/*******************************************************************************
 * Copyright (c) 2001, 2004 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.viewers.widgets;

import java.text.Collator;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;


import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.jface.viewers.ColumnWeightData;
import org.eclipse.jface.viewers.ICellModifier;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.ITableLabelProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.TableLayout;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.TextCellEditor;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.MouseAdapter;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.TableItem;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.views.properties.IPropertyDescriptor;
import org.eclipse.ui.views.properties.IPropertySource;
import org.w3c.dom.Element;

import org.eclipse.wst.wsdl.ui.internal.WSDLEditorPlugin;
import org.eclipse.wst.xml.core.document.IDOMElement;

public class AttributesTable extends TableViewer implements ICellModifier
{                           
  protected static final String PROPERTY = WSDLEditorPlugin.getWSDLString("_UI_LABEL_PROPERTY"); //$NON-NLS-1$
  protected static final String VALUE = WSDLEditorPlugin.getWSDLString("_UI_LABEL_VALUE"); //$NON-NLS-1$

  protected IEditorPart editorPart;
  protected String[] columnProperties = {PROPERTY, VALUE};
  protected PropertyTableProvider tableProvider = new PropertyTableProvider(this);
  protected CellEditor textCellEditor;
  //protected StringComboBoxCellEditor comboCellEditor;
  protected IPropertySource propertySource;
  

  public AttributesTable(IEditorPart editorPart, Composite parent)
  {
    super(new Table(parent, SWT.FULL_SELECTION | SWT.MULTI | SWT.FLAT));   
  	this.editorPart = editorPart;               
    getTable().setLinesVisible(true);
    getTable().setHeaderVisible(true);  
    
    setContentProvider(tableProvider);
    setLabelProvider(tableProvider);
    setColumnProperties(columnProperties);

    for (int i = 0; i < columnProperties.length; i++)
    {
      TableColumn column = new TableColumn(getTable(), SWT.NONE, i);
      column.setText(columnProperties[i]);
      column.setAlignment(SWT.LEFT);
    }      

    TableLayout layout = new TableLayout(); 
    ColumnWeightData data = new ColumnWeightData(40, 40, true);
    layout.addColumnData(data);
    
    ColumnWeightData data2 = new ColumnWeightData(80, 80, true);
    layout.addColumnData(data2);                       

    getTable().setLayout(layout);
         
    textCellEditor = new TextCellEditor(getTable());                            
 	resetCellEditors();	    

    setCellModifier(this);    
  }  
      
  protected void hookControl(Control control) {
  	// we need to hook up our own mouse listener first
  	// so that we can update the cellEditors before
  	// the 'internal' listener tries to get hold of them
	Table tableControl = (Table)control;
	  tableControl.addMouseListener(new MouseAdapter() {
		  public void mouseDown(MouseEvent e) {
			updateCellEditors();
		  }
	  });	  	  	
	  super.hookControl(control);
  }                                

  // ICellModifier
  public boolean canModify(Object element, String property)
  {
    return property.equals(VALUE);
  }  

  public Object getValue(Object element, String property)
  {
    int column = 0;
    if (property.equals(columnProperties[0]))
    {
      column = 0;
    }
    else if (property.equals(columnProperties[1]))
    {
      column = 1;
    }    
    return tableProvider.getColumnText(element, column);
  }

  public void modify(Object element, String property, Object value)
  {  
  	TableItem item = (TableItem)element;
	IPropertyDescriptor propertyDescriptor = (IPropertyDescriptor)item.getData();
		
	// if the new value is the same as the old value, the user has only clicked
	// on the cell in the course of 'browsing' ... so don't edit the value
	Object oldValue = getValue(propertyDescriptor, property);	
	if (value != null && !value.equals(oldValue)) 
	{	
		// we assume the value is empty that the attribute should be removed
		// todo... we probably need to look at this in more detail
		if (value instanceof String && ((String)value).length() == 0)
		{
			value = null;
		}		  	
		propertySource.setPropertyValue(propertyDescriptor.getId(), value);   
		refresh(item.getData());
	}	  		
  } 
   
   
  protected void updateCellEditors()
  {                
	CellEditor[] cellEditors = new CellEditor[2];
	cellEditors[0] = textCellEditor;
	cellEditors[1] = textCellEditor;

	Element element = (Element)getInput();
      	 
	IPropertyDescriptor[] propertyDescriptors = propertySource.getPropertyDescriptors();
	int index = getTable().getSelectionIndex();
	if (index >= 0 && index < propertyDescriptors.length)
	{
	  CellEditor[] oldCellEditors = getCellEditors();
	  CellEditor oldCellEditor = (oldCellEditors.length > 1) ? oldCellEditors[1] : null;
	  if (oldCellEditor != null && oldCellEditor != textCellEditor)
	  {
	   oldCellEditor.deactivate();
	   oldCellEditor.dispose();
	  }
	  cellEditors[1] = propertyDescriptors[index].createPropertyEditor(getTable());     
	}  
	setCellEditors(cellEditors);     
  }
                 

  public String[] getStringArray(List list)
  {
    String[] result = new String[list.size()];
    for (int i = 0; i < result.length; i++)
    {
      result[i] = (String)list.get(i);
    }
    return result;
  }
                                   
  protected void resetCellEditors()
  {
	CellEditor[] cellEditors = new CellEditor[2];
	cellEditors[0] = textCellEditor;
	cellEditors[1] = textCellEditor;
	setCellEditors(cellEditors);  
  }


  class PropertyTableProvider extends LabelProvider implements ITableLabelProvider, IStructuredContentProvider
  {                  
    protected TableViewer viewer;

    PropertyTableProvider(TableViewer viewer)
    {
      this.viewer = viewer;
    }

    public void inputChanged(Viewer viewer, Object oldInput, Object newInput)  
    {
	  resetCellEditors();		    	
      if (newInput instanceof IDOMElement)
      {      
	      propertySource = new ExtensiblePropertySource(editorPart, (IDOMElement)newInput);
      } 
      else if (newInput instanceof Element)
      {
      	propertySource = new ReadOnlyPropertySource(editorPart, (Element)newInput);
      }
      else
      {
      	propertySource = null;
      }   	
    }

    public Image getColumnImage(Object element, int columnIndex)
    {  
      return null;
    }      

    public String getColumnText(Object o, int columnIndex)  
    { 
	  IPropertyDescriptor propertyDescriptor = (IPropertyDescriptor)o;	
      return (columnIndex == 0) ? propertyDescriptor.getId().toString() : propertySource.getPropertyValue(propertyDescriptor.getId()).toString();
    }  

    public Object[] getElements(Object o)
    {         
   	  Object[] result = propertySource.getPropertyDescriptors();
   	  // For some strange reson the ViewerSorter doesn't seem to be working for this table
   	  // As a workaround we sort them in this method before returning them to the viewer
   	  if (result.length > 0)
   	  {
   	  	Arrays.sort(result, new InternalComparator());
   	  }
   	  return result;
    }
  }
  
  class InternalComparator implements Comparator
  {
	public int compare(Object e1, Object e2) 
	{
		IPropertyDescriptor p1 = (IPropertyDescriptor)e1;
		IPropertyDescriptor p2 = (IPropertyDescriptor)e2;
		String p1Name = p1.getDisplayName();
		String p2Name = p2.getDisplayName();
		return Collator.getInstance().compare(p1.getDisplayName(), p2.getDisplayName());
	}  	
  }
}