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

import com.google.gwt.core.client.GWT;

import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.IButton;
import com.smartgwt.client.widgets.Label;
import com.smartgwt.client.widgets.form.DynamicForm;
import com.smartgwt.client.widgets.form.fields.RadioGroupItem;
import com.smartgwt.client.widgets.layout.HLayout;
import com.smartgwt.client.widgets.layout.VLayout;

import de.intevation.flys.client.shared.model.Data;
import de.intevation.flys.client.shared.model.DataItem;
import de.intevation.flys.client.shared.model.DefaultData;
import de.intevation.flys.client.shared.model.DefaultDataItem;

import de.intevation.flys.client.client.FLYSMessages;

/**
 * The ModuleSelection combines the river selection and the module selection in
 * one widget. It will display a vertical splitted widget - the upper part will
 * render checkboxes for each module, the lower one will display a combobox at
 * the left and a map panel on the right to choose the river.
 *
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class ModuleSelection extends MapSelection {

    /** The message class that provides i18n strings.*/
    protected FLYSMessages MESSAGES = GWT.create(FLYSMessages.class);

    /** The module checkboxes.*/
    protected RadioGroupItem radio;


    /**
     * The default constructor.
     */
    public ModuleSelection() {
    }


    /**
     * This method returns a widget that renders the checkboxes for each module
     * and the MapSelection that lets the user choose the river.
     *
     * @param data The provided rivers.
     *
     * @return the module selection combined with the river selection.
     */
    public Canvas create(Data data) {
        dataName = data.getLabel();

        VLayout newLayout = new VLayout();
        newLayout.setMembersMargin(10);

        Canvas moduleSelection = createWidget();
        Canvas riverSelection  = super.createWidget(data);
        IButton go             = new IButton(MESSAGES.next(), this);

        moduleSelection.setHeight(25);

        newLayout.addMember(moduleSelection);
        newLayout.addMember(riverSelection);
        newLayout.addMember(go);

        return newLayout;
    }


    /**
     * Creates a widget that displays a checkbox for each module.
     *
     * @return a widget with checkboxes.
     */
    protected Canvas createWidget() {
        HLayout layout = new HLayout();

        Label      label = new Label(MESSAGES.module_selection());
        DynamicForm form = new DynamicForm();

        radio = new RadioGroupItem("plugin");

        label.setWidth(50);

        radio.setShowTitle(false);
        radio.setVertical(false);
        radio.setValueMap(
            messages.winfo(),
            messages.minfo(),
            messages.map(),
            messages.fix());

        form.setFields(radio);

        layout.addMember(label);
        layout.addMember(form);

        return layout;
    }


    /**
     * This method prepares the data of two widgets - the module selection and
     * the river selection. The returning field will contain the Data that
     * represents the module selection at first position, the second position
     * stores the Data object that represents the river selection.
     *
     * @return the Data that was chosen in this widget.
     */
    protected Data[] getData() {
        Data[] river = super.getData();

        String module = radio.getValueAsString();

        DataItem[] items = new DefaultDataItem[1];
        items[0]         = new DefaultDataItem(module, module, module);

        Data       data  = new DefaultData("module", null, null, items, null);

        return new Data[] {data, river[0]};
    }
}
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