/**
 * Copyright (c) 2006 IBM Corporation and others.
 * All rights reserved.   This program and the accompanying materials
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *   IBM - Initial API and implementation
 */
package org.eclipse.wst.common.ui.internal.dialogs;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.dialogs.ListDialog;
import org.eclipse.wst.common.ui.internal.Messages;
/**
 * A generic save files dialog. The bulk of the code for this dialog was taken
 * from the JDT refactoring support in
 * org.eclipse.jdt.internal.ui.refactoring.RefactoringSaveHelper. This class is
 * a good candidate for reuse amoung components.
 */
public class SaveDirtyFilesDialog extends ListDialog
{
  public static boolean saveDirtyFiles()
  {
    boolean result = true;
    // TODO (cs) add support for save automatically
    Shell shell = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell();
    IEditorPart[] dirtyEditors = getDirtyEditors();
    if (dirtyEditors.length > 0)
    {  
      result = false;
      SaveDirtyFilesDialog saveDirtyFilesDialog = new SaveDirtyFilesDialog(shell);
      saveDirtyFilesDialog.setInput(Arrays.asList(dirtyEditors));
      // Save all open editors.
      if (saveDirtyFilesDialog.open() == Window.OK)
      {
        result = true;        
        int numDirtyEditors = dirtyEditors.length;
        for (int i = 0; i < numDirtyEditors; i++)
        {
          dirtyEditors[i].doSave(null);
        }
      }     
    }
    return result;    
  }

  private static IEditorPart[] getDirtyEditors()
  {
    List result = new ArrayList(0);
    IWorkbench workbench = PlatformUI.getWorkbench();
    IWorkbenchWindow[] windows = workbench.getWorkbenchWindows();
    for (int i = 0; i < windows.length; i++)
    {
      IWorkbenchPage[] pages = windows[i].getPages();
      for (int x = 0; x < pages.length; x++)
      {
        IEditorPart[] editors = pages[x].getDirtyEditors();
        for (int z = 0; z < editors.length; z++)
        {
          IEditorPart ep = editors[z];
          result.add(ep);
        }
      }
    }
    return (IEditorPart[]) result.toArray(new IEditorPart[result.size()]);
  }

  public SaveDirtyFilesDialog(Shell parent)
  {
    super(parent);
    setTitle(Messages.SaveFilesDialog_save_all_resources);
    setAddCancelButton(true);
    setLabelProvider(createDialogLabelProvider());
    setMessage(Messages.SaveFilesDialog_must_save);
    setContentProvider(new ListContentProvider());
  }

  protected Control createDialogArea(Composite container)
  {
    Composite result = (Composite) super.createDialogArea(container);
    // TODO... provide preference that supports 'always save'
    return result;
  }

  
  private ILabelProvider createDialogLabelProvider()
  {
    return new LabelProvider()
    {
      public Image getImage(Object element)
      {
        return ((IEditorPart) element).getTitleImage();
      }

      public String getText(Object element)
      {
        return ((IEditorPart) element).getTitle();
      }
    };
  }
  
  /** 
   * A specialized content provider to show a list of editor parts.
   * This class has been copied from org.eclipse.jdt.internal.ui.viewsupport.ListContentProvider
   * This class should be removed once a generic solution is made available.
   */   
  private static class ListContentProvider implements IStructuredContentProvider
  {
    List fContents;

    public ListContentProvider()
    {
    }

    public Object[] getElements(Object input)
    {
      if (fContents != null && fContents == input)
        return fContents.toArray();
      return new Object[0];
    }

    public void inputChanged(Viewer viewer, Object oldInput, Object newInput)
    {
      if (newInput instanceof List)
        fContents = (List) newInput;
      else
        fContents = null;
      // we use a fixed set.
    }

    public void dispose()
    {
    }

    public boolean isDeleted(Object o)
    {
      return fContents != null && !fContents.contains(o);
    }
  }
}