package net.sourceforge.tuned.ui;


import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Point;
import java.awt.Window;
import java.awt.dnd.DnDConstants;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;

import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.KeyStroke;
import javax.swing.ListSelectionModel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
import javax.swing.event.MouseInputListener;
import javax.swing.plaf.basic.BasicTableUI;
import javax.swing.text.JTextComponent;
import javax.swing.undo.UndoManager;


public final class TunedUtilities {
	
	public static final Color TRANSLUCENT = new Color(255, 255, 255, 0);
	

	public static void checkEventDispatchThread() {
		if (!SwingUtilities.isEventDispatchThread()) {
			throw new IllegalStateException("Method must be accessed from the Swing Event Dispatch Thread, but was called on Thread \"" + Thread.currentThread().getName() + "\"");
		}
	}
	

	public static Color derive(Color color, float alpha) {
		return new Color(((int) ((alpha * 255)) << 24) | (color.getRGB() & 0x00FFFFFF), true);
	}
	

	public static JButton createImageButton(Action action) {
		JButton button = new JButton(action);
		button.setHideActionText(true);
		button.setOpaque(false);
		
		return button;
	}
	

	public static void installAction(JComponent component, KeyStroke keystroke, Action action) {
		Object key = action.getValue(Action.NAME);
		
		if (key == null)
			throw new IllegalArgumentException("Action must have a name");
		
		component.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT).put(keystroke, key);
		component.getActionMap().put(key, action);
	}
	

	public static UndoManager installUndoSupport(JTextComponent component) {
		final UndoManager undoSupport = new UndoManager();
		
		// install undo listener
		component.getDocument().addUndoableEditListener(undoSupport);
		
		// install undo action
		installAction(component, KeyStroke.getKeyStroke("control Z"), new AbstractAction("Undo") {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				if (undoSupport.canUndo())
					undoSupport.undo();
			}
		});
		
		// install redo action
		installAction(component, KeyStroke.getKeyStroke("control Y"), new AbstractAction("Redo") {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				if (undoSupport.canRedo())
					undoSupport.redo();
			}
		});
		
		return undoSupport;
	}
	

	public static boolean isMaximized(Frame frame) {
		return (frame.getExtendedState() & Frame.MAXIMIZED_BOTH) != 0;
	}
	

	public static Window getWindow(Object component) {
		if (component instanceof Window)
			return (Window) component;
		
		if (component instanceof Component)
			return SwingUtilities.getWindowAncestor((Component) component);
		
		return null;
	}
	

	public static Point getOffsetLocation(Window owner) {
		if (owner == null) {
			Window[] toplevel = Window.getOwnerlessWindows();
			
			if (toplevel.length == 0)
				return new Point(120, 80);
			
			// assume first top-level window as point of reference
			owner = toplevel[0];
		}
		
		Point p = owner.getLocation();
		Dimension d = owner.getSize();
		
		return new Point(p.x + d.width / 4, p.y + d.height / 7);
	}
	

	public static Image getImage(Icon icon) {
		if (icon == null)
			return null;
		
		if (icon instanceof ImageIcon)
			return ((ImageIcon) icon).getImage();
		
		// draw icon into a new image
		BufferedImage image = new BufferedImage(icon.getIconWidth(), icon.getIconHeight(), BufferedImage.TYPE_INT_ARGB);
		
		Graphics2D g2d = image.createGraphics();
		icon.paintIcon(null, g2d, 0, 0);
		g2d.dispose();
		
		return image;
	}
	

	public static Dimension getDimension(Icon icon) {
		return new Dimension(icon.getIconWidth(), icon.getIconHeight());
	}
	

	public static Timer invokeLater(int delay, final Runnable runnable) {
		Timer timer = new Timer(delay, new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				runnable.run();
			}
		});
		
		timer.setRepeats(false);
		timer.start();
		
		return timer;
	}
	

	/**
	 * When trying to drag a row of a multi-select JTable, it will start selecting rows instead
	 * of initiating a drag. This TableUI will give the JTable proper dnd behaviour.
	 */
	public static class DragDropRowTableUI extends BasicTableUI {
		
		@Override
		protected MouseInputListener createMouseInputListener() {
			return new DragDropRowMouseInputHandler();
		}
		

		protected class DragDropRowMouseInputHandler extends MouseInputHandler {
			
			@Override
			public void mouseDragged(MouseEvent e) {
				// Only do special handling if we are drag enabled with multiple selection
				if (table.getDragEnabled() && table.getSelectionModel().getSelectionMode() == ListSelectionModel.MULTIPLE_INTERVAL_SELECTION) {
					table.getTransferHandler().exportAsDrag(table, e, DnDConstants.ACTION_COPY);
				} else {
					super.mouseDragged(e);
				}
			}
		}
	}
	

	/**
	 * Dummy constructor to prevent instantiation.
	 */
	private TunedUtilities() {
		throw new UnsupportedOperationException();
	}
	
}