase() {

    abstract fun getSimpleDao(): SimpleDao

    companion object {

        @Volatile
        private var instance: $DATABASENAME$? = null
        private val LOCK = Any()

        // create an instance of room database or use previously created instance
        operator fun invoke(context: android.content.Context) = instance ?: synchronized(LOCK) {
            instance ?: buildDatabase(context).also {
                instance = it
            }
        }

        private fun buildDatabase(context: android.content.Context) =
            androidx.room.Room.databaseBuilder(
                context.applicationContext,
                $DATABASENAME$::class.java,
                "MyDatabase.db"
            ).build()
    }
}

@androidx.room.Entity
data class EntityItem(
    @androidx.room.PrimaryKey(autoGenerate = false)
    val id: Int?
)

@androidx.room.Dao
interface SimpleDao {

    @androidx.room.Insert(onConflict = androidx.room.OnConflictStrategy.REPLACE)
    fun saveAllItems(items : List<EntityItem>)

    @androidx.room.Query("SELECT * FROM EntityItem")
    fun getAllItems() : androidx.lifecycle.LiveData<List<EntityItem>>

    @androidx.room.Query("SELECT * FROM EntityItem WHERE id = :id")
    fun getItem(id: Int) : androidx.lifecycle.LiveData<EntityItem>

    @androidx.room.Query("DELETE FROM EntityItem")
    suspend fun deleteEntries()

    @androidx.room.Delete
    fun deleteEntry(item: EntityItem)
}