/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.dialer.app.dialpad;

import android.animation.Animator;
import android.animation.Animator.AnimatorListener;
import android.animation.ArgbEvaluator;
import android.animation.ValueAnimator;
import android.animation.ValueAnimator.AnimatorUpdateListener;
import android.content.Context;
import android.graphics.Color;
import android.graphics.ColorFilter;
import android.graphics.LightingColorFilter;
import android.os.Handler;
import android.os.Vibrator;
import android.view.View;
import com.android.dialer.app.R;

/** Animates the dial button on "emergency" phone numbers. */
public class PseudoEmergencyAnimator {

  public static final String PSEUDO_EMERGENCY_NUMBER = "01189998819991197253";
  private static final int VIBRATE_LENGTH_MILLIS = 200;
  private static final int ITERATION_LENGTH_MILLIS = 1000;
  private static final int ANIMATION_ITERATION_COUNT = 6;
  private ViewProvider mViewProvider;
  private ValueAnimator mPseudoEmergencyColorAnimator;

  PseudoEmergencyAnimator(ViewProvider viewProvider) {
    mViewProvider = viewProvider;
  }

  public void destroy() {
    end();
    mViewProvider = null;
  }

  public void start() {
    if (mPseudoEmergencyColorAnimator == null) {
      Integer colorFrom = Color.BLUE;
      Integer colorTo = Color.RED;
      mPseudoEmergencyColorAnimator =
          ValueAnimator.ofObject(new ArgbEvaluator(), colorFrom, colorTo);

      mPseudoEmergencyColorAnimator.addUpdateListener(
          new AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animator) {
              try {
                int color = (int) animator.getAnimatedValue();
                ColorFilter colorFilter = new LightingColorFilter(Color.BLACK, color);

                View floatingActionButtonContainer =
                    getView().findViewById(R.id.floating_action_button);
                if (floatingActionButtonContainer != null) {
                  floatingActionButtonContainer.getBackground().setColorFilter(colorFilter);
                }
              } catch (Exception e) {
                animator.cancel();
              }
            }
          });

      mPseudoEmergencyColorAnimator.addListener(
          new AnimatorListener() {
            @Override
            public void onAnimationCancel(Animator animation) {}

            @Override
            public void onAnimationRepeat(Animator animation) {
              try {
                vibrate(VIBRATE_LENGTH_MILLIS);
              } catch (Exception e) {
                animation.cancel();
              }
            }

            @Override
            public void onAnimationStart(Animator animation) {}

            @Override
            public void onAnimationEnd(Animator animation) {
              try {
                View floatingActionButtonContainer =
                    getView().findViewById(R.id.floating_action_button);
                if (floatingActionButtonContainer != null) {
                  floatingActionButtonContainer.getBackground().clearColorFilter();
                }

                new Handler()
                    .postDelayed(
                        new Runnable() {
                          @Override
                          public void run() {
                            try {
                              vibrate(VIBRATE_LENGTH_MILLIS);
                            } catch (Exception e) {
                              // ignored
                            }
                          }
                        },
                        ITERATION_LENGTH_MILLIS);
              } catch (Exception e) {
                animation.cancel();
              }
            }
          });

      mPseudoEmergencyColorAnimator.setDuration(VIBRATE_LENGTH_MILLIS);
      mPseudoEmergencyColorAnimator.setRepeatMode(ValueAnimator.REVERSE);
      mPseudoEmergencyColorAnimator.setRepeatCount(ANIMATION_ITERATION_COUNT);
    }
    if (!mPseudoEmergencyColorAnimator.isStarted()) {
      mPseudoEmergencyColorAnimator.start();
    }
  }

  public void end() {
    if (mPseudoEmergencyColorAnimator != null && mPseudoEmergencyColorAnimator.isStarted()) {
      mPseudoEmergencyColorAnimator.end();
    }
  }

  private View getView() {
    return mViewProvider == null ? null : mViewProvider.getView();
  }

  private Context getContext() {
    View view = getView();
    return view != null ? view.getContext() : null;
  }

  private void vibrate(long milliseconds) {
    Context context = getContext();
    if (context != null) {
      Vibrator vibrator = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
      if (vibrator != null) {
        vibrator.vibrate(milliseconds);
      }
    }
  }

  public interface ViewProvider {

    View getView();
  }
}