/*
 * Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 David Berkman
 * 
 * This file is part of the SmallMind Code Project.
 * 
 * The SmallMind Code Project is free software, you can redistribute
 * it and/or modify it under either, at your discretion...
 * 
 * 1) The terms of GNU Affero General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 * 
 * ...or...
 * 
 * 2) The terms of the Apache License, Version 2.0.
 * 
 * The SmallMind Code Project 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 or Apache License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * and the Apache License along with the SmallMind Code Project. If not, see
 * <http://www.gnu.org/licenses/> or <http://www.apache.org/licenses/LICENSE-2.0>.
 * 
 * Additional permission under the GNU Affero GPL version 3 section 7
 * ------------------------------------------------------------------
 * If you modify this Program, or any covered work, by linking or
 * combining it with other code, such other code is not for that reason
 * alone subject to any of the requirements of the GNU Affero GPL
 * version 3.
 */
package org.smallmind.wicket.component.tabs;

import java.util.LinkedList;
import java.util.List;
import java.util.Properties;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.extensions.markup.html.tabs.ITab;
import org.apache.wicket.markup.html.WebMarkupContainer;
import org.apache.wicket.markup.html.list.ListItem;
import org.apache.wicket.markup.html.list.ListView;
import org.apache.wicket.markup.html.panel.Panel;
import org.apache.wicket.protocol.http.WebApplication;
import org.smallmind.wicket.behavior.CssBehavior;
import org.smallmind.wicket.skin.SkinManager;

public class TabPanel extends Panel {

  private SelectionChangedCallback selectionChangedCallback;
  private LinkedList<Tab> tabList;
  private WebMarkupContainer tabContents;
  private int selectedIndex = 0;

  public TabPanel (String id, SkinManager skinManager) {

    this(id, 0, skinManager);
  }

  public TabPanel (String id, int selectedIndex, SkinManager skinManager) {

    super(id);

    Properties cssProperties;

    this.selectedIndex = selectedIndex;

    tabList = new LinkedList<>();

    setOutputMarkupId(true);

    add(new TabListView("tabCell", tabList));

    tabContents = new WebMarkupContainer("tabContents");
    tabContents.setOutputMarkupId(true);
    add(tabContents);

    cssProperties = skinManager.getProperties((WebApplication)getApplication(), TabPanel.class);
    cssProperties.put("contextpath", ((WebApplication)getApplication()).getServletContext().getContextPath());
    add(new CssBehavior(Tab.class, "Tab.css", cssProperties));
  }

  public synchronized TabPanel setSelectionChangedCallback (SelectionChangedCallback selectionChangedCallback) {

    this.selectionChangedCallback = selectionChangedCallback;

    return this;
  }

  public synchronized TabPanel addTab (ITab tab) {

    if (tabList.size() == selectedIndex) {
      tabContents.add(tab.getPanel("tabPanel"));
    }

    tabList.add(new Tab("tab", this, tab, tabList.size(), tabList.size() == selectedIndex));

    return this;
  }

  public synchronized void setSelectedIndex (final AjaxRequestTarget target, int index) {

    Tab selectedTab;

    target.add(tabList.get(selectedIndex).setSelected(false));
    selectedTab = tabList.get(index).setSelected(true);
    tabContents.replace(selectedTab.getPanel("tabPanel"));

    target.add(tabContents);
    target.add(selectedTab);

    selectedIndex = index;

    if (selectionChangedCallback != null) {
      selectionChangedCallback.onSelectionChanged(target, index);
    }
  }

  private class TabListView extends ListView {

    public TabListView (String id, List<Tab> tabList) {

      super(id, tabList);

      setReuseItems(true);
    }

    protected void populateItem (ListItem listItem) {

      listItem.add((Tab)listItem.getModelObject());
    }
  }
}