package de.intevation.flys.exports;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Paint;
import java.awt.Stroke;

import java.text.NumberFormat;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.w3c.dom.Document;

import org.apache.log4j.Logger;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.LegendItemCollection;
import org.jfree.chart.annotations.XYBoxAnnotation;
import org.jfree.chart.annotations.XYLineAnnotation;
import org.jfree.chart.annotations.XYTextAnnotation;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.Range;
import org.jfree.data.general.Series;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
import org.jfree.data.xy.XYDataset;

import org.jfree.ui.RectangleInsets;
import org.jfree.ui.TextAnchor;

import de.intevation.artifactdatabase.state.Facet;

import de.intevation.flys.jfree.FLYSAnnotation;
import de.intevation.flys.jfree.StickyAxisAnnotation;
import de.intevation.flys.jfree.CollisionFreeXYTextAnnotation;
import de.intevation.flys.jfree.StyledAreaSeriesCollection;
import de.intevation.flys.jfree.StyledXYSeries;

import de.intevation.flys.utils.ThemeAccess;

import de.intevation.flys.artifacts.model.HYKFactory;

import org.json.JSONArray;
import org.json.JSONException;


/**
 * An abstract base class for creating XY charts.
 *
 * With respect to datasets, ranges and axis, there are following requirements:
 * <ul>
 *   <li> First in, first drawn: "Early" datasets should be of lower Z-Oder
 *        than later ones (only works per-axis). </li>
 *   <li> Visible axis should initially show the range of all datasets that
 *        show data for this axis (even invisible ones). Motivation: Once
 *        a dataset (theme) has been activated, it should be on screen. </li>
 *   <li> There should always be a Y-Axis on the "left". </li>
 * </ul>
 *
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public abstract class XYChartGenerator extends ChartGenerator {

    // TODO Consider storing the renderer here.
    private class XYAxisDataset implements AxisDataset {
        /** Symbolic integer, but also coding the priority (0 goes first). */
        protected int axisSymbol;
        /** List of assigned datasets (in order). */
        protected List<XYDataset> datasets;
        /** Range to use to include all given datasets. */
        protected Range range;
        /** Index of axis in plot. */
        protected int plotAxisIndex;

        /** Create AxisDataset. */
        public XYAxisDataset(int symb) {
            this.axisSymbol = symb;
            datasets        = new ArrayList<XYDataset>();
        }

        /** Merge (or create given range with range so far (if any). */
        private void mergeRanges(Range subRange) {
            // Avoid merging NaNs, as they take min/max place forever.
            if (subRange == null ||
                Double.isNaN(subRange.getLowerBound()) ||
                Double.isNaN(subRange.getUpperBound())) {
                return;
            }
            if (range == null) {
                range = subRange;
                return;
            }
            range = Range.combine(range, subRange);
        }


        @Override
        public void addDataset(XYDataset dataset) {
            datasets.add(dataset);
            includeYRange(((XYSeriesCollection) dataset).getSeries(0));
        }

        /** Add a dataset, include its range. */
        public void addDataset(XYSeries series) {
            addDataset(new XYSeriesCollection(series));
        }


        @Override
        public void setRange(Range range) {
            this.range = range;
        }


        @Override
        public Range getRange() {
            return range;
        }


        @Override
        public XYDataset[] getDatasets() {
            return (XYDataset[])
                datasets.toArray(new XYDataset[datasets.size()]);
        }

        public void addArea(StyledAreaSeriesCollection series) {
            this.datasets.add(series);
        }

        /** True if to be renedered as area. */
        @Override
        public boolean isArea(XYDataset series) {
            return (series instanceof StyledAreaSeriesCollection);
        }

        /** Adjust range to include given dataset. */
        public void includeYRange(XYSeries dataset) {
            mergeRanges(new Range(dataset.getMinY(), dataset.getMaxY()));
        }

        /** True if no datasets given. */
        @Override
        public boolean isEmpty() {
            return this.datasets.isEmpty();
        }

        /** Set the 'real' axis index that this axis is mapped to. */
        @Override
        public void setPlotAxisIndex(int axisIndex) {
            this.plotAxisIndex = axisIndex;
        }

        /** Get the 'real' axis index that this axis is mapped to. */
        @Override
        public int getPlotAxisIndex() {
            return this.plotAxisIndex;
        }
    } // class AxisDataset


    /** Override to make axis information available. */
    protected YAxisWalker getYAxisWalker() {
        return new YAxisWalker() {
            /** Get number of items. */
            @Override
            public int length() {
                return 0;
            }

            /** Get identifier for this index. */
            @Override
            public String getId(int idx) {
                return null;
            }
        };
    }


    /** The logger that is used in this generator. */
    private static Logger logger = Logger.getLogger(XYChartGenerator.class);

    /** List of annotations to insert in plot. */
    protected List<FLYSAnnotation> annotations;

    /** The max X range to include all X values of all series for each axis. */
    protected Map<Integer, Range> xRanges;

    /** The max Y range to include all Y values of all series for each axis. */
    protected Map<Integer, Range> yRanges;


    public XYChartGenerator() {
        super();

        xRanges  = new HashMap<Integer, Range>();
        yRanges  = new HashMap<Integer, Range>();
    }


    /**
     * Generate the chart anew (including localized axis and all).
     */
    public JFreeChart generateChart() {
        logger.debug("XYChartGenerator.generateChart");

        JFreeChart chart = ChartFactory.createXYLineChart(
            getChartTitle(),
            getXAxisLabel(),
            getYAxisLabel(0),
            null,
            PlotOrientation.VERTICAL,
            isLegendVisible(),
            false,
            false);

        XYPlot plot = (XYPlot) chart.getPlot();
        chart.setBackgroundPaint(Color.WHITE);
        plot.setBackgroundPaint(Color.WHITE);
        addSubtitles(chart);
        adjustPlot(plot);

        //debugAxis(plot);

        addDatasets(plot);

        //debugDatasets(plot);

        recoverEmptyPlot(plot);
        preparePointRanges(plot);

        //debugAxis(plot);

        localizeAxes(plot);
        adjustAxes(plot);
        autoZoom(plot);

        // These have to go after the autozoom.
        addAnnotationsToRenderer(plot);

        return chart;
    }


    @Override
    protected Series getSeriesOf(XYDataset dataset, int idx) {
        return ((XYSeriesCollection) dataset).getSeries(idx);
    }


    @Override
    protected void setXRange(int axis, Range range) {
        xRanges.put(Integer.valueOf(axis), range);
    }


    @Override
    protected void setYRange(int axis, Range range) {
        yRanges.put(Integer.valueOf(axis), range);
    }


    @Override
    protected AxisDataset createAxisDataset(int idx) {
        logger.debug("Create new XYAxisDataset for index: " + idx);
        return new XYAxisDataset(idx);
    }


    /**
     * Put debug output about datasets.
     */
    public void debugDatasets(XYPlot plot) {
        logger.debug("Number of datasets: " + plot.getDatasetCount());
        for (int i = 0; i < plot.getDatasetCount(); i++) {
            if (plot.getDataset(i) == null) {
                logger.debug("Dataset #" + i + " is null");
                continue;
            }
            logger.debug("Dataset #" + i + ":" + plot.getDataset(i));
            XYSeriesCollection series = (XYSeriesCollection) plot.getDataset(i);
            logger.debug("X-Extend of Dataset: " + series.getSeries(0).getMinX()
                    + " " + series.getSeries(0).getMaxX());
            logger.debug("Y-Extend of Dataset: " + series.getSeries(0).getMinY()
                    + " " + series.getSeries(0).getMaxY());
        }
    }


    /**
     * Put debug output about axes.
     */
    public void debugAxis(XYPlot plot) {
        logger.debug("...............");
        for (int i = 0; i < plot.getRangeAxisCount(); i++) {
            if (plot.getRangeAxis(i) == null)
                logger.debug("Range-Axis #" + i + " == null");
            else {
                logger.debug("Range-Axis " + i + " != null [" +
                    plot.getRangeAxis(i).getRange().getLowerBound() +
                    "  " + plot.getRangeAxis(i).getRange().getUpperBound() +
                    "]");
            }

        }
        logger.debug("...............");
    }


    /**
     * Registers an area to be drawn.
     * @param area Area to be drawn.
     * @param index 'axis index'
     * @param visible Whether or not to be visible (important for range calculations).
     */
    public void addAreaSeries(StyledAreaSeriesCollection area, int index, boolean visible) {
        if (area == null) {
            logger.warn("Cannot yet render above/under curve.");
            return;
        }

        XYAxisDataset axisDataset = (XYAxisDataset) getAxisDataset(index);

        if (visible) {
            axisDataset.addArea(area);
        }
        else {
            // TODO only range merging.
        }
        //TODO range merging.
    }


    /**
     * Add given series if visible, if not visible adjust ranges (such that
     * all points in data would be plotted once visible).
     * @param series the dataseries to include in plot.
     * @param index  ('symbolic') index of the series and of its axis.
     * @param visible whether or not the data should be plotted.
     */
    public void addAxisSeries(XYSeries series, int index, boolean visible) {
        if (series == null) {
            return;
        }

        logger.debug("Y Range of XYSeries: " +
            series.getMinY() + " | " + series.getMaxY());

        addAxisDataset(new XYSeriesCollection(series), index, visible);

        XYAxisDataset axisDataset = (XYAxisDataset) getAxisDataset(index);

        if (!visible) {
            // Do this also when not visible to have axis scaled by default such
            // that every data-point could be seen (except for annotations).
            axisDataset.includeYRange(series);
        }
    }


    /**
     * Effect: extend range of x axis to include given limits.
     * @param range the given ("minimal") range.
     * @param index index of axis to be merged.
     */
    protected void combineXRanges(Range range, int index) {

        if (range == null
            || Double.isNaN(range.getLowerBound())
            || Double.isNaN(range.getUpperBound())) {
            return;
        }

        Range old = xRanges.get(index);

        if (old != null) {
            range = Range.combine(old, range);
        }

        xRanges.put(index, range);
    }


    /**
     * Adds annotations to list (if visible is true).
     */
    public void addAnnotations(FLYSAnnotation annotation, boolean visible) {
        if (!visible) {
            return;
        }

        if (annotations == null) {
            annotations = new ArrayList<FLYSAnnotation>();
        }

        annotations.add(annotation);
    }


    /**
     * If no data is visible, draw at least empty axis.
     */
    private void recoverEmptyPlot(XYPlot plot) {
        if (plot.getRangeAxis() == null) {
            logger.debug("debug: No range axis");
            plot.setRangeAxis(createYAxis(0));
        }
    }


    /**
     * Expands X axes if only a point is shown.
     */
    private void preparePointRanges(XYPlot plot) {
        for (int i = 0, num = plot.getDomainAxisCount(); i < num; i++) {
            logger.debug("Check whether to expand a x axis.");
            Integer key = Integer.valueOf(i);

            Range r = xRanges.get(key);
            if (r != null && r.getLowerBound() == r.getUpperBound()) {
                setXRange(key, ChartHelper.expandRange(r, 5));
            }
        }
    }


    /**
     * This method zooms the plot to the specified ranges in the attribute
     * document or to the ranges specified by the min/max values in the
     * datasets. <b>Note:</b> We determine the range manually if no zoom ranges
     * are given, because JFreeCharts auto-zoom adds a margin to the left and
     * right of the data area.
     *
     * @param plot The XYPlot.
     */
    protected void autoZoom(XYPlot plot) {
        logger.debug("Zoom to specified ranges.");

        Range xrange = getDomainAxisRange();
        Range yrange = getValueAxisRange();

        ValueAxis xAxis = plot.getDomainAxis();

        Range fixedXRange = getRangeForAxisFromSettings("X");
        if (fixedXRange != null) {
            xAxis.setRange(fixedXRange);
        }
        else {
            zoomX(plot, xAxis, xRanges.get(0), xrange);
        }

        for (int i = 0, num = plot.getRangeAxisCount(); i < num; i++) {
            ValueAxis yaxis = plot.getRangeAxis(i);

            if (yaxis instanceof IdentifiableNumberAxis) {
                IdentifiableNumberAxis idAxis = (IdentifiableNumberAxis) yaxis;

                Range fixedRange = getRangeForAxisFromSettings(idAxis.getId());
                if (fixedRange != null) {
                    yaxis.setRange(fixedRange);
                    continue;
                }
            }

            if (yaxis == null) {
                logger.debug("Zoom problem: no Y Axis for index: " + i);
                continue;
            }

            logger.debug("Prepare zoom settings for y axis at index: " + i);
            zoomY(plot, yaxis, yRanges.get(Integer.valueOf(i)), yrange);
        }
    }


    protected boolean zoomX(XYPlot plot, ValueAxis axis, Range range, Range x) {
        return zoom(plot, axis, range, x);
    }


    protected boolean zoomY(XYPlot plot, ValueAxis axis, Range range, Range x) {
        return zoom(plot, axis, range, x);
    }


    /**
     * Zooms the x axis to the range specified in the attribute document.
     *
     * @param plot  The XYPlot.
     * @param axis  The axis the shoud be modified.
     * @param range The whole range specified by a dataset.
     * @param x     A user defined range (null permitted).
     *
     * @return true, if a zoom range was specified, otherwise false.
     */
    protected boolean zoom(XYPlot plot, ValueAxis axis, Range range, Range x) {

        if (range == null) {
            return false;
        }

        if (x != null) {
            double min  = range.getLowerBound();
            double max  = range.getUpperBound();
            double diff = max > min ? max - min : min - max;

            Range computed = new Range(
                min + x.getLowerBound() * diff,
                min + x.getUpperBound() * diff);

            axis.setRangeWithMargins(computed);

            logger.debug("Zoom axis to: " + computed);

            return true;
        }

        axis.setRangeWithMargins(range);
        return false;
    }


    /**
     * This method extracts the minimum and maximum values for x and y axes
     * which are stored in <i>xRanges</i> and <i>yRanges</i>.
     *
     * @param index The index of the y-Axis.
     *
     * @return a Range[] as follows: [x-Range, y-Range].
     */
    public Range[] getRangesForAxis(int index) {
        logger.debug("getRangesForAxis " + index);

        Range rx = xRanges.get(Integer.valueOf(0));
        Range ry = yRanges.get(Integer.valueOf(index));

        if (rx == null) {
            logger.warn("Range for x axis not set." +
                        " Using default values: 0 - 1.");
            rx = new Range(0, 1);
        }
        if (ry == null) {
            logger.warn("Range for y" + index +
                        " axis not set. Using default values: 0 - 1.");
            ry = new Range(0, 1);
        }
        return new Range[] {rx, ry};
    }


    /** Get color for hyk zones by their type (which is the name). */
    public Paint colorForHYKZone(String zoneName) {
        if (zoneName.startsWith("R")) {
            // Brownish.
            return new Color(153, 60, 0);
        }
        else if (zoneName.startsWith("V")) {
            // Greenish.
            return new Color(0, 255, 0);
        }
        else if (zoneName.startsWith("B")) {
            // Grayish.
            return new Color(128, 128, 128);
        }
        else if (zoneName.startsWith("H")) {
            // Blueish.
            return new Color(0, 0, 255);
        }
        else {
            // Default.
            logger.debug("Unknown zone type found.");
            return new Color(255, 0, 0);
        }
    }


    /**
     * Add a text and a line annotation.
     */
    public void addStickyAnnotation(
        StickyAxisAnnotation annotation,
        XYPlot plot,
        Area area,
        ThemeAccess.LineStyle lineStyle,
        ThemeAccess.TextStyle textStyle
    ) {
        // OPTIMIZE pre-calculate area-related values
        final float TEXT_OFF = 0.03f;
        final float LINE_OFF = 0.02f;

        XYLineAnnotation lineAnnotation = null;
        XYTextAnnotation textAnnotation = null;

        int rendererIndex = 0;

        if (annotation.atX()) {
            textAnnotation = new CollisionFreeXYTextAnnotation(
                annotation.getText(), annotation.getPos(), area.ofGround(TEXT_OFF));
            // OPTIMIZE externalize the calculation involving PI.
            textAnnotation.setRotationAngle(270f*Math.PI/180f);
            // Style the line.
            if (lineStyle != null) {
                lineAnnotation = new XYLineAnnotation(annotation.getPos(),
                    area.atGround(), annotation.getPos(), area.ofGround(LINE_OFF),
                    new BasicStroke(lineStyle.getWidth()),lineStyle.getColor());
                textAnnotation.setRotationAnchor(TextAnchor.CENTER_LEFT);
                textAnnotation.setTextAnchor(TextAnchor.CENTER_LEFT);
            }
            else {
                lineAnnotation = new XYLineAnnotation(annotation.getPos(),
                    area.atGround(), annotation.getPos(), area.ofGround(LINE_OFF));
                textAnnotation.setRotationAnchor(TextAnchor.CENTER_LEFT);
                textAnnotation.setTextAnchor(TextAnchor.CENTER_LEFT);
            }
        }
        else {
            // Do the more complicated case where we stick to the Y-Axis.
            // There is one nasty case (duration curves, where annotations
            // might stick to the second y-axis).
            XYAxisDataset dataset = (XYAxisDataset) getAxisDataset(
                new Integer(annotation.getAxisSymbol()));
            if (dataset == null) {
                logger.warn("Annotation should stick to unfindable y-axis: "
                    + annotation.getAxisSymbol());
                rendererIndex = 0;
            }
            else {
                rendererIndex = dataset.getPlotAxisIndex();
            }

            if (rendererIndex != 0) {
                // OPTIMIZE: Pass a different area to this function,
                //           do the adding to renderer outside (let this
                //           function return the annotations).
                //           Note that this path is travelled rarely.
                Area area2 = new Area(plot.getDomainAxis(), plot.getRangeAxis(rendererIndex));
                textAnnotation = new CollisionFreeXYTextAnnotation(
                    annotation.getText(), area2.ofRight(TEXT_OFF), annotation.getPos());
                textAnnotation.setRotationAnchor(TextAnchor.CENTER_RIGHT);
                textAnnotation.setTextAnchor(TextAnchor.CENTER_RIGHT);
                // Style the line.
                if (lineStyle != null) {
                    lineAnnotation = new XYLineAnnotation(area2.ofRight(LINE_OFF),
                        annotation.getPos(), area2.atRight(),
                        annotation.getPos(), new BasicStroke(lineStyle.getWidth()),
                        lineStyle.getColor());
                }
                else {
                    lineAnnotation = new XYLineAnnotation(area2.atRight(),
                        annotation.getPos(), area2.ofRight(LINE_OFF), annotation.getPos());
                }
            }
            else {
                textAnnotation = new CollisionFreeXYTextAnnotation(
                    annotation.getText(), area.ofLeft(TEXT_OFF), annotation.getPos());
                textAnnotation.setRotationAnchor(TextAnchor.CENTER_LEFT);
                textAnnotation.setTextAnchor(TextAnchor.CENTER_LEFT);
                // Style the line.
                if (lineStyle != null) {
                    lineAnnotation = new XYLineAnnotation(area.atLeft(),
                        annotation.getPos(), area.ofLeft(LINE_OFF),
                        annotation.getPos(), new BasicStroke(lineStyle.getWidth()),
                        lineStyle.getColor());
                }
                else {
                    lineAnnotation = new XYLineAnnotation(area.atLeft(),
                        annotation.getPos(), area.ofLeft(LINE_OFF), annotation.getPos());
                }
            }
        }

        // Style the text.
        if (textStyle != null) {
            textStyle.apply(textAnnotation);
        }

        // Add the Annotations to renderer.
        plot.getRenderer(rendererIndex).addAnnotation(textAnnotation,
            org.jfree.ui.Layer.BACKGROUND);
        plot.getRenderer(rendererIndex).addAnnotation(lineAnnotation,
            org.jfree.ui.Layer.BACKGROUND);
    }


    /** Add annotations (Sticky, Text and hyk zones). */
    public void addAnnotationsToRenderer(XYPlot plot) {
        logger.debug("XYChartGenerator.addAnnotationsToRenderer");

        if (annotations == null) {
            logger.debug("XYChartGenerator.addBoxAnnotations: no annotations.");
            return;
        }

        // Paints for the boxes/lines.
        Stroke basicStroke = new BasicStroke(1.0f);

        Paint linePaint = new Color(255,  0,0,60);
        Paint fillPaint = new Color(0,  255,0,60);
        Paint tranPaint = new Color(0,    0,0, 0);

        // OPTMIMIZE: Pre-calculate positions
        Area area = new Area(
            plot.getDomainAxis(0).getRange(),
            plot.getRangeAxis().getRange());

        // Walk over all Annotation sets.
        for (FLYSAnnotation fa: annotations) {

            // Access text styling, if any.
            Document theme = fa.getTheme();
            ThemeAccess.TextStyle textStyle = null;
            ThemeAccess.LineStyle lineStyle = null;

            // Get Themeing information and add legend item.
            if (theme != null) {
                ThemeAccess themeAccess = new ThemeAccess(theme);
                textStyle = themeAccess.parseTextStyle();
                lineStyle = themeAccess.parseLineStyle();
                if (fa.getLabel() != null) {
                    LegendItemCollection lic = new LegendItemCollection();
                    LegendItemCollection old = plot.getFixedLegendItems();
                    lic.add(createLegendItem(theme, fa.getLabel()));
                    // (Re-)Add prior legend entries.
                    if (old != null) {
                        old.addAll(lic);
                    }
                    else {
                        old = lic;
                    }
                    plot.setFixedLegendItems(old);
                }
            }

            // The 'Sticky' Annotations (at axis, with line and text).
            for (StickyAxisAnnotation sta: fa.getAxisTextAnnotations()) {
                addStickyAnnotation(sta, plot, area, lineStyle, textStyle);
            }

            // Other Text Annotations.
            for (XYTextAnnotation ta: fa.getTextAnnotations()) {
                // Style the text.
                if (textStyle != null) {
                    textStyle.apply(ta);
                }
                ta.setY(area.above(0.05d, ta.getY()));
                plot.getRenderer().addAnnotation(ta, org.jfree.ui.Layer.FOREGROUND);
            }

            // Hyks.
            for (HYKFactory.Zone zone: fa.getBoxes()) {
                // For each zone, create a box to fill with color, a box to draw
                // the lines and a text to display the type.
                fillPaint = colorForHYKZone(zone.getName());

                XYBoxAnnotation boxA = new XYBoxAnnotation(zone.getFrom(), area.atGround(),
                    zone.getTo(), area.ofGround(0.03f), basicStroke, tranPaint, fillPaint);
                XYBoxAnnotation boxB = new XYBoxAnnotation(zone.getFrom(), area.atGround(),
                    zone.getTo(), area.atTop(), basicStroke, fillPaint, tranPaint);

                XYTextAnnotation tex = new XYTextAnnotation(zone.getName(),
                    zone.getFrom() + (zone.getTo() - zone.getFrom()) / 2.0d,
                    area.ofGround(0.015f));
                if (textStyle != null) {
                    textStyle.apply(tex);
                }

                plot.getRenderer().addAnnotation(boxA, org.jfree.ui.Layer.BACKGROUND);
                plot.getRenderer().addAnnotation(boxB, org.jfree.ui.Layer.BACKGROUND);
                plot.getRenderer().addAnnotation(tex,  org.jfree.ui.Layer.BACKGROUND);
            }
        }
    }


    /**
     * Adjusts the axes of a plot. This method sets the <i>labelFont</i> of the
     * X axis.
     *
     * @param plot The XYPlot of the chart.
     */
    protected void adjustAxes(XYPlot plot) {
        ValueAxis xaxis = plot.getDomainAxis();

        ChartSettings chartSettings = getChartSettings();
        if (chartSettings == null) {
            return;
        }

        Font labelFont = new Font(
            DEFAULT_FONT_NAME,
            Font.BOLD,
            getXAxisLabelFontSize());

        xaxis.setLabelFont(labelFont);
    }


    /**
     * Set some Stroke/Grid defaults.
     */
    protected void adjustPlot(XYPlot plot) {
        Stroke gridStroke = new BasicStroke(
            DEFAULT_GRID_LINE_WIDTH,
            BasicStroke.CAP_BUTT,
            BasicStroke.JOIN_MITER,
            3.0f,
            new float[] { 3.0f },
            0.0f);

        ChartSettings      cs = getChartSettings();
        boolean isGridVisible = cs != null ? isGridVisible(cs) : true;

        plot.setDomainGridlineStroke(gridStroke);
        plot.setDomainGridlinePaint(DEFAULT_GRID_COLOR);
        plot.setDomainGridlinesVisible(isGridVisible);

        plot.setRangeGridlineStroke(gridStroke);
        plot.setRangeGridlinePaint(DEFAULT_GRID_COLOR);
        plot.setRangeGridlinesVisible(isGridVisible);

        plot.setAxisOffset(new RectangleInsets(0d, 0d, 0d, 0d));
    }


    /**
     * This method walks over all axes (domain and range) of <i>plot</i> and
     * calls localizeDomainAxis() for domain axes or localizeRangeAxis() for
     * range axes.
     *
     * @param plot The XYPlot.
     */
    private void localizeAxes(XYPlot plot) {
        for (int i = 0, num = plot.getDomainAxisCount(); i < num; i++) {
            ValueAxis axis = plot.getDomainAxis(i);

            if (axis != null) {
                localizeDomainAxis(axis);
            }
            else {
                logger.warn("Domain axis at " + i + " is null.");
            }
        }

        for (int i = 0, num = plot.getRangeAxisCount(); i < num; i++) {
            ValueAxis axis = plot.getRangeAxis(i);

            if (axis != null) {
                localizeRangeAxis(axis);
            }
            else {
                logger.warn("Range axis at " + i + " is null.");
            }
        }
    }


    /**
     * Overrides the NumberFormat with the NumberFormat for the current locale
     * that is provided by getLocale().
     *
     * @param domainAxis The domain axis that needs localization.
     */
    protected void localizeDomainAxis(ValueAxis domainAxis) {
        NumberFormat nf = NumberFormat.getInstance(getLocale());
        ((NumberAxis) domainAxis).setNumberFormatOverride(nf);
    }


    /**
     * Overrides the NumberFormat with the NumberFormat for the current locale
     * that is provided by getLocale().
     *
     * @param domainAxis The domain axis that needs localization.
     */
    protected void localizeRangeAxis(ValueAxis rangeAxis) {
        NumberFormat nf = NumberFormat.getInstance(getLocale());
        ((NumberAxis) rangeAxis).setNumberFormatOverride(nf);
    }


    /**
     * Register annotations like MainValues for later plotting
     *
     * @param o     list of annotations (data of facet).
     * @param facet The facet. This facet does NOT support any data objects. Use
     * FLYSArtifact.getNativeFacet() instead to retrieve a Facet which supports
     * data.
     * @param theme   Theme document for given annotations.
     * @param visible The visibility of the annotations.
     */
    protected void doAnnotations(
        FLYSAnnotation annotations,
        Facet facet,
        Document theme,
        boolean visible
    ){
        logger.debug("doAnnotations");

        // Add all annotations to our annotation pool.
        annotations.setTheme(theme);
        if (facet != null)
            annotations.setLabel(facet.getDescription());
        addAnnotations(annotations, visible);
    }


    /**
     * Do Points out.
     */
    protected void doPoints(
        Object     o,
        String     seriesName,
        Document   theme,
        boolean    visible,
        int        axisIndex
    ) {
        XYSeries series = new StyledXYSeries(seriesName, theme);

        // Add text annotations for single points.
        List<XYTextAnnotation> xy = new ArrayList<XYTextAnnotation>();

        try {
            JSONArray points = new JSONArray((String) o);
            for (int i = 0; i < points.length(); i++) {
                JSONArray array = points.getJSONArray(i);
                double x    = array.getDouble(0);
                double y    = array.getDouble(1);
                String name = array.getString(2);
                boolean act = array.getBoolean(3);
                if (!act) {
                    continue;
                }
                //logger.debug(" x " + x + " y " + y );
                series.add(x, y, false);
                xy.add(new CollisionFreeXYTextAnnotation(name, x, y));
            }
        }
        catch(JSONException e){
            logger.error("Could not decode json.");
        }
        
        FLYSAnnotation annotations = new FLYSAnnotation(null, null, null, theme);
        annotations.setTextAnnotations(xy);

        doAnnotations(annotations, null, theme, visible);
        addAxisSeries(series, axisIndex, visible);
    }


    /** Two Ranges that span a rectangular area. */
    public static class Area {
        protected Range xRange;
        protected Range yRange;

        public Area(Range rangeX, Range rangeY) {
            this.xRange = rangeX;
            this.yRange = rangeY;
        }

        public Area(ValueAxis axisX, ValueAxis axisY) {
            this.xRange = axisX.getRange();
            this.yRange = axisY.getRange();
        }

        public double ofLeft(double percent) {
            return xRange.getLowerBound()
                + xRange.getLength() * percent;
        }

        public double ofRight(double percent) {
            return xRange.getUpperBound()
                - xRange.getLength() * percent;
        }

        public double ofGround(double percent) {
            return yRange.getLowerBound()
                + yRange.getLength() * percent;
        }

        public double atTop() {
            return yRange.getUpperBound();
        }

        public double atGround() {
            return yRange.getLowerBound();
        }

        public double atRight() {
            return xRange.getUpperBound();
        }

        public double atLeft() {
            return xRange.getLowerBound();
        }

        public double above(double percent, double base) {
            return base + yRange.getLength() * percent;
        }
    }
}
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