package de.intevation.flys.exports;

import java.util.Date;
import java.util.List;

import org.apache.log4j.Logger;

import org.w3c.dom.Document;

import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.Range;
import org.jfree.data.xy.XYSeries;

import de.intevation.artifacts.Artifact;

import de.intevation.artifactdatabase.state.Facet;

import de.intevation.flys.model.DischargeTable;
import de.intevation.flys.model.Gauge;
import de.intevation.flys.model.River;
import de.intevation.flys.model.TimeInterval;

import de.intevation.flys.artifacts.WINFOArtifact;

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

import de.intevation.flys.utils.FLYSUtils;

/**
 * An OutGenerator that generates discharge curves.
 *
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class DischargeCurveGenerator extends XYChartGenerator {

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


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

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

    public static final String I18N_XAXIS_LABEL =
        "chart.discharge.curve.xaxis.label";

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

    public static final String I18N_CHART_TITLE_DEFAULT  = "Abflusskurven";
    public static final String I18N_XAXIS_LABEL_DEFAULT  = "Q [m\u00b3/s]";
    public static final String I18N_YAXIS_LABEL_DEFAULT  = "W [cm]";



    public DischargeCurveGenerator() {
        super();
    }


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


    @Override
    protected void addSubtitles(JFreeChart chart) {

    }


    protected String getXAxisLabel() {
        return msg(I18N_XAXIS_LABEL, I18N_XAXIS_LABEL_DEFAULT);
    }


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


    @Override
    protected boolean zoomX(XYPlot plot, ValueAxis axis, Range range, Range x) {
        boolean zoomin = super.zoom(plot, axis, range, x);

        if (!zoomin) {
            axis.setLowerBound(0d);
        }

        return zoomin;
    }


    public void doOut(
        Artifact artifact,
        Facet    facet,
        Document attr,
        boolean  visible
    ) {
        logger.debug("DischargeCurveGenerator.doOut: " + facet.getName());

        if (!(artifact instanceof WINFOArtifact)) {
            logger.debug("Artifact is no instance of WINFOArtifact.");
            return;
        }

        WINFOArtifact flysArtifact = (WINFOArtifact) artifact;

        facet = flysArtifact.getNativeFacet(facet);

        if (facet == null) {
            logger.debug("no facet found");
            return;
        }

        WQKms wqkms = (WQKms)facet.getData(flysArtifact, context);

        String gaugeName = wqkms.getName();

        River river = FLYSUtils.getRiver(flysArtifact);

        if (river == null) {
            logger.debug("no river found");
            return;
        }

        Gauge gauge = river.determineGaugeByName(gaugeName);

        if (gauge == null) {
            logger.debug("no gauge found");
            return;
        }

        String seriesName = getSeriesName(gauge);

        double [][] values = new double [][] {
            wqkms.getQs(), wqkms.getWs() };

        int size = values != null ? values[0].length : 0;

        XYSeries series = new StyledXYSeries(seriesName, attr);

        for (int i = 0; i < size; i++) {
            series.add(values[0][i], values[1][i]);
        }

        addFirstAxisSeries(series, visible);
    }


    protected String getSeriesName(Gauge gauge) {
         //XXX The following code stops the artifact server accepting new HTTP
         //requests. It needs more analysis! Is loading the discharge table a
         //memory problem? Or is the time interval the problem?

        List<DischargeTable> dts = gauge.getDischargeTables();

        for (DischargeTable dt: dts) {
            if (dt.getKind() == 0) {
                TimeInterval ti = dt.getTimeInterval();

                Date start = ti.getStartTime();
                Date end   = ti.getStopTime();

                String name  = gauge.getName();

                if (end == null) {
                    Object[] args = new Object[] { name, start };
                    return msg(
                        "chart.discharge.curve.curve.valid.from",
                        "",
                        args);
                }
                else {
                    Object[] args = new Object[] { name, start, end };
                    return msg(
                        "chart.discharge.curve.curve.valid.range",
                        "",
                        args);
                }
            }
        }

        return gauge.getName();
    }
}
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