package io.sentry.react;

import android.os.Handler;
import android.os.Looper;
import android.view.Choreographer;
import com.facebook.react.bridge.Promise;
import io.sentry.SentryDate;
import io.sentry.SentryDateProvider;

public final class RNSentryTimeToDisplay {

  private RNSentryTimeToDisplay() {}

  public static void getTimeToDisplay(Promise promise, SentryDateProvider dateProvider) {
    Looper mainLooper = Looper.getMainLooper();

    if (mainLooper == null) {
      promise.reject(
          "GetTimeToDisplay is not able to measure the time to display: Main looper not"
              + " available.");
      return;
    }

    // Ensure the code runs on the main thread
    new Handler(mainLooper)
        .post(
            () -> {
              try {
                Choreographer choreographer = Choreographer.getInstance();

                // Invoke the callback after the frame is rendered
                choreographer.postFrameCallback(
                    frameTimeNanos -> {
                      final SentryDate endDate = dateProvider.now();
                      promise.resolve(endDate.nanoTimestamp() / 1e9);
                    });
              } catch (Exception exception) {
                promise.reject("Failed to receive the instance of Choreographer", exception);
              }
            });
  }
}