/*
 * Copyright (C) 2016 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.incallui.answer.impl.answermethod;

import android.app.Activity;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.annotation.VisibleForTesting;
import android.support.v4.app.Fragment;
import com.android.dialer.common.LogUtil;
import com.android.incallui.util.AccessibilityUtil;

/** Creates the appropriate {@link AnswerMethod} for the circumstances. */
public class AnswerMethodFactory {
  private static boolean shouldUseTwoButtonMethodForTesting;

  @NonNull
  public static AnswerMethod createAnswerMethod(@NonNull Activity activity) {
    if (needTwoButton(activity)) {
      return new TwoButtonMethod();
    } else {
      return new FlingUpDownMethod();
    }
  }

  public static boolean needsReplacement(@Nullable Fragment answerMethod) {
    //noinspection SimplifiableIfStatement
    if (answerMethod == null) {
      return true;
    }
    // If we have already started showing TwoButtonMethod, we should keep showing TwoButtonMethod.
    // Otherwise check if we need to change to TwoButtonMethod
    return !(answerMethod instanceof TwoButtonMethod) && needTwoButton(answerMethod.getActivity());
  }

  @VisibleForTesting
  public static void setShouldUseTwoButtonMethodForTesting(boolean shouldUse) {
    shouldUseTwoButtonMethodForTesting = shouldUse;
  }

  private static boolean needTwoButton(@NonNull Activity activity) {
    if (shouldUseTwoButtonMethodForTesting) {
      LogUtil.i("AnswerMethodFactory.needTwoButton", "enabled for testing");
      return true;
    }

    return AccessibilityUtil.isTouchExplorationEnabled(activity) || activity.isInMultiWindowMode();
  }
}