/*
 * 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.google.android.exoplayer2.metadata.id3;

import android.os.Parcel;
import com.google.android.exoplayer2.C;
import com.google.android.exoplayer2.util.Util;
import java.util.Arrays;

/**
 * Chapter information ID3 frame.
 */
public final class ChapterFrame extends Id3Frame {

  public static final String ID = "CHAP";

  public final String chapterId;
  public final int startTimeMs;
  public final int endTimeMs;
  /**
   * The byte offset of the start of the chapter, or {@link C#POSITION_UNSET} if not set.
   */
  public final long startOffset;
  /**
   * The byte offset of the end of the chapter, or {@link C#POSITION_UNSET} if not set.
   */
  public final long endOffset;
  private final Id3Frame[] subFrames;

  public ChapterFrame(String chapterId, int startTimeMs, int endTimeMs, long startOffset,
      long endOffset, Id3Frame[] subFrames) {
    super(ID);
    this.chapterId = chapterId;
    this.startTimeMs = startTimeMs;
    this.endTimeMs = endTimeMs;
    this.startOffset = startOffset;
    this.endOffset = endOffset;
    this.subFrames = subFrames;
  }

  /* package */ ChapterFrame(Parcel in) {
    super(ID);
    this.chapterId = in.readString();
    this.startTimeMs = in.readInt();
    this.endTimeMs = in.readInt();
    this.startOffset = in.readLong();
    this.endOffset = in.readLong();
    int subFrameCount = in.readInt();
    subFrames = new Id3Frame[subFrameCount];
    for (int i = 0; i < subFrameCount; i++) {
      subFrames[i] = in.readParcelable(Id3Frame.class.getClassLoader());
    }
  }

  /**
   * Returns the number of sub-frames.
   */
  public int getSubFrameCount() {
    return subFrames.length;
  }

  /**
   * Returns the sub-frame at {@code index}.
   */
  public Id3Frame getSubFrame(int index) {
    return subFrames[index];
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null || getClass() != obj.getClass()) {
      return false;
    }
    ChapterFrame other = (ChapterFrame) obj;
    return startTimeMs == other.startTimeMs
        && endTimeMs == other.endTimeMs
        && startOffset == other.startOffset
        && endOffset == other.endOffset
        && Util.areEqual(chapterId, other.chapterId)
        && Arrays.equals(subFrames, other.subFrames);
  }

  @Override
  public int hashCode() {
    int result = 17;
    result = 31 * result + startTimeMs;
    result = 31 * result + endTimeMs;
    result = 31 * result + (int) startOffset;
    result = 31 * result + (int) endOffset;
    result = 31 * result + (chapterId != null ? chapterId.hashCode() : 0);
    return result;
  }

  @Override
  public void writeToParcel(Parcel dest, int flags) {
    dest.writeString(chapterId);
    dest.writeInt(startTimeMs);
    dest.writeInt(endTimeMs);
    dest.writeLong(startOffset);
    dest.writeLong(endOffset);
    dest.writeInt(subFrames.length);
    for (Id3Frame subFrame : subFrames) {
      dest.writeParcelable(subFrame, 0);
    }
  }

  @Override
  public int describeContents() {
    return 0;
  }

  public static final Creator<ChapterFrame> CREATOR = new Creator<ChapterFrame>() {

    @Override
    public ChapterFrame createFromParcel(Parcel in) {
      return new ChapterFrame(in);
    }

    @Override
    public ChapterFrame[] newArray(int size) {
      return new ChapterFrame[size];
    }

  };

}
