/* Copyright (C) 2017 by Bundesanstalt für Gewässerkunde
 * Software engineering by
 *  Björnsen Beratende Ingenieure GmbH
 *  Dr. Schumacher Ingenieurbüro für Wasser und Umwelt
 *
 * This file is Free Software under the GNU AGPL (>=v3)
 * and comes with ABSOLUTELY NO WARRANTY! Check out the
 * documentation coming with Dive4Elements River for details.
 */

package org.dive4elements.river.artifacts.sinfo.common;

import java.util.Map;
import java.util.Set;

import org.dive4elements.artifactdatabase.state.ArtifactAndFacet;
import org.dive4elements.artifacts.Artifact;
import org.dive4elements.artifacts.CallContext;
import org.dive4elements.river.artifacts.D4EArtifact;
import org.dive4elements.river.artifacts.access.RiverAccess;
import org.dive4elements.river.artifacts.context.RiverContext;
import org.dive4elements.river.artifacts.math.MovingAverage;
import org.dive4elements.river.artifacts.model.ZoomScale;
import org.dive4elements.river.exports.DiagramGenerator;
import org.dive4elements.river.exports.StyledSeriesBuilder;
import org.dive4elements.river.jfree.StyledXYSeries;
import org.dive4elements.river.themes.ThemeDocument;

abstract class AbstractSInfoLineProcessor<RESULT extends AbstractSInfoCalculationResult> extends AbstractSInfoProcessor {

    public AbstractSInfoLineProcessor(final String i18nAxisLabel, final Set<String> handledFacetType) {
        super(i18nAxisLabel, handledFacetType);
    }

    @Override
    protected final String generateSeries(final DiagramGenerator generator, final ArtifactAndFacet bundle, final ThemeDocument theme, final boolean visible) {

        final CallContext context = generator.getCallContext();
        final Map<String, String> metaData = bundle.getFacet().getMetaData();

        final Artifact artifact = bundle.getArtifact();

        final StyledXYSeries series = new StyledXYSeries(bundle.getFacetDescription(), theme);
        series.putMetaData(metaData, artifact, context);

        final String facetName = bundle.getFacetName();
        @SuppressWarnings("unchecked")
        final RESULT data = (RESULT) bundle.getData(context);
        if (data == null) {
            // Check has been here before so we keep it for security reasons
            // this should never happen though.
            throw new IllegalStateException("Data is null for facet: " + facetName);
        }

        final double[][] points = generatePoints(context, artifact, data, facetName);

        StyledSeriesBuilder.addPoints(series, points, true);
        generator.addAxisSeries(series, getAxisName(), visible);

        return metaData.get("Y");
    }

    private Double findRadius(final CallContext context, final Artifact artifact) {
        final Double start = (Double) context.getContextValue("startkm");
        final Double end = (Double) context.getContextValue("endkm");

        if (start == null || end == null)
            return null;

        final RiverContext fc = (RiverContext) context.globalContext();
        final ZoomScale scales = (ZoomScale) fc.get("zoomscale");
        final RiverAccess access = new RiverAccess((D4EArtifact) artifact);
        final String river = access.getRiverName();

        return scales.getRadius(river, start, end);
    }

    private double[][] generatePoints(final CallContext context, final Artifact artifact, final RESULT data,
            final String facetName) {

        final double[][] points = doGetPoints(data, facetName);
        if( facetName.endsWith(".filtered"))
        {
            final Double radius = findRadius(context, artifact);
            return movingAverage(radius, points);
        }

        return points;
    }

    protected abstract double[][] doGetPoints(RESULT data, String facetName);

    private double[][] movingAverage(final Double radius, final double[][] points) {

        if (radius == null)
            return points;

        return MovingAverage.weighted(points, radius);
    }
}