package de.intevation.flys.artifacts.states;

import org.apache.log4j.Logger;

import org.w3c.dom.Element;

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

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

import de.intevation.artifactdatabase.ProtocolUtils;
import de.intevation.artifactdatabase.data.StateData;

import de.intevation.flys.artifacts.FLYSArtifact;

import de.intevation.flys.artifacts.model.FacetTypes;
import de.intevation.flys.artifacts.resources.Resources;

import de.intevation.flys.utils.FLYSUtils;


/**
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class ComputationRangeState
extends    RangeState
implements FacetTypes
{
    private static Logger logger =
        Logger.getLogger(ComputationRangeState.class);

    /** The name of the 'from' field. */
    public static final String FROM = "ld_from";

    /** The name of the 'to' field. */
    public static final String TO = "ld_to";

    /** The name of the 'step' field. */
    public static final String STEP = "ld_step";

    /** The default step width. */
    public static final int DEFAULT_STEP = 100;


    public ComputationRangeState() {
    }


    @Override
    protected Element createData(
        XMLUtils.ElementCreator cr,
        Artifact    artifact,
        StateData   data,
        CallContext context)
    {
        Element select = ProtocolUtils.createArtNode(
            cr, "select", null, null);

        cr.addAttr(select, "name", data.getName(), true);

        Element label = ProtocolUtils.createArtNode(
            cr, "label", null, null);

        Element choices = ProtocolUtils.createArtNode(
            cr, "choices", null, null);

        label.setTextContent(Resources.getMsg(
            context.getMeta(),
            data.getName(),
            data.getName()));

        select.appendChild(label);

        return select;
    }


    @Override
    protected Element[] createItems(
        XMLUtils.ElementCreator cr,
        Artifact    artifact,
        String      name,
        CallContext context)
    {
        double[] minmax = getMinMax(artifact);

        double minVal = Double.MIN_VALUE;
        double maxVal = Double.MAX_VALUE;

        if (minmax != null) {
            minVal = minmax[0];
            maxVal = minmax[1];
        }
        else {
            logger.warn("Could not read min/max distance values!");
        }

        if (name.equals("ld_from")) {
            Element min = createItem(
                cr,
                new String[] {"min", new Double(minVal).toString()});

            return new Element[] { min };
        }
        else if (name.equals("ld_to")) {
            Element max = createItem(
                cr,
                new String[] {"max", new Double(maxVal).toString()});

            return new Element[] { max };
        }
        else {
            Element step = createItem(
                cr,
                new String[] {"step", String.valueOf(getDefaultStep())});
            return new Element[] { step };
        }

    }


    protected Element createItem(XMLUtils.ElementCreator cr, Object obj) {
        Element item  = ProtocolUtils.createArtNode(cr, "item", null, null);
        Element label = ProtocolUtils.createArtNode(cr, "label", null, null);
        Element value = ProtocolUtils.createArtNode(cr, "value", null, null);

        String[] arr = (String[]) obj;

        label.setTextContent(arr[0]);
        value.setTextContent(arr[1]);

        item.appendChild(label);
        item.appendChild(value);

        return item;
    }


    @Override
    protected double[] getMinMax(Artifact artifact) {
        FLYSArtifact flysArtifact = (FLYSArtifact) artifact;
        return FLYSUtils.getRiverMinMax(flysArtifact);
    }


    protected double getDefaultStep() {
        return DEFAULT_STEP;
    }


    @Override
    protected String getLowerField() {
        return FROM;
    }


    @Override
    protected String getUpperField() {
        return TO;
    }


    @Override
    protected String getStepField() {
        return STEP;
    }
}
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