/*
Copyright 2003-2012 GanttProject Team

This file is part of GanttProject, an opensource project management tool.

GanttProject is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

GanttProject 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with GanttProject.  If not, see <http://www.gnu.org/licenses/>.
 */
package net.sourceforge.ganttproject.print;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.RenderedImage;
import java.awt.print.PageFormat;
import java.awt.print.Printable;

public class GanttPrintable implements Printable {

  public final static double REDUCE_FACTOR_DEFAULT = 1.5d;

  private double reduceFactor;

  /** The image to print */
  private RenderedImage image;

  public GanttPrintable(RenderedImage image, double reduceFactor) {
    super();
    this.image = image;
    this.reduceFactor = reduceFactor < 1.0d ? REDUCE_FACTOR_DEFAULT : reduceFactor;
  }

  /** Print the page */
  @Override
  public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) {
    System.err.println("[GanttPrintable] print(): reduceFactor=" + reduceFactor);
    System.err.println("[GanttPrintable] print(): image: w=" + image.getWidth() + " h=" + image.getHeight());
    System.err.println("[GanttPrintable] print(): page=" + pageIndex);

    int pagesPerRow = (int) (image.getWidth() / reduceFactor / pageFormat.getImageableWidth() + 1);
    int numRows = (int) (image.getHeight() / reduceFactor / pageFormat.getImageableHeight() + 1);

    System.err.println("[GanttPrintable] print(): numrows=" + numRows + " pagesPerRow=" + pagesPerRow);
    int totalPages = pagesPerRow * numRows;
    if (pageIndex >= totalPages) {
      return Printable.NO_SUCH_PAGE;
    }

    int currentRow = pageIndex / pagesPerRow;
    int currentColumn = pageIndex - currentRow * pagesPerRow;
    System.err.println("[GanttPrintable] print(): curentpage=" + currentColumn + " current row=" + currentRow);

    int leftx = (int) (currentColumn * (pageFormat.getImageableWidth() * reduceFactor - 2 / 3 * pageFormat.getImageableX()));
    int topy = (int) (currentRow * pageFormat.getImageableHeight() * reduceFactor);
    System.err.println("[GanttPrintable] print(): leftx=" + leftx + " topy=" + topy);

    Graphics2D g2d = (Graphics2D) graphics;
    g2d.setClip((int) pageFormat.getImageableX(), (int) pageFormat.getImageableY(),
        (int) pageFormat.getImageableWidth(), (int) pageFormat.getImageableHeight());

    AffineTransform transform = AffineTransform.getScaleInstance(1 / reduceFactor, 1 / reduceFactor);
    transform.translate(pageFormat.getImageableX() - leftx, pageFormat.getImageableY() - topy);
    g2d.drawRenderedImage(image, transform);

    return Printable.PAGE_EXISTS;
  }
}