/*
 * Copyright (C) 2017 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.incall.impl;

import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.PagerAdapter;
import com.android.dialer.common.Assert;
import com.android.dialer.multimedia.MultimediaData;
import com.android.incallui.sessiondata.MultimediaFragment;

/** View pager adapter for in call ui. */
public class InCallPagerAdapter extends FragmentStatePagerAdapter {

  @Nullable private MultimediaData attachments;
  private final boolean showInCallButtonGrid;

  public InCallPagerAdapter(
      FragmentManager fragmentManager,
      @Nullable MultimediaData attachments,
      boolean showInCallButtonGrid) {
    super(fragmentManager);
    this.attachments = attachments;
    this.showInCallButtonGrid = showInCallButtonGrid;
  }

  @Override
  public Fragment getItem(int position) {
    if (!showInCallButtonGrid) {
      // TODO(calderwoodra): handle fragment invalidation for when the data changes.
      return MultimediaFragment.newInstance(
          attachments, true /* isInteractive */, false /* showAvatar */, false /* isSpam */);

    } else if (position == getButtonGridPosition()) {
      return InCallButtonGridFragment.newInstance();

    } else {
      return MultimediaFragment.newInstance(
          attachments, true /* isInteractive */, false /* showAvatar */, false /* isSpam */);
    }
  }

  @Override
  public int getCount() {
    int count = 0;
    if (showInCallButtonGrid) {
      count++;
    }
    if (attachments != null && attachments.hasData()) {
      count++;
    }
    Assert.checkArgument(count > 0, "InCallPager adapter doesn't have any pages.");
    return count;
  }

  public void setAttachments(@Nullable MultimediaData attachments) {
    if (this.attachments != attachments) {
      this.attachments = attachments;
      notifyDataSetChanged();
    }
  }

  public int getButtonGridPosition() {
    return getCount() - 1;
  }

  //this is called when notifyDataSetChanged() is called
  @Override
  public int getItemPosition(Object object) {
    // refresh all fragments when data set changed
    return PagerAdapter.POSITION_NONE;
  }
}