package org.jaudiotagger.tag.mp4.field;

 import org.jaudiotagger.audio.generic.Utils;

 import org.jaudiotagger.audio.mp4.atom.Mp4BoxHeader;

 import org.jaudiotagger.logging.ErrorMessage;

 import org.jaudiotagger.tag.TagField;

 import org.jaudiotagger.tag.TagTextField;

 import org.jaudiotagger.tag.mp4.Mp4FieldKey;

 import org.jaudiotagger.tag.mp4.Mp4TagField;

 import org.jaudiotagger.tag.mp4.atom.Mp4DataBox;

 import org.jaudiotagger.tag.mp4.atom.Mp4MeanBox;

 import org.jaudiotagger.tag.mp4.atom.Mp4NameBox;

 import java.io.ByteArrayOutputStream;

 import java.io.IOException;

 import java.io.UnsupportedEncodingException;

 import java.nio.ByteBuffer;

 /**

  * Represents reverse dns field, used for custom information

  * <p/>

  * <p>Originally only used by Itunes for information that was iTunes specific but now used in a wide range of uses,

  * for example Musicbrainz uses it for many of its fields.

  * <p/>

  * These fields have a more complex setup

  * Box ----  shows this is a reverse dns metadata field

  * Box mean  the issuer in the form of reverse DNS domain (e.g com.apple.iTunes)

  * Box name  descriptor identifying the type of contents

  * Box data  contents

  * <p/>

  * The raw data passed starts from the mean box

  */

 public class Mp4TagReverseDnsField extends Mp4TagField implements TagTextField

 {

     public static final String IDENTIFIER = "----";

     protected int dataSize;

     //Issuer

     private String issuer;

     //Descriptor

     private String descriptor;

     //Data Content,

     //TODO assuming always text at the moment

     protected String content;

     /**

      * Construct from existing file data

      *

      * @param data

      * @throws UnsupportedEncodingException

      */

     public Mp4TagReverseDnsField(Mp4BoxHeader parentHeader, ByteBuffer data) throws UnsupportedEncodingException

     {

         super(parentHeader, data);

     }

     /**

      * Newly created Reverse Dns field

      *

      * @param id

      * @param content

      */

     public Mp4TagReverseDnsField(Mp4FieldKey id, String content)

     {

         super(id.getFieldName());

         this.issuer = id.getIssuer();

         this.descriptor = id.getIdentifier();

         this.content = content;

     }

     /**

      * Newly created Reverse Dns field bypassing the Mp4TagField enum for creation of temporary reverse dns fields

      */

     public Mp4TagReverseDnsField(final String fieldName, final String issuer, final String identifier, final String content)

     {

         super(fieldName);

         this.issuer     = issuer;

         this.descriptor = identifier;

         this.content    = content;

     }

     public Mp4FieldType getFieldType()

     {

         //TODO always assuming text at moment but may not always be the case (though dont have any concrete

         //examples)

         return Mp4FieldType.TEXT;

     }

     protected void build(ByteBuffer data) throws UnsupportedEncodingException

     {

         //Read mean box, set the issuer and skip over data

         Mp4BoxHeader meanBoxHeader = new Mp4BoxHeader(data);

         Mp4MeanBox meanBox = new Mp4MeanBox(meanBoxHeader, data);

         setIssuer(meanBox.getIssuer());

         data.position(data.position() + meanBoxHeader.getDataLength());

         //Read name box, identify what type of field it is

         Mp4BoxHeader nameBoxHeader = new Mp4BoxHeader(data);

         Mp4NameBox nameBox = new Mp4NameBox(nameBoxHeader, data);

         setDescriptor(nameBox.getName());

         data.position(data.position() + nameBoxHeader.getDataLength());

         //Issue 198:There is not actually a data atom there cannot cant be because no room for one

         if (parentHeader.getDataLength() == meanBoxHeader.getLength() + nameBoxHeader.getLength())

         {

             id = IDENTIFIER + ":" + issuer + ":" + descriptor;

             setContent("");

             logger.warning(ErrorMessage.MP4_REVERSE_DNS_FIELD_HAS_NO_DATA.getMsg(id));

         }

         //Usual Case

         else

         {

             //Read data box, identify the data

             Mp4BoxHeader dataBoxHeader = new Mp4BoxHeader(data);

             Mp4DataBox dataBox = new Mp4DataBox(dataBoxHeader, data);

             setContent(dataBox.getContent());

             data.position(data.position() + dataBoxHeader.getDataLength());

             //Now calculate the id which in order to be unique needs to use all htree values

             id = IDENTIFIER + ":" + issuer + ":" + descriptor;

         }

     }

     public void copyContent(TagField field)

     {

         if (field instanceof Mp4TagReverseDnsField)

         {

             this.issuer = ((Mp4TagReverseDnsField) field).getIssuer();

             this.descriptor = ((Mp4TagReverseDnsField) field).getDescriptor();

             this.content = ((Mp4TagReverseDnsField) field).getContent();

         }

     }

     /**

      * @return content

      */

     public String getContent()

     {

         return content;

     }

     protected byte[] getDataBytes() throws UnsupportedEncodingException

     {

         return content.getBytes(getEncoding());

     }

     public String getEncoding()

     {

         return Mp4BoxHeader.CHARSET_UTF_8;

     }

     /**

      * Convert back to raw content, includes ----,mean,name and data atom as views as one thing externally

      *

      * @return

      * @throws UnsupportedEncodingException

      */

     public byte[] getRawContent() throws UnsupportedEncodingException

     {

         try

         {

             ByteArrayOutputStream baos = new ByteArrayOutputStream();

             //Create Meanbox data

             byte[] issuerRawData = issuer.getBytes(getEncoding());

             baos.write(Utils.getSizeBEInt32(Mp4BoxHeader.HEADER_LENGTH + Mp4MeanBox.PRE_DATA_LENGTH + issuerRawData.length));

             baos.write(Utils.getDefaultBytes(Mp4MeanBox.IDENTIFIER, "ISO-8859-1"));

             baos.write(new byte[]{0, 0, 0, 0});

             baos.write(issuerRawData);

             //Create Namebox data

             byte[] nameRawData = descriptor.getBytes(getEncoding());

             baos.write(Utils.getSizeBEInt32(Mp4BoxHeader.HEADER_LENGTH + Mp4NameBox.PRE_DATA_LENGTH + nameRawData.length));

             baos.write(Utils.getDefaultBytes(Mp4NameBox.IDENTIFIER, "ISO-8859-1"));

             baos.write(new byte[]{0, 0, 0, 0});

             baos.write(nameRawData);

             //Create DataBox data if we have data only

             if (content.length() > 0)

             {

                 baos.write(getRawContentDataOnly());

             }

             //Now wrap with reversedns box

             ByteArrayOutputStream outerbaos = new ByteArrayOutputStream();

             outerbaos.write(Utils.getSizeBEInt32(Mp4BoxHeader.HEADER_LENGTH + baos.size()));

             outerbaos.write(Utils.getDefaultBytes(IDENTIFIER, "ISO-8859-1"));

             outerbaos.write(baos.toByteArray());

             return outerbaos.toByteArray();

         }

         catch (IOException ioe)

         {

             //This should never happen as were not actually writing to/from a file

             throw new RuntimeException(ioe);

         }

     }

     public byte[] getRawContentDataOnly() throws UnsupportedEncodingException

     {

         logger.fine("Getting Raw data for:" + getId());

         try

         {

             //Create DataBox data

             ByteArrayOutputStream baos = new ByteArrayOutputStream();

             byte[] dataRawData = content.getBytes(getEncoding());

             baos.write(Utils.getSizeBEInt32(Mp4BoxHeader.HEADER_LENGTH + Mp4DataBox.PRE_DATA_LENGTH + dataRawData.length));

             baos.write(Utils.getDefaultBytes(Mp4DataBox.IDENTIFIER, "ISO-8859-1"));

             baos.write(new byte[]{0});

             baos.write(new byte[]{0, 0, (byte) getFieldType().getFileClassId()});

             baos.write(new byte[]{0, 0, 0, 0});

             baos.write(dataRawData);

             return baos.toByteArray();

         }

         catch (IOException ioe)

         {

             //This should never happen as were not actually writing to/from a file

             throw new RuntimeException(ioe);

         }

     }

     public boolean isBinary()

     {

         return false;

     }

     public boolean isEmpty()

     {

         return this.content.trim().equals("");

     }

     public void setContent(String s)

     {

         this.content = s;

     }

     public void setEncoding(String s)

     {

         /* Not allowed */

     }

     public String toString()

     {

         return content;

     }

     /**

      * @return the issuer

      */

     public String getIssuer()

     {

         return issuer;

     }

     /**

      * @return the descriptor

      */

     public String getDescriptor()

     {

         return descriptor;

     }

     /**

      * Set the issuer, usually reverse dns of the Companies domain

      *

      * @param issuer

      */

     public void setIssuer(String issuer)

     {

         this.issuer = issuer;

     }

     /**

      * Set the descriptor for the data (what type of data it is)

      *

      * @param descriptor

      */

     public void setDescriptor(String descriptor)

     {

         this.descriptor = descriptor;

     }

 }