package de.intevation.flys.artifacts.model.sq;

import org.apache.log4j.Logger;

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

import de.intevation.flys.artifacts.FLYSArtifact;
import de.intevation.flys.artifacts.math.fitting.Function;
import de.intevation.flys.artifacts.math.fitting.FunctionFactory;
import de.intevation.flys.artifacts.model.CalculationResult;
import de.intevation.flys.artifacts.model.DataFacet;
import de.intevation.flys.artifacts.model.FacetTypes;
import de.intevation.flys.artifacts.model.Parameters;

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


/**
 * Facet to show the curve in a sq relation.
 *
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class SQCurveFacet extends DataFacet implements FacetTypes {

    private static final Logger log = Logger.getLogger(SQCurveFacet.class);


    public static final String FUNCTION = "sq-pow";


    private int fractionIdx;


    public SQCurveFacet() {
    }


    public SQCurveFacet(
        int    idx,
        int    fractionIdx,
        String name,
        String description,
        String hash,
        String stateId
    ) {
        super(idx, name, description, ComputeType.ADVANCE, hash, stateId);
        this.fractionIdx = fractionIdx;
    }


    @Override
    public Object getData(Artifact artifact, CallContext context) {
        log.debug("SQCurveFacet.getData");

        if (artifact instanceof FLYSArtifact) {
            FLYSArtifact flys = (FLYSArtifact) artifact;

            CalculationResult res = (CalculationResult) flys.compute(
                context, ComputeType.ADVANCE, false);

            SQResult[]       results = (SQResult[]) res.getData();
            SQFractionResult result  = results[index].getFraction(fractionIdx);

            Function func = FunctionFactory.getInstance().getFunction(FUNCTION);
            String[] paramNames = func.getParameterNames();

            Parameters params = result.getParameters();
            double[]   coeffs = params.get(0, paramNames);

            if (log.isDebugEnabled()) {
                for (int i = 0, N = paramNames.length; i < N; i++) {
                    log.debug("retrieved parameter " + paramNames[i] +
                              " = " + coeffs[i]);
                }
            }

            de.intevation.flys.artifacts.math.Function mf =
                func.instantiate(coeffs);

            return new SQFunction(mf, result.getMinQ(), result.getMaxQ());
        }

        return null;
    }


    @Override
    public SQCurveFacet deepCopy() {
        SQCurveFacet copy = new SQCurveFacet();
        copy.set(this);

        return copy;
    }
}
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