package de.intevation.flys.client.client.ui;

import java.util.ArrayList;
import java.util.List;

import com.google.gwt.i18n.client.NumberFormat;

import de.intevation.flys.client.shared.model.Data;


/**
 * This UIProvider creates a widget to enter a single location (km).
 */
public class SingleLocationPanel
extends      MultipleLocationPanel
{
    /**
     * Creates a new SingleLocationPanel instance.
     */
    public SingleLocationPanel() {
        picker = new LocationPicker(this);
    }


    /** Overridden to restrict to one entered value. */
    @Override
    public List<String> validate() {
        List<String> errors = new ArrayList<String>();
        NumberFormat nf     = NumberFormat.getDecimalFormat();

        saveLocationValues(locationPanel);

        if (!locationPanel.validateForm()) {
            errors.add(MSG.wrongFormat());
            return errors;
        }

        double[] values = getLocationValues();
        double[] good   = new double[values.length];
        int      idx    = 0;

        // We want just one value to be allowed.
        if (values.length > 1) {
            errors.add(MSG.too_many_values());
        }

        for (double value: values) {
            if (value < min || value > max) {
                String tmp = MSG.error_validate_range();
                tmp = tmp.replace("$1", nf.format(value));
                tmp = tmp.replace("$2", nf.format(min));
                tmp = tmp.replace("$3", nf.format(max));
                errors.add(tmp);
            }
            else {
                good[idx++] = value;
            }
        }

        double[] justGood = new double[idx];
        for (int i = 0; i < justGood.length; i++) {
            justGood[i] = good[i];
        }

        if (!errors.isEmpty()) {
            locationPanel.setValues(justGood);
        }

        return errors;
    }


    /**
     * This method returns the selected data.
     *
     * @return the selected/inserted data.
     */
    public Data[] getData() {
        saveLocationValues(locationPanel);
        double[] values = getLocationValues();
        Data[] data = new Data[values.length+1];

        for (int i = 0; i < values.length; i++) {
            data[i] = createDataArray(getDataItemName(),
                Double.valueOf(values[i]).toString());
        }

        data[values.length] = createDataArray("ld_mode", "locations");

        return data;
    }
}
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