/**

  *  @author : Paul Taylor

  *  @author : Eric Farng

  *

  *  Version @version:$Id: Lyrics3v1.java 836 2009-11-12 15:44:07Z paultaylor $

  *

  *  MusicTag Copyright (C)2003,2004

  *

  *  This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser

  *  General Public  License as published by the Free Software Foundation; either version 2.1 of the License,

  *  or (at your option) any later version.

  *

  *  This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even

  *  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

  *  See the GNU Lesser General Public License for more details.

  *

  *  You should have received a copy of the GNU Lesser General Public License along with this library; if not,

  *  you can get a copy from http://www.opensource.org/licenses/lgpl-license.php or write to the Free Software

  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

  *

  * Description:

  */

 package org.jaudiotagger.tag.lyrics3;

 import org.jaudiotagger.tag.TagException;

 import org.jaudiotagger.tag.TagNotFoundException;

 import org.jaudiotagger.tag.id3.AbstractTag;

 import org.jaudiotagger.tag.id3.ID3Tags;

 import org.jaudiotagger.tag.id3.ID3v1Tag;

 import java.io.IOException;

 import java.io.RandomAccessFile;

 import java.nio.ByteBuffer;

 import java.util.Iterator;

 public class Lyrics3v1 extends AbstractLyrics3

 {

     /**

      *

      */

     private String lyric = "";

     /**

      * Creates a new Lyrics3v1 datatype.

      */

     public Lyrics3v1()

     {

     }

     public Lyrics3v1(Lyrics3v1 copyObject)

     {

         super(copyObject);

         this.lyric = copyObject.lyric;

     }

     public Lyrics3v1(AbstractTag mp3Tag)

     {

         if (mp3Tag != null)

         {

             Lyrics3v2 lyricTag;

             if (mp3Tag instanceof Lyrics3v1)

             {

                 throw new UnsupportedOperationException("Copy Constructor not called. Please type cast the argument");

             }

             else if (mp3Tag instanceof Lyrics3v2)

             {

                 lyricTag = (Lyrics3v2) mp3Tag;

             }

             else

             {

                 lyricTag = new Lyrics3v2(mp3Tag);

             }

             FieldFrameBodyLYR lyricField;

             lyricField = (FieldFrameBodyLYR) lyricTag.getField("LYR").getBody();

             this.lyric = lyricField.getLyric();

         }

     }

     /**

      * Creates a new Lyrics3v1 datatype.

      *

      * @param file

      * @throws TagNotFoundException

      * @throws java.io.IOException

      * @param byteBuffer

      */

     public Lyrics3v1(ByteBuffer byteBuffer) throws TagNotFoundException, java.io.IOException

     {

         try

         {

             this.read(byteBuffer);

         }

         catch (TagException e)

         {

             e.printStackTrace();

         }

     }

     /**

      * @return

      */

     public String getIdentifier()

     {

         return "Lyrics3v1.00";

     }

     /**

      * @param lyric

      */

     public void setLyric(String lyric)

     {

         this.lyric = ID3Tags.truncate(lyric, 5100);

     }

     /**

      * @return

      */

     public String getLyric()

     {

         return lyric;

     }

     /**

      * @return

      */

     public int getSize()

     {

         return "LYRICSBEGIN".length() + lyric.length() + "LYRICSEND".length();

     }

     /**

      * @param obj

      * @return

      */

     public boolean isSubsetOf(Object obj)

     {

         return (obj instanceof Lyrics3v1) && (((Lyrics3v1) obj).lyric.contains(this.lyric));

     }

     /**

      * @param obj

      * @return

      */

     public boolean equals(Object obj)

     {

         if (!(obj instanceof Lyrics3v1))

         {

             return false;

         }

         Lyrics3v1 object = (Lyrics3v1) obj;

         return this.lyric.equals(object.lyric) && super.equals(obj);

     }

     /**

      * @return

      * @throws java.lang.UnsupportedOperationException

      *

      */

     public Iterator iterator()

     {

         /**

          * @todo Implement this org.jaudiotagger.tag.AbstractMP3Tag abstract method

          */

         throw new java.lang.UnsupportedOperationException("Method iterator() not yet implemented.");

     }

     /**

      * TODO implement

      *

      * @param byteBuffer

      * @return

      * @throws IOException

      */

     public boolean seek(ByteBuffer byteBuffer)

     {

         return false;

     }

     /**

      * @param byteBuffer

      * @throws TagNotFoundException

      * @throws IOException

      */

     public void read(ByteBuffer byteBuffer) throws TagException

     {

         byte[] buffer = new byte[5100 + 9 + 11];

         String lyricBuffer;

         if (!seek(byteBuffer))

         {

             throw new TagNotFoundException("ID3v1 tag not found");

         }

         byteBuffer.get(buffer);

         lyricBuffer = new String(buffer);

         lyric = lyricBuffer.substring(0, lyricBuffer.indexOf("LYRICSEND"));

     }

     /**

      * @param file

      * @return

      * @throws IOException

      */

     public boolean seek(RandomAccessFile file) throws IOException

     {

         byte[] buffer = new byte[5100 + 9 + 11];

         String lyricsEnd;

         String lyricsStart;

         long offset;

         // check right before the ID3 1.0 tag for the lyrics tag

         file.seek(file.length() - 128 - 9);

         file.read(buffer, 0, 9);

         lyricsEnd = new String(buffer, 0, 9);

         if (lyricsEnd.equals("LYRICSEND"))

         {

             offset = file.getFilePointer();

         }

         else

         {

             // check the end of the file for a lyrics tag incase an ID3

             // tag wasn't placed after it.

             file.seek(file.length() - 9);

             file.read(buffer, 0, 9);

             lyricsEnd = new String(buffer, 0, 9);

             if (lyricsEnd.equals("LYRICSEND"))

             {

                 offset = file.getFilePointer();

             }

             else

             {

                 return false;

             }

         }

         // the tag can at most only be 5100 bytes

         offset -= (5100 + 9 + 11);

         file.seek(offset);

         file.read(buffer);

         lyricsStart = new String(buffer);

         // search for the tag

         int i = lyricsStart.indexOf("LYRICSBEGIN");

         if (i == -1)

         {

             return false;

         }

         file.seek(offset + i + 11);

         return true;

     }

     /**

      * @return

      */

     public String toString()

     {

         String str = getIdentifier() + " " + this.getSize() + "\n";

         return str + lyric;

     }

     /**

      * @param file

      * @throws IOException

      */

     public void write(RandomAccessFile file) throws IOException

     {

         String str;

         int offset;

         byte[] buffer;

         ID3v1Tag id3v1tag;

         id3v1tag = null;

         delete(file);

         file.seek(file.length());

         buffer = new byte[lyric.length() + 11 + 9];

         str = "LYRICSBEGIN";

         for (int i = 0; i < str.length(); i++)

         {

             buffer[i] = (byte) str.charAt(i);

         }

         offset = str.length();

         str = ID3Tags.truncate(lyric, 5100);

         for (int i = 0; i < str.length(); i++)

         {

             buffer[i + offset] = (byte) str.charAt(i);

         }

         offset += str.length();

         str = "LYRICSEND";

         for (int i = 0; i < str.length(); i++)

         {

             buffer[i + offset] = (byte) str.charAt(i);

         }

         offset += str.length();

         file.write(buffer, 0, offset);

         if (id3v1tag != null)

         {

             id3v1tag.write(file);

         }

     }

 }