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A framework for building native apps with React
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/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

package com.facebook.react.modules.debug;

import javax.annotation.Nullable;

import java.util.Locale;

import android.os.Build;
import android.view.Choreographer;
import android.widget.Toast;

import com.facebook.common.logging.FLog;
import com.facebook.react.bridge.JSApplicationCausedNativeException;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;
import com.facebook.react.common.ReactConstants;
import com.facebook.react.module.annotations.ReactModule;

/**
 * Module that records debug information during transitions (animated navigation events such as
 * going from one screen to another).
 */
@ReactModule(name = "AnimationsDebugModule")
public class AnimationsDebugModule extends ReactContextBaseJavaModule {

  private @Nullable FpsDebugFrameCallback mFrameCallback;
  private @Nullable final DeveloperSettings mCatalystSettings;

  public AnimationsDebugModule(
      ReactApplicationContext reactContext,
      DeveloperSettings catalystSettings) {
    super(reactContext);
    mCatalystSettings = catalystSettings;
  }

  @Override
  public String getName() {
    return "AnimationsDebugModule";
  }

  @ReactMethod
  public void startRecordingFps() {
    if (mCatalystSettings == null ||
        !mCatalystSettings.isAnimationFpsDebugEnabled()) {
      return;
    }

    if (mFrameCallback != null) {
      throw new JSApplicationCausedNativeException("Already recording FPS!");
    }
    checkAPILevel();

    mFrameCallback = new FpsDebugFrameCallback(
                          Choreographer.getInstance(),
                          getReactApplicationContext());
    mFrameCallback.startAndRecordFpsAtEachFrame();
  }

  /**
   * Called when an animation finishes. The caller should include the animation stop time in ms
   * (unix time) so that we know when the animation stopped from the JS perspective and we don't
   * count time after as being part of the animation.
   */
  @ReactMethod
  public void stopRecordingFps(double animationStopTimeMs) {
    if (mFrameCallback == null) {
      return;
    }
    checkAPILevel();

    mFrameCallback.stop();

    // Casting to long is safe here since animationStopTimeMs is unix time and thus relatively small
    FpsDebugFrameCallback.FpsInfo fpsInfo = mFrameCallback.getFpsInfo((long) animationStopTimeMs);

    if (fpsInfo == null) {
      Toast.makeText(getReactApplicationContext(), "Unable to get FPS info", Toast.LENGTH_LONG);
    } else {
      String fpsString = String.format(
          Locale.US,
          "FPS: %.2f, %d frames (%d expected)",
          fpsInfo.fps,
          fpsInfo.totalFrames,
          fpsInfo.totalExpectedFrames);
      String jsFpsString = String.format(
          Locale.US,
          "JS FPS: %.2f, %d frames (%d expected)",
          fpsInfo.jsFps,
          fpsInfo.totalJsFrames,
          fpsInfo.totalExpectedFrames);
      String debugString = fpsString + "\n" + jsFpsString + "\n" +
          "Total Time MS: " + String.format(Locale.US, "%d", fpsInfo.totalTimeMs);
      FLog.d(ReactConstants.TAG, debugString);
      Toast.makeText(getReactApplicationContext(), debugString, Toast.LENGTH_LONG).show();
    }

    mFrameCallback = null;
  }

  @Override
  public void onCatalystInstanceDestroy() {
    if (mFrameCallback != null) {
      mFrameCallback.stop();
      mFrameCallback = null;
    }
  }

  private static void checkAPILevel() {
    if (Build.VERSION.SDK_INT < 16) {
      throw new JSApplicationCausedNativeException(
          "Animation debugging is not supported in API <16");
    }
  }
}