import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import io.flutter.embedding.android.FlutterView
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.embedding.engine.FlutterShellArgs
import io.flutter.embedding.engine.dart.DartExecutor
import io.flutter.facade.Flutter
import io.flutter.view.FlutterMain
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        Flutter.startInitialization(applicationContext)
        val shellArgs = FlutterShellArgs(arrayOf<String>())
        FlutterMain.ensureInitializationComplete(applicationContext, shellArgs.toArray())

        val engine = FlutterEngine(this).apply {
            navigationChannel.setInitialRoute("/")
            val appBundlePath = FlutterMain.findAppBundlePath(applicationContext)
            val entrypoint = DartExecutor.DartEntrypoint(resources.assets, appBundlePath, "main")
            dartExecutor.executeDartEntrypoint(entrypoint)
        }

        val flutterView = FlutterView(this, FlutterView.RenderMode.texture).apply {
            attachToFlutterEngine(engine)
        }

        button.setOnClickListener {
            if (flutterContainer.childCount == 0) {
                flutterContainer.addView(flutterView)
            } else {
                flutterContainer.removeView(flutterView)
            }
        }
    }
}