package de.intevation.flys.exports;

import org.apache.log4j.Logger;

import java.util.ArrayList;
import java.util.List;

import org.w3c.dom.Document;

import org.jfree.chart.JFreeChart;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.xy.XYSeries;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.XYPlot;
import org.jfree.ui.TextAnchor;

import de.intevation.artifacts.Artifact;

import de.intevation.artifactdatabase.state.Facet;

import de.intevation.flys.artifacts.FLYSArtifact;
import de.intevation.flys.artifacts.model.FacetTypes;
import de.intevation.flys.artifacts.model.WQKms;
import de.intevation.flys.jfree.StickyAxisAnnotation;

import de.intevation.flys.model.MainValue;

/**
 * An OutGenerator that generates discharge curves.
 *
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class ComputedDischargeCurveGenerator
extends      DischargeCurveGenerator
implements   FacetTypes
{
    /** The logger used in this generator. */
    private static Logger logger =
        Logger.getLogger(ComputedDischargeCurveGenerator.class);


    public static final String I18N_CHART_TITLE =
        "chart.computed.discharge.curve.title";

    public static final String I18N_CHART_SUBTITLE =
        "chart.computed.discharge.curve.subtitle";

    public static final String I18N_YAXIS_LABEL =
        "chart.computed.discharge.curve.yaxis.label";

    public static final String I18N_CHART_TITLE_DEFAULT = "Abflusskurve";
    public static final String I18N_YAXIS_LABEL_DEFAULT = "W [NN + m]";

    /** List of MainValues (Annotations in plot). */
    protected static List<MainValue> mainValues;


    /** Trivial Constructor. */
    public ComputedDischargeCurveGenerator () {
        super();
        mainValues = new ArrayList<MainValue>();
    }


    @Override
    protected String getChartTitle() {
        return msg(I18N_CHART_TITLE, I18N_CHART_TITLE_DEFAULT);
    }


    @Override
    protected void addSubtitles(JFreeChart chart) {
        double[] dist  = getRange();

        Object[] args = new Object[] {
            getRiverName(),
            dist[0]
        };

        String subtitle = msg(I18N_CHART_SUBTITLE, "", args);
        chart.addSubtitle(new TextTitle(subtitle));
    }


    @Override
    protected String getYAxisLabel() {
        return msg(I18N_YAXIS_LABEL, I18N_YAXIS_LABEL_DEFAULT);
    }


    @Override
    public void doOut(Artifact artifact, Facet facet, Document attr) {
        String name = (facet != null) ? facet.getName() : null;

        logger.debug("ComputedDischargeCurveGenerator.doOut: " + name);

        FLYSArtifact flys = (FLYSArtifact) artifact;
        Facet        f    = flys.getNativeFacet(facet);

        if (name.equals(COMPUTED_DISCHARGE_Q)) {
            doQOut((WQKms) f.getData(artifact, context), attr);
        }
        else if (name.equals(COMPUTED_DISCHARGE_MAINVALUES)) {
            doMainValueAnnotations(f.getData(artifact, context), attr);
        }
        else {
            logger.warn("Unknown facet type for computed discharge: " + name);
            return;
        }
    }


    /**
     * Add MainValues as annotations to plot.
     */
    protected void doMainValueAnnotations(Object o, Document theme) {
        this.mainValues = (List<MainValue>) o;
    }


    /** Generate Chart with annotations. */
    @Override
    public JFreeChart generateChart() {
        JFreeChart c = super.generateChart();
        XYPlot p = (XYPlot) c.getPlot();
        redoAnnotations(p, p.getDomainAxis());
        return c;
    }


    /**
     * Recalculate some annotation positions and add them to plot.
     * Annotations represent MainValues.
     * @param plot      Plot to add annotations to.
     * @param valueAxis ignored.
     */
    protected void redoAnnotations(XYPlot plot, ValueAxis axis) {
        plot.clearAnnotations();
        ValueAxis yAxis = plot.getRangeAxis();
        float posY = 140.f;
        if (yAxis != null) {
            posY = (float) yAxis.getRange().getLowerBound();
            // Add some (2%) space between Text and axis.
            // TODO have all the position logic in StickyAxisAnnotation
            //      (then merge LongitudinalSectioNGenerator).
            posY += 0.02f * (yAxis.getRange().getUpperBound()
                        - yAxis.getRange().getLowerBound());
        }
        // Add all MainValues as annotations.
        // TODO Implement and handle second facet for annotations on
        //      vertical axis.
        for (MainValue mv: mainValues) {
            if (mv.getMainValue().getType().getName() == "W") {
                continue;
            }
            float posX = mv.getValue().floatValue();

            String text = mv.getMainValue().getName();
            StickyAxisAnnotation ta = new StickyAxisAnnotation(text, posX, posY);
            plot.getRenderer().addAnnotation(ta);
        }
    }


    /**
     * Add Q-Series to plot.
     * @param wqkms actual data
     * @param theme theme to use.
     */
    protected void doQOut(WQKms wqkms, Document theme) {
        int size = wqkms.size();

        double[]   res  = new double[3];

        XYSeries series = new StyledXYSeries(getSeriesName(wqkms), theme);
        for (int i = 0; i < size; i++) {
            res = wqkms.get(i, res);
            series.add(res[1], res[0]);
        }

        addFirstAxisSeries(series);
    }


    protected String getSeriesName(WQKms wqkms) {
        Object[] args = new Object[] {
            getRiverName(),
            wqkms.getName()
        };

        return msg(
            "chart.computed.discharge.curve.curve.label",
            "",
            args);
    }
}
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