/* 
 * Copyright (c) 2008 Stiftung Deutsches Elektronen-Synchrotron, 
 * Member of the Helmholtz Association, (DESY), HAMBURG, GERMANY.
 *
 * THIS SOFTWARE IS PROVIDED UNDER THIS LICENSE ON AN "../AS IS" BASIS. 
 * WITHOUT WARRANTY OF ANY KIND, EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED 
 * TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE AND 
 * NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE 
 * FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR 
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. SHOULD THE SOFTWARE PROVE DEFECTIVE 
 * IN ANY RESPECT, THE USER ASSUMES THE COST OF ANY NECESSARY SERVICING, REPAIR OR 
 * CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE. 
 * NO USE OF ANY SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER THIS DISCLAIMER.
 * DESY HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, 
 * OR MODIFICATIONS.
 * THE FULL LICENSE SPECIFYING FOR THE SOFTWARE THE REDISTRIBUTION, MODIFICATION, 
 * USAGE AND OTHER RIGHTS AND OBLIGATIONS IS INCLUDED WITH THE DISTRIBUTION OF THIS 
 * PROJECT IN THE FILE LICENSE.HTML. IF THE LICENSE IS NOT INCLUDED YOU MAY FIND A COPY 
 * AT HTTP://WWW.DESY.DE/LEGAL/LICENSE.HTM
 */
package org.csstudio.sds.ui.internal.commands;

import org.csstudio.sds.ui.editparts.AbstractWidgetEditPart;
import org.csstudio.sds.ui.internal.editor.dnd.DropPvRequest;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.gef.commands.Command;
import org.eclipse.ui.progress.UIJob;

/**
 * A command, which changes the settings from a Widget, caused by a Drag and
 * Drop.
 * 
 * @author Sven Wende, Kai Meyer
 */
public final class ChangeSettingsFromDroppedPvCommand extends Command {
	/**
	 * The Abstract EditPart.
	 */
	private AbstractWidgetEditPart _editPart;
	/**
	 * The Request.
	 */
	private DropPvRequest _request;

	/**
	 * The old alias value.
	 */
	private String _oldValue;

	/**
	 * Constructor.
	 * 
	 * @param request
	 *            The Request
	 * @param editPart
	 *            The EditPart for the Widget
	 */
	public ChangeSettingsFromDroppedPvCommand(final DropPvRequest request, final AbstractWidgetEditPart editPart) {
		assert request != null;
		assert editPart != null;
		_request = request;
		_editPart = editPart;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void execute() {
		_oldValue = _editPart.getWidgetModel().getAliases().get("channel");

		if (_request.getDroppedProcessVariables().size() > 0) {
			// FIXME: SW: Umgang, falls mehrere PVs gedroppt wurden
			_editPart.getWidgetModel().setAliasValue("channel", _request.getDroppedProcessVariables().get(0).getFullName());

			// remember the state
			_editPart.getWidgetModel().saveState();

			// connect
			_editPart.getWidgetModel().setLive(true);

			UIJob job = new UIJob("Temporary Connect") {
				@Override
				public IStatus runInUIThread(final IProgressMonitor monitor) {
					_editPart.getWidgetModel().setLive(false);

					// reset widget state
					_editPart.getWidgetModel().restoreState();

					return Status.OK_STATUS;
				}
			};
			job.schedule(3000);
		}
	}

	@Override
	public void undo() {
		_editPart.getWidgetModel().setLive(false);

		if (_oldValue == null) {
			_editPart.getWidgetModel().removeAlias("channel");
		} else {
			_editPart.getWidgetModel().setAliasValue("channel", _oldValue);
		}

		// reset widget state
		_editPart.getWidgetModel().restoreState();

	}
}