package de.intevation.flys.artifacts.states;

import org.w3c.dom.Element;

import org.apache.log4j.Logger;

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

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

import de.intevation.artifactdatabase.ProtocolUtils;


/**
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class WaterlevelGroundDifferences extends RangeState {

    public static final String LOWER_FIELD  = "diff_from";
    public static final String UPPER_FIELD  = "diff_to";
    public static final String DIFF_FIELD   = "diff_diff";

    public static final double DEFAULT_STEP = 0d;


    private static Logger logger =
        Logger.getLogger(WaterlevelGroundDifferences.class);



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


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


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


    @Override
    protected double[] getMinMax(Artifact artifact) {
        return new double[] { -Double.MAX_VALUE, Double.MAX_VALUE };
    }


    @Override
    protected String getUIProvider() {
        return "waterlevel_ground_panel";
    }


    protected double getDefaultStep() {
        return DEFAULT_STEP;
    }


    @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(LOWER_FIELD)) {
            Element min = createItem(
                cr,
                new String[] {"min", new Double(minVal).toString()});

            return new Element[] { min };
        }
        else if (name.equals(UPPER_FIELD)) {
            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;
    }
}
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