/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.optaplanner.examples.tsp.optional.score;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.optaplanner.core.api.score.buildin.simplelong.SimpleLongScore;
import org.optaplanner.core.api.score.calculator.EasyScoreCalculator;
import org.optaplanner.examples.tsp.domain.Domicile;
import org.optaplanner.examples.tsp.domain.Standstill;
import org.optaplanner.examples.tsp.domain.TspSolution;
import org.optaplanner.examples.tsp.domain.Visit;

public class TspEasyScoreCalculator implements EasyScoreCalculator<TspSolution, SimpleLongScore> {

    @Override
    public SimpleLongScore calculateScore(TspSolution tspSolution) {
        List<Visit> visitList = tspSolution.getVisitList();
        Set<Visit> tailVisitSet = new HashSet<>(visitList);
        long score = 0L;
        for (Visit visit : visitList) {
            Standstill previousStandstill = visit.getPreviousStandstill();
            if (previousStandstill != null) {
                score -= visit.getDistanceFromPreviousStandstill();
                if (previousStandstill instanceof Visit) {
                    tailVisitSet.remove(previousStandstill);
                }
            }
        }
        Domicile domicile = tspSolution.getDomicile();
        for (Visit tailVisit : tailVisitSet) {
            if (tailVisit.getPreviousStandstill() != null) {
                score -= tailVisit.getDistanceTo(domicile);
            }
        }
        return SimpleLongScore.of(score);
    }

}
