/*******************************************************************************
 * Copyright (c) 2001, 2006 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.xsd.ui.internal.adt.design.directedit;

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

import org.eclipse.draw2d.Label;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.gef.GraphicalEditPart;
import org.eclipse.gef.tools.CellEditorLocator;
import org.eclipse.gef.tools.DirectEditManager;
import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.jface.viewers.ComboBoxCellEditor;
import org.eclipse.jface.viewers.ICellEditorListener;
import org.eclipse.swt.custom.CCombo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;

public abstract class ComboBoxCellEditorManager extends DirectEditManager// implements
                                                                          // DirectEditPolicyDelegate
{
  protected Label label;

  public ComboBoxCellEditorManager(GraphicalEditPart source, Label label)
  {
    super(source, ComboBoxCellEditor.class, new InternalCellEditorLocator(label));
    this.label = label;
  }

  protected void initCellEditor()
  {
    String initialLabelText = label.getText();

    CCombo combo = (CCombo) getCellEditor().getControl();
    combo.setFont(label.getFont());
    combo.setForeground(label.getForegroundColor());
    combo.setBackground(label.getBackgroundColor());
    combo.setVisibleItemCount(20);

    /*
     * combo.addKeyListener(new KeyAdapter() { // hook key pressed - see PR
     * 14201 public void keyPressed(KeyEvent keyEvent) { if (keyEvent.character ==
     * 'z') { getCellEditor().applyEditorValue(); } } });
     */
    ICellEditorListener cellEditorListener = new ICellEditorListener()
    {
      public void cancelEditor()
      {
      }

      public void applyEditorValue()
      {
      }

      public void editorValueChanged(boolean old, boolean newState)
      {
      }
    };
    getCellEditor().addListener(cellEditorListener);

    String[] item = combo.getItems();
    for (int i = 0; i < item.length; i++)
    {
      if (item[i].equals(initialLabelText))
      {
        getCellEditor().setValue(new Integer(i));
        break;
      }
    }
  }

  // hack... for some reason the ComboBoxCellEditor does't fire an
  // editorValueChanged to set the dirty flag
  // unless we overide this method to return true, the manager is not notified
  // of changes made in the cell editor
  protected boolean isDirty()
  {
    return true;
  }

  protected CellEditor createCellEditorOn(Composite composite)
  {
    boolean isLabelTextInList = false;
    List list = computeComboContent();
    for (Iterator i = list.iterator(); i.hasNext();)
    {
      String string = (String) i.next();
      if (string.equals(label.getText()))
      {
        isLabelTextInList = true;
        break;
      }
    }

    if (!isLabelTextInList)
    {
      list.add(label.getText());
    }

    List sortedList = computeSortedList(list);
    String[] stringArray = new String[sortedList.size()];
    for (int i = 0; i < stringArray.length; i++)
    {
      stringArray[i] = (String) sortedList.get(i);
    }
    return createCellEditor(composite, stringArray);
  }
  
  protected CellEditor createCellEditor(Composite composite, String[] stringArray)
  {
    return new ComboBoxCellEditor(composite, stringArray);    
  }

  protected List computeSortedList(List list)
  {
    return list;
  }

  protected abstract List computeComboContent();

  protected abstract void performModify(Object value);

  public static class InternalCellEditorLocator implements CellEditorLocator
  {
    protected Label label;

    public InternalCellEditorLocator(Label label)
    {
      this.label = label;
    }

    public void relocate(CellEditor celleditor)
    {
      CCombo combo = (CCombo) celleditor.getControl();

      // TODO: We're pulling a fast one here..... This is assuming we're using a
      // CCombo as our widget
      // Our eventual 'Combo' may not even use CCombo so this will most likely
      // get replaced.
      // int dropDownButtonSizeX = 16;

      Rectangle labelParentBounds = label.getBounds().getCopy();
      label.translateToAbsolute(labelParentBounds);

      int x = labelParentBounds.x;
      int y = labelParentBounds.y;
      int widthK = labelParentBounds.width;
      int height = labelParentBounds.height;
      combo.setBounds(x, y + 1, widthK, height - 2);
    }
  }

  // implements DirectEditPolicyDelegate
  // 
  public void performEdit(CellEditor cellEditor)
  {
    ADTComboBoxCellEditor comboCellEditor = (ADTComboBoxCellEditor) cellEditor;
    CCombo combo = (CCombo) getCellEditor().getControl();
    int index = combo.getSelectionIndex();
    if (index != -1)
    {
      Object value = combo.getItem(index);
      if (comboCellEditor.getSelectedValue() != null)
      {
        value = comboCellEditor.getSelectedValue();
      }

      performModify(value);
    }
    else
    {
      String typedValue = combo.getText();
      if (combo.indexOf(typedValue) != -1)
      {
        performModify(typedValue);
      }
      else
      {
        String closeMatch = getCloseMatch(typedValue, combo.getItems());
        if (closeMatch != null)
        {
          performModify(closeMatch);
        }
        else
        {
          Display.getCurrent().beep();
        }
      }
    }
  }

  protected String getCloseMatch(String value, String[] items)
  {
    int matchIndex = -1;

    for (int i = 0; i < items.length; i++)
    {
      String item = items[i];
      String a = getLocalName(value);
      String b = getLocalName(item);
      if (a.equalsIgnoreCase(b))
      {
        matchIndex = i;
        break;
      }
    }
    return matchIndex != -1 ? items[matchIndex] : null;
  }

  protected String getLocalName(String string)
  {
    int index = string.indexOf(":"); //$NON-NLS-1$
    return (index != -1) ? string.substring(index + 1) : string;
  }
}