package com.googlecode.struts2yuiplugin.components;



import org.apache.struts2.views.annotations.StrutsTag;

import org.apache.struts2.views.annotations.StrutsTagAttribute;

import com.opensymphony.xwork2.util.ValueStack;

import com.googlecode.struts2yuiplugin.tools.YUITools;



import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.util.List;

import java.util.LinkedList;



/**

 * A YUI TabView

 */

@StrutsTag(name = "tabview", tldTagClass = "com.googlecode.struts2yuiplugin.views.jsp.ui.TabViewTag", description = "Renders a YUI TabView")

public class TabView extends ClosingYUIBean implements OGNLEvaluator {



    public static final String OPEN_TEMPLATE = "yuitabview";

    public static final String TEMPLATE = OPEN_TEMPLATE +"-close";



    /** List of tabs added to the TabvVew at creation time */

    private List<Tab> tabs;

    private String selectedTab;

    /** If no tab is selected the first will be automatically selected */

    private boolean noTabSelected;



    public TabView(ValueStack valueStack, HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) {

        super(valueStack, httpServletRequest, httpServletResponse);

        tabs = new LinkedList<Tab>();

        noTabSelected = true;

    }



    @Override

    public void evaluateParams() {

        super.evaluateParams();

        parameters.put("tabs", tabs);

        parameters.put("noTabSelected", noTabSelected);

    }



    @Override

    protected void evaluateExtraParams() {

        super.evaluateExtraParams();    

    }



    public String getDefaultOpenTemplate() {

        return OPEN_TEMPLATE;

    }



    protected String getDefaultTemplate() {

        return TEMPLATE;

    }



    /**

     * Declare a tab to for this TabView 

     * @param tab

     * @return

     */

    public boolean addTab(Tab tab) {

        if (selectedTab != null) {

            if (selectedTab.equals(tab.getId())) {

                tab.setSelected(true);

            }

        }

        if (tab.isSelected()) {

            noTabSelected = false;

        }

        return tabs.add(tab);

    }



    @StrutsTagAttribute(description = "The ID of a tab to make initially selected", required = false)

    public void setSelectedTab(String selectedTab) {

        if (selectedTab != null) {

            this.selectedTab = evaluateExpression(selectedTab);

        }

    }



    /**

     * Evaluates the OGNL expression

     *

     * @param expr OGNL expression.

     * @return the String value found.

     */

    public String evaluateExpression(String expr) {

        return super.findString(expr);

    }





}