/*

* Copyright (c) 2005 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

package com.nokia.sdt.emf.dm.impl;

import com.nokia.sdt.datamodel.adapter.IComponentInstance;

import com.nokia.sdt.datamodel.util.ModelUtils;

import com.nokia.sdt.emf.dm.INode;

import com.nokia.cpp.internal.api.utils.core.Check;

import org.eclipse.emf.common.command.AbstractCommand;

import org.eclipse.emf.common.command.Command;

import org.eclipse.emf.ecore.EObject;

import org.eclipse.emf.edit.EMFEditPlugin;

import org.eclipse.emf.edit.domain.EditingDomain;

import java.util.*;

/**

 * This command gives the instances given it to the EditingDomain's clipbaord.

 * This assumes that the EditingDomain will make copies as needed.

 */

public class SetInstancesToClipboardCommand extends AbstractCommand implements Command {

	protected static final String LABEL = 

		EMFEditPlugin.INSTANCE.getString("_UI_CopyToClipboardCommand_label");

	protected static final String DESCRIPTION = 

		EMFEditPlugin.INSTANCE.getString("_UI_CopyToClipboardCommand_description");

	private EditingDomain editingDomain;

	private List<String> newObjects;

	private NodesCopier oldObjects;

	private INode rootContainer;

	public SetInstancesToClipboardCommand(EditingDomain editingDomain, List objectsToCopy) {

		super(LABEL, DESCRIPTION);

		this.editingDomain = editingDomain;

		this.newObjects = getNamesListFromNodesCollection(objectsToCopy);

		this.oldObjects = new NodesCopier(Collections.EMPTY_LIST);

		Check.checkContract(!objectsToCopy.isEmpty());

		rootContainer = ((INode) objectsToCopy.get(0)).getRootContainer();

	}

	private static List<String> getNamesListFromNodesCollection(Collection<INode> nodes) {

		List<String> names = new ArrayList();

		if (nodes != null) {

			for (Iterator<INode> iter = nodes.iterator(); iter.hasNext();) {

				String name = iter.next().getName();

				Check.checkContract(name != null);

				names.add(name);

			}

		}

		return names;

	}

	private static List<INode> createNodesListFromNamesList(INode root, List<String> names) {

		List<INode> nodes = new ArrayList();

		for (Iterator<String> iter = names.iterator(); iter.hasNext();) {

			String name = iter.next();

			INode node = root.findByNameProperty(name);

			Check.checkState(node != null); // we should be able to get all our nodes back from the names

			nodes.add(node);

		}

		return nodes;

	}

	/* (non-Javadoc)

	 * @see org.eclipse.emf.common.command.AbstractCommand#prepare()

	 */

	protected boolean prepare() {

		return true;

	}

	/* (non-Javadoc)

	 * @see org.eclipse.emf.common.command.Command#execute()

	 */

	public void execute() {

		Collection clipboard = editingDomain.getClipboard();

		if ((clipboard != null) && !clipboard.isEmpty())

			oldObjects = new NodesCopier(new ArrayList(clipboard));

		List<INode> nodes = createNodesListFromNamesList(rootContainer, newObjects);

		Collections.sort(nodes, new Comparator<EObject>() {

			public int compare(EObject o1, EObject o2) {

				return getIndex(o1) - getIndex(o2);

			}

		});

		editingDomain.setClipboard((Collection) nodes);

	}

	private int getIndex(EObject object) {

		IComponentInstance instance = ModelUtils.getComponentInstance(object);

		EObject parent = instance.getParent();

		IComponentInstance parentInstance = ModelUtils.getComponentInstance(parent);

		EObject[] children = parentInstance.getChildren();

		for (int i = 0; i < children.length; i++) {

			if (children[i].equals(object))

				return i;

		}

		Check.checkState(false); // something's terribly wrong if the parent isn't the parent!

		return -1;

	}

	/* (non-Javadoc)

	 * @see org.eclipse.emf.common.command.AbstractCommand#undo()

	 */

	public void undo() {

		editingDomain.setClipboard((Collection) oldObjects.getCopies());

	}

	/* (non-Javadoc)

	 * @see org.eclipse.emf.common.command.Command#redo()

	 */

	public void redo() {

		execute();

	}

}