/*******************************************************************************
 * Copyright 2015 xWic group (http://www.xwic.de)
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * 		http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software 
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and 
 * limitations under the License.
 *  
 *******************************************************************************/
/**
 * 
 */
package de.jwic.controls;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import de.jwic.base.Control;
import de.jwic.base.ControlContainer;
import de.jwic.base.IControlContainer;
import de.jwic.base.IResourceControl;
import de.jwic.base.JWicException;
import de.jwic.base.JavaScriptSupport;
import de.jwic.events.SelectionEvent;
import de.jwic.events.SelectionListener;

/**
 * Represents a TabStrip control using the jQuery Tabs control. Controls added to the 
 * tabs are rendered on demand and remain in the client even if tabs are switched. When
 * a user re-opens a tab, the content is not automatically refreshed.
 *  
 * @author lippisch
 */
@JavaScriptSupport
public class TabStrip extends ControlContainer implements IResourceControl {

	private final Set<SelectionListener> listeners;
	
	private List<Tab> tabs = new ArrayList<Tab>();
	
	private String activeTabName = null;
	
	/**
	 * @param container
	 */
	public TabStrip(IControlContainer container) {
		this(container, null);
	}

	/**
	 * @param container
	 * @param name
	 */
	public TabStrip(IControlContainer container, String name) {
		super(container, name);
		this.listeners = new HashSet<SelectionListener>();
	}

	/**
	 * A tab was activated..
	 * @param tabName
	 */
	public void actionActivateTab(String tabName) {
		
		if (activeTabName != null && !activeTabName.equals(tabName)) {
			setActiveTabName(tabName, false);
			
		}
	}
	
	/**
	 * Returns the index of the active tab.
	 * @return
	 */
	public int getActiveIndex() {
		if (activeTabName != null) {
			for (int i = 0; i < tabs.size(); i++) {
				if (activeTabName.equals(tabs.get(i).getName())) {
					return i;
				}
			}
		}
		return 0;
	}
	
	
	/* (non-Javadoc)
	 * @see de.jwic.base.IResourceControl#attachResource(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
	 */
	@Override
	public void attachResource(HttpServletRequest req, HttpServletResponse res) throws IOException {

	}

	/**
	 * Add a tab to the TabStrip.
	 * @param title
	 * @return
	 */
	public Tab addTab(String title) {
	
		return addTab(title, null);
		
	}

	/**
	 * Add a tab to the TabStrip with a custom name.
	 * @param title
	 * @return
	 */
	public Tab addTab(String title, String name) {
	
		Tab newTab = new Tab(this, name, title);
		if (activeTabName == null) {
			activeTabName = newTab.getName();
		} 
		return newTab;
		
	}

	/**
	 * @return the tabs
	 */
	public List<Tab> getTabs() {
		return tabs;
	}

	/* (non-Javadoc)
	 * @see de.jwic.base.ControlContainer#registerControl(de.jwic.base.Control, java.lang.String)
	 */
	public void registerControl(Control control, String name)
			throws JWicException {
		if (!(control instanceof Tab)) {
			throw new IllegalArgumentException("Only TabControls may be added to a TabStripControl.");
		}
		super.registerControl(control, name);
		tabs.add((Tab) control);
		
	}
	
	/* (non-Javadoc)
	 * @see de.jwic.base.ControlContainer#unregisterControl(de.jwic.base.Control)
	 */
	public void unregisterControl(Control control) {
		if(control != null) {
			tabs.remove(control);
			if (control.getName().equals(getActiveTabName())) {
				if (tabs.size() > 0) {
					setActiveTabName(tabs.get(0).getName());
				} else {
					setActiveTabName(null);
				}
			}
		}
		super.unregisterControl(control);
	}

	/* (non-Javadoc)
	 * @see de.jwic.base.ControlContainer#isRenderingRelevant(de.jwic.base.Control)
	 */
	public boolean isRenderingRelevant(Control childControl) {
		return childControl.getName().equals(activeTabName);
	}
	
	/**
	 * Returns the name of the active tab.
	 * @return java.lang.String
	 */
	public String getActiveTabName() {
		return activeTabName ;
	}
	/**
	 * Creation date: (03.02.2003 12:26:12)
	 * @param newActiveTabName java.lang.String
	 */
	public void setActiveTabName(String newActiveTabName) {
		setActiveTabName(newActiveTabName, true);
	}
	
	/**
	 * Creation date: (03.02.2003 12:26:12)
	 * @param newActiveTabName java.lang.String
	 */
	protected void setActiveTabName(String newActiveTabName, boolean executeActivateScript) {
		for (Tab tab : tabs) {
			if (tab.getName().equals(newActiveTabName)) {
				activeTabName = newActiveTabName;
				tab.requireRedraw(); // force drawing the control
				SelectionEvent event = new SelectionEvent(tab);
				for(SelectionListener sl : new HashSet<SelectionListener>(this.listeners)){
					sl.objectSelected(event);
				}
				
				break;
			}
		}
		if(executeActivateScript)
			getSessionContext().queueScriptCall("JWic.controls.TabStrip.activate('" + getControlID() + "', " + getActiveIndex() +");");
	}

	/**
	 * @param listener
	 * @return
	 */
	public boolean addSelectionListener(SelectionListener listener) {
		return listeners.add(listener);
	}

	/**
	 * @param listener
	 * @return
	 */
	public boolean removeSelectionListener(SelectionListener listener) {
		return listeners.remove(listener);
	}
	
	public void removeAllListener(){
		this.listeners.clear();
	}

}