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

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

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

import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.IButton;
import com.smartgwt.client.widgets.events.ClickEvent;
import com.smartgwt.client.widgets.events.ClickHandler;
import com.smartgwt.client.widgets.form.DynamicForm;
import com.smartgwt.client.widgets.form.fields.ComboBoxItem;
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;
import de.intevation.flys.client.client.event.HasStepForwardHandlers;
import de.intevation.flys.client.client.event.StepForwardEvent;
import de.intevation.flys.client.client.event.StepForwardHandler;


/**
 * This UIProvider displays the DataItems of the Data object in a combo box.
 *
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class SelectProvider implements UIProvider, HasStepForwardHandlers,
                                       ClickHandler
{
    /** The message class that provides i18n strings.*/
    protected FLYSMessages messages = GWT.create(FLYSMessages.class);

    /** The StepForwardHandlers.*/
    protected List<StepForwardHandler> forwardHandlers;

    /** The combobox.*/
    protected ComboBoxItem combobox;


    /**
     * Creates a new UIProvider instance of this class.
     */
    public SelectProvider() {
        forwardHandlers = new ArrayList<StepForwardHandler>();
    }


    public void addStepForwardHandler(StepForwardHandler handler) {
        if (handler != null) {
            GWT.log("SelectProvider - addStepForwardHandler()");
            forwardHandlers.add(handler);
        }

        GWT.log("Handlers now: " + forwardHandlers.size());
    }


    /**
     * This method is called after the user has clicked on the 'next' button to
     * step to the next state.
     *
     * @param e The StepForwardEvent.
     */
    protected void fireStepForwardEvent(StepForwardEvent e) {
        GWT.log("SelectProvider - fireStepForwardEvent() handlers: " + forwardHandlers.size());
        for (StepForwardHandler handler: forwardHandlers) {
            GWT.log("SelectProvider - fireStepForwardEvent()");
            handler.onStepForward(e);
        }
    }

    public void onClick(ClickEvent e) {
        GWT.log("SelectProvider - feed and advance...");
        Data[] data = getData();

        GWT.log("GO ON...");
        SelectProvider.this.fireStepForwardEvent(new StepForwardEvent(data));
    }

    /**
     * This method currently returns a
     * {@link com.smartgwt.client.widgets.form.DynamicForm} that contains all
     * data items in a combobox stored in <i>data</i>.
     *
     * @param data The {@link Data} object.
     *
     * @return a combobox.
     */
    public Canvas create(Data data) {
        VLayout v = new VLayout();

        Canvas content = createWidget(data);

        IButton button = new IButton(messages.next(), this);
        //IButton button = new IButton(messages.next(), new ClickHandler() {
        //    public void onClick(ClickEvent e) {
        //        GWT.log("SelectProvider - feed and advance...");
        //        Data[] data = getData();

        //        GWT.log("GO ON...");
        //        SelectProvider.this.fireStepForwardEvent(new StepForwardEvent(data));
        //    }
        //});

        v.addMember(content);
        v.addMember(button);

        return v;
    }


    /**
     * This method creates the content of the widget.
     *
     * @param data The {@link Data} object.
     *
     * @return a combobox.
     */
    protected Canvas createWidget(Data data) {
        GWT.log("SelectProvider - create()");

        DynamicForm form      = new DynamicForm();
        combobox = new ComboBoxItem("river");

        LinkedHashMap<String, String> it = new LinkedHashMap<String, String>();

        for (DataItem item: data.getItems()) {
            GWT.log("Add item: " + item.getLabel());
            it.put(item.getStringValue(), item.getLabel());
        }

        combobox.setValueMap(it);
        form.setItems(combobox);

        return form;
    }


    protected Data[] getData() {
        String selection = combobox.getValueAsString();

        GWT.log("SelectProvider - getData() Selected value = " + selection);
        DataItem item = new DefaultDataItem("river", null, selection);

        return new Data[] { new DefaultData(
            "river", null, null, new DataItem[] { item }, null) };
    }
}
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