/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j 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.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.graphalgo.impl.util;

import java.util.Iterator;
import org.neo4j.graphalgo.CostEvaluator;
import org.neo4j.graphalgo.WeightedPath;
import org.neo4j.graphdb.Direction;
import org.neo4j.graphdb.Entity;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Path;
import org.neo4j.graphdb.Relationship;

public class WeightedPathImpl implements WeightedPath {
    private final Path path;
    private final double weight;

    public WeightedPathImpl(CostEvaluator<Double> costEvaluator, Path path) {
        this.path = path;
        double cost = 0;
        for (Relationship relationship : path.relationships()) {
            cost += costEvaluator.getCost(relationship, Direction.OUTGOING);
        }
        this.weight = cost;
    }

    public WeightedPathImpl(double weight, Path path) {
        this.path = path;
        this.weight = weight;
    }

    @Override
    public double weight() {
        return weight;
    }

    @Override
    public Node startNode() {
        return path.startNode();
    }

    @Override
    public Node endNode() {
        return path.endNode();
    }

    @Override
    public Relationship lastRelationship() {
        return path.lastRelationship();
    }

    @Override
    public int length() {
        return path.length();
    }

    @Override
    public Iterable<Node> nodes() {
        return path.nodes();
    }

    @Override
    public Iterable<Node> reverseNodes() {
        return path.reverseNodes();
    }

    @Override
    public Iterable<Relationship> relationships() {
        return path.relationships();
    }

    @Override
    public Iterable<Relationship> reverseRelationships() {
        return path.reverseRelationships();
    }

    @Override
    public String toString() {
        return path + " weight:" + this.weight;
    }

    @Override
    public Iterator<Entity> iterator() {
        return path.iterator();
    }
}
