/**
 *
 */
package de.intevation.gnv.transition.timeseries;

import java.awt.Color;
import java.awt.Dimension;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.util.Collection;
import java.util.Iterator;

import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerFactoryConfigurationError;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.apache.log4j.Logger;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

import au.com.bytecode.opencsv.CSVWriter;
import de.intevation.artifactdatabase.Config;
import de.intevation.artifactdatabase.XMLUtils;
import de.intevation.artifacts.CallMeta;
import de.intevation.gnv.chart.ChartFactory;
import de.intevation.gnv.chart.ChartLabels;
import de.intevation.gnv.chart.ChartStyle;
import de.intevation.gnv.chart.exception.TechnicalChartException;
import de.intevation.gnv.geobackend.base.Result;
import de.intevation.gnv.statistics.Statistic;
import de.intevation.gnv.statistics.Statistics;
import de.intevation.gnv.statistics.TimeseriesStatistics;
import de.intevation.gnv.statistics.exception.StatisticsException;
import de.intevation.gnv.transition.InputData;
import de.intevation.gnv.transition.OutputTransitionBase;
import de.intevation.gnv.transition.describedata.KeyValueDescibeData;
import de.intevation.gnv.transition.describedata.NamedCollection;
import de.intevation.gnv.transition.exception.TransitionException;
import de.intevation.gnv.utils.ArtifactXMLUtilities;

/**
 * @author Tim Englich <tim.englich@intevation.de>
 * 
 */
public class TimeSeriesOutputTransition extends OutputTransitionBase {

    /**
     * The UID of this Class
     */
    private static final long serialVersionUID = 4178407570503098858L;

    /**
     * the logger, used to log exceptions and additonaly information
     */
    private static Logger log = Logger
            .getLogger(TimeSeriesOutputTransition.class);

    protected String domainLable = "Zeit [UTC]";
    
    protected String featureValuesName = "featureid";
    protected String parameterValuesName = "parameterid";
    protected String measuremenValueName = "measurementid";

    /**
     * Constructor
     */
    public TimeSeriesOutputTransition() {
        super();
    }

    /**
     * @see de.intevation.gnv.transition.Transition#validate()
     */
    public boolean validate() {
        return true;
    }

    /**
     * @see de.intevation.gnv.transition.OutputTransition#out(java.lang.String,
     *      java.util.Collection, java.io.OutputStream, java.lang.String,
     *      de.intevation.artifacts.CallMeta)
     */
    public void out(String outputMode, Collection<InputData> inputData,
                    OutputStream outputStream, String uuid, CallMeta callMeta)
                                                                              throws TransitionException {
        log.debug("TimeSeriesOutputTransition.out");
        try {

            this.advance(uuid, callMeta);
            Collection<Result> chartResult = this.getChartResult(uuid);
            if (outputMode.equalsIgnoreCase("chart")) {
                log.debug("Chart will be generated.");
                int chartWidth = 600;
                int chartHeight = 400;
                try {
                    if (inputData != null) {
                        Iterator<InputData> it = inputData.iterator();
                        while (it.hasNext()) {
                            InputData ip = it.next();
                            if (ip.getName().equalsIgnoreCase("width")) {
                                chartWidth = Integer.parseInt(ip.getValue());
                            } else if (ip.getName().equalsIgnoreCase("height")) {
                                chartHeight = Integer.parseInt(ip.getValue());
                            }
                        }
                    }
                } catch (NumberFormatException e) {
                    log.error(e, e);
                    throw new TransitionException(e);
                }
                Collection<KeyValueDescibeData> parameters = this
                        .getParameters();
                Collection<KeyValueDescibeData> measurements = this
                        .getMeasurements();
                ChartStyle chartStyle = this
                        .creatStyle(chartWidth, chartHeight);
                ChartLabels chartLables = new ChartLabels(this
                        .getSelectedFeatureName(), this.domainLable);
                this.createChart(outputStream, parameters, measurements,
                        chartStyle, chartLables, uuid);
            } else if (outputMode.equalsIgnoreCase("csv")) {
                log.debug("CSV-File will be generated.");
                if (chartResult != null) {
                    CSVWriter writer = new CSVWriter(new OutputStreamWriter(
                            outputStream, "ISO-8859-1"), ','); // USE THIS
                                                               // ENCODING
                                                               // BECAUSE OF
                                                               // PROBLEMS WITH
                                                               // EXCEL AND
                                                               // UTF-8
                    Iterator<Result> it = chartResult.iterator();
                    while (it.hasNext()) {
                        Result result = it.next();
                        int i = 0;
                        String[] entries = new String[5];
                        entries[i++] = result.getString("XORDINATE");
                        entries[i++] = result.getString("YORDINATE");
                        entries[i++] = result.getString("GROUP1");
                        entries[i++] = result.getString("GROUP2");
                        entries[i++] = result.getString("GROUP3");
                        writer.writeNext(entries);
                    }
                    writer.close();
                } else {
                    log.error("No Data given for generation an CSV-File.");
                    throw new TransitionException(
                            "No Data given for generation an CSV-File.");
                }
            } else if (outputMode.equalsIgnoreCase("statistics")) {
                log.debug("Statistics will be generated.");
                Statistics s = getStatisticsGenerator();
                Collection<Statistic> statistics = s
                        .calculateStatistics(chartResult);
                Document doc = this.writeStatistics2XML(statistics);
                this.writeDocument2OutputStream(doc, outputStream);
            }
        } catch (IOException e) {
            log.error(e, e);
            throw new TransitionException(e);
        } catch (TechnicalChartException e) {
            log.error(e, e);
            throw new TransitionException(e);
        } catch (StatisticsException e) {
            log.error(e, e);
            throw new TransitionException(e);
        }
    }

    /**
     * @return
     */
    protected Statistics getStatisticsGenerator() {
        Statistics s = new TimeseriesStatistics();
        return s;
    }

    protected void writeDocument2OutputStream(Document document, OutputStream os) {

        try {
            TransformerFactory transformerFactory = TransformerFactory
                    .newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            DOMSource source = new DOMSource(document);
            StreamResult result = new StreamResult(os);
            transformer.transform(source, result);
        } catch (TransformerConfigurationException e) {
            log.error(e, e);
        } catch (TransformerFactoryConfigurationError e) {
            log.error(e, e);
        } catch (TransformerException e) {
            log.error(e, e);
        }
    }

    protected Document writeStatistics2XML(Collection<Statistic> statistic) {
        ArtifactXMLUtilities xmlUtilities = new ArtifactXMLUtilities();
        Document doc = XMLUtils.newDocument();
        if (statistic != null) {
            Node statisticResults = xmlUtilities.createArtifactElement(doc,
                    "statistic-values");
            doc.appendChild(statisticResults);
            Iterator<Statistic> it = statistic.iterator();
            while (it.hasNext()) {
                Statistic s = it.next();
                Element result = xmlUtilities.createArtifactElement(doc,
                        "statistic");
                result.setAttribute("name", s.getKey());
                result.setAttribute("value", s.getStringValue());
                statisticResults.appendChild(result);
            }

        }
        return doc;
    }

    protected String getSelectedFeatureName() {
        Collection<KeyValueDescibeData> values = this
                .getCollection(featureValuesName);
        if (values != null) {
            Iterator<KeyValueDescibeData> it = values.iterator();
            while (it.hasNext()) {
                KeyValueDescibeData data = it.next();
                if (data.isSelected()) {
                    return data.getValue();
                }
            }
        }
        return null;
    }

    /**
     * @param outputStream
     * @param parameters
     * @param measurements
     * @param timeSeriesName
     * @param chartStyle
     * @param chartLables
     * @throws IOException
     * @throws TechnicalChartException
     */
    protected void createChart(OutputStream outputStream,
                               Collection<KeyValueDescibeData> parameters,
                               Collection<KeyValueDescibeData> measurements,
                               ChartStyle chartStyle, ChartLabels chartLables,
                               String uuid) throws IOException,
                                           TechnicalChartException {
        ChartFactory chartFactory = new ChartFactory();
        chartFactory.createSimpleTimeSeriesChart(chartLables, chartStyle,
                parameters, measurements, outputStream, this
                        .getChartResult(uuid));
    }

    protected ChartStyle creatStyle(int witdh, int height) {
        // TODO Konfigurierbar machen
        de.intevation.gnv.chart.Insets lInsets = new de.intevation.gnv.chart.Insets(
                5d, 5d, 5d, 5d);
        Dimension lChartSize = new Dimension(witdh, height);
        return new ChartStyle(Color.white, new Color(230, 230, 230),
                Color.white, Color.white, true, true, lInsets, lChartSize);
    }

    protected Collection<KeyValueDescibeData> getParameters() {
        return this.getCollection(parameterValuesName);
    }

    protected Collection<KeyValueDescibeData> getMeasurements() {
        return this.getCollection(measuremenValueName);
    }

    @Override
    public void setup(Node configuration) {
        super.setup(configuration);
        String featureNameValue = Config.getStringXPath(configuration, "value-names/value-name[@name='feature']/@value");
        if (featureNameValue != null){
            this.featureValuesName = featureNameValue;
        }
        String parameterNameValue = Config.getStringXPath(configuration, "value-names/value-name[@name='parameter']/@value");
        if (parameterNameValue != null){
            this.parameterValuesName = parameterNameValue;
        }
        String measurementNameValue = Config.getStringXPath(configuration, "value-names/value-name[@name='measurement']/@value");
        if (measurementNameValue != null){
            this.measuremenValueName = measurementNameValue;
        }
    }

    /**
     * @param collectionName
     * @return
     */
    protected Collection<KeyValueDescibeData> getCollection(
                                                            String collectionName) {
        Iterator<Object> it = this.descibeData.iterator();
        while (it.hasNext()) {

            Object o = it.next();

            if (o instanceof NamedCollection<?>) {
                NamedCollection<KeyValueDescibeData> nc = (NamedCollection<KeyValueDescibeData>) o;
                if (nc.getName().equals(collectionName)) {
                    return nc;
                }
            }
        }
        return null;
    }
}