/*******************************************************************************
 * Copyright (c) 2008 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.css.ui.internal.handlers;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.IHandler;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.custom.BusyIndicator;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.handlers.HandlerUtil;
import org.eclipse.ui.texteditor.ITextEditor;
import org.eclipse.wst.css.core.internal.cleanup.CleanupProcessorCSS;
import org.eclipse.wst.css.ui.internal.edit.ui.CleanupDialogCSS;
import org.eclipse.wst.sse.core.StructuredModelManager;
import org.eclipse.wst.sse.core.internal.cleanup.IStructuredCleanupProcessor;
import org.eclipse.wst.sse.core.internal.provisional.IStructuredModel;
import org.eclipse.wst.sse.ui.internal.SSEUIMessages;

public class CleanupDocumentHandler extends AbstractHandler implements IHandler {
	private IStructuredCleanupProcessor fCleanupProcessor;

	public void dispose() {
		// nulling out just in case
		fCleanupProcessor = null;
	}
	
	public Object execute(ExecutionEvent event) throws ExecutionException {
		IEditorPart editorPart = HandlerUtil.getActiveEditor(event);
		ITextEditor textEditor = null;
		if (editorPart instanceof ITextEditor)
			textEditor = (ITextEditor) editorPart;
		else {
			Object o = editorPart.getAdapter(ITextEditor.class);
			if (o != null)
				textEditor = (ITextEditor) o;
		}
		
		if (textEditor != null) {
			final ITextEditor editor = textEditor;
			Dialog cleanupDialog = new CleanupDialogCSS(editor.getSite().getShell());
			if (cleanupDialog.open() == Window.OK) {
				// setup runnable
				Runnable runnable = new Runnable() {
					public void run() {
						IStructuredCleanupProcessor cleanupProcessor = getCleanupProcessor();
						if (cleanupProcessor != null) {
							IStructuredModel model = null;
							try {
								model = StructuredModelManager.getModelManager().getExistingModelForEdit(editor.getDocumentProvider().getDocument(editor.getEditorInput()));
								if (model != null)
									cleanupProcessor.cleanupModel(model);
							}
							finally {
								if (model != null)
									model.releaseFromEdit();
							}
						}
					}
				};

				// TODO: make independent of 'model'.
				IStructuredModel model = null;
				try {
					model = StructuredModelManager.getModelManager().getExistingModelForEdit(editor.getDocumentProvider().getDocument(editor.getEditorInput()));
					if (model != null) {
						// begin recording
						ITextSelection selection = (ITextSelection) editor.getSelectionProvider().getSelection();
						model.beginRecording(this, SSEUIMessages.Cleanup_Document_UI_, SSEUIMessages.Cleanup_Document_UI_, selection.getOffset(), selection.getLength()); //$NON-NLS-1$ //$NON-NLS-2$

						// tell the model that we are about to make a big
						// model change
						model.aboutToChangeModel();

						// run
						BusyIndicator.showWhile(editor.getEditorSite().getWorkbenchWindow().getShell().getDisplay(), runnable);
					}
				}
				finally {
					if (model != null) {
						// tell the model that we are done with the big
						// model
						// change
						model.changedModel();

						// end recording
						ITextSelection selection = (ITextSelection) editor.getSelectionProvider().getSelection();
						model.endRecording(this, selection.getOffset(), selection.getLength());
						model.releaseFromEdit();
					}
				}
			}
		}
		return null;
	}

	public void selectionChanged(IAction action, ISelection selection) {
		// do nothing
	}

	IStructuredCleanupProcessor getCleanupProcessor() {
		if (fCleanupProcessor == null)
			fCleanupProcessor = new CleanupProcessorCSS();

		return fCleanupProcessor;
	}
}