/*
 * @(#)MDIDesktopPane.java
 *
 * Project:		JHotdraw - a GUI framework for technical drawings
 *				http://www.jhotdraw.org
 *				http://jhotdraw.sourceforge.net
 * Copyright:	© by the original author(s) and all contributors
 * License:		Lesser GNU Public License (LGPL)
 *				http://www.opensource.org/licenses/lgpl-license.html
 */

package CH.ifa.draw.contrib;

import CH.ifa.draw.framework.DrawingView;
import CH.ifa.draw.application.DrawApplication;

import javax.swing.*;
import javax.swing.event.InternalFrameListener;
import javax.swing.event.InternalFrameAdapter;
import javax.swing.event.InternalFrameEvent;
import java.awt.*;
import java.beans.*;

/**
 * An extension of JDesktopPane that supports often used MDI functionality. This
 * class also handles setting scroll bars for when windows move too far to the left or
 * bottom, providing the MDIDesktopPane is in a ScrollPane.
 * Note by dnoyeb: I dont know why the container does not fire frame close events when the frames
 * are removed from the container with remove as opposed to simply closed with the
 * "x".  so if you say removeAll from container you wont be notified.  No biggie.
 *
 * @author Wolfram Kaiser (adapted from an article in JavaWorld)
 * @author  C.L.Gilbert <dnoyeb@sourceforge.net>
 * @version <$CURRENT_VERSION$>
 */
public class MDIDesktopPane extends JDesktopPane implements Desktop {
	private static int FRAME_OFFSET=20;
	private MDIDesktopManager manager;
	private DrawApplication myDrawApplication;

	/**
	 * You need this if you are not using a component that inherits from
	 * JComponent
	 */
	//private final EventListenerList listenerList = new EventListenerList();
	private DrawingView selectedView;

	public MDIDesktopPane(DrawApplication newDrawApplication) {
		setDrawApplication(newDrawApplication);
		manager=new MDIDesktopManager(this);
		setDesktopManager(manager);
		setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
		setAlignmentX(JComponent.LEFT_ALIGNMENT);
	}

	protected InternalFrameListener internalFrameListener = new InternalFrameAdapter() {
	    /**
	     * Invoked when a internal frame has been opened.
         * @see javax.swing.JInternalFrame#show
		 * if dv is null assert
         */
	    public void internalFrameOpened(InternalFrameEvent e) {
			DrawingView dv = Helper.getDrawingView(e.getInternalFrame());
			fireDrawingViewAddedEvent(dv);
	    }

		/**
		 * Invoked when an internal frame is in the process of being closed.
		 * The close operation can be overridden at this point.
		 * @see javax.swing.JInternalFrame#setDefaultCloseOperation
		 */
		//public void internalFrameClosing(InternalFrameEvent e) {
		//}

		/**
		 * Invoked when an internal frame has been closed.
		 * if dv is null assert
                 *
		 * @see javax.swing.JInternalFrame#setClosed
		 */
		public void internalFrameClosed(InternalFrameEvent e) {
			DrawingView dv = Helper.getDrawingView(e.getInternalFrame());
			fireDrawingViewRemovedEvent(dv);
		}

		/**
		 * Invoked when an internal frame is iconified.
		 * @see javax.swing.JInternalFrame#setIcon
		 */
		//public void internalFrameIconified(InternalFrameEvent e) {
		//}

		/**
		 * Invoked when an internal frame is de-iconified.
		 * @see javax.swing.JInternalFrame#setIcon
		 */
		//public void internalFrameDeiconified(InternalFrameEvent e) {
		//}

		/**
		 * Invoked when an internal frame is activated.
		 * @see javax.swing.JInternalFrame#setSelected
		 * if this frame has a null drawingView then assert
		 * because their should be no null frames being selected
		 * this does not include NullDrawingView which is acceptable
		 */
		public void internalFrameActivated(InternalFrameEvent e) {
			DrawingView dv = Helper.getDrawingView(e.getInternalFrame());
			setActiveDrawingView(dv);
		}

		public void internalFrameDeactivated(InternalFrameEvent e) {
			if (getComponentCount() == 0){ //could be a component without a DrawingView.  should use helper here.
				setActiveDrawingView(null); //mrfloppy, investigate using NullDrawingView here please.( i will assist)
			}                
		}
	};


	private void fireDrawingViewAddedEvent(final DrawingView dv) {
		final Object[] listeners = listenerList.getListenerList();
		DesktopListener dpl;
		DesktopEvent dpe = null;
		for (int i = listeners.length-2; i >= 0; i -= 2) {
			if (listeners[i] == DesktopListener.class) {
				if (dpe == null) {
					dpe = new DesktopEvent(MDIDesktopPane.this, dv);
				}
				dpl = (DesktopListener)listeners[i+1];
				dpl.drawingViewAdded(dpe);
			}
		}
	}

	private void fireDrawingViewRemovedEvent(final DrawingView dv) {
		final Object[] listeners = listenerList.getListenerList();
		DesktopListener dpl;
		DesktopEvent dpe= null;
		for (int i = listeners.length-2; i >= 0; i -= 2) {
			if (listeners[i] == DesktopListener.class) {
				if (dpe == null) {
					dpe = new DesktopEvent(MDIDesktopPane.this, dv);
				}
				dpl = (DesktopListener)listeners[i+1];
				dpl.drawingViewRemoved(dpe);
			}
		}
	}

	private void fireDrawingViewSelectedEvent(final DrawingView oldView, final DrawingView newView) {
		final Object[] listeners = listenerList.getListenerList();
		DesktopListener dpl;
		DesktopEvent dpe = null;
		for (int i = listeners.length-2; i >= 0; i -= 2) {
			if (listeners[i] == DesktopListener.class) {
				if (dpe == null) {
					dpe = new DesktopEvent(MDIDesktopPane.this, newView);
				}
				dpl = (DesktopListener)listeners[i+1];
				dpl.drawingViewSelected(oldView,dpe);
			}
		}
	}

/*	public void setBounds(int x, int y, int w, int h) {
		super.setBounds(x,y,w,h);
		checkDesktopSize();
	}
*/

	protected Component createContents(DrawingView dv) {
		JScrollPane sp = new JScrollPane((Component) dv);
		sp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
		sp.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
		sp.setAlignmentX(LEFT_ALIGNMENT);

		String applicationTitle;
		if (dv.drawing().getTitle() == null) {
			applicationTitle = getDrawApplication().getApplicationName() + " - " + getDrawApplication().getDefaultDrawingTitle();
		}
		else {
			applicationTitle = getDrawApplication().getApplicationName() + " - " + dv.drawing().getTitle();
		}
		JInternalFrame internalFrame = new JInternalFrame(applicationTitle, true, true, true, true);
		internalFrame.setName(applicationTitle);
		internalFrame.getContentPane().add(sp);
		internalFrame.setSize(200,200);
		return internalFrame;
	}

	public DrawingView getActiveDrawingView() {
		return selectedView;
	}

	protected void setActiveDrawingView(DrawingView newSelectedView) {
            DrawingView oldSelectedView = selectedView;
            selectedView = newSelectedView;
            fireDrawingViewSelectedEvent(oldSelectedView, newSelectedView);
	}

	public void updateTitle(String newDrawingTitle) {
		getSelectedFrame().setTitle(newDrawingTitle);
	}

	/**
	 * This must match the signature of the superclass it is overriding or the
	 * method invocation may not resolve to this method unless it is called on
	 * a reference of specifically MDIDesktopPane type.  So this must be
	 * Component add(Component comp) in order to override its super class and
	 * Component add(JInternalFrame frame) will not properly override the super-
	 * class, but instead overload it.
	 *
	 * Note be sure to call this method and not add() when you want to add to the
	 * desktop.  This allows complex desktops to be created.  For instance, you can
	 * add split panes and scroll panes and such as normal with the add() method
	 * but then to get to the actual desktop you would still call this method.
	 */
	public void addToDesktop(DrawingView dv, int location) {
		JInternalFrame frame = (JInternalFrame)createContents(dv);
		JInternalFrame[] array = getAllFrames();
		Point p = null;
		int w;
		int h;

		frame.addInternalFrameListener(internalFrameListener);//should be done before added to desktop
		Component retval = super.add(frame);

		checkDesktopSize();
		if (array.length > 0) {
			p = array[0].getLocation();
			p.x = p.x + FRAME_OFFSET;
			p.y = p.y + FRAME_OFFSET;
		}
		else {
			p = new Point(0, 0);
		}
		frame.setLocation(p.x, p.y);
		if (frame.isResizable()) {
			w = getWidth() - (getWidth() / 3);
			h = getHeight() - (getHeight() / 3);
			if (w < frame.getMinimumSize().getWidth()) {
				w = (int)frame.getMinimumSize().getWidth();
			}
			if (h < frame.getMinimumSize().getHeight()) {
				h = (int)frame.getMinimumSize().getHeight();
			}
			frame.setSize(w, h);
		}
		moveToFront(frame);
		frame.setVisible(true);
		try {
			frame.setSelected(true);
		}
		catch (PropertyVetoException e) {
			frame.toBack();
		}
	}

	public void removeFromDesktop(DrawingView dv, int location) {
		Component[] comps = getComponents();
		for (int x=0; x<comps.length; x++) {
			if (dv == Helper.getDrawingView(comps[x])) {
				((JInternalFrame)comps[x]).dispose();
			    break;
			}
		}
		checkDesktopSize();
	}

	public void removeAllFromDesktop(int location) {
		JInternalFrame[] jifs = getAllFrames();
		for (int x=0; x < jifs.length; x++) {
			jifs[x].dispose();
		}
	}

	public DrawingView[] getAllFromDesktop(int location){
		Component[] comps = getComponents();
		java.util.ArrayList al = new java.util.ArrayList();
		for (int x=0; x<comps.length; x++) {
			DrawingView dv = Helper.getDrawingView(comps[x]);
			if (dv != null) {
				al.add(dv);
			}
		}
		DrawingView[] dvs = new DrawingView[al.size()];
		al.toArray(dvs);
		return dvs;
	}
/*
	public void setSelectedDrawingView(DrawingView dv) {
		Component[] comps = getComponents();
		for (int x=0; x < comps.length; x++) {
			DrawingView dv2 = Helper.getDrawingView(comps[x]);
		    if (dv == dv2) {
				JInternalFrame frame = (JInternalFrame)comps[x];
				try {
					//moveToFront(frame);
					frame.setSelected(true);
				}
				catch(java.beans.PropertyVetoException pve) {
				    System.out.println(pve);
				}
		    }
		}
	}
*/
	public void addDesktopListener(DesktopListener dpl){
		listenerList.add(DesktopListener.class, dpl);
	}

	public void removeDesktopListener(DesktopListener dpl){
	    listenerList.remove(DesktopListener.class, dpl);
	}

	/**
	 * Cascade all internal frames
	 */
	public void cascadeFrames() {
		int x = 0;
		int y = 0;
		JInternalFrame[] allFrames = getAllFrames();

		// do nothing if no frames to work with
		if (allFrames.length == 0) {
			return;
		}

		manager.setNormalSize();

		int frameHeight = (getBounds().height - 5) - allFrames.length * FRAME_OFFSET;
		int frameWidth = (getBounds().width - 5) - allFrames.length * FRAME_OFFSET;
		for (int i = allFrames.length - 1; i >= 0; i--) {
			try {
				allFrames[i].setMaximum(false);
			}
			catch (PropertyVetoException e) {
				e.printStackTrace();
			}

			allFrames[i].setBounds(x, y, frameWidth, frameHeight);
			x = x + FRAME_OFFSET;
			y = y + FRAME_OFFSET;
		}

		checkDesktopSize();
	}

	/**
	 * Tile all internal frames<br>
	 *
	 * @deprecated use tileFramesHorizontally() instead
	 *
	 */
	public void tileFrames() {
		tileFramesHorizontally();
	}

	public void tileFramesHorizontally() {
		Component[] allFrames = getAllFrames();

		// do nothing if no frames to work with
		if (allFrames.length == 0) {
			return;
		}

		manager.setNormalSize();

		int frameHeight = getBounds().height/allFrames.length;
		int y = 0;
		for (int i = 0; i < allFrames.length; i++) {
			try {
				((JInternalFrame)allFrames[i]).setMaximum(false);
			}
			catch (PropertyVetoException e) {
				e.printStackTrace();
			}

			allFrames[i].setBounds(0, y, getBounds().width,frameHeight);
			y = y + frameHeight;
		}

		checkDesktopSize();
	}

	public void tileFramesVertically() {
		Component[] allFrames = getAllFrames();

		// do nothing if no frames to work with
		if (allFrames.length == 0) {
			return;
		}
		manager.setNormalSize();

		int frameWidth = getBounds().width/allFrames.length;
		int x = 0;
		for (int i = 0; i < allFrames.length; i++) {
			try {
				((JInternalFrame)allFrames[i]).setMaximum(false);
			}
			catch (PropertyVetoException e) {
				e.printStackTrace();
			}

			allFrames[i].setBounds(x, 0, frameWidth, getBounds().height);
			x = x + frameWidth;
		}

		checkDesktopSize();
	}

	/**
	 * Arranges the frames as efficiently as possibly with preference for
	 * keeping vertical size maximal.<br>
	 *
	 */
	public void arrangeFramesVertically() {
		Component[] allFrames = getAllFrames();
		// do nothing if no frames to work with
		if (allFrames.length == 0) {
			return;
		}

		manager.setNormalSize();

		int vertFrames = (int)Math.floor(Math.sqrt(allFrames.length));
		int horFrames = (int)Math.ceil(Math.sqrt(allFrames.length));

		// first arrange the windows that have equal size
		int frameWidth = getBounds().width / horFrames;
		int frameHeight = getBounds().height / vertFrames;
		int x = 0;
		int y = 0;
		int frameIdx = 0;
		for (int horCnt = 0; horCnt < horFrames-1; horCnt++) {
			y = 0;
			for (int vertCnt = 0; vertCnt < vertFrames; vertCnt++) {
				try {
					((JInternalFrame)allFrames[frameIdx]).setMaximum(false);
				}
				catch (PropertyVetoException e) {
					e.printStackTrace();
				}

				allFrames[frameIdx].setBounds(x, y, frameWidth, frameHeight);
				frameIdx++;
				y = y + frameHeight;
			}
			x = x + frameWidth;
		}

		// the rest of the frames are tiled down on the last column with equal
		// height
		frameHeight = getBounds().height / (allFrames.length - frameIdx);
		y = 0;
		for (; frameIdx < allFrames.length; frameIdx++)
		{
			try {
				((JInternalFrame)allFrames[frameIdx]).setMaximum(false);
			}
			catch (PropertyVetoException e) {
				e.printStackTrace();
			}

			allFrames[frameIdx].setBounds(x, y, frameWidth, frameHeight);
			y = y + frameHeight;
		}

		checkDesktopSize();
	}

	/**
	 * Arranges the frames as efficiently as possibly with preference for
	 * keeping horizontal size maximal.<br>
	 *
	 */
	public void arrangeFramesHorizontally() {
		Component[] allFrames = getAllFrames();
		// do nothing if no frames to work with
		if (allFrames.length == 0) {
			return;
		}

		manager.setNormalSize();

		int vertFrames = (int)Math.ceil(Math.sqrt(allFrames.length));
		int horFrames = (int)Math.floor(Math.sqrt(allFrames.length));

		// first arrange the windows that have equal size
		int frameWidth = getBounds().width / horFrames;
		int frameHeight = getBounds().height / vertFrames;
		int x = 0;
		int y = 0;
		int frameIdx = 0;
		for (int vertCnt = 0; vertCnt < vertFrames-1; vertCnt++) {
			x = 0;
			for (int horCnt = 0; horCnt < horFrames; horCnt++) {
				try {
					((JInternalFrame)allFrames[frameIdx]).setMaximum(false);
				}
				catch (PropertyVetoException e) {
					e.printStackTrace();
				}

				allFrames[frameIdx].setBounds(x, y, frameWidth, frameHeight);
				frameIdx++;
				x = x + frameWidth;
			}
			y = y + frameHeight;
		}

		// the rest of the frames are tiled down on the last column with equal
		// height
		frameWidth = getBounds().width / (allFrames.length - frameIdx);
		x = 0;
		for (; frameIdx < allFrames.length; frameIdx++) {
			try {
				((JInternalFrame)allFrames[frameIdx]).setMaximum(false);
			}
			catch (PropertyVetoException e) {
				e.printStackTrace();
			}

			allFrames[frameIdx].setBounds(x, y, frameWidth, frameHeight);
			x = x + frameWidth;
		}

		checkDesktopSize();
	}

	/**
	 * Sets all component size properties ( maximum, minimum, preferred)
	 * to the given dimension.
	 */
	public void setAllSize(Dimension d) {
		setMinimumSize(d);
		setMaximumSize(d);
		setPreferredSize(d);
		setBounds(0, 0, d.width, d.height);
	}

	/**
	 * Sets all component size properties ( maximum, minimum, preferred)
	 * to the given width and height.
	 */
	public void setAllSize(int width, int height) {
		setAllSize(new Dimension(width,height));
	}

	private void checkDesktopSize() {
		if (getParent()!=null&&isVisible()) manager.resizeDesktop();
	}

	private void setDrawApplication(DrawApplication newDrawApplication) {
		myDrawApplication = newDrawApplication;
	}

	protected DrawApplication getDrawApplication() {
		return myDrawApplication;
	}
}

/**
 * Private class used to replace the standard DesktopManager for JDesktopPane.
 * Used to provide scrollbar functionality.
 */
class MDIDesktopManager extends DefaultDesktopManager {
	private MDIDesktopPane desktop;

	public MDIDesktopManager(MDIDesktopPane newDesktop) {
		this.desktop = newDesktop;
	}

	public void endResizingFrame(JComponent f) {
		super.endResizingFrame(f);
		resizeDesktop();
	}

	public void endDraggingFrame(JComponent f) {
		super.endDraggingFrame(f);
		resizeDesktop();
	}

	public void setNormalSize() {
		JScrollPane scrollPane = getScrollPane();
		Insets scrollInsets = getScrollPaneInsets();

		if (scrollPane != null) {
			Dimension d = scrollPane.getVisibleRect().getSize();
			if (scrollPane.getBorder() != null) {
			   d.setSize(d.getWidth() - scrollInsets.left - scrollInsets.right,
						 d.getHeight() - scrollInsets.top - scrollInsets.bottom);
			}

			d.setSize(d.getWidth() - 20, d.getHeight() - 20);
			desktop.setAllSize(d);
			scrollPane.invalidate();
			scrollPane.validate();
		}
	}

	private Insets getScrollPaneInsets() {
		JScrollPane scrollPane = getScrollPane();
		if ((scrollPane == null) || (getScrollPane().getBorder() == null)) {
			return new Insets(0, 0, 0, 0);
		}
		else {
			return getScrollPane().getBorder().getBorderInsets(scrollPane);
		}
	}

	public JScrollPane getScrollPane() {
		if (desktop.getParent() instanceof JViewport) {
			JViewport viewPort = (JViewport)desktop.getParent();
			if (viewPort.getParent() instanceof JScrollPane)
				return (JScrollPane)viewPort.getParent();
		}
		return null;
	}

	protected void resizeDesktop() {
		int x = 0;
		int y = 0;
		JScrollPane scrollPane = getScrollPane();
		Insets scrollInsets = getScrollPaneInsets();

		if (scrollPane != null) {
			JInternalFrame allFrames[] = desktop.getAllFrames();
			for (int i = 0; i < allFrames.length; i++) {
				if (allFrames[i].getX() + allFrames[i].getWidth() > x) {
					x = allFrames[i].getX() + allFrames[i].getWidth();
				}
				if (allFrames[i].getY() + allFrames[i].getHeight() > y) {
					y = allFrames[i].getY() + allFrames[i].getHeight();
				}
			}
			Dimension d=scrollPane.getVisibleRect().getSize();
			if (scrollPane.getBorder() != null) {
			   d.setSize(d.getWidth() - scrollInsets.left - scrollInsets.right,
						 d.getHeight() - scrollInsets.top - scrollInsets.bottom);
			}

			if (x <= d.getWidth()) {
				x = ((int)d.getWidth()) - 20;
			}
			if (y <= d.getHeight()) {
				y = ((int)d.getHeight()) - 20;
			}
			desktop.setAllSize(x,y);
			scrollPane.invalidate();
			scrollPane.validate();
		}
	}
}