/*******************************************************************************
 * Copyright 2005-2006, CHISEL Group, University of Victoria, Victoria, BC,
 * Canada. 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: The Chisel Group, University of Victoria
 ******************************************************************************/
package org.eclipse.zest.core.viewers.internal;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.zest.core.viewers.IGraphEntityRelationshipContentProvider;
import org.eclipse.zest.core.widgets.Graph;
import org.eclipse.zest.core.widgets.GraphContainer;
import org.eclipse.zest.core.widgets.GraphNode;

/*
 * A factory for the IGraphEntityRelationshipContentProvider.
 * 
 * @author Del Myers
 */
// @tag bug.154580-Content.fix
// @tag bug.160367-Refreshing.fix : updated to use new
// AbstractStylingModelFactory
public class GraphModelEntityRelationshipFactory extends AbstractStylingModelFactory {

	public GraphModelEntityRelationshipFactory(AbstractStructuredGraphViewer viewer) {
		super(viewer);
		if (!(viewer.getContentProvider() instanceof IGraphEntityRelationshipContentProvider)) {
			throw new IllegalArgumentException("Expected IGraphEntityRelationshipContentProvider");
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.zest.core.internal.graphmodel.AbstractStylingModelFactory#createGraphModel()
	 */
	public Graph createGraphModel(Graph model) {
		doBuildGraph(model);
		return model;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.zest.core.internal.graphmodel.AbstractStylingModelFactory#doBuildGraph(org.eclipse.zest.core.internal.graphmodel.GraphModel)
	 */
	protected void doBuildGraph(Graph model) {
		super.doBuildGraph(model);
		Object[] nodes = getContentProvider().getElements(getViewer().getInput());
		nodes = filter(getViewer().getInput(), nodes);
		createModelNodes(model, nodes);
		createModelRelationships(model);
	}

	/**
	 * Creates all the model relationships. Assumes that all of the model nodes
	 * have been created in the graph model already. Runtime O(n^2) + O(r).
	 * 
	 * @param model
	 *            the model to create the relationship on.
	 */
	private void createModelRelationships(Graph model) {
		GraphNode[] modelNodes = getNodesArray(model);
		List listOfNodes = new ArrayList();
		for (int i = 0; i < modelNodes.length; i++) {
			listOfNodes.add(modelNodes[i]);
		}

		for (int i = 0; i < listOfNodes.size(); i++) {
			GraphNode node = (GraphNode) listOfNodes.get(i);
			if (node instanceof GraphContainer) {
				List childNodes = ((GraphContainer) node).getNodes();
				listOfNodes.addAll(childNodes);
			}
		}
		modelNodes = (GraphNode[]) listOfNodes.toArray(new GraphNode[listOfNodes.size()]);

		IGraphEntityRelationshipContentProvider content = getCastedContent();
		for (int i = 0; i < modelNodes.length; i++) {
			for (int j = 0; j < modelNodes.length; j++) {
				Object[] rels = content.getRelationships(modelNodes[i].getData(), modelNodes[j].getData());
				if (rels != null) {
					rels = filter(getViewer().getInput(), rels);
					for (int r = 0; r < rels.length; r++) {
						createConnection(model, rels[r], modelNodes[i].getData(), modelNodes[j].getData());
					}
				}
			}
		}
	}

	/**
	 * Creates the model nodes for the given external nodes.
	 * 
	 * @param model
	 *            the graph model.
	 * @param nodes
	 *            the external nodes.
	 */
	private void createModelNodes(Graph model, Object[] nodes) {
		for (int i = 0; i < nodes.length; i++) {
			createNode(model, nodes[i]);
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.zest.core.internal.graphmodel.IStylingGraphModelFactory#refresh(org.eclipse.zest.core.internal.graphmodel.GraphModel,
	 *      java.lang.Object)
	 */
	public void refresh(Graph graph, Object element) {
		refresh(graph, element, false);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.zest.core.internal.graphmodel.IStylingGraphModelFactory#refresh(org.eclipse.zest.core.internal.graphmodel.GraphModel,
	 *      java.lang.Object, boolean)
	 */
	public void refresh(Graph graph, Object element, boolean updateLabels) {
		// with this kind of graph, it is just as easy and cost-effective to
		// rebuild the whole thing.
		refreshGraph(graph);
	}

	private IGraphEntityRelationshipContentProvider getCastedContent() {
		return (IGraphEntityRelationshipContentProvider) getContentProvider();
	}

}