package de.intevation.flys.artifacts.states;

import gnu.trove.TDoubleArrayList;

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.model.Gauge;
import de.intevation.flys.model.River;
import de.intevation.flys.model.Wst;

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

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

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


    /** The default step width for Qs.*/
    public static final String DEFAULT_STEP_Q = "50";

    /** The default step width for Qs.*/
    public static final String DEFAULT_STEP_W = "30";

    /** The name of the 'mode' field. */
    public static final String WQ_MODE = "wq_mode";

    /** The name of the 'selection' field.*/
    public static final String WQ_SELECTION = "wq_selection";

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

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

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

    /** The name of the 'single' field. */
    public static final String WQ_SINGLE = "wq_single";


    /**
     * The default constructor that initializes an empty State object.
     */
    public WQSelect() {
    }

    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)
    {
        // TODO Insert correct min/max values!
        double[] minmaxW = determineMinMaxW(artifact);
        double[] minmaxQ = determineMinMaxQ(artifact);

        if (name.equals("wq_from")) {
            Element minW = createItem(
                cr, new String[] {"minW", new Double(minmaxW[0]).toString()});
            Element minQ = createItem(
                cr, new String[] {"minQ", new Double(minmaxQ[0]).toString()});
            return new Element[] { minW, minQ };
        }
        else if (name.equals("wq_to")) {
            Element maxW = createItem(
                cr, new String[] {"maxW", new Double(minmaxW[1]).toString()});
            Element maxQ = createItem(
                cr, new String[] {"maxQ", new Double(minmaxQ[1]).toString()});
            return new Element[] { maxW, maxQ };
        }
        else {
            Element stepW = createItem(
                cr, new String[] {"stepW", DEFAULT_STEP_W});
            Element stepQ = createItem(
                cr, new String[] {"stepQ", DEFAULT_STEP_Q});
            return new Element[] { stepW, stepQ };
        }
    }


    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 String getUIProvider() {
        return "wq_panel";
    }


    /**
     * Determines the min and max W value for the current gauge. If no min and
     * max values could be determined, this method will return
     * [Double.MIN_VALUE, Double.MAX_VALUE].
     *
     * @param artifact The FLYSArtifact.
     *
     * @return the min and max W values for the current gauge.
     */
    protected double[] determineMinMaxW(Artifact artifact) {
        logger.debug("WQSelect.determineCurrentGauge");

        Gauge    gauge   = ((FLYSArtifact) artifact).getGauge();
        double[] minmaxW = gauge != null ? gauge.determineMinMaxW() : null;

        double minW = minmaxW != null ? minmaxW[0] : Double.MIN_VALUE;
        double maxW = minmaxW != null ? minmaxW[1] : Double.MAX_VALUE;

        return new double[] { minW, maxW };
    }


    /**
     * Determines the min and max Q value for the current gauge. If no min and
     * max values could be determined, this method will return
     * [Double.MIN_VALUE, Double.MAX_VALUE].
     *
     * @param artifact The FLYSArtifact.
     *
     * @return the min and max Q values for the current gauge.
     */
    protected double[] determineMinMaxQ(Artifact artifact) {
        logger.debug("WQSelect.determineMinMaxQ");

        FLYSArtifact flysArtifact = (FLYSArtifact) artifact;

        River    river = flysArtifact.getRiver();
        Gauge    gauge = flysArtifact.getGauge();
        Wst      wst   = WstFactory.getWst(river);

        double[] minmaxQ = gauge != null
            ? wst.determineMinMaxQ(gauge.getRange())
            : null;

        double minQ = minmaxQ != null ? minmaxQ[0] : Double.MIN_VALUE;
        double maxQ = minmaxQ != null ? minmaxQ[1] : Double.MAX_VALUE;

        return new double[] { minQ, maxQ };
    }


    @Override
    public boolean validate(Artifact artifact, CallContext context)
    throws IllegalArgumentException
    {
        logger.debug("WQSelect.validate");

        FLYSArtifact flys = (FLYSArtifact) artifact;

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

        if (selectionMode == null || selectionMode.equals("single")) {
            return validateSingle(artifact, context);
        }
        else {
            return validateRange(artifact, context);
        }
    }


    protected boolean validateBounds(
        double fromValid, double toValid,
        double from,      double to,      double step)
    throws IllegalArgumentException
    {
        logger.debug("RangeState.validateRange");

        if (from < fromValid) {
            logger.error(
                "Invalid 'from'. " + from + " is smaller than " + fromValid);
            throw new IllegalArgumentException("error_feed_from_out_of_range");
        }
        else if (to > toValid) {
            logger.error(
                "Invalid 'to'. " + to + " is bigger than " + toValid);
            throw new IllegalArgumentException("error_feed_to_out_of_range");
        }

        return true;
    }


    protected boolean validateSingle(Artifact artifact, CallContext context)
    throws    IllegalArgumentException
    {
        logger.debug("WQSelect.validateSingle");

        FLYSArtifact flys = (FLYSArtifact) artifact;
        StateData    data = getData(flys, WQ_SINGLE);

        String tmp = data != null ? (String) data.getValue() : null;

        if (tmp == null || tmp.length() == 0) {
            throw new IllegalArgumentException("error_empty_state");
        }

        String[] strValues = tmp.split(" ");
        TDoubleArrayList all = new TDoubleArrayList();

        for (String strValue: strValues) {
            try {
                all.add(Double.parseDouble(strValue));
            }
            catch (NumberFormatException nfe) {
                logger.warn(nfe, nfe);
            }
        }

        all.sort();

        StateData dMode = getData(flys, WQ_MODE);
        String    mode  = dMode != null ? (String) data.getValue() : null;

        logger.debug("WQ Mode: " + mode);

        double[] minmax = null;

        if (mode != null && mode.trim().toLowerCase().equals("w")) {
            minmax = determineMinMaxW(artifact);
        }
        else {
            minmax = determineMinMaxQ(artifact);
        }

        double min = all.get(0);
        double max = all.get(all.size()-1);

        logger.debug("Inserted min value = " + min);
        logger.debug("Inserted max value = " + max);

        return validateBounds(minmax[0], minmax[1], min, max, 0d);
    }


    protected boolean validateRange(Artifact artifact, CallContext context)
    throws    IllegalArgumentException
    {
        logger.debug("WQSelect.validateRange");
        FLYSArtifact flys = (FLYSArtifact) artifact;

        StateData data = flys.getData(WQ_MODE);
        String    mode = data != null ? (String) data.getValue() : null;
        logger.debug("WQ Mode: " + mode);

        if (mode == null || mode.length() == 0) {
            throw new IllegalArgumentException("error_feed_invalid_wq_mode");
        }

        StateData dFrom = flys.getData(WQ_FROM);
        StateData dTo   = flys.getData(WQ_TO);
        StateData dStep = flys.getData(WQ_STEP);

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

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

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

            if (mode != null && mode.trim().toLowerCase().equals("w")) {
                return validateW(artifact, context, from, to, step);
            }
            else if (mode != null && mode.trim().toLowerCase().equals("q")) {
                return validateQ(artifact, context, from, to, step);
            }
            else {
                throw new IllegalArgumentException(
                    "error_feed_invalid_wq_mode");
            }
        }
        catch (NumberFormatException nfe) {
            throw new IllegalArgumentException("error_feed_number_format");
        }
    }


    /**
     * Validates the inserted W values.
     *
     * @param artifact The owner artifact.
     * @param context The CallContext
     * @param from The lower value of the W range.
     * @param to The upper value of the W range.
     * @param step The step width.
     *
     * @return true, if everything was fine, otherwise an exception is thrown.
     */
    protected boolean validateW(
        Artifact    artifact,
        CallContext context,
        double from,
        double to,
        double step)
    throws    IllegalArgumentException
    {
        logger.debug("WQSelect.validateW");

        double[] minmaxW = determineMinMaxW(artifact);

        return validateBounds(minmaxW[0], minmaxW[1], from, to, step);
    }


    /**
     * Validates the inserted Q values.
     *
     * @param artifact The owner artifact.
     * @param context The CallContext
     * @param from The lower value of the Q range.
     * @param to The upper value of the Q range.
     * @param step The step width.
     *
     * @return true, if everything was fine, otherwise an exception is thrown.
     */
    protected boolean validateQ(
        Artifact    artifact,
        CallContext context,
        double from,
        double to,
        double step)
    throws    IllegalArgumentException
    {
        logger.debug("WQSelect.validateQ");

        double[] minmaxQ = determineMinMaxQ(artifact);

        return validateBounds(minmaxQ[0], minmaxQ[1], from, to, step);
    }
}
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