package org.jtheque.utils.print;

 /*

  * This file is part of JTheque.

  *

  * JTheque 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.

  *

  * JTheque 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 JTheque.  If not, see <http://www.gnu.org/licenses/>.

  */

 import java.awt.FontMetrics;

 import java.awt.Graphics;

 import java.awt.print.PageFormat;

 import java.awt.print.Pageable;

 import java.awt.print.Printable;

 import java.util.ArrayList;

 import java.util.Collection;

 import java.util.List;

 /**

  * This class permit to print an array of lines.

  *

  * @author Baptiste Wicht

  */

 final class ArrayPrinter implements Pageable {

     private final List<String> list;

     private int nbreElementsByPage;

     private final int numberOfPages;

     private final PageFormat format;

     private static final int LINE_HEIGHT = 14;

     private static final int HEIGHT_MARGIN = 150;

     /**

      * Construct a new <code>ArrayPrinter</code> with a list of lines.

      *

      * @param list The list of the lines we want to print

      */

     ArrayPrinter(Collection<String> list) {

         super();

         this.list = new ArrayList<String>(list);

         format = new PageFormat();

         format.setOrientation(PageFormat.PORTRAIT);

         format.setPaper(new A4());

         nbreElementsByPage = (int) Math.floor((format.getImageableHeight() - HEIGHT_MARGIN) / LINE_HEIGHT);

         numberOfPages = list.size() / nbreElementsByPage;

     }

     @Override

     public int getNumberOfPages() {

         return numberOfPages;

     }

     @Override

     public PageFormat getPageFormat(int pageIndex) {

         return format;

     }

     @Override

     public Printable getPrintable(int pageIndex) {

         if (pageIndex > numberOfPages) {

             throw new IndexOutOfBoundsException();

         }

         int start = nbreElementsByPage * pageIndex;

         int stop = nbreElementsByPage * (pageIndex + 1) - 1;

         stop = Math.max(stop, list.size());

         return new ArrayPrintable(start, stop);

     }

     /**

      * A printable for an array of lines.

      *

      * @author Baptiste Wicht

      */

     private final class ArrayPrintable implements Printable {

         private int start;

         private final int stop;

         private static final int MARGIN = 75;

         private static final int FONT_SIZE = 12;

         /**

          * Construct a new ArrayPrintable.

          *

          * @param start The start index.

          * @param stop  The end index.

          */

         private ArrayPrintable(int start, int stop) {

             super();

             this.start = start;

             this.stop = stop;

         }

         @Override

         public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) {

             FontMetrics metrics = graphics.getFontMetrics();

             graphics.setFont(graphics.getFont().deriveFont(FONT_SIZE));

             int increment = metrics.getHeight() + 2;

             if (nbreElementsByPage == 0) {

                 double heightPg = pageFormat.getImageableHeight();

                 nbreElementsByPage = (int) (heightPg / increment);

             }

             if (pageIndex >= numberOfPages) {

                 return NO_SUCH_PAGE;

             } else {

                 int vertical = MARGIN;

                 while (start <= stop) {

                     vertical += increment;

                     graphics.drawString(list.get(start), MARGIN, vertical);

                     start++;

                 }

                 return PAGE_EXISTS;

             }

         }

     }

 }