/* 
 * 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: '',
            collapseHtml: '',
            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);