/*
 * Copyright 2014 JBoss Inc
 *
 * Licensed 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.persistence;

import java.io.IOException;

import org.optaplanner.core.impl.solution.Solution;
import org.optaplanner.examples.common.persistence.AbstractTxtSolutionExporter;
import org.optaplanner.examples.curriculumcourse.domain.Lecture;
import org.optaplanner.examples.tsp.domain.Standstill;
import org.optaplanner.examples.tsp.domain.TravelingSalesmanTour;
import org.optaplanner.examples.tsp.domain.Visit;

public class TspExporter extends AbstractTxtSolutionExporter {

    private static final String OUTPUT_FILE_SUFFIX = "tour";

    public static void main(String[] args) {
        new TspExporter().convertAll();
    }

    public TspExporter() {
        super(new TspDao());
    }

    @Override
    protected String getOutputFileSuffix() {
        return OUTPUT_FILE_SUFFIX;
    }

    public TxtOutputBuilder createTxtOutputBuilder() {
        return new TspOutputBuilder();
    }

    public static class TspOutputBuilder extends TxtOutputBuilder {

        private TravelingSalesmanTour tour;

        public void setSolution(Solution solution) {
            tour = (TravelingSalesmanTour) solution;
        }

        public void writeSolution() throws IOException {
            bufferedWriter.write("NAME : " + tour.getName() + "\n");
            bufferedWriter.write("TYPE : TOUR\n");
            bufferedWriter.write("DIMENSION : " + tour.getCityList().size() + "\n");
            bufferedWriter.write("TOUR_SECTION\n");
            if (tour.getDomicileList().size() != 1) {
                throw new UnsupportedOperationException(
                        "The domicileList (" + tour.getDomicileList() + ") should be a singleton.");
            }
            Standstill standstill = tour.getDomicileList().get(0);
            while (standstill != null) {
                bufferedWriter.write(standstill.getCity().getId() + "\n");
                standstill = findNextVisit(standstill);
            }
            bufferedWriter.write("EOF\n");
        }

        private Standstill findNextVisit(Standstill standstill) {
            for (Visit visit : tour.getVisitList()) {
                if (visit.getPreviousStandstill() == standstill) {
                    return visit;
                }
            }
            return null;
        }
    }

}
