/* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
 * Software engineering by Intevation GmbH
 *
 * 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.exports;

import org.apache.log4j.Logger;
import org.dive4elements.artifactdatabase.state.ArtifactAndFacet;
import org.dive4elements.artifactdatabase.state.Facet;
import org.dive4elements.artifacts.CallContext;
import org.dive4elements.river.artifacts.D4EArtifact;
import org.dive4elements.river.artifacts.geom.Lines;
import org.dive4elements.river.artifacts.model.AreaFacet;
import org.dive4elements.river.artifacts.model.FacetTypes;
import org.dive4elements.river.artifacts.model.WKms;
import org.dive4elements.river.artifacts.model.WQKms;
import org.dive4elements.river.exports.process.AnnotationProcessor;
import org.dive4elements.river.exports.process.BedDiffHeightYearProcessor;
import org.dive4elements.river.exports.process.BedDiffYearProcessor;
import org.dive4elements.river.exports.process.Processor;
import org.dive4elements.river.exports.process.QOutProcessor;
import org.dive4elements.river.exports.process.WOutProcessor;
import org.dive4elements.river.jfree.StyledAreaSeriesCollection;
import org.dive4elements.river.jfree.StyledXYSeries;
import org.dive4elements.river.themes.ThemeDocument;
import org.dive4elements.river.utils.RiverUtils;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.xy.XYSeries;

/**
 * An OutGenerator that generates longitudinal section curves.
 *
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class LongitudinalSectionGenerator extends XYChartGenerator implements FacetTypes {
    public enum YAXIS {
        W(0), D(1), Q(2);
        protected int idx;

        private YAXIS(final int c) {
            this.idx = c;
        }
    }

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

    /** Key to look up internationalized String for annotations label. */
    public static final String I18N_ANNOTATIONS_LABEL = "chart.longitudinal.annotations.label";

    /**
     * Key to look up internationalized String for LongitudinalSection diagrams
     * titles.
     */
    public static final String I18N_CHART_TITLE = "chart.longitudinal.section.title";

    /**
     * Key to look up internationalized String for LongitudinalSection diagrams
     * subtitles.
     */
    public static final String I18N_CHART_SUBTITLE = "chart.longitudinal.section.subtitle";

    /**
     * Key to look up internationalized String for LongitudinalSection diagrams
     * short subtitles.
     */
    public static final String I18N_CHART_SHORT_SUBTITLE = "chart.longitudinal.section.shortsubtitle";

    public static final String I18N_XAXIS_LABEL = "chart.longitudinal.section.xaxis.label";

    public static final String I18N_YAXIS_LABEL = "chart.longitudinal.section.yaxis.label";

    public static final String I18N_2YAXIS_LABEL = "common.export.csv.header.q";

    public static final String I18N_CHART_TITLE_DEFAULT = "W-L\u00e4ngsschnitt";
    public static final String I18N_XAXIS_LABEL_DEFAULT = "km";
    public static final String I18N_YAXIS_LABEL_DEFAULT = "W [NN + m]";
    public static final String I18N_2YAXIS_LABEL_DEFAULT = "Q [m\u00b3/s]";

    public final static String I18N_WDIFF_YAXIS_LABEL = "chart.w_differences.yaxis.label";

    public final static String I18N_WDIFF_YAXIS_LABEL_DEFAULT = "m";

    public LongitudinalSectionGenerator() {
        super();
    }

    @Override
    protected YAxisWalker getYAxisWalker() {
        return new YAxisWalker() {
            @Override
            public int length() {
                return YAXIS.values().length;
            }

            @Override
            public String getId(final int idx) {
                final YAXIS[] yaxes = YAXIS.values();
                return yaxes[idx].toString();
            }
        };
    }

    /**
     * Return left most data points x value (on first axis).
     * Overridden because axis could be inverted.
     */
    @Override
    protected double getLeftX() {
        if (isInverted()) {
            return (Double) getXBounds(0).getUpper();
        }
        return (Double) getXBounds(0).getLower();
    }

    /**
     * Return right most data points x value (on first axis).
     * Overridden because axis could be inverted.
     */
    @Override
    protected double getRightX() {
        if (isInverted()) {
            return (Double) getXBounds(0).getLower();
        }
        return (Double) getXBounds(0).getUpper();
    }

    /**
     * Returns the default title for this chart.
     *
     * @return the default title for this chart.
     */
    @Override
    public String getDefaultChartTitle(final CallContext context) {
        return msg(I18N_CHART_TITLE, I18N_CHART_TITLE_DEFAULT);
    }

    /**
     * Returns the default subtitle for this chart.
     *
     * @return the default subtitle for this chart.
     */
    @Override
    protected String getDefaultChartSubtitle(final CallContext context) {
        final double[] dist = getRange();

        Object[] args = null;
        if (dist == null) {
            args = new Object[] { getRiverName() };
            return msg(getChartShortSubtitleKey(), "", args);
        }
        args = new Object[] { getRiverName(), dist[0], dist[1] };
        return msg(getChartSubtitleKey(), "", args);
    }

    /**
     * Gets key to look up internationalized String for the charts subtitle.
     * 
     * @return key to look up translated subtitle.
     */
    protected String getChartSubtitleKey() {
        return I18N_CHART_SUBTITLE;
    }

    /**
     * Gets key to look up internationalized String for the charts short
     * subtitle.
     * 
     * @return key to look up translated subtitle.
     */
    protected String getChartShortSubtitleKey() {
        return I18N_CHART_SHORT_SUBTITLE;
    }

    /**
     * Get internationalized label for the x axis.
     */
    @Override
    protected String getDefaultXAxisLabel(final CallContext context) {
        final D4EArtifact flys = getArtifact();

        return msg(I18N_XAXIS_LABEL, I18N_XAXIS_LABEL_DEFAULT, new Object[] { RiverUtils.getRiver(flys).getName() });
    }

    @Override
    protected String getDefaultYAxisLabel(final int index) {
        String label = "default";

        if (index == YAXIS.W.idx) {
            label = getWAxisLabel();
        } else if (index == YAXIS.Q.idx) {
            label = msg(getQAxisLabelKey(), getQAxisDefaultLabel());
        } else if (index == YAXIS.D.idx) {
            label = msg(I18N_WDIFF_YAXIS_LABEL, I18N_WDIFF_YAXIS_LABEL_DEFAULT);
        }

        return label;
    }

    /**
     * Get internationalized label for the y axis.
     */
    protected String getWAxisLabel() {
        final D4EArtifact flys = getArtifact();

        final String unit = RiverUtils.getRiver(flys).getWstUnit().getName();

        return msg(I18N_YAXIS_LABEL, I18N_YAXIS_LABEL_DEFAULT, new Object[] { unit });
    }

    /**
     * Create Axis for given index.
     * 
     * @return axis with according internationalized label.
     */
    @Override
    protected NumberAxis createYAxis(final int index) {
        final NumberAxis axis = super.createYAxis(index);

        // "Q" Axis shall include 0.
        if (index == YAXIS.Q.idx) {
            axis.setAutoRangeIncludesZero(true);
        } else {
            axis.setAutoRangeIncludesZero(false);
        }

        return axis;
    }

    /**
     * Get default value for the second Y-Axis' label (if no translation was
     * found).
     */
    protected String getQAxisDefaultLabel() {
        return I18N_2YAXIS_LABEL_DEFAULT;
    }

    /**
     * Get key for internationalization of the second Y-Axis' label.
     */
    protected String getQAxisLabelKey() {
        return I18N_2YAXIS_LABEL;
    }

    /**
     * Trigger inversion.
     */
    @Override
    protected void adjustAxes(final XYPlot plot) {
        super.adjustAxes(plot);
        invertXAxis(plot.getDomainAxis());
    }

    /**
     * This method inverts the x-axis based on the kilometer information of the
     * selected river. If the head of the river is at kilometer 0, the axis is
     * not inverted, otherwise it is.
     *
     * @param xaxis
     *            The domain axis.
     */
    protected void invertXAxis(final ValueAxis xaxis) {
        if (isInverted()) {
            log.debug("X-Axis.setInverted(true)");
            xaxis.setInverted(true);
        }
    }

    /**
     * Produce output.
     * 
     * @param artifactAndFacet
     *            current facet and artifact.
     * @param attr
     *            theme for facet
     */
    @Override
    public void doOut(final ArtifactAndFacet artifactAndFacet, final ThemeDocument attr, final boolean visible) {
        final String name = artifactAndFacet.getFacetName();

        log.debug("LongitudinalSectionGenerator.doOut: " + name);

        if (name == null) {
            log.error("No facet name for doOut(). No output generated!");
            return;
        }

        final Facet facet = artifactAndFacet.getFacet();

        if (facet == null) {
            return;
        }

        final CallContext context = getContext();

        final Processor wProcessor = new WOutProcessor();
        final Processor qProcessor = new QOutProcessor();
        final Processor bdyProcessor = new BedDiffYearProcessor();
        final Processor bdhyProcessor = new BedDiffHeightYearProcessor();
        final Processor annotationProcessor = new AnnotationProcessor();

        if (wProcessor.canHandle(name)) {
            wProcessor.doOut(this, artifactAndFacet, attr, visible, YAXIS.W.idx);
        }
        if (qProcessor.canHandle(name)) {
            qProcessor.doOut(this, artifactAndFacet, attr, visible, YAXIS.Q.idx);
        } else if (bdyProcessor.canHandle(name)) {
            bdyProcessor.doOut(this, artifactAndFacet, attr, visible, YAXIS.W.idx);
        } else if (bdhyProcessor.canHandle(name)) {
            bdhyProcessor.doOut(this, artifactAndFacet, attr, visible, YAXIS.W.idx);
        } else if (annotationProcessor.canHandle(name)) {
            annotationProcessor.doOut(this, artifactAndFacet, attr, visible, 0);
        } else if (name.equals(W_DIFFERENCES)) {
            doWDifferencesOut((WKms) artifactAndFacet.getData(context), artifactAndFacet, attr, visible);
        } else if (FacetTypes.IS.AREA(name)) {
            doArea(artifactAndFacet.getData(context), artifactAndFacet, attr, visible);
        } else if (FacetTypes.IS.MANUALPOINTS(name)) {
            doPoints(artifactAndFacet.getData(context), artifactAndFacet, attr, visible, YAXIS.W.idx);
        } else {
            log.warn("Unknown facet name: " + name);
            return;
        }
    }

    /**
     * Add items to dataseries which describes the differences.
     */
    protected void doWDifferencesOut(final WKms wkms, final ArtifactAndFacet aandf, final ThemeDocument theme, final boolean visible) {
        log.debug("WDifferencesCurveGenerator.doWDifferencesOut");
        if (wkms == null) {
            log.warn("No data to add to WDifferencesChart.");
            return;
        }

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

        if (log.isDebugEnabled()) {
            if (wkms.size() > 0) {
                log.debug("Generate series: " + series.getKey());
                log.debug("Start km: " + wkms.getKm(0));
                log.debug("End   km: " + wkms.getKm(wkms.size() - 1));
                log.debug("Values  : " + wkms.size());
            }
        }

        StyledSeriesBuilder.addPoints(series, wkms);

        addAxisSeries(series, YAXIS.D.idx, visible);
    }

    /**
     * Get name of series (displayed in legend).
     * 
     * @return name of the series.
     */
    protected String getSeriesName(final WQKms wqkms, final String mode) {
        final String name = wqkms.getName();
        final String prefix = name != null && name.indexOf(mode) >= 0 ? null : mode;

        return prefix != null && prefix.length() > 0 ? prefix + "(" + name + ")" : name;
    }

    /** Look up the axis identifier for a given facet type. */
    public int axisIdxForFacet(final String facetName) {
        if (FacetTypes.IS.W(facetName)) {
            return YAXIS.W.idx;
        } else if (FacetTypes.IS.Q(facetName)) {
            return YAXIS.Q.idx;
        } else {
            log.warn("Could not find axis for facet " + facetName);
            return YAXIS.W.idx;
        }
    }

    /**
     * Do Area out.
     * 
     * @param theme
     *            styling information.
     * @param visible
     *            whether or not visible.
     */
    protected void doArea(final Object o, final ArtifactAndFacet aandf, final ThemeDocument theme, final boolean visible) {
        log.debug("LongitudinalSectionGenerator.doArea");
        final StyledAreaSeriesCollection area = new StyledAreaSeriesCollection(theme);

        final String seriesName = aandf.getFacetDescription();

        final AreaFacet.Data data = (AreaFacet.Data) o;

        XYSeries up = null;
        XYSeries down = null;

        if (data.getUpperData() != null) {
            up = new StyledXYSeries(seriesName, false, theme);
            if (data.getUpperData() instanceof WQKms) {
                if (FacetTypes.IS.Q(data.getUpperFacetName())) {
                    StyledSeriesBuilder.addPointsKmQ(up, (WQKms) data.getUpperData());
                } else {
                    StyledSeriesBuilder.addPoints(up, (WKms) data.getUpperData());
                }
            } else if (data.getUpperData() instanceof double[][]) {
                StyledSeriesBuilder.addPoints(up, (double[][]) data.getUpperData(), false);
            } else if (data.getUpperData() instanceof WKms) {
                StyledSeriesBuilder.addPoints(up, (WKms) data.getUpperData());
            } else if (data.getUpperData() instanceof Lines.LineData) {
                StyledSeriesBuilder.addPoints(up, ((Lines.LineData) data.getUpperData()).points, false);
            } else {
                log.error("Do not know how to deal with (up) area info from: " + data.getUpperData());
            }
        }

        // TODO Depending on style, the area (e.g. 20m^2)
        // should be added as annotation.

        if (data.getLowerData() != null) {
            // TODO: Sort this out: when the two series have the same name,
            // the renderer (or anything in between) will not work correctly.
            down = new StyledXYSeries(seriesName + " ", false, theme);
            if (data.getLowerData() instanceof WQKms) {
                if (FacetTypes.IS.Q(data.getLowerFacetName())) {
                    StyledSeriesBuilder.addPointsKmQ(down, (WQKms) data.getLowerData());
                } else {
                    StyledSeriesBuilder.addPoints(down, (WQKms) data.getLowerData());
                }
            } else if (data.getLowerData() instanceof double[][]) {
                StyledSeriesBuilder.addPoints(down, (double[][]) data.getLowerData(), false);
            } else if (data.getLowerData() instanceof WKms) {
                StyledSeriesBuilder.addPoints(down, (WKms) data.getLowerData());
            } else if (data.getLowerData() instanceof Lines.LineData) {
                StyledSeriesBuilder.addPoints(down, ((Lines.LineData) data.getLowerData()).points, false);
            } else {
                log.error("Do not know how to deal with (down) area info from: " + data.getLowerData());
            }
        }

        if (up == null && down != null) {
            area.setMode(StyledAreaSeriesCollection.FILL_MODE.ABOVE);
            down.setKey(seriesName);
            area.addSeries(down);
            area.addSeries(StyledSeriesBuilder.createGroundAtInfinity(down));
        } else if (up != null && down == null) {
            area.setMode(StyledAreaSeriesCollection.FILL_MODE.UNDER);
            area.addSeries(up);
            area.addSeries(StyledSeriesBuilder.createGroundAtInfinity(up));
        } else if (up != null && down != null) {
            if (data.doPaintBetween()) {
                area.setMode(StyledAreaSeriesCollection.FILL_MODE.BETWEEN);
            } else {
                area.setMode(StyledAreaSeriesCollection.FILL_MODE.ABOVE);
            }
            area.addSeries(up);
            area.addSeries(down);
        }
        // Add area to the respective axis.
        final String facetAxisName = data.getUpperFacetName() == null ? data.getLowerFacetName() : data.getUpperFacetName();
        addAreaSeries(area, axisIdxForFacet(facetAxisName), visible);
    }
}
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