/*
 * This program is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
 * Foundation.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
 * or from the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * This program 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.
 *
 * Copyright (c) 2000 - 2009 Pentaho Corporation, Object Refinery Limited and Contributors.  All rights reserved.
 */

package org.pentaho.reporting.libraries.pixie.wmf.bitmap;

import java.io.IOException;
import java.io.InputStream;

public class RGBCompression extends BitmapCompression
{
  public RGBCompression()
  {
  }

  public int[] decompress(final InputStream in, final GDIPalette palette)
      throws IOException
  {
    final int[] target = new int[getWidth() * getHeight()];

    switch (getBpp())
    {
      case 1:
        fillMono(target, in, palette);
        break;
      case 4:
        fill4Bit(target, in, palette);
        break;
      case 8:
        fill8Bit(target, in, palette);
        break;
      case 16:
        fill16Bit(target, in, palette);
        break;
      case 24:
        fill24Bit(target, in, palette);
        break;
      case 32:
        fill32Bit(target, in, palette);
        break;
    }
    return target;
  }

  /**
   * Cut or padd the string to the given size
   *
   * @param size    the wanted length
   * @param padChar char to use for padding (must be of length()==1!)
   * @return the string with correct lenght, padded with pad if necessary
   */
  public static String forceToSizeLeft(final String str, final int size,
                                       final char padChar)
  {
    if (str != null && str.length() == size)
    {
      return str;
    }

    final StringBuffer tmp;
    if (str == null)
    {
      tmp = new StringBuffer(size);
    }
    else
    {
      tmp = new StringBuffer(str);
    }

    if (tmp.length() > size)
    {
      tmp.setLength(size);
      return tmp.toString();  // do cutting
    }
    else
    {
      final StringBuffer t2 = new StringBuffer(size);

      final int arsize = size - tmp.length();
      final char[] ar = new char[arsize];
      for (int i = 0; i < arsize; i++)
      {
        ar[i] = padChar;
      }
      t2.append(ar);
      t2.append(tmp);
      return t2.toString();
    }
  }

  public void fillMono(final int[] target, final InputStream in, final GDIPalette pal)
      throws IOException
  {
    final int noOfBytes = (int) Math.ceil(target.length / 8);
    if (isTopDown() == false)
    {
      for (int i = noOfBytes - 1; i >= 0; i--)
      {
        final int iByte = readInt(in);
        if (iByte == -1)
        {
          return;
        }


        final int[] data = expandMonocrome(iByte, pal);
        final int left = (target.length - i * 8);
        final int size = Math.min(8, left);

        for (int ij = size - 1; ij >= 0; ij--)
        {
          target[7 - ij + i * 8] = data[ij];
        }
      }
    }
    else
    {
      for (int i = 0; i < noOfBytes; i++)
      {
        final int iByte = readInt(in);
        if (iByte == -1)
        {
          return;
        }


        final int[] data = expandMonocrome(iByte, pal);
        System.arraycopy(data, 0, target, i * 8, 8);
      }
    }
  }

  public void fill4Bit(final int[] target, final InputStream in, final GDIPalette pal)
      throws IOException
  {
    final int noOfBytes = (int) Math.ceil(target.length / 2);

    if (isTopDown() == false)
    {
      for (int i = noOfBytes - 1; i >= 0; i--)
      {
        final int iByte = in.read();
        if (iByte == -1)
        {
          return;
        }

        final int[] data = expand4BitTuple(iByte, pal);
        target[i * 2] = data[1];
        target[i * 2 + 1] = data[0];
      }
    }
    else
    {
      for (int i = 0; i < noOfBytes; i++)
      {
        final int iByte = in.read();
        if (iByte == -1)
        {
          return;
        }

        final int[] data = expand4BitTuple(iByte, pal);
        target[i * 2] = data[0];
        target[i * 2 + 1] = data[1];
      }
    }
  }

  public void fill8Bit(final int[] target, final InputStream in, final GDIPalette pal)
      throws IOException
  {
    final int noOfBytes = target.length;
    if (isTopDown() == false)
    {
      for (int i = noOfBytes - 1; i >= 0; i--)
      {
        final int iByte = in.read();
        if (iByte == -1)
        {
          return;
        }

        target[i] = pal.lookupColor(iByte);
      }
    }
    else
    {
      for (int i = 0; i < noOfBytes; i++)
      {
        final int iByte = in.read();
        if (iByte == -1)
        {
          return;
        }

        target[i] = pal.lookupColor(iByte);
      }
    }
  }

  public void fill16Bit(final int[] target, final InputStream in, final GDIPalette pal)
      throws IOException
  {
    final int noOfBytes = target.length * 2;
    if (isTopDown() == false)
    {
      for (int i = noOfBytes - 1; i >= 0; i--)
      {
        final int iByte = in.read();
        if (iByte == -1)
        {
          return;
        }
        final int iByte2 = in.read();
        if (iByte2 == -1)
        {
          return;
        }

        target[i] = pal.lookupColor((iByte2 << 8) + iByte);
      }
    }
    else
    {
      for (int i = 0; i < noOfBytes; i++)
      {
        final int iByte = in.read();
        if (iByte == -1)
        {
          return;
        }
        final int iByte2 = in.read();
        if (iByte2 == -1)
        {
          return;
        }

        target[i] = pal.lookupColor((iByte2 << 8) + iByte);
      }
    }
  }

  public void fill24Bit(final int[] target, final InputStream in, final GDIPalette pal)
      throws IOException
  {
    final int noOfBytes = target.length * 4;
    if (isTopDown() == false)
    {
      for (int i = noOfBytes - 1; i >= 0; i--)
      {
        target[i] = pal.lookupColor(readInt(in));
      }
    }
    else
    {
      for (int i = 0; i < noOfBytes; i++)
      {
        target[i] = pal.lookupColor(readInt(in));
      }
    }
  }

  public void fill32Bit(final int[] target, final InputStream in, final GDIPalette pal)
      throws IOException
  {
    final int noOfBytes = target.length * 4;
    if (isTopDown() == false)
    {
      for (int i = noOfBytes - 1; i >= 0; i--)
      {
        target[i] = pal.lookupColor(readInt(in));
      }
    }
    else
    {
      for (int i = 0; i < noOfBytes; i++)
      {
        target[i] = pal.lookupColor(readInt(in));
      }
    }
  }

  protected int readInt(final InputStream in)
      throws IOException
  {
    final int iByte = in.read();
    if (iByte == -1)
    {
      return -1;
    }
    final int iByte2 = in.read();
    if (iByte2 == -1)
    {
      return -1;
    }
    final int iByte3 = in.read();
    if (iByte3 == -1)
    {
      return -1;
    }
    final int iByte4 = in.read();
    if (iByte4 == -1)
    {
      return -1;
    }

    return ((iByte4 << 24) + (iByte3 << 16) + (iByte2 << 8) + (iByte));
  }
}