/* SelectChannelSignalTool.java created 2007-10-04
 *
 */

package org.signalml.app.view.signal;

import java.awt.Cursor;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.io.InvalidClassException;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.swing.SwingUtilities;

import org.signalml.app.util.IconUtils;
import org.signalml.plugin.export.signal.AbstractSignalTool;
import org.signalml.plugin.export.signal.SignalSelection;
import org.signalml.plugin.export.signal.SignalSelectionType;

/** SelectChannelSignalTool
 *
 *
 * @author Michal Dobaczewski © 2007-2008 CC Otwarte Systemy Komputerowe Sp. z o.o.
 */
public class SelectChannelSignalTool extends AbstractSignalTool implements SelectionSignalTool {

	public Float startPosition;

	/**
	 * The channel on which the current selection was started.
	 */
	private Integer channel = null;
	private SignalPlot plot;

	public SelectChannelSignalTool(SignalView signalView) {
		super(signalView);
	}

	@Override
	public Cursor getDefaultCursor() {
		return IconUtils.getCrosshairCursor();
	}

	@Override
	public SignalSelectionType getSelectionType() {
		return SignalSelectionType.CHANNEL;
	}

	@Override
	public void mousePressed(MouseEvent e) {

		if (SwingUtilities.isLeftMouseButton(e)) {

			Object source = e.getSource();
			if (!(source instanceof SignalPlot)) {
				plot = null;
				return;
			}
			plot = (SignalPlot) source;

			Point point = e.getPoint();
			startPosition = plot.toTimeSpace(point);
			channel = plot.toChannelSpace(point);

			setEngaged(true);
			e.consume();
		}

	}

	@Override
	public void mouseReleased(MouseEvent e) {
		if (SwingUtilities.isLeftMouseButton(e)) {
			selectTo(e.getPoint());
			startPosition = null;
			setEngaged(false);
			plot = null;
			e.consume();
		}
	}

	@Override
	public void mouseDragged(MouseEvent e) {
		if (SwingUtilities.isLeftMouseButton(e)) {
			Point point = e.getPoint();
			selectTo(point);
			Rectangle r = new Rectangle(point.x, point.y, 1, 1);
			((SignalPlot)e.getSource()).scrollRectToVisible(r);
		}
	}

	private void selectTo(Point point) {
		if (startPosition != null) {
			Float endPosition = plot.toTimeSpace(point);
			if (endPosition != null) {
				if (startPosition.equals(endPosition)) {
					getSignalView().clearSignalSelection();
				} else {
					if (channel != null) {

						int currentChannel = plot.toChannelSpace(point);

						if (Math.abs((currentChannel - channel)) > 0)
							currentChannel = SignalSelection.CHANNEL_NULL;
						else
							currentChannel = channel;

						try {
							getSignalView().setSignalSelection(plot, plot.getChannelSelection(startPosition, endPosition, currentChannel));
						} catch (InvalidClassException ex) {
							//ignore
						}

					}
				}
			}
		}
	}

}