/*
 * Copyright 2013 Red Hat, Inc. and/or its affiliates.
 *
 * 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.benchmark.impl.statistic.bestsolutionmutation;

import java.awt.BasicStroke;
import java.io.File;
import java.text.NumberFormat;
import java.util.Collections;
import java.util.List;
import java.util.Locale;

import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.chart.renderer.xy.YIntervalRenderer;
import org.jfree.data.xy.XYIntervalSeries;
import org.jfree.data.xy.XYIntervalSeriesCollection;
import org.optaplanner.benchmark.config.statistic.ProblemStatisticType;
import org.optaplanner.benchmark.impl.report.BenchmarkReport;
import org.optaplanner.benchmark.impl.result.ProblemBenchmarkResult;
import org.optaplanner.benchmark.impl.result.SingleBenchmarkResult;
import org.optaplanner.benchmark.impl.result.SubSingleBenchmarkResult;
import org.optaplanner.benchmark.impl.statistic.ProblemStatistic;
import org.optaplanner.benchmark.impl.statistic.SubSingleStatistic;
import org.optaplanner.benchmark.impl.statistic.common.MillisecondsSpentNumberFormat;

public class BestSolutionMutationProblemStatistic extends ProblemStatistic {

    protected File graphFile = null;

    public BestSolutionMutationProblemStatistic(ProblemBenchmarkResult problemBenchmarkResult) {
        super(problemBenchmarkResult, ProblemStatisticType.BEST_SOLUTION_MUTATION);
    }

    @Override
    public SubSingleStatistic createSubSingleStatistic(SubSingleBenchmarkResult subSingleBenchmarkResult) {
        return new BestSolutionMutationSubSingleStatistic(subSingleBenchmarkResult);
    }

    /**
     * @return never null
     */
    @Override
    public List<File> getGraphFileList() {
        return Collections.singletonList(graphFile);
    }

    // ************************************************************************
    // Write methods
    // ************************************************************************

    @Override
    public void writeGraphFiles(BenchmarkReport benchmarkReport) {
        XYPlot plot = createPlot(benchmarkReport);
        int seriesIndex = 0;
        for (SingleBenchmarkResult singleBenchmarkResult : problemBenchmarkResult.getSingleBenchmarkResultList()) {
            XYIntervalSeries series = new XYIntervalSeries(
                    singleBenchmarkResult.getSolverBenchmarkResult().getNameWithFavoriteSuffix());
            XYItemRenderer renderer = new YIntervalRenderer();
            if (singleBenchmarkResult.hasAllSuccess()) {
                BestSolutionMutationSubSingleStatistic subSingleStatistic =
                        (BestSolutionMutationSubSingleStatistic) singleBenchmarkResult
                                .getSubSingleStatistic(problemStatisticType);
                List<BestSolutionMutationStatisticPoint> points = subSingleStatistic.getPointList();
                for (BestSolutionMutationStatisticPoint point : points) {
                    long timeMillisSpent = point.getTimeMillisSpent();
                    long mutationCount = point.getMutationCount();
                    double yValue = mutationCount;
                    // In an XYInterval the yLow must be lower than yHigh
                    series.add(timeMillisSpent, timeMillisSpent, timeMillisSpent,
                            yValue, (yValue > 0.0) ? 0.0 : yValue, (yValue > 0.0) ? yValue : 0.0);
                }
            }
            XYIntervalSeriesCollection dataset = new XYIntervalSeriesCollection();
            dataset.addSeries(series);
            plot.setDataset(seriesIndex, dataset);

            if (singleBenchmarkResult.getSolverBenchmarkResult().isFavorite()) {
                // Make the favorite more obvious
                renderer.setSeriesStroke(0, new BasicStroke(2.0f));
            }
            plot.setRenderer(seriesIndex, renderer);
            seriesIndex++;
        }
        JFreeChart chart = new JFreeChart(problemBenchmarkResult.getName() + " best solution mutation statistic",
                JFreeChart.DEFAULT_TITLE_FONT, plot, true);
        graphFile = writeChartToImageFile(chart, problemBenchmarkResult.getName() + "BestSolutionMutationStatistic");
    }

    private XYPlot createPlot(BenchmarkReport benchmarkReport) {
        Locale locale = benchmarkReport.getLocale();
        NumberAxis xAxis = new NumberAxis("Time spent");
        xAxis.setNumberFormatOverride(new MillisecondsSpentNumberFormat(locale));
        NumberAxis yAxis = new NumberAxis("Best solution mutation count");
        yAxis.setNumberFormatOverride(NumberFormat.getInstance(locale));
        yAxis.setAutoRangeIncludesZero(true);
        XYPlot plot = new XYPlot(null, xAxis, yAxis, null);
        plot.setOrientation(PlotOrientation.VERTICAL);
        return plot;
    }

}
