/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You 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 org.apache.poi.ddf;

import org.apache.poi.util.HexDump;
import org.apache.poi.util.LittleEndian;

/**
 * This record simply holds the number of shapes in the drawing group and the
 * last shape id used for this drawing group.
 *
 * @author Glen Stampoultzis
 */
public class EscherDgRecord
    extends EscherRecord
{
    public static final short RECORD_ID = (short) 0xF008;
    public static final String RECORD_DESCRIPTION = "MsofbtDg";

    private int field_1_numShapes;
    private int field_2_lastMSOSPID;

    /**
     * This method deserializes the record from a byte array.
     *
     * @param data          The byte array containing the escher record information
     * @param offset        The starting offset into <code>data</code>.
     * @param recordFactory May be null since this is not a container record.
     * @return The number of bytes read from the byte array.
     */
    public int fillFields( byte[] data, int offset, EscherRecordFactory recordFactory )
    {
        int bytesRemaining = readHeader( data, offset );
        int pos            = offset + 8;
        int size           = 0;
        field_1_numShapes   =  LittleEndian.getInt( data, pos + size );     size += 4;
        field_2_lastMSOSPID =  LittleEndian.getInt( data, pos + size );     size += 4;
//        bytesRemaining -= size;
//        remainingData  =  new byte[bytesRemaining];
//        System.arraycopy( data, pos + size, remainingData, 0, bytesRemaining );
        return getRecordSize();
    }

    /**
     * This method serializes this escher record into a byte array.
     *
     * @param offset   The offset into <code>data</code> to start writing the record data to.
     * @param data     The byte array to serialize to.
     * @param listener A listener to retrieve start and end callbacks.  Use a <code>NullEscherSerailizationListener</code> to ignore these events.
     * @return The number of bytes written.
     * @see NullEscherSerializationListener
     */
    public int serialize( int offset, byte[] data, EscherSerializationListener listener )
    {
        listener.beforeRecordSerialize( offset, getRecordId(), this );

        LittleEndian.putShort( data, offset, getOptions() );
        LittleEndian.putShort( data, offset + 2, getRecordId() );
        LittleEndian.putInt( data, offset + 4, 8 );
        LittleEndian.putInt( data, offset + 8, field_1_numShapes );
        LittleEndian.putInt( data, offset + 12, field_2_lastMSOSPID );
//        System.arraycopy( remainingData, 0, data, offset + 26, remainingData.length );
//        int pos = offset + 8 + 18 + remainingData.length;

        listener.afterRecordSerialize( offset + 16, getRecordId(), getRecordSize(), this );
        return getRecordSize();
    }

    /**
     * Returns the number of bytes that are required to serialize this record.
     *
     * @return Number of bytes
     */
    public int getRecordSize()
    {
        return 8 + 8;
    }

    public short getRecordId()
    {
        return RECORD_ID;
    }

    /**
     * The short name for this record
     */
    public String getRecordName()
    {
        return "Dg";
    }

    /**
     * Returns the string representation of this record.
     */
    public String toString()
    {
        String nl = System.getProperty("line.separator");

//        String extraData;
//        ByteArrayOutputStream b = new ByteArrayOutputStream();
//        try
//        {
//            HexDump.dump(this.remainingData, 0, b, 0);
//            extraData = b.toString();
//        }
//        catch ( Exception e )
//        {
//            extraData = "error";
//        }
        return getClass().getName() + ":" + nl +
                "  RecordId: 0x" + HexDump.toHex(RECORD_ID) + nl +
                "  Options: 0x" + HexDump.toHex(getOptions()) + nl +
                "  NumShapes: " + field_1_numShapes + nl +
                "  LastMSOSPID: " + field_2_lastMSOSPID + nl;

    }

    /**
     * The number of shapes in this drawing group.
     */
    public int getNumShapes()
    {
        return field_1_numShapes;
    }

    /**
     * The number of shapes in this drawing group.
     */
    public void setNumShapes( int field_1_numShapes )
    {
        this.field_1_numShapes = field_1_numShapes;
    }

    /**
     * The last shape id used in this drawing group.
     */
    public int getLastMSOSPID()
    {
        return field_2_lastMSOSPID;
    }

    /**
     * The last shape id used in this drawing group.
     */
    public void setLastMSOSPID( int field_2_lastMSOSPID )
    {
        this.field_2_lastMSOSPID = field_2_lastMSOSPID;
    }

    /**
     * Gets the drawing group id for this record.  This is encoded in the
     * instance part of the option record.
     *
     * @return  a drawing group id.
     */
    public short getDrawingGroupId()
    {
        return (short) ( getOptions() >> 4 );
    }

    public void incrementShapeCount()
    {
        this.field_1_numShapes++;
    }
}