/*********************************************************************
*
*      Copyright (C) 2002 Andrew Khan
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
***************************************************************************/

package jxl.write.biff;

import java.util.List;

import jxl.biff.IntegerHelper;
import jxl.biff.Type;
import jxl.biff.WritableRecordData;
import jxl.write.Number;

/**
 * Contains an array of RK numbers
 */
class MulRKRecord extends WritableRecordData
{
  /**
   * The row  containing these numbers
   */
  private int row;
  /**
   * The first column these rk number occur on
   */
  private int colFirst;
  /**
   * The last column these rk number occur on
   */
  private int colLast;
  /**
   * The array of rk numbers
   */
  private int[] rknumbers;
  /**
   * The array of xf indices
   */
  private int[] xfIndices;

  /**
   * Constructs the rk numbers from the integer cells
   * 
   * @param numbers A list of jxl.write.Number objects
   */
  public MulRKRecord(List numbers)
  {
    super(Type.MULRK);
    row = ((Number)numbers.get(0)).getRow();
    colFirst = ((Number)numbers.get(0)).getColumn();
    colLast = colFirst + numbers.size() - 1;

    rknumbers = new int[numbers.size()];
    xfIndices = new int[numbers.size()];

    for (int i = 0; i < numbers.size(); i++)
    {
      rknumbers[i] = (int) ((Number)numbers.get(i)).getValue();
      xfIndices[i] = ( (CellValue) numbers.get(i)).getXFIndex();
    }
  }

  /**
   * Gets the binary data for output to file
   * 
   * @return the binary data
   */
  public byte[] getData()
  {
    byte[] data = new byte[rknumbers.length * 6 + 6];

    // Set up the row and the first column
    IntegerHelper.getTwoBytes(row, data, 0);
    IntegerHelper.getTwoBytes(colFirst, data, 2);

    // Add all the rk numbers
    int pos = 4;
    int rkValue = 0;
    byte[] rkBytes = new byte[4];
    for (int i = 0; i < rknumbers.length; i++)
    {
      IntegerHelper.getTwoBytes(xfIndices[i], data, pos);
      
      // To represent an int as an Excel RK value, we have to
      // undergo some outrageous jiggery pokery, as follows:

      // Gets the  bit representation of the number
      rkValue = rknumbers[i] << 2;

      // Set the integer bit
      rkValue |= 0x2;
      IntegerHelper.getFourBytes(rkValue, data, pos+2);

      pos+=6;
    }

    // Write the number of rk numbers in this record
    IntegerHelper.getTwoBytes(colLast, data, pos);

    return data;
  }
}