// +-------------------------------------------------------------------
// | Author: Tim Van Wassenhove <timvw@users.sourceforge.net>
// | Update: 2006-06-01 11:00
// +-------------------------------------------------------------------
package be.timvw.util;

import java.awt.Color;
import java.awt.Container;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.print.PageFormat;
import java.awt.print.Pageable;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import java.awt.print.PrinterJob;

/**
 * This class represents a printer of lines
 */
public class LinesPrinter implements Pageable, Printable {
	private String[] lines;
	private PageFormat pf;
	private Font f;
	private FontMetrics fm;
		
	/**
	 * Prints the given lines on the default printer
	 * @param lines - the lines involved
	 */
	public static void print(String[] lines) {
		PrinterJob pj = PrinterJob.getPrinterJob();
		pj.setPageable(new LinesPrinter(lines));
		
		try {
			pj.print();		
		} catch (PrinterException pe) { 
			//
		}
	}
	
	/**
	 * Constructor
	 * @param lines - the lines to print
	 */
	public LinesPrinter(String[] lines) {
		this.lines = lines;
		pf = new PageFormat();
		f = new Font(null, Font.PLAIN, 12);
		fm = new Container().getFontMetrics(f);
	}

	/**
	 * Returns the number of lines that can be printed per page
	 * @return <b>int</b> a number
	 */
	private int getLinesPerPage() {
		return (int) pf.getImageableHeight() / fm.getHeight();
	}

	/**
	 * Returns the number of pages in the set
	 * @return <b>int</b> the number of pages in this Pageable
	 */
	public int getNumberOfPages() {
		return (int) ((lines.length * fm.getHeight()) / pf.getImageableHeight()) + 1;
	}

	/**
	 * Returns the PageFormat of the page specified by pageIndex
	 * @return <b>PageFormat</b> a the PageFormat describing the size and orientation
	 */
	public PageFormat getPageFormat(int pageIndex) {
		return pf; 
	}

	/**
	 * Returns the Printable instance responsible for rendering the page specified by pageIndex
	 * @param pageIndex - the page involved
	 * @return <b>Pritnable</b> a printable object
	 */
	public Printable getPrintable(int pageIndex) {
		return this;
	}

	/**
	 * Prints the page at the specified index into the specified Graphics context in the specified format
	 * @param g - the context into which the page is drawn
	 * @param pf - the size and orientation of the page being drawn
	 * @param pi - the zero based index of the page to be drawn
	 * @return <b>int</b> PAGE_EXISTS if the page is rendered successfully or NO_SUCH_PAGE if pageIndex specifies a non-existent page
	 */
	public int print(Graphics g, PageFormat pf, int pi) throws PrinterException {
		if (pi < 0 || pi >= getNumberOfPages()) { return Printable.NO_SUCH_PAGE; }

		Graphics2D g2 = (Graphics2D) g;
		g2.translate(pf.getImageableX(), pf.getImageableY());
		g2.setFont(f);
		g2.setColor(Color.BLACK);

		int height = fm.getHeight();	
		int posx = 0;	
		int posy = height; 

		int begin = pi * getLinesPerPage();
		int end = begin + getLinesPerPage();
		if (pi == getNumberOfPages() - 1) {
			end = lines.length;
		}

		for (int i = begin; i < end; ++i, posy += height) {
			int j = lines[i].indexOf("\t");
			if (j != -1) {
				g2.drawString(lines[i].substring(0, j), posx, posy);
				String part2 = lines[i].substring(j + 1);
				int posx2 = (int) pf.getImageableWidth() - fm.stringWidth(part2);
				g2.drawString(part2, posx2, posy);
			} else {
				g2.drawString(lines[i], posx, posy);
			}
		}

		return Printable.PAGE_EXISTS;
	}
}