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.CallMeta;

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

import de.intevation.artifactdatabase.data.StateData;

import de.intevation.flys.artifacts.FLYSArtifact;
import de.intevation.flys.artifacts.resources.Resources;

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

    /** The logger that is used in this class. */
    private static Logger logger = Logger.getLogger(CalculationSelectMinfo.class);


    public static final String FIELD_MODE = "calculation_mode";

    public static final String CALC_BED_MIDDLE    = "calc.bed.middle";
    public static final String CALC_BED_DIFF      = "calc.bed.diff";
    public static final String CALC_BED_QUALITY   = "calc.bed.quality";
    public static final String CALC_SEDIMENT_LOAD = "calc.sediment.load";
    public static final String CALC_FLOW_VELOCITY = "calc.flow.velocity";
    public static final String CALC_SQ_RELATION   = "calc.sq.relation";

    /** An array that holds all available calculation modes. */
    public static final String[] CALCULATIONS = {
        CALC_BED_MIDDLE,
        CALC_BED_DIFF,
        CALC_BED_QUALITY,
        CALC_SEDIMENT_LOAD,
        CALC_FLOW_VELOCITY,
        CALC_SQ_RELATION
    };


    /** Error message that is thrown if no mode has been chosen. */
    public static final String ERROR_NO_CALCULATION_MODE =
        "error_feed_no_calculation_mode";

    /** Error message that is thrown if an invalid calculation mode has been
     * chosen. */
    public static  final String ERROR_INVALID_CALCULATION_MODE =
        "error_feed_invalid_calculation_mode";


    public CalculationSelectMinfo() {
    }


    @Override
    protected Element[] createItems(
        XMLUtils.ElementCreator cr,
        Artifact    artifact,
        String      name,
        CallContext context)
    {
        CallMeta meta   = context.getMeta();
        Element[] calcs = new Element[CALCULATIONS.length];

        for (int i = 0; i < CALCULATIONS.length; ++i) {
            String calc = CALCULATIONS[i];
            calcs[i] = createItem(
                cr, new String[] {
                    Resources.getMsg(meta, calc, calc),
                    calc
                });
        }

        return calcs;
    }


    @Override
    public boolean validate(Artifact artifact)
    throws IllegalArgumentException
    {
        logger.debug("CalculationSelect.validate");
        FLYSArtifact flys = (FLYSArtifact) artifact;

        StateData data = getData(flys, FIELD_MODE);
        String    calc = (data != null) ? (String) data.getValue() : null;

        if (calc == null) {
            throw new IllegalArgumentException(ERROR_NO_CALCULATION_MODE);
        }

        calc = calc.trim().toLowerCase();

        for (String mode: CALCULATIONS) {
            if (mode.equals(calc)) {
                return true;
            }
        }

        throw new IllegalArgumentException(ERROR_INVALID_CALCULATION_MODE);
    }
}
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