package com.cuvent.experiences.friends.camera

import androidx.camera.core.FocusMeteringAction
import androidx.camera.core.SurfaceOrientedMeteringPointFactory
import com.facebook.react.bridge.ReadableMap
import kotlinx.coroutines.guava.await
import java.util.concurrent.TimeUnit

suspend fun CameraView.focus(pointMap: ReadableMap) {
    val cameraControl = camera?.cameraControl ?: throw CameraNotReadyError()
    if (!pointMap.hasKey("x") || !pointMap.hasKey("y")) {
        throw InvalidTypeScriptUnionError("point", pointMap.toString())
    }

    val dpi = resources.displayMetrics.density
    val x = pointMap.getDouble("x") * dpi
    val y = pointMap.getDouble("y") * dpi

    val factory = SurfaceOrientedMeteringPointFactory(this.width.toFloat(), this.height.toFloat())
    val point = factory.createPoint(x.toFloat(), y.toFloat())
    val action = FocusMeteringAction.Builder(point, FocusMeteringAction.FLAG_AF or FocusMeteringAction.FLAG_AE)
            .setAutoCancelDuration(5, TimeUnit.SECONDS) // auto-reset after 5 seconds
            .build()

    cameraControl.startFocusAndMetering(action).await()
}