package ie.dcu.apps.ist.actions;


import ie.dcu.apps.ist.views.SegmentationView;
import ie.dcu.segment.SegmentationContext;
import ie.dcu.segment.painters.SegmentationPainter;
import ie.dcu.swt.ObservableImage;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.printing.*;
import org.eclipse.swt.widgets.Display;

/**
 * Send current view to printer.
 * 
 * @author Kevin McGuinness
 */
public class PrintAction extends AppAction {
	
	private static final String JOB_NAME = "Interactive Segmentation Tool";
	private PrintDialog dialog;
	
	public PrintAction(ActionManager m) {
		super(m);
	}

	@Override 
	public void run() { 
		if (window.hasContext()) {
			status("Printing...");
			PrinterData data = getPrintData();
			if (data != null) {
				print(data);
				status("Printing complete");
			} else {
				status(null);
			}
		}
	}
	
	
	private PrinterData getPrintData() {
		createPrintDialog();
		return dialog.open();
	}


	private void print(PrinterData data) {
		Printer printer = new Printer(data);
		try {
			print(printer);
			
		} finally {
			printer.dispose();
		}
	}


	private void print(Printer printer) {
		if (printer.startJob(JOB_NAME)) {
			if (printer.startPage()) {
				GC gc = new GC(printer);
				try {
					paint(gc, printer);
				} finally {
					gc.dispose();
				}
				printer.endPage();
			}
			printer.endJob();
		}
	}

	
	private void paint(GC gc, Printer printer) {
		Image im = paintContext();
		try {
			gc.drawImage(im, 30, 30);
		} finally {
			im.dispose();
		}
	}
	

	private void createPrintDialog() {
		if (dialog == null) {
			dialog = new PrintDialog(window.getShell(), SWT.SHEET);
		}
	}
	
	
	private Image paintContext() {
		SegmentationView view = window.getView();
		SegmentationContext ctx = window.getContext();
		SegmentationPainter painter = view.getPainter();
		ObservableImage im = createCompatibleImage(ctx);
		painter.paint(ctx, im);
		return im.getImage();
	}
	
	
	private ObservableImage createCompatibleImage(SegmentationContext ctx) {
		Image im = new Image(Display.getCurrent(), ctx.getBounds());
		return new ObservableImage(im);
	}
}