import android.annotation.SuppressLint
import android.app.Application
import android.content.Context
import androidx.datastore.core.DataStore
import androidx.datastore.preferences.core.Preferences
import androidx.datastore.preferences.preferencesDataStore
import androidx.room.Room.databaseBuilder
import com.dklaw.memorize.database.DataStoreMemorize
import com.dklaw.memorize.database.ScoreDatabase

class MainApplication : Application() {

    init {
        instance = this
    }

    companion object {
        private var instance: MainApplication? = null

        fun applicationContext() : Context {
            return instance!!.applicationContext
        }

        lateinit var scoreDatabase: ScoreDatabase

        // Datastore 변수
        @SuppressLint("StaticFieldLeak")
        private lateinit var dataStore: DataStoreMemorize

        fun getThis() : MainApplication {
            return instance!!
        }

        fun  getDateStore() : DataStoreMemorize = dataStore
    }

    override fun onCreate() {
        super.onCreate()
        // initialize for any

        // Use ApplicationContext.
        val context: Context = MainApplication.applicationContext()

        // Datastore single Instance
        dataStore = DataStoreMemorize(this)

        // Database Initialize
        scoreDatabase = databaseBuilder(
            applicationContext,
            ScoreDatabase::class.java,
            ScoreDatabase.NAME
        ).build()
    }
}