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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library 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 Lesser General Public License for more
 * details.
 */

package com.liferay.portal.upgrade.internal.graph;

import com.liferay.portal.kernel.util.Function;
import com.liferay.portal.kernel.util.ListUtil;
import com.liferay.portal.upgrade.registry.UpgradeInfo;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;

import org.jgrapht.DirectedGraph;
import org.jgrapht.alg.DijkstraShortestPath;
import org.jgrapht.graph.DefaultDirectedGraph;

/**
 * @author Miguel Pastor
 * @author Carlos Sierra Andrés
 */
public class ReleaseGraphManager {

	public ReleaseGraphManager(final List upgradeInfos) {
		_directedGraph = new DefaultDirectedGraph<>(
			new UpgradeProcessEdgeFactory(upgradeInfos));

		for (UpgradeInfo upgradeInfo : upgradeInfos) {
			_directedGraph.addVertex(upgradeInfo.getFromSchemaVersionString());
			_directedGraph.addVertex(upgradeInfo.getToSchemaVersionString());

			_directedGraph.addEdge(
				upgradeInfo.getFromSchemaVersionString(),
				upgradeInfo.getToSchemaVersionString(),
				new UpgradeProcessEdge(upgradeInfo));
		}
	}

	public List getUpgradeInfos(
		String fromVersionString, String toVersionString) {

		if (!_directedGraph.containsVertex(fromVersionString)) {
			return Collections.emptyList();
		}

		if (!_directedGraph.containsVertex(toVersionString)) {
			return Collections.emptyList();
		}

		DijkstraShortestPath dijkstraShortestPath =
			new DijkstraShortestPath<>(
				_directedGraph, fromVersionString, toVersionString);

		List upgradeProcessEdges =
			dijkstraShortestPath.getPathEdgeList();

		if (upgradeProcessEdges == null) {
			return Collections.emptyList();
		}

		return ListUtil.toList(
			upgradeProcessEdges,
			new Function() {

				@Override
				public UpgradeInfo apply(
					UpgradeProcessEdge upgradeProcessEdge) {

					return upgradeProcessEdge.getUpgradeInfo();
				}

			});
	}

	public List> getUpgradeInfosList(
		String fromVersionString) {

		List endVertices = getEndVertices();

		endVertices.remove(fromVersionString);

		List> upgradeInfosList = new ArrayList<>();

		for (String endVertex : endVertices) {
			List upgradeInfos = getUpgradeInfos(
				fromVersionString, endVertex);

			if (upgradeInfos.isEmpty()) {
				continue;
			}

			upgradeInfosList.add(upgradeInfos);
		}

		return upgradeInfosList;
	}

	protected List getEndVertices() {
		final List endVertices = new ArrayList<>();

		Set vertices = _directedGraph.vertexSet();

		for (String vertex : vertices) {
			Set upgradeProcessEdges =
				_directedGraph.outgoingEdgesOf(vertex);

			if (upgradeProcessEdges.isEmpty()) {
				endVertices.add(vertex);
			}
		}

		return endVertices;
	}

	private final DirectedGraph _directedGraph;

}