package org.activityinfo.ui.client.page.app;

/*
 * #%L
 * ActivityInfo Server
 * %%
 * Copyright (C) 2009 - 2013 UNICEF
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of the 
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public 
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/gpl-3.0.html>.
 * #L%
 */

import com.extjs.gxt.ui.client.core.El;
import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.DivElement;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.NodeList;
import com.google.gwt.event.logical.shared.HasSelectionHandlers;
import com.google.gwt.event.logical.shared.SelectionEvent;
import com.google.gwt.event.logical.shared.SelectionHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.resources.client.CssResource;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.ui.Widget;

public class SectionTabStrip extends Widget implements HasSelectionHandlers<Section> {

    private static SectionTabStripUiBinder uiBinder = GWT.create(SectionTabStripUiBinder.class);

    interface SectionTabStripUiBinder extends UiBinder<Element, SectionTabStrip> {
    }

    interface MyStyle extends CssResource {
        String section();

        String activeSection();

        String hoverSection();
    }

    @UiField DivElement sectionDiv;

    @UiField MyStyle style;

    // Not ready yet
    // SectionPopup popup;

    DivElement hoverElement;

    public SectionTabStrip() {
        setElement(uiBinder.createAndBindUi(this));
        sinkEvents(Event.MOUSEEVENTS);
        sinkEvents(Event.ONCLICK);

        // popup = new SectionPopup();

    }

    @Override
    public void onBrowserEvent(Event event) {
        El element = El.fly(Element.as(event.getEventTarget()));

        switch (DOM.eventGetType(event)) {
            case Event.ONMOUSEOVER:
                if (element.hasStyleName(style.section())) {
                    unhighlight();
                    highlight(element.dom);
                }
                break;
            case Event.ONMOUSEOUT:
                if (hoverElement != null && element.dom.isOrHasChild(hoverElement)) {
                    unhighlight();
                }
                // popup.delayedHide();
                break;
            case Event.ONCLICK:
                if (element.hasStyleName(style.section())) {
                    int index = element.getParent().getChildIndex(element.dom);
                    SelectionEvent.fire(this, Section.values()[index]);
                }
                break;
        }
    }

    private void unhighlight() {
        if (hoverElement != null) {
            hoverElement.removeClassName(style.hoverSection());
        }
    }

    private void highlight(Element element) {
        hoverElement = element.cast();
        hoverElement.addClassName(style.hoverSection());

        // popup.setPopupPosition(element.getAbsoluteLeft(),
        // element.getAbsoluteBottom());
        // popup.delayedShow();SectionPopup popup;

    }

    public void setSelection(Section section) {
        NodeList<com.google.gwt.user.client.Element> tabs = El.fly(sectionDiv).select("." + style.section());
        for (int i = 0; i != tabs.getLength(); ++i) {
            Element tab = tabs.getItem(i).cast();
            if (section != null && i == section.ordinal()) {
                tab.addClassName(style.activeSection());
            } else {
                tab.removeClassName(style.activeSection());
            }
        }
    }

    @Override
    public HandlerRegistration addSelectionHandler(SelectionHandler<Section> handler) {
        return addHandler(handler, SelectionEvent.getType());
    }
}