package de.intevation.flys.artifacts.model;

import java.util.List;
import java.util.Arrays;

import de.intevation.artifactdatabase.state.Facet;

import de.intevation.artifacts.Artifact;
import de.intevation.artifacts.CallContext;

import de.intevation.flys.artifacts.FLYSArtifact;

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

import org.apache.log4j.Logger;

/** Facet for W-over-Ws. */
public class ReferenceCurveFacet 
extends      DataFacet
{
    public static final String BLACK_BOARD_KEY = "reference.curve.axis.scale";

    public static final List BLACK_BOARD_KEY_LIST =
        Arrays.asList(new String [] { BLACK_BOARD_KEY });

    private static Logger log = Logger.getLogger(ReferenceCurveFacet.class);

    public ReferenceCurveFacet() {
    }

    public ReferenceCurveFacet(int index, String name, String description) {
        super(index, name, description, ComputeType.ADVANCE, null, null);
    }

    public ReferenceCurveFacet(
        int         index,
        String      name,
        String      description,
        ComputeType type,
        String      stateID,
        String      hash
    ) {
        super(index, name, description, type, hash, stateID);
    }

    public Object getData(Artifact artifact, CallContext context) {

        if (log.isDebugEnabled()) {
            log.debug("Get data for reference curve at index: " + index +
                " /stateId: " + stateId);
        }

        return getWW(artifact, context);
    }

    protected WW getWW(Artifact artifact, CallContext context) {
        FLYSArtifact winfo = (FLYSArtifact)artifact;

        CalculationResult res = (CalculationResult)
            winfo.compute(context, hash, stateId, type, false);

        return ((WW [])res.getData())[index];
    }

    @Override
    public void set(Facet other) {
        super.set(other);
        ReferenceCurveFacet o= (ReferenceCurveFacet)other;
        type    = o.type;
        hash    = o.hash;
        stateId = o.stateId;
    }

    /** Copy deeply. */
    @Override
    public Facet deepCopy() {
        ReferenceCurveFacet copy = new ReferenceCurveFacet();
        copy.set(this);
        return copy;
    }

    @Override
    public List getDataProviderKeys(Artifact art) {
        return BLACK_BOARD_KEY_LIST;
    }

    @Override
    public Object provideBlackboardData(
        Artifact    artifact,
        Object      key,
        Object      param,
        CallContext context
    ) {
        if (!key.equals(BLACK_BOARD_KEY)) {
            return null;
        }

        Object obj = context.getContextValue("reference.curve.axis.scale");

        if (!(obj instanceof WWAxisTypes)) {
            obj = new WWAxisTypes(getWW(artifact, context));
        }
        else {
            ((WWAxisTypes)obj).classify(getWW(artifact, context));
        }

        return obj;
    }
}
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