package de.intevation.flys.artifacts;

import java.util.ArrayList;
import java.util.List;

import org.apache.log4j.Logger;

import org.w3c.dom.Document;

import de.intevation.artifacts.Artifact;
import de.intevation.artifacts.ArtifactFactory;
import de.intevation.artifacts.CallMeta;

import de.intevation.artifacts.common.ArtifactNamespaceContext;
import de.intevation.artifacts.common.utils.XMLUtils;

import de.intevation.flys.artifacts.states.DefaultState;

import de.intevation.artifactdatabase.state.Facet;


/**
 * Artifact describing the area between two WKms.
 */
public class HYKArtifact extends StaticFLYSArtifact {

    /** Access ids of doc. */
    public static final String XPATH_IDS = "/art:action/art:ids/@value";

    /** Name of Artifact. */
    public static final String HYK_ARTIFACT_NAME = "hyk";

    /** Name of data item keeping the km of cs master. */
    public static final String HYK_KM = "hyk_artifact.data.km";

    /** Own logger. */
    private static final Logger logger =
        Logger.getLogger(HYKArtifact.class);


    /** Return given name. */
    @Override
    public String getName() {
        return HYK_ARTIFACT_NAME;
    }


    /** Store ids, do super.setup. */
    @Override
    public void setup(
        String          identifier,
        ArtifactFactory factory,
        Object          context,
        CallMeta        callMeta,
        Document        data)
    {
        logger.info("HYKArtifact.setup");

        super.setup(identifier, factory, context, callMeta, data);

        String ids = XMLUtils.xpathString(
            data, XPATH_IDS, ArtifactNamespaceContext.INSTANCE);

        addStringData("ids", ids);
    }


    /** Set km as Data. */
    public void setKm(double km) {
        addStringData(HYK_KM, Double.toString(km));
    }


    /**
     * Get a DataItem casted to double (0 if fails).
     * TODO move to FlysArtifact.
     */
    public double getDataAsDouble(String dataName) {
        String val = getDataAsString(dataName);
        if (val == null) {
            logger.warn("Data not available.");
            return 0d;
        }
        try {
            return Double.valueOf(val);
        }
        catch (NumberFormatException e) {
            logger.warn("Could not get data " + dataName + " as double", e);
            return 0;
        }
    }


    /** Get km from state data. */
    public double getKm() {
        return getDataAsDouble(HYK_KM);
    }

    /** Do not copy data from daddyfact. */
    @Override
    protected void initialize(
        Artifact artifact,
        Object   context,
        CallMeta callMeta)
    {
        logger.debug("HYKArtifact.initialize");
        WINFOArtifact winfo = (WINFOArtifact) artifact;
        importData(winfo, "river");

        List<Facet> fs = new ArrayList<Facet>();

        DefaultState state = (DefaultState) getCurrentState(context);
        state.computeInit(this, hash(), context, callMeta, fs);
        if (!fs.isEmpty()) { 
            logger.debug("Facets to add in HYKArtifact.initialize ."); 
            facets.put(getCurrentStateId(), fs); 
        } 
        else { 
            logger.debug("No facets to add in HYKArtifact.initialize ("
                + state.getID() + ").");
        }
    }
}
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