/*******************************************************************************
 * Copyright (c) 2001, 2009 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.wst.wsdl.ui.internal.asd.properties.sections;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.eclipse.core.runtime.Assert;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.commands.CommandStack;
import org.eclipse.jface.action.IStatusLineManager;
import org.eclipse.jface.action.SubContributionManager;
import org.eclipse.jface.action.SubStatusLineManager;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IEditorSite;
import org.eclipse.ui.IFileEditorInput;
import org.eclipse.ui.ISharedImages;
import org.eclipse.ui.IViewSite;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.ide.FileStoreEditorInput;
import org.eclipse.ui.part.EditorActionBarContributor;
import org.eclipse.ui.views.properties.tabbed.AbstractPropertySection;
import org.eclipse.ui.views.properties.tabbed.ISection;
import org.eclipse.ui.views.properties.tabbed.TabbedPropertySheetPage;
import org.eclipse.ui.views.properties.tabbed.TabbedPropertySheetWidgetFactory;
import org.eclipse.wst.wsdl.ui.internal.WSDLEditorPlugin;
import org.eclipse.wst.wsdl.ui.internal.asd.design.DesignViewGraphicsConstants;
import org.eclipse.wst.wsdl.ui.internal.asd.facade.IASDObject;
import org.eclipse.wst.wsdl.ui.internal.asd.facade.IASDObjectListener;

public class ASDAbstractSection extends AbstractPropertySection implements ISection, IASDObjectListener, Listener, SelectionListener
{
	private TabbedPropertySheetWidgetFactory factory;
	private Object elementModel;
	protected boolean isReadOnly = false;
	protected Composite composite;
	protected int rightMarginSpace;
	protected int tableMinimumWidth = 50;
	protected CustomListener customListener = new CustomListener();
	private IStatusLineManager statusLine;
	
	protected List listeners = new ArrayList();

	public static final Image ICON_ERROR = WSDLEditorPlugin.getInstance().getWorkbench().getSharedImages().getImage(ISharedImages.IMG_OBJS_ERROR_TSK);
	
	public void createControls(Composite parent, TabbedPropertySheetPage tabbedPropertySheetPage)
	{
		createControls(parent, tabbedPropertySheetPage.getWidgetFactory());
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.wst.common.ui.properties.internal.provisional.ISection#createControls(org.eclipse.swt.widgets.Composite, org.eclipse.wst.common.ui.properties.internal.provisional.TabbedPropertySheetWidgetFactory)
	 */
	public void createControls(Composite parent, TabbedPropertySheetWidgetFactory aFactory)
	{
		this.factory = aFactory;
		GC gc = new GC(parent);
		Point extent = gc.textExtent("  ...  "); //$NON-NLS-1$
		rightMarginSpace = extent.x;
		gc.dispose();
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.wst.common.ui.properties.internal.provisional.ISection#setInput(org.eclipse.ui.IWorkbenchPart, org.eclipse.jface.viewers.ISelection)
	 */
	public void setInput(IWorkbenchPart part, ISelection selection)
	{
	  super.setInput(part, selection);
	  Assert.isTrue(selection instanceof IStructuredSelection);
	  Object input = ((IStructuredSelection)selection).getFirstElement();
	  elementModel = input;
	  attachListener(elementModel);

	  if (input instanceof IASDObject) {
	    isReadOnly = ((IASDObject) input).isReadOnly();
	  }

	  IEditorPart owningEditor = null;
	  if (part!=null) {
	    if (part instanceof IEditorPart) {
	      owningEditor = (IEditorPart)part;
	    } else {
	      IWorkbench workbench = PlatformUI.getWorkbench();
	      if (workbench != null) {
	        IWorkbenchWindow window = workbench.getActiveWorkbenchWindow();
	        if (window != null) {
	          IWorkbenchPage page = window.getActivePage();
	          if (page != null) {
	            owningEditor = page.getActiveEditor();
	          }
	        }
	      }
	    }
	  }
	  if (owningEditor != null) {
	    IEditorInput editorInput = owningEditor.getEditorInput();
	    if (!(editorInput instanceof IFileEditorInput || editorInput instanceof FileStoreEditorInput)) {
	      isReadOnly = true;
	    }
	  }
	  refresh();
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.wst.common.ui.properties.internal.provisional.ISection#aboutToBeShown()
	 */
	public void aboutToBeShown()
	{
		refresh();
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.wst.common.ui.properties.internal.provisional.ISection#aboutToBeHidden()
	 */
	public void aboutToBeHidden()
	{
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.wst.common.ui.properties.internal.provisional.ISection#dispose()
	 */
	public void dispose()
	{
		unattachAllListeners();
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.wst.common.ui.properties.internal.provisional.ISection#getMinimumHeight()
	 */
	public int getMinimumHeight()
	{
		return SWT.DEFAULT;
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.wst.common.ui.properties.internal.provisional.ISection#shouldUseExtraSpace()
	 */
	public boolean shouldUseExtraSpace()
	{
		return true;
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.wst.common.ui.properties.internal.provisional.ISection#refresh()
	 */
	public void refresh()
	{
		if (!composite.isDisposed())
		{
			if (isReadOnly)
			{
				composite.setEnabled(false);
			}
			else
			{
				composite.setEnabled(true);
			}
		}
	}
	
	/**
	 * Get the widget factory.
	 * @return the widget factory.
	 */
	public TabbedPropertySheetWidgetFactory getWidgetFactory() {
		return factory;
	}
	
	public void propertyChanged(Object object, String property)
	{
		refresh();
	}
	
	
	public void doWidgetDefaultSelected(SelectionEvent e)
	{}
	
	public void doWidgetSelected(SelectionEvent e)
	{}
	
	/**
	 * @see org.eclipse.swt.events.SelectionListener#widgetDefaultSelected(SelectionEvent)
	 */
	public void widgetDefaultSelected(SelectionEvent e)
	{
		if (isListenerEnabled() && !isInDoHandle) 
		{
			isInDoHandle = true;
			doWidgetDefaultSelected(e);
			isInDoHandle = false;
		}
		
	}
	
	/**
	 * @see org.eclipse.swt.events.SelectionListener#widgetSelected(SelectionEvent)
	 */
	public void widgetSelected(SelectionEvent e)
	{
		if (isListenerEnabled() && !isInDoHandle) 
		{
			isInDoHandle = true;
			doWidgetSelected(e);
			isInDoHandle = false;
		}
		
	}
	
	boolean listenerEnabled = true;
	/**
	 * Get the value of listenerEnabled.
	 * @return value of listenerEnabled.
	 */
	public boolean isListenerEnabled() 
	{
		return listenerEnabled;
	}
	
    public void applyTextListeners(Control control)
    {
      control.addListener(SWT.FocusOut, customListener);
      control.addListener(SWT.KeyDown, customListener);
    }
    
    public void removeListeners(Control control)
    {
      control.removeListener(SWT.FocusOut, customListener);
      control.removeListener(SWT.KeyDown, customListener);
    }
	
	/**
	 * Set the value of listenerEnabled.
	 * @param v  Value to assign to listenerEnabled.
	 */
	public void setListenerEnabled(boolean  v) 
	{
		this.listenerEnabled = v;
	}
	
	public void handleEvent(Event event)
	{
		if (isListenerEnabled() && !isInDoHandle) 
		{
			isInDoHandle = true;
//			startDelayedEvent(event);
			doHandleEvent(event);
			isInDoHandle = false;
		} // end of if ()
	}
	
	public void doHandleEvent(Event event)
	{
		
	}
	
	protected DelayedEvent delayedTask;
	
	protected void startDelayedEvent(Event e)
	{
		if (delayedTask == null ||
				delayedTask.getEvent() == null)
		{
			delayedTask = new DelayedEvent();
			delayedTask.setEvent(e);
			Display.getDefault().timerExec(500,delayedTask);
		}
		else
		{
			Event delayedEvent = delayedTask.getEvent();
			
			if (e.widget == delayedEvent.widget &&
					e.type == delayedEvent.type)
			{
				// same event, just different data, delay new event
				delayedTask.setEvent(null);
			}
			delayedTask = new DelayedEvent();
			delayedTask.setEvent(e);
			Display.getDefault().timerExec(500,delayedTask);
		}
	}
	
	class DelayedEvent implements Runnable
	{
		protected Event event;
		
		/*
		 * @see Runnable#run()
		 */
		public void run()
		{
			if (event != null)
			{
				isInDoHandle = true;
				doHandleEvent(event);
				isInDoHandle = false;
				event = null;
			}
		}
		
		/**
		 * Gets the event.
		 * @return Returns a Event
		 */
		public Event getEvent()
		{
			return event;
		}
		
		/**
		 * Sets the event.
		 * @param event The event to set
		 */
		public void setEvent(Event event)
		{
			this.event = event;
		}
		
	}
	   
    class CustomListener implements Listener
    {
      boolean isHandlingEvent = false;
      public void handleEvent(Event event)
      {
        if (isListenerEnabled() && !isReadOnly) 
        {
          switch (event.type)
          {
            case SWT.KeyDown :
            {
              if (event.character == SWT.CR)
              {
                if (!isHandlingEvent)
                {
                  isHandlingEvent = true;
                  doHandleEvent(event);
                  isHandlingEvent = false;
                }
              }
              break;
            }
            case SWT.FocusOut :
            {
              if (!isHandlingEvent)
              {
                isHandlingEvent = true;
                doHandleEvent(event);
                isHandlingEvent = false;
              }
              break;
            }
          }
        }
      }
    }
	
	protected boolean isInDoHandle;
	/**
	 * Get the value of isInDoHandle.
	 * @return value of isInDoHandle.
	 */
	public boolean isInDoHandle() 
	{
		return isInDoHandle;
	}
	
	static protected IStatusLineManager getStatusLineManager(IEditorPart editorPart)
	{ 
		IStatusLineManager result = null;
		try
		{                       
			EditorActionBarContributor contributor = (EditorActionBarContributor)editorPart.getEditorSite().getActionBarContributor();
			result = contributor.getActionBars().getStatusLineManager();
		}
		catch (Exception e)
		{
		}  
		return result;
	}
	
	public Object getModel() {
		return elementModel;
	}
	
	protected void attachListener(Object object) {
		if (object instanceof IASDObject && !listeners.contains(object)) {
			((IASDObject) object).registerListener(this);
			listeners.add(object);
		}
	}
	
	protected void unattachAllListeners() {
		Iterator it = listeners.iterator();
		while (it.hasNext()) {
			Object item = it.next();
			((IASDObject) item).unregisterListener(this);
		}
	}
	
	protected void setControlForegroundColor(Control control) {
		if (control != null) {
			if (isReadOnly) {
				control.setForeground(DesignViewGraphicsConstants.readOnlyLabelColor);
			}
			else {
				control.setForeground(DesignViewGraphicsConstants.defaultForegroundColor);
			}
		}
	}
    
    protected void executeCommand(Command command) {
        IWorkbenchPage page = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
        
        if (page.getActiveEditor() != null && page.getActiveEditor().getAdapter(CommandStack.class) != null) {
            CommandStack stack = (CommandStack) page.getActiveEditor().getAdapter(CommandStack.class);
            stack.execute(command);
        }
        else {
            command.execute();
        }
    }

    /**
     * Display an error message in the status line.
     * Call setErrorMessage(null) to clear the status line.
     * @param text 
     */
    public void setErrorMessage(String text)
    {
      IStatusLineManager statusLine = getStatusLineManager();

      if (statusLine!=null)
      {
        if (text==null || text.length()<1)
          statusLine.setErrorMessage(null);
        else
          statusLine.setErrorMessage(ICON_ERROR, text);

        // ensure our message gets displayed
        if (statusLine instanceof SubContributionManager)
          ((SubContributionManager)statusLine).setVisible(true);
        
        statusLine.update(true);
      }
    }
    
    /**
     * Intended to display error messages.
     * @return
     */
    private IStatusLineManager getStatusLineManager()
    {
      if (statusLine==null && getPart()!=null)
      {
        if(getPart().getSite() instanceof IEditorSite)
          statusLine = ((IEditorSite)getPart().getSite()).getActionBars().getStatusLineManager();
        else if (getPart().getSite() instanceof IViewSite)
          statusLine = ((IViewSite)getPart().getSite()).getActionBars().getStatusLineManager();
        
        /* 
         * We must manually set the visibility of the status line since the action bars are from the editor
         * which means the status line only shows up when the editor is in focus (by default).
         * Note only a SubStatusLineManager can set the visibility.
         */
        if (statusLine instanceof SubStatusLineManager)
          ((SubStatusLineManager)statusLine).setVisible(true);
      }
      
      return statusLine;
    }
}