// FramesHelper.java
// $Id: FramesHelper.java,v 1.7 2000/08/16 21:37:27 ylafon Exp $
// (c) COPYRIGHT MIT and INRIA, 1997.
// Please first read the full copyright statement in file COPYRIGHT.html

package org.w3c.jigadm.editors ;

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Component;
import java.awt.Container;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Panel;
import java.awt.ScrollPane;
import java.awt.Scrollbar;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import java.util.Properties;
import java.util.StringTokenizer;

import org.w3c.jigadm.PropertyManager;
import org.w3c.jigadm.RemoteResourceWrapper;

import org.w3c.jigsaw.admin.RemoteAccessException;
import org.w3c.jigsaw.admin.RemoteResource;

import org.w3c.jigadm.events.ResourceChangeEvent;

import org.w3c.tools.widgets.BorderPanel;
import org.w3c.tools.widgets.FakeComboBox;
import org.w3c.tools.widgets.TreeBrowser;

import org.w3c.tools.resources.Attribute;

public class FramesHelper extends ResourceHelper {

    static private String FAL_ADD    = "add";
    static private String FAL_DELETE = "delete";
    static private String FAL_EDIT   = "edit";
    static private String FAL_BACK   = "back";

    class FramesActionListener implements ActionListener {

   
	class Performer extends Thread {
	    String action = null;

	    public void run() {
		if (action.equals(FAL_ADD)) {
		    addFrame();
		} else if (action.equals(FAL_DELETE)) {
		    deleteCurrentFrame();
		} else if (action.equals(FAL_BACK)) {
		    initAddPanel(prop);
		}
	    }

	    Performer(String action) {
		this.action = action;
	    }
	}

	public void actionPerformed(ActionEvent ae) {
	    String command = ae.getActionCommand();
	    (new Performer(command)).start();
	}

    }
	
    private FramesActionListener fal;
    RemoteResourceWrapper rrw = null;
    RemoteResourceWrapper root_rrw = null;
    AttributesHelper frameattr = null;
    private boolean initialized = false;
    Properties prop;
    Panel widget;
    Panel addFrame;
    FakeComboBox combo;
    Component centerComp;
    FrameBrowser fb = null;

    protected void addFrame() {
	String selected = combo.getText();
	if(selected != null)
	    if (selected.length() > 0) {
		boolean authorized = false;
		boolean ok = true;
		RemoteResource newFrame = null;
		while (!authorized) {
		    try {
			authorized = true;
			newFrame = rrw.getResource().registerFrame( null, 
								    selected );
		    } catch (RemoteAccessException ex) {
			if( ex.getMessage().equals("Unauthorized")) {
			    authorized = false;
			} else {
			    errorPopup("RemoteAccessException",ex);
			    ok = false;
			}
		    } finally {
			if(!authorized) {
			    rrw.getBrowser().popupDialog("admin");
			}
		    }
		}
		if(ok) {
		    RemoteResourceWrapper nrrw = 
			new RemoteResourceWrapper(rrw, newFrame, 
						  rrw.getBrowser());
		    processEvent(new ResourceChangeEvent(rrw,"added", null, 
							 nrrw));
		    //FIXME useful??
		    widget.validate();
		    widget.setVisible(true);
		}
	    }
    }

    protected void deleteCurrentFrame() {
	if (rrw == root_rrw)
	    return;

	boolean authorized = false;
	boolean ok = true;
	while (!authorized) {
	    try {
		authorized = true;
		rrw.getFatherResource().unregisterFrame(rrw.getResource());
		//	rrw = root_rrw; //FIXME
	    } catch (RemoteAccessException ex) {
		if( ex.getMessage().equals("Unauthorized")) {
		    authorized = false;
		} else {
		    errorPopup("RemoteAccessException",ex);
		    ok = false;
		}
	    } finally {
		if(!authorized) {
		    rrw.getBrowser().popupDialog("admin");
		}
	    }
	}
	if (ok) {
	    initAddPanel(prop);
	    processEvent(new ResourceChangeEvent(rrw.getFatherWrapper(),
						 "deleted", rrw, null));
	    rrw = root_rrw;
	}
    }

    protected void editFrame(RemoteResourceWrapper framew) {
	rrw = framew; //SURE FIXME ??
	boolean authorized;
	frameattr = new AttributesHelper();
	frameattr.addResourceListener(new FramesHelperListener(fb));
	widget.remove(centerComp);
	authorized = false;
	while (!authorized) {
	    try {
		authorized = true;
		frameattr.initialize(framew, null);
	    } catch (RemoteAccessException ex) {
		if( ex.getMessage().equals("Unauthorized")) {
		    authorized = false;
		} else {
		    errorPopup("RemoteAccessException",ex);
		    // do nothing
		}
	    } finally {
		if(!authorized) {
		    rrw.getBrowser().popupDialog("admin");
		}
	    }
	}
	Panel interp = new Panel(new BorderLayout());
	interp.add("Center", frameattr.getComponent());
	centerComp = interp;

	Panel pbutton = new Panel(new GridLayout(1,2,2,2));
	Button back = new Button("Back to Add Frame menu");
	back.setActionCommand(FAL_BACK);
	back.addActionListener(fal);

	pbutton.add(back);

	if (rrw != root_rrw) {
	    Button del = new Button("Delete selected Frame");
	    del.setActionCommand(FAL_DELETE);
	    del.addActionListener(fal);

	    pbutton.add(del);
	}

	interp.add("South", pbutton);
	widget.add("Center", centerComp);
	widget.validate();
	widget.setVisible(true);
    }

    public void removeAll() {
	widget.removeAll();
    }

    public void removeCenterComp() {
	widget.remove(centerComp);
    }

    public Component getComponent() {
	return widget;
    }

    /**
     * Commit changes (if any).
     * @exception RemoteAccessException if a remote access error occurs.
     */
    public void commitChanges()
	throws RemoteAccessException
    {
	if(!initialized)
	    return;
	return;
    }

    public boolean hasChanged() {
	return false;
    }

    public void resetChanges() {
    }

    public void clearChanged() {
    }

    public final String getTitle () {
	return "Frames";
    }

    public FramesHelper() {
	widget = new Panel();
	fal = new FramesActionListener();
    }

    protected void initFrames()
	throws RemoteAccessException
    {
	Panel fbrowser = new Panel(new BorderLayout());

	Scrollbar sv = new Scrollbar(Scrollbar.VERTICAL);
	Scrollbar sh = new Scrollbar(Scrollbar.HORIZONTAL);
	FrameTreeListener ftl = new FrameTreeListener(this);
	fb = new FrameBrowser(ftl, root_rrw);
	fb.setVerticalScrollbar(sv);
	fb.setHorizontalScrollbar(sh);
	fbrowser.add("Center", fb);
	fbrowser.add("East", sv);
	fbrowser.add("South", sh);

	BorderPanel border = new BorderPanel(BorderPanel.LOWERED);
	border.setLayout(new BorderLayout());
	border.add(fbrowser);

	widget.add("South", border);

    }

    protected void initAddPanel(Properties config) {
	if(addFrame == null) {
	    addFrame = new Panel(new BorderLayout());
	    String af = config.getProperty("org.w3c.jigadm.editors.frames");
	    StringTokenizer st = new StringTokenizer(af, "|");
	    ScrollPane fsp = new ScrollPane();
	    GridBagLayout fgbl = new GridBagLayout();
	    GridBagConstraints fgbc = new GridBagConstraints();
	    Panel fspp = new Panel (fgbl);
	    fsp.add(fspp);
	    PropertyManager pm = PropertyManager.getPropertyManager();
	    String downPath = pm.getIconLocation("down");
	    String leftPath = pm.getIconLocation("left");
	    combo = new FakeComboBox(35,7,true,downPath,leftPath);
	    while(st.hasMoreTokens())
		combo.add(st.nextToken().trim());
	    fspp.add(combo);
	    addFrame.add("Center", fsp); //Center
	    // Add listener to switch between frame chooser and configurer
	    Button newb     = new Button("Add Frame");
	    newb.setActionCommand(FAL_ADD);
	    newb.addActionListener(fal);
	    addFrame.add("South", newb);
	} else
	    widget.remove(centerComp);
	widget.add("Center", addFrame);
	centerComp = addFrame;
    }

    /**
     * initialize this helper
     * @param rrw The RemoteResourceWrapper
     * @param pr The properties
     * @exception RemoteAccessException if a remote access error occurs.
     */
    public void initialize(RemoteResourceWrapper rrw, Properties pr)
	throws RemoteAccessException
    {
	if(!initialized)
	    initialized = true;
	else {
	    widget.removeAll();
	}
	
	RemoteResource rr;
	this.prop = pr;
	this.rrw = rrw;
	this.root_rrw = rrw;
	rr = rrw.getResource(); 

	if(rr.isFramed()) {
	    widget.setLayout(new BorderLayout());
	    // Create the Add Frame panel
	    initAddPanel(prop);
	    // add the frames
	    initFrames();
	}
    }
}