/* 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.sq;

import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.HashMap;
import java.util.Date;
import java.util.Locale;
import java.text.DateFormat;

import org.w3c.dom.Document;

import net.sf.jasperreports.engine.JasperExportManager;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.JRException;

import au.com.bytecode.opencsv.CSVWriter;

import org.dive4elements.artifacts.CallContext;
import org.dive4elements.artifacts.CallMeta;

import org.dive4elements.river.artifacts.model.CalculationResult;
import org.dive4elements.river.artifacts.model.sq.SQFractionResult;
import org.dive4elements.river.artifacts.model.sq.SQResult;
import org.dive4elements.river.artifacts.model.sq.SQRelationJRDataSource;
import org.dive4elements.river.artifacts.model.Parameters;
import org.dive4elements.river.artifacts.model.DateRange;
import org.dive4elements.river.artifacts.access.SQRelationAccess;

import org.dive4elements.river.artifacts.resources.Resources;

import org.dive4elements.river.artifacts.D4EArtifact;

import org.dive4elements.river.exports.AbstractExporter;

import org.dive4elements.river.utils.RiverUtils;
import org.dive4elements.river.utils.Formatter;

import org.dive4elements.artifacts.common.utils.Config;

import org.apache.log4j.Logger;

/**
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class SQRelationExporter extends AbstractExporter {

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


    public static final String CSV_PARAMETER =
        "export.sqrelation.csv.header.parameter";

    public static final String CSV_STATION =
        "export.sqrelation.csv.header.station";

    public static final String CSV_KM =
        "export.sqrelation.csv.header.km";

    public static final String CSV_FUNCTION =
        "export.sqrelation.csv.header.function";

    public static final String CSV_GAUGE =
        "export.sqrelation.csv.header.gauge";

    public static final String CSV_COEFF_A =
        "export.sqrelation.csv.header.coeff.a";

    public static final String CSV_COEFF_B =
        "export.sqrelation.csv.header.coeff.b";

    public static final String CSV_COEFF_Q =
        "export.sqrelation.csv.header.coeff.q";

    public static final String CSV_COEFF_R =
        "export.sqrelation.csv.header.coeff.r";

    public static final String CSV_N_TOTAL =
        "export.sqrelation.csv.header.n.total";

    public static final String CSV_N_OUTLIERS =
        "export.sqrelation.csv.header.n.outliers";

    public static final String CSV_C_DUAN =
        "export.sqrelation.csv.header.c.duan";

    public static final String CSV_C_FERGUSON =
        "export.sqrelation.csv.header.c.ferguson";

    public static final String CSV_VARIANCE =
        "export.sqrelation.csv.header.variance";

    public static final String PDF_TITLE=
        "export.sqrelation.pdf.title";

    public static final String PDF_HEADER_MODE =
        "export.sqrelation.pdf.mode";

    public static final String JASPER_FILE =
        "export.sqrelation.pdf.file";

    protected List<SQResult []> data;


    public void init(Document request, OutputStream out, CallContext cc) {
        super.init(request, out, cc);
        data = new ArrayList<SQResult []>();
    }


    @Override
    protected void addData(Object d) {
        if (d instanceof CalculationResult) {
            d = ((CalculationResult)d).getData();
            if (d instanceof SQResult []) {
                data.add((SQResult [])d);
            }
        }
    }

    protected void writeCSVHeader(CSVWriter writer) {
        writer.writeNext(new String[] {
            msg(CSV_KM        , CSV_KM),
            msg(CSV_PARAMETER,  CSV_PARAMETER),
            msg(CSV_COEFF_A   , CSV_COEFF_A),
            msg(CSV_COEFF_B   , CSV_COEFF_B),
            msg(CSV_N_TOTAL   , CSV_N_TOTAL),
            msg(CSV_N_OUTLIERS, CSV_N_OUTLIERS),
            msg(CSV_VARIANCE  , CSV_VARIANCE)
        });
    }

    @Override
    protected void writeCSVData(CSVWriter writer) {
        logger.debug("writeCSVData");

        writeCSVHeader(writer);

        for (SQResult [] results: data) {
            for (SQResult result: results) {
                writer.writeAll(data2StringArrays(result));
            }
        }
    }

    protected List<String[]> data2StringArrays(SQResult result) {
        String km = Formatter.getSQRelationKM(context
                    ).format(result.getKm());
        List<String[]> retval = new ArrayList<String[]>();

        for (int i = 0; i < SQResult.NUMBER_FRACTIONS; ++i) {
            SQFractionResult fraction = result.getFraction(i);

            String name = result.getFractionName(i);

            Parameters parameters = fraction.getParameters();

            if (parameters == null) {
                continue;
            }

            String a, b, sd, o, t;
            a  = Formatter.getSQRelationA(context).format(parameters.getValue(0, "a"));
            b  = Formatter.getSQRelationB(context).format(parameters.getValue(0, "b"));
            sd = Formatter.getVariance(context).format(Math.sqrt(parameters.getValue(0, "std_dev")));

            o  = String.valueOf(fraction.totalNumOutliers());
            t  = String.valueOf(fraction.numMeasurements() + o);

            retval.add(new String[] {
                km,
                name,
                a,
                b,
                t,
                o,
                sd
            });
        }
        return retval;
    }


    protected SQRelationJRDataSource createJRData() {
        SQRelationJRDataSource source = new SQRelationJRDataSource();

        addMetaData(source);
        for (SQResult [] results: data) {
            for (SQResult result: results) {
                for (String[] res: data2StringArrays(result)) {
                    source.addData(res);
                }
            }
        }
        return source;
    }

    protected void addMetaData(SQRelationJRDataSource source) {
        CallMeta meta = context.getMeta();

        D4EArtifact arti = (D4EArtifact) master;

        source.addMetaData ("river", RiverUtils.getRivername(arti));

        Locale locale = Resources.getLocale(meta);
        DateFormat df = DateFormat.getDateInstance(DateFormat.SHORT, locale);

        source.addMetaData("date", df.format(new Date()));

        SQRelationAccess access = new SQRelationAccess(arti);
        source.addMetaData("location", "KM " + getKmFormatter().format(access.getLocation()));

        DateRange period = access.getPeriod();
        source.addMetaData("periods", df.format(period.getFrom()) + " - " +
            df.format(period.getTo()));

        source.addMetaData("outliertest", Resources.getMsg(meta,
                    access.getOutlierMethod(),
                    access.getOutlierMethod()));
        source.addMetaData("outliers", access.getOutliers().toString());

        source.addMetaData("calculation", Resources.getMsg(
                                            locale,
                                            PDF_HEADER_MODE,
                                            "SQRelation"));
    }

    @Override
    protected void writePDF(OutputStream out) {
        logger.debug("write PDF");
        SQRelationJRDataSource source = createJRData();

        String jasperFile = Resources.getMsg(
                                context.getMeta(),
                                JASPER_FILE,
                                "/jasper/sqrelation_en.jasper");
        String confPath = Config.getConfigDirectory().toString();


        Map parameters = new HashMap();
        parameters.put("ReportTitle", Resources.getMsg(
                    context.getMeta(), PDF_TITLE, "Exported Data"));
        try {
            JasperPrint print = JasperFillManager.fillReport(
                confPath + jasperFile,
                parameters,
                source);
            JasperExportManager.exportReportToPdfStream(print, out);
        }
        catch(JRException je) {
            logger.warn("Error generating PDF Report!", je);
        }
    }
}
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