/*
 * (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.generator.rm;

import java.util.Date;
import java.util.logging.Level;

import org.apache.cayenne.CayenneRuntimeException;
import org.openflexo.foundation.DataModification;
import org.openflexo.foundation.FlexoObservable;
import org.openflexo.foundation.FlexoObserver;
import org.openflexo.foundation.dm.eo.DMEOModel;
import org.openflexo.foundation.rm.FlexoDMResource;
import org.openflexo.foundation.rm.FlexoProject;
import org.openflexo.foundation.rm.FlexoProjectBuilder;
import org.openflexo.foundation.rm.FlexoRMResource;
import org.openflexo.foundation.rm.FlexoResource;
import org.openflexo.foundation.rm.cg.PListFileResource;
import org.openflexo.generator.cg.CGPListFile;
import org.openflexo.generator.dm.EOModelPListGenerator;

public class EOModelPListFileResource extends PListFileResource<EOModelPListGenerator, CGPListFile> implements
		GenerationAvailableFileResource, FlexoObserver {

	public EOModelPListFileResource(FlexoProjectBuilder builder) {
		super(builder);
		// TODO Auto-generated constructor stub
	}

	public EOModelPListFileResource(FlexoProject aProject) {
		super(aProject);
		// TODO Auto-generated constructor stub
	}

	private boolean isObserverRegistered = false;

	@Override
	protected EOModelPListFile createGeneratedResourceData() {
		return new EOModelPListFile(getFile(), this);
	}

	public DMEOModel getDMEOModel() {
		if (getGenerator() != null) {
			return getGenerator().getModel();
		}
		return null;
	}

	public void registerObserverWhenRequired() {
		if (!isObserverRegistered && getDMEOModel() != null) {
			isObserverRegistered = true;
			getDMEOModel().addObserver(this);
		}
	}

	/**
	 * Overrides update
	 * 
	 * @see org.openflexo.foundation.FlexoObserver#update(org.openflexo.foundation.FlexoObservable,
	 *      org.openflexo.foundation.DataModification)
	 */
	@Override
	public void update(FlexoObservable observable, DataModification dataModification) {
		if (observable == getDMEOModel()) {

		}
	}

	@Override
	public EOModelPListFile getGeneratedResourceData() {
		return (EOModelPListFile) super.getGeneratedResourceData();
	}

	/**
	 * Return dependancy computing between this resource, and an other resource, asserting that this resource is contained in this
	 * resource's dependant resources
	 * 
	 * @param resource
	 * @param dependancyScheme
	 * @return
	 */
	@Override
	public boolean optimisticallyDependsOf(FlexoResource resource, Date requestDate) {
		if (resource instanceof FlexoRMResource) {
			return false;
		}
		if (resource instanceof FlexoDMResource) {
			FlexoDMResource dmRes = (FlexoDMResource) resource;
			if (dmRes.isLoaded() && getDMEOModel() != null) {
				try {
					if (getGenerator() != null && getGenerator().pListCache != null
							&& getGenerator().pListCache.equals(getGenerator().generatePList())) {
						return false;
					}
				} catch (CayenneRuntimeException e) {
					return true;
				} catch (NullPointerException e) {
					return true;
				}
				if (getDMEOModel().getLastUpdate().before(requestDate) || getDMEOModel().getLastUpdate().equals(requestDate)) {
					if (logger.isLoggable(Level.FINER)) {
						logger.finer("OPTIMIST DEPENDANCY CHECKING for PLIST EOMODEL " + getDMEOModel().getName());
					}
					return false;
				}
			}
		}
		return super.optimisticallyDependsOf(resource, requestDate);
	}

	/**
	 * Rebuild resource dependancies for this resource
	 */
	@Override
	public void rebuildDependancies() {
		super.rebuildDependancies();

		if (getDMEOModel() != null) {
			addToDependentResources(getProject().getFlexoDMResource());
		}
	}

	static String getDefaultFileName() {
		return "index.eomodeld";
	}

}