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package hudson.plugins.helpers;

import org.kohsuke.stapler.StaplerRequest;
import org.kohsuke.stapler.StaplerResponse;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.CategoryLabelPositions;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.title.LegendTitle;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.data.category.CategoryDataset;
import org.jfree.ui.RectangleEdge;
import org.jfree.ui.RectangleInsets;

import java.io.IOException;
import java.awt.*;

import hudson.util.*;

/**
 * TODO javadoc.
 *
 * @author Stephen Connolly
 * @since 09-Jan-2008 21:30:15
 */
public class GraphHelper {
    /**
     * Do not instantiate GraphHelper.
     */
    private GraphHelper() {
    }

    /**
     * Getter for property 'graphUnsupported'.
     *
     * @return Value for property 'graphUnsupported'.
     */
    public static boolean isGraphUnsupported() {
        return ChartUtil.awtProblemCause != null;
    }

    public static void redirectWhenGraphUnsupported(StaplerResponse rsp, StaplerRequest req) throws IOException {
        // not available. send out error message
        rsp.sendRedirect2(req.getContextPath() + "/images/headless.png");
    }

    public static JFreeChart buildChart(CategoryDataset dataset) {

        final JFreeChart chart = ChartFactory.createLineChart(
                null,                   // chart title
                null,                   // unused
                "line count",                    // range axis label
                dataset,                  // data
                PlotOrientation.VERTICAL, // orientation
                true,                     // include legend
                true,                     // tooltips
                false                     // urls
        );

        // NOW DO SOME OPTIONAL CUSTOMISATION OF THE CHART...

        final LegendTitle legend = chart.getLegend();
        legend.setPosition(RectangleEdge.RIGHT);

        chart.setBackgroundPaint(Color.white);

        final CategoryPlot plot = chart.getCategoryPlot();

        // plot.setAxisOffset(new Spacer(Spacer.ABSOLUTE, 5.0, 5.0, 5.0, 5.0));
        plot.setBackgroundPaint(Color.WHITE);
        plot.setOutlinePaint(null);
        plot.setRangeGridlinesVisible(true);
        plot.setRangeGridlinePaint(Color.black);

        CategoryAxis domainAxis = new ShiftedCategoryAxis(null);
        plot.setDomainAxis(domainAxis);
        domainAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_90);
        domainAxis.setLowerMargin(0.0);
        domainAxis.setUpperMargin(0.0);
        domainAxis.setCategoryMargin(0.0);

        final NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
        rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
//        rangeAxis.setUpperBound(100);
//        rangeAxis.setLowerBound(0);

        plot.setRenderer(new StackedAreaRenderer2());
////        final LineAndShapeRenderer renderer = (LineAndShapeRenderer) plot.getRenderer();
////        renderer.setStroke(new BasicStroke(2.0f));
//        ColorPalette.apply(renderer);

        // crop extra space around the graph
        plot.setInsets(new RectangleInsets(5.0, 0, 0, 5.0));

        return chart;
    }
}