/*******************************************************************************
 * This file is part of OpenNMS(R).
 *
 * Copyright (C) 2012-2014 The OpenNMS Group, Inc.
 * OpenNMS(R) is Copyright (C) 1999-2014 The OpenNMS Group, Inc.
 *
 * OpenNMS(R) is a registered trademark of The OpenNMS Group, Inc.
 *
 * OpenNMS(R) is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published
 * by the Free Software Foundation, either version 3 of the License,
 * or (at your option) any later version.
 *
 * OpenNMS(R) 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with OpenNMS(R).  If not, see:
 *      http://www.gnu.org/licenses/
 *
 * For more information contact:
 *     OpenNMS(R) Licensing <license@opennms.org>
 *     http://www.opennms.org/
 *     http://www.opennms.com/
 *******************************************************************************/

package org.opennms.features.topology.app.internal.jung;

import java.util.Collection;

import org.opennms.features.topology.api.Graph;
import org.opennms.features.topology.api.GraphContainer;
import org.opennms.features.topology.api.Layout;
import org.opennms.features.topology.api.topo.Edge;
import org.opennms.features.topology.api.topo.EdgeRef;
import org.opennms.features.topology.api.topo.Vertex;
import org.opennms.features.topology.api.topo.VertexRef;

import edu.uci.ics.jung.algorithms.layout.SpringLayout;
import edu.uci.ics.jung.graph.SparseGraph;

public class SpringLayoutAlgorithm extends AbstractLayoutAlgorithm {

	@Override
	public void updateLayout(final GraphContainer graphContainer) {

		Graph g = graphContainer.getGraph();

		final Layout graphLayout = g.getLayout();

		SparseGraph<VertexRef, EdgeRef> jungGraph = new SparseGraph<VertexRef, EdgeRef>();

		Collection<? extends Vertex> vertices = g.getDisplayVertices();

		for(VertexRef v : vertices) {
			jungGraph.addVertex(v);
		}

		Collection<? extends Edge> edges = g.getDisplayEdges();

		for(Edge e : edges) {
			jungGraph.addEdge(e, e.getSource().getVertex(), e.getTarget().getVertex());
		}

		SpringLayout<VertexRef, EdgeRef> layout = new SpringLayout<VertexRef, EdgeRef>(jungGraph);
		layout.setForceMultiplier(SPRING_FORCE_MULTIPLIER);
		layout.setRepulsionRange(SPRING_LAYOUT_REPULSION);
		layout.setInitializer(initializer(graphLayout));
		layout.setSize(selectLayoutSize(graphContainer));

		int count = 0;
		while(!layout.done() && count < 700) {
			layout.step();
			count++;
		}

		for(VertexRef v : vertices) {
			graphLayout.setLocation(v, (int)layout.getX(v), (int)layout.getY(v));
		}
	}
}
