/* 
 * jQuery - Collapser - Plugin v1.0
 * http://www.aakashweb.com/
 * Copyright 2010, Aakash Chakravarthy
 * Released under the MIT License.
 */

(function($){
    $.fn.collapser= function(options, beforeCallback, afterCallback) {
        
        var defaults = {
            target: 'next',
      targetOnly: null,
            effect: 'slide',
      changeText: true,
      expandHtml: 'Expand',
      collapseHtml: 'Collapse',
      expandClass: '',
      collapseClass:''
        };
        
        var options = $.extend(defaults, options);
    
    var expHtml,collHtml, effectShow, effectHide;
    
    if(options.effect == 'slide'){
      effectShow = 'slideDown';
      effectHide = 'slideUp';
    }else{
      effectShow = 'fadeIn';
      effectHide = 'fadeOut';
    }
    
    /*if(options.changeText == true){
      expHtml = options.expandHtml;
      collHtml = options.collapseHtml;
    }*/
    
    function callBeforeCallback(obj){
      if(beforeCallback !== undefined){
        beforeCallback.apply(obj);
      }
    }
    
    function callAfterCallback(obj){
      if(afterCallback !== undefined){
        afterCallback.apply(obj);
      }
    }
    
    function hideElement(obj, method){
      callBeforeCallback(obj);
      if(method == 1){
        obj[options.target](options.targetOnly)[effectHide]();
        obj.html(expHtml);
        obj.removeClass(options.collapseClass);
        obj.addClass(options.expandClass);
      }else{
        $(document).find(options.target)[effectHide]();
        obj.html(expHtml);
        obj.removeClass(options.collapseClass);
        obj.addClass(options.expandClass);
      }
      callAfterCallback(obj);
    }
    
    function showElement(obj, method){
      callBeforeCallback(obj)
      if(method == 1){
        obj[options.target](options.targetOnly)[effectShow]();
        obj.html(collHtml);
        obj.removeClass(options.expandClass);
        obj.addClass(options.collapseClass);
      }else{
        $(document).find(options.target)[effectShow]();
        obj.html(collHtml);
        obj.removeClass(options.expandClass);
        obj.addClass(options.collapseClass);
      }
      callAfterCallback(obj);
    }
    
    function toggleElement(obj, method){
      if(method == 1){
        if(obj[options.target](options.targetOnly).is(':visible')){
          hideElement(obj, 1);
        }else{
          showElement(obj, 1);
        }
      }else{
        if($(document).find(options.target).is(':visible')){
          hideElement(obj, 2);
        }else{
          showElement(obj, 2);
        }
      }
    }
    
    return this.each(function(){
       
       if($.fn[options.target] && $(this)[options.target]()){
        $(this).toggle(function(){    
          toggleElement($(this), 1);
        },function(){
          toggleElement($(this), 1);
        }); 
        
       }else{
         
         $(this).toggle(function(){
          toggleElement($(this), 2);
        },function(){
          toggleElement($(this), 2);
        });
       }
       
       // Initialize  
       if($.fn[options.target] && $(this)[options.target]()){
        if($(this)[options.target]().is(':hidden')){
          $(this).html(expHtml);
          $(this).removeClass(options.collapseClass);
          $(this).addClass(options.expandClass);
        }else{
          $(this).html(collHtml);
          $(this).removeClass(options.expandClass);
          $(this).addClass(options.collapseClass);
        }
      }else{
        if($(document).find(options.target).is(':hidden')){
          $(this).html(expHtml);
        }else{
          $(this).html(collHtml);
        }
      }
       
        });
    };
    
})(jQuery);