/*
* 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) 2001 - 2013 Object Refinery Ltd, Pentaho Corporation and Contributors..  All rights reserved.
*/

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

import org.pentaho.reporting.libraries.pixie.wmf.MfDcState;
import org.pentaho.reporting.libraries.pixie.wmf.MfRecord;
import org.pentaho.reporting.libraries.pixie.wmf.MfType;
import org.pentaho.reporting.libraries.pixie.wmf.WmfFile;

import java.awt.*;
import java.awt.geom.Rectangle2D;

/**
 * top, left, right and bottom define the points of the clipping region, the resultant clipping region is the
 * intersection of this region and the original region.
 */
public class MfCmdIntersectClipRect extends MfCmd {
  private static final int RECORD_SIZE = 4;
  private static final int POS_BOTTOM = 3;
  private static final int POS_RIGHT = 2;
  private static final int POS_TOP = 1;
  private static final int POS_LEFT = 0;

  private int x;
  private int y;
  private int width;
  private int height;

  private int scaled_x;
  private int scaled_y;
  private int scaled_width;
  private int scaled_height;

  public MfCmdIntersectClipRect() {
  }

  /**
   * Replays the command on the given WmfFile.
   *
   * @param file the meta file.
   */
  public void replay( final WmfFile file ) {
    final MfDcState state = file.getCurrentState();
    final Rectangle rect = state.getClipRegion();
    final Rectangle2D rec2 = rect.createIntersection( getScaledIntersectClipRect() );
    state.setClipRegion( new Rectangle( (int) rec2.getX(),
      (int) rec2.getY(),
      (int) rec2.getWidth(),
      (int) rec2.getHeight() ) );
  }

  /**
   * Creates a empty unintialized copy of this command implementation.
   *
   * @return a new instance of the command.
   */
  public MfCmd getInstance() {
    return new MfCmdIntersectClipRect();
  }

  /**
   * Reads the function identifier. Every record type is identified by a function number corresponding to one of the
   * Windows GDI functions used.
   *
   * @return the function identifier.
   */
  public int getFunction() {
    return MfType.INTERSECT_CLIP_RECT;
  }

  public Rectangle getIntersectClipRect() {
    return new Rectangle( x, y, width, height );
  }

  public Rectangle getScaledIntersectClipRect() {
    return new Rectangle( scaled_x, scaled_y, scaled_width, scaled_height );
  }

  public String toString() {
    final StringBuffer b = new StringBuffer();
    b.append( "[INTERSECT_CLIP_RECT] bounds=" );
    b.append( getIntersectClipRect() );
    return b.toString();
  }

  public void setIntersectClipRect( final int x, final int y, final int width,
                                    final int height ) {
    this.x = x;
    this.y = y;
    this.width = width;
    this.height = height;
    scaleXChanged();
    scaleYChanged();
  }

  /**
   * Reads the command data from the given record and adjusts the internal parameters according to the data parsed.
   * <p/>
   * After the raw record was read from the datasource, the record is parsed by the concrete implementation.
   *
   * @param record the raw data that makes up the record.
   */
  public void setRecord( final MfRecord record ) {
    final int bottom = record.getParam( POS_BOTTOM );
    final int right = record.getParam( POS_RIGHT );
    final int top = record.getParam( POS_TOP );
    final int left = record.getParam( POS_LEFT );
    setIntersectClipRect( left, top, right - left, bottom - top );
  }

  /**
   * Creates a new record based on the data stored in the MfCommand.
   *
   * @return the created record.
   */
  public MfRecord getRecord() {
    final Rectangle rc = getIntersectClipRect();
    final MfRecord record = new MfRecord( RECORD_SIZE );
    record.setParam( POS_BOTTOM, (int) ( rc.getY() + rc.getHeight() ) );
    record.setParam( POS_RIGHT, (int) ( rc.getX() + rc.getWidth() ) );
    record.setParam( POS_TOP, (int) ( rc.getY() ) );
    record.setParam( POS_LEFT, (int) ( rc.getX() ) );
    return record;
  }

  /**
   * A callback function to inform the object, that the x scale has changed and the internal coordinate values have to
   * be adjusted.
   */
  protected void scaleXChanged() {
    scaled_x = getScaledX( x );
    scaled_width = getScaledX( width );
  }

  /**
   * A callback function to inform the object, that the y scale has changed and the internal coordinate values have to
   * be adjusted.
   */
  protected void scaleYChanged() {
    scaled_y = getScaledY( y );
    scaled_height = getScaledY( height );
  }
}