package org.dive4elements.river.exports.process;

import org.apache.log4j.Logger;
import org.jfree.data.xy.XYSeries;
import org.w3c.dom.Document;

import org.dive4elements.artifactdatabase.state.ArtifactAndFacet;
import org.dive4elements.artifacts.CallContext;
import org.dive4elements.river.artifacts.model.FacetTypes;
import org.dive4elements.river.artifacts.model.WKms;
import org.dive4elements.river.exports.StyledSeriesBuilder;
import org.dive4elements.river.exports.XYChartGenerator;
import org.dive4elements.river.jfree.StyledAreaSeriesCollection;
import org.dive4elements.river.jfree.StyledXYSeries;
import org.dive4elements.river.utils.DataUtil;
import org.dive4elements.river.utils.ThemeUtil;

/**
 * Add data to chart/generator.
 *
 * @author <a href="mailto:bjoern.ricks@intevation.de">Björn Ricks</a>
 */
public class WOutProcessor implements Processor {

    /** Private logger. */
    private static final Logger logger =
            Logger.getLogger(WOutProcessor.class);

    @Override
    public void doOut(
            XYChartGenerator generator,
            ArtifactAndFacet aaf,
            Document         theme,
            boolean          visible,
            int              index)
    {
        CallContext context = generator.getCallContext();
        WKms wkms = (WKms) aaf.getData(context);

        logger.debug("doOut");

        XYSeries series = new StyledXYSeries(aaf.getFacetDescription(), theme);

        StyledSeriesBuilder.addPoints(series, wkms);
        generator.addAxisSeries(series, index, visible);

        // If a "band around the curve shall be drawn, add according area.
        double bandWidth = ThemeUtil.parseBandWidth(theme);
        if (bandWidth > 0 ) {
            XYSeries seriesDown = new StyledXYSeries(
                "band " + aaf.getFacetDescription(), false, theme);
            XYSeries seriesUp = new StyledXYSeries(
                aaf.getFacetDescription()+"+/-"+bandWidth, false, theme);
            StyledSeriesBuilder.addUpperBand(seriesUp, wkms, bandWidth);
            StyledSeriesBuilder.addLowerBand(seriesDown, wkms, bandWidth);

            StyledAreaSeriesCollection area = new StyledAreaSeriesCollection(theme);
            area.addSeries(seriesUp);
            area.addSeries(seriesDown);
            area.setMode(StyledAreaSeriesCollection.FILL_MODE.BETWEEN);
            generator.addAreaSeries(area, index, visible);
        }

        invertAxis(generator, wkms);
    }

    /**
     * Returns true if facettype is longitutinal_section.w .
     */
    @Override
    public boolean canHandle(String facetType) {
        if (facetType == null) {
            return false;
        }

        if (facetType.equals(FacetTypes.LONGITUDINAL_W)
                || facetType.equals(FacetTypes.STATIC_WKMS)
                || facetType.equals(FacetTypes.HEIGHTMARKS_POINTS)
                || facetType.equals(FacetTypes.STATIC_WQKMS)
                || facetType.equals(FacetTypes.STATIC_WQKMS_W)
                || facetType.equals(FacetTypes.DISCHARGE_LONGITUDINAL_W))
        {
            return true;
        }
        return false;
    }

    /**
     * This method determines - taking JFreeCharts auto x value ordering into
     * account - if the x axis need to be inverted. Waterlines in these charts
     * should decrease.
     *
     * @param wkms The data object that stores the x and y values used for this
     * chart.
     */
    public void invertAxis(XYChartGenerator generator, WKms wkms) {
        boolean wsUp = wkms.guessWaterIncreasing();
        boolean kmUp = DataUtil.guessWaterIncreasing(wkms.allKms());
        boolean inv = (wsUp && kmUp) || (!wsUp && !kmUp);

        int size = wkms.size();

        if (logger.isDebugEnabled()) {
            logger.debug("(Wkms)Values  : " + size);
            if (size > 0) {
                logger.debug("Start km: " + wkms.getKm(0));
                logger.debug("End   km: " + wkms.getKm(size-1));
            }
            logger.debug("wsUp: " + wsUp);
            logger.debug("kmUp: " + kmUp);
            logger.debug("inv:  " + inv);
        }
        generator.setInverted(inv);
    }
}
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