/* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
 * Software engineering by Intevation GmbH
 *
 * This file is Free Software under the GNU AGPL (>=v3)
 * and comes with ABSOLUTELY NO WARRANTY! Check out the
 * documentation coming with Dive4Elements River for details.
 */

package org.dive4elements.river.artifacts.states;

import org.apache.log4j.Logger;
import org.dive4elements.artifactdatabase.data.StateData;
import org.dive4elements.artifacts.Artifact;
import org.dive4elements.artifacts.CallContext;
import org.dive4elements.artifacts.common.utils.XMLUtils;
import org.dive4elements.river.artifacts.D4EArtifact;
import org.w3c.dom.Element;

/**
 * @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 log = Logger.getLogger(WaterlevelGroundDifferences.class);

    protected String getLowerField() {
        return LOWER_FIELD;
    }

    protected String getUpperField() {
        return UPPER_FIELD;
    }

    protected String getStepField() {
        return DIFF_FIELD;
    }

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

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

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

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

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

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

    // ist mit super identisch!
    // 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
    public boolean validate(final Artifact artifact) throws IllegalArgumentException {
        final D4EArtifact flys = (D4EArtifact) artifact;

        final StateData dFrom = getData(flys, getLowerField());
        final StateData dTo = getData(flys, getUpperField());
        final StateData dStep = getData(flys, getStepField());

        final String fromStr = dFrom != null ? (String) dFrom.getValue() : null;
        final String toStr = dTo != null ? (String) dTo.getValue() : null;
        final String stepStr = dStep != null ? (String) dStep.getValue() : null;

        if (fromStr == null || toStr == null || stepStr == null) {
            throw new IllegalArgumentException("error_empty_state");
        }

        try {
            final double from = Double.parseDouble(fromStr);
            final double to = Double.parseDouble(toStr);
            final double step = Double.parseDouble(stepStr);

            final double[] minmax = getMinMax(flys);

            return validateBounds(minmax[0], minmax[1], from, to, step);
        }
        catch (final NumberFormatException nfe) {
            throw new IllegalArgumentException("error_invalid_double_value");
        }
    }

    @Override
    protected boolean validateBounds(final double fromValid, final double toValid, final double from, final double to) throws IllegalArgumentException {
        if (to < 0d) {
            log.error("Invalid 'to' " + to + " is lesser than zero.");
            throw new IllegalArgumentException("error_feed_from_out_of_range");
        }
        return super.validateBounds(fromValid, toValid, from, to);
    }
}
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