/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2011 by Rapid-I and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapid-i.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package com.rapidminer.gui.flow;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;

import javax.swing.JPanel;

import com.rapidminer.gui.MainFrame;
import com.rapidminer.gui.tools.ResourceDockKey;
import com.vlsolutions.swing.docking.DockKey;
import com.vlsolutions.swing.docking.Dockable;
/**
 * 
 * @author Simon Fischer
 */
public class OverviewPanel extends JPanel implements Dockable {
	
	private static final long serialVersionUID = 1L;

	private static final Color FILL_COLOR = new Color(140, 140, 200, 30);
	
	private static final Color DRAW_COLOR = new Color(140, 140, 200);
	
	private final ProcessRenderer processRenderer;
	
	private Point dragStartMousePos;
	private Rectangle dragStartRect;
	private double scale = 1d;
	
	public OverviewPanel(ProcessRenderer processRenderer) {
		this.processRenderer = processRenderer;
		addMouseListener(new MouseAdapter() {
			@Override
			public void mousePressed(MouseEvent e) {
				dragStartMousePos = e.getPoint();
				dragStartRect = OverviewPanel.this.processRenderer.getVisibleRect();
			}
		});
		addMouseMotionListener(new MouseMotionListener() {
			@Override
			public void mouseDragged(MouseEvent e) {
				double diffX = (e.getX() - dragStartMousePos.getX())/scale;
				double diffY = (e.getY() - dragStartMousePos.getY())/scale; 
				OverviewPanel.this.processRenderer.scrollRectToVisible(new Rectangle(
						(int)(dragStartRect.getX() + diffX), 
						(int)(dragStartRect.getY() + diffY),
						(int)(dragStartRect.getWidth()),
						(int)(dragStartRect.getHeight())));
			}

			@Override public void mouseMoved(MouseEvent e) { }			
		});
	}

	@Override
	protected void paintComponent(Graphics graphics) {
		super.paintComponent(graphics);
		double scaleX = (double)getWidth() / (double)processRenderer.getWidth();
		double scaleY = (double)getHeight() / (double)processRenderer.getHeight();
		scale = Math.min(scaleX, scaleY);
		double scaledW = processRenderer.getWidth() * scale;
		double scaledH = processRenderer.getHeight() * scale;
			
		Graphics2D g = (Graphics2D) graphics.create();
		g.translate((getWidth() - scaledW)/2d, (getHeight() - scaledH)/2d);
		g.scale(scale, scale);		
		processRenderer.paintComponent(g);

		g.setStroke(new BasicStroke((int)(1d/scale)));
		
		Rectangle visibleRect = processRenderer.getVisibleRect();
		Rectangle drawRect = new Rectangle((int)visibleRect.getX(), (int)visibleRect.getY(), (int)visibleRect.getWidth() - 1, (int)visibleRect.getHeight() - 1);


		g.setColor(FILL_COLOR);
		g.fill(drawRect);
		
		g.setColor(DRAW_COLOR);
		g.draw(drawRect);
		
		g.dispose();		
	}
		
	public static final String OVERVIEW_DOCK_KEY = "overview";
	private final DockKey DOCK_KEY = new ResourceDockKey(OVERVIEW_DOCK_KEY);
	{
		DOCK_KEY.setDockGroup(MainFrame.DOCK_GROUP_ROOT);
	}

	@Override
	public Component getComponent() {
		return this;
	}

	@Override
	public DockKey getDockKey() {
		return DOCK_KEY;
	}
	
}