/*
 * (c) Copyright 2010-2011 AgileBirds
 *
 * This file is part of OpenFlexo.
 *
 * OpenFlexo is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * OpenFlexo is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with OpenFlexo. If not, see <http://www.gnu.org/licenses/>.
 *
 */
package org.openflexo.components.browser.wkf;

import java.util.Enumeration;

import javax.swing.tree.TreePath;

import org.openflexo.components.browser.BrowserElement;
import org.openflexo.components.browser.BrowserElementType;
import org.openflexo.components.browser.ExpansionSynchronizedElement;
import org.openflexo.components.browser.ProjectBrowser;
import org.openflexo.foundation.DataModification;
import org.openflexo.foundation.FlexoObservable;
import org.openflexo.foundation.wkf.WKFGroup;
import org.openflexo.foundation.wkf.action.OpenLoopedPetriGraph;
import org.openflexo.foundation.wkf.dm.ObjectVisibilityChanged;
import org.openflexo.foundation.wkf.dm.PetriGraphHasBeenClosed;
import org.openflexo.foundation.wkf.dm.PetriGraphHasBeenOpened;
import org.openflexo.foundation.wkf.edge.FlexoPostCondition;
import org.openflexo.foundation.wkf.node.LOOPOperator;
import org.openflexo.foundation.wkf.node.PetriGraphNode;

/**
 * @author gpolet
 * 
 */
public class OperatorLoopElement extends OperatorNodeElement implements ExpansionSynchronizedElement {

	/**
	 * @param object
	 * @param browser
	 */
	public OperatorLoopElement(LOOPOperator object, ProjectBrowser browser, BrowserElement parent) {
		super(object, BrowserElementType.OPERATOR_LOOP_NODE, browser, parent);
	}

	@Override
	public TreePath getTreePath() {
		return super.getTreePath();
	}

	private boolean isObserving = false;

	private void addObserver() {
		if (isObserving) {
			return;
		}
		if (getLOOPOperator().getExecutionPetriGraph() != null) {
			getLOOPOperator().getExecutionPetriGraph().addObserver(this);
			isObserving = true;
		}
	}

	@Override
	public void delete() {
		if (getLOOPOperator().getExecutionPetriGraph() != null) {
			getLOOPOperator().getExecutionPetriGraph().deleteObserver(this);
			isObserving = false;
		}
		super.delete();
	}

	@Override
	protected void buildChildrenVector() {
		if (getLOOPOperator().hasExecutionPetriGraph()) {
			addObserver();
			for (Enumeration<PetriGraphNode> en = getLOOPOperator().getExecutionPetriGraph().getSortedNodes(); en.hasMoreElements();) {
				PetriGraphNode element = en.nextElement();
				if (!element.isGrouped()) {
					addToChilds(element);
				}
			}
			for (WKFGroup group : getLOOPOperator().getExecutionPetriGraph().getGroups()) {
				addToChilds(group);
			}
		}
		super.buildChildrenVector();
	}

	@Override
	public boolean isNameEditable() {
		return true;
	}

	public LOOPOperator getLOOPOperator() {
		return (LOOPOperator) getObject();
	}

	@Override
	public void setName(String name) {
		getLOOPOperator().setName(name);
	}

	@Override
	public void collapse() {
		if (getLOOPOperator().hasExecutionPetriGraph() && isExpanded()) {
			OpenLoopedPetriGraph.actionType.makeNewAction(getLOOPOperator(), null, getProjectBrowser().getEditor()).doAction();
		}
	}

	@Override
	public void expand() {
		if (getLOOPOperator().hasExecutionPetriGraph() && !isExpanded()) {
			OpenLoopedPetriGraph.actionType.makeNewAction(getLOOPOperator(), null, getProjectBrowser().getEditor()).doAction();
		}
	}

	@Override
	public boolean isExpanded() {
		return getLOOPOperator().hasExecutionPetriGraph() && getLOOPOperator().getExecutionPetriGraph().getIsVisible();
	}

	@Override
	public boolean isExpansionSynchronizedWithData() {
		if (_browser.getSelectionManager() != null) {
			return getLOOPOperator().getProcess() == _browser.getSelectionManager().getRootFocusedObject();
		}
		return false;
	}

	@Override
	public boolean requiresExpansionFor(BrowserElement next) {
		if (next instanceof PreConditionElement) {
			return ((PreConditionElement) next).getPreCondition().isContainedIn(getLOOPOperator());
		} else if (next instanceof PostConditionElement) {
			FlexoPostCondition edge = ((PostConditionElement) next).getPostCondition();
			if (edge.getNextNode() != null && edge.getNextNode().isContainedIn(getLOOPOperator()) && edge.getStartNode() != null
					&& edge.getStartNode().isContainedIn(getLOOPOperator())) {
				return true;
			}
			return false;
		} else if (next instanceof PortMapElement) {
			return false;
		} else if (next instanceof MessageElement) {
			return false;
		} else {
			return true;
		}
	}

	@Override
	public void update(FlexoObservable observable, DataModification dataModification) {
		if (_browser != null) {
			if (dataModification instanceof ObjectVisibilityChanged || dataModification instanceof PetriGraphHasBeenClosed
					|| dataModification instanceof PetriGraphHasBeenOpened) {
				_browser.notifyExpansionChanged(this);
			}
		}
		super.update(observable, dataModification);
	}
}