/* 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 java.util.List;

import org.apache.log4j.Logger;
import org.dive4elements.artifactdatabase.ProtocolUtils;
import org.dive4elements.artifactdatabase.state.Facet;
import org.dive4elements.artifacts.Artifact;
import org.dive4elements.artifacts.CallContext;
import org.dive4elements.artifacts.common.utils.XMLUtils.ElementCreator;
import org.dive4elements.river.artifacts.D4EArtifact;
import org.dive4elements.river.artifacts.model.FacetTypes;
import org.dive4elements.river.artifacts.resources.Resources;
import org.dive4elements.river.backend.utils.StringUtil;
import org.w3c.dom.Element;

/**
 * State in which the user selects 1 to n pairs of Waterlevels and alikes.
 */
public class WaterlevelPairSelectState extends DefaultState implements FacetTypes {
    /** The log that is used in this state. */
    private static Logger log = Logger.getLogger(WaterlevelPairSelectState.class);

    /** Trivial constructor. */
    public WaterlevelPairSelectState() {
    }

    /** Specify to display a datacage_twin_panel. */
    @Override
    protected String getUIProvider() {
        return "waterlevel_twin_panel";
    }

    /**
     * Overridden to do nothing.
     */
    @Override
    public Object computeAdvance(final D4EArtifact artifact, final String hash, final CallContext context, final List<Facet> facets, final Object old) {
        // Get data and do stuff, do not calculate
        return "";
    }

    /**
     * Create elements for document (prepopulated with data, if any).
     *
     * @param artifact
     *            D4EArtifact to get data from.
     * @param name
     *            DataName, expceted to be "diffids".
     */
    @Override
    protected Element[] createItems(final ElementCreator cr, final Artifact artifact, final String name, final CallContext context) {
        log.debug("createItems: " + name);
        if (name.equals("diffids")) {
            final Element item = ProtocolUtils.createArtNode(cr, "item", null, null);
            final Element label = ProtocolUtils.createArtNode(cr, "label", null, null);
            final Element value = ProtocolUtils.createArtNode(cr, "value", null, null);
            final D4EArtifact flys = (D4EArtifact) artifact;
            final String s = flys.getDataAsString("diffids");
            value.setTextContent(s);
            item.appendChild(label);
            item.appendChild(value);
            return new Element[] { item };
        }
        return new Element[] {};
    }

    /**
     * Creats the data element used for the static part of DESCRIBE document.
     */
    @Override
    protected Element createStaticData(final D4EArtifact flys, final ElementCreator creator, final CallContext cc, final String name, final String value,
            final String type) {
        final Element dataElement = creator.create("data");
        creator.addAttr(dataElement, "name", name, true);
        creator.addAttr(dataElement, "type", type, true);

        final Element itemElement = creator.create("item");
        creator.addAttr(itemElement, "value", value, true);

        final String[] labels = getLabels(cc, value, false);
        final Object[] obj = new Object[] { labels[0] };

        // TODO own i18n
        final String attrValue = Resources.getMsg(cc.getMeta(), "wsp.selected.string", "wsp.selected.string", obj);
        // I18N_STATIC_KEY, I18N_STATIC_KEY, obj);

        creator.addAttr(itemElement, "label", attrValue, true);
        dataElement.appendChild(itemElement);

        return dataElement;
    }

    /**
     * Get name to display for selected watelerlevels (for example "Q=123")
     * from the CalculationResult.
     */
    public static String[] getLabels(final CallContext cc, final String value, final boolean minuendSubtrahendUiReversed) {
        final String[] recommendations = value.split("#");
        String displayString = "";

        // Walk over all selected recommendations and create label
        // like "W (Q=1) - W (Q=2)".
        final int minuendIndex = minuendSubtrahendUiReversed ? 1 : 0;
        final int subtrahendIndex = minuendSubtrahendUiReversed ? 0 : 1;

        for (int i = 0; i < recommendations.length; i += 2) {
            final String[] minuendParts = StringUtil.unbracket(recommendations[i + minuendIndex]).split(";");
            if (minuendParts.length >= 4) {
                displayString += "(" + minuendParts[3];
            } else {
                displayString += "([error]";
            }

            displayString += " - ";

            final String[] subtrahendParts = StringUtil.unbracket(recommendations[i + subtrahendIndex]).split(";");
            if (subtrahendParts.length >= 4) {
                displayString += subtrahendParts[3] + ") ";
            } else {
                displayString += "[error])";
            }
        }

        return new String[] { displayString };
    }

}
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