/* 
	JQuery Externalify 0.2
	by Aaron Lozier (lozieraj-[at]-gmail.com) (Twitter: @ajlozier)
	version 0.2
		* "confirm function" and "before leave" function added
	version 0.3
		* updated function syntax to accomodate recent Firefox bug. (see: http://stackoverflow.com/questions/1154315/javascript-firebug-cannot-access-optimized-closure-what-does-it-mean)
	
	* Binds a click event to all anchor tags passed to it which evaluates whether or not the href is a part of the current domain or not.
	* If it is, returns true and click is treated normally.
	* If not, location is opened in a new window.
	* Options: 
	*     addClass: class name to dynamically add to external links
	*     addRel: rel value to dynamically add to external links
	*     confirmFunction: callback function which must return a true value to proceed to link
	*     beforeLeave: function to call before proceeding to link
	*     openNewWindow: if true, opens external links in new window.  else opens as usual (but above options will still be applied)
	* Wishlist: Handling of other link types, including PDFs, DOCs, etc.
		
	Project Page:	
		* http://informationarchitech.com/externalify/
		
	Dependencies:
		* jQuery 1.2.x
 
	Basic Usage:
	
	$('a').externalify();
*/

(function(jQuery){
 jQuery.fn.externalify = function(options) {
    
	var defaults = {
		addClass: 'external',							//add class
		addRel: 'external',								//add rel parameter
		confirmFunction: true,
		beforeLeave: true,
		openNewWindow: true
	};
  
	var options = jQuery.extend(defaults, options);

	/* PARSING FUNCTIONS */
	
	var isolate_site = function(the_url){		
		try{	
			var first_split = the_url.split("//");
			var without_resource = first_split[1];
			var second_split = without_resource.split("/");
			var the_site = second_split[0];
			return the_site;
		} catch(e) {
			return false;
		}
	}
	
	var isolate_domain = function(the_site){
		var num_parts = the_site.split(".").length;
		var parts = the_site.split(".");
		if(num_parts > 1){
			the_domain = parts[num_parts-2] + '.' + parts[num_parts-1];
		}
		return the_domain;	
	}	
	
	var is_external = function(the_url){		
		//console.log(the_url);
		the_site = isolate_site(the_url);
		//console.log(the_site);
		if(the_site){
			the_site_domain = isolate_domain(the_site);
			this_domain = isolate_domain(document.domain);
			if(the_site_domain != this_domain){
				return true;
			} else {
				return false;
			}
		} else {
			return false;
		}
	}		
	
	return this.each(function() {
	
		obj = jQuery(this);
		//console.log(obj.attr('href'));
		
		if(is_external(obj.attr('href'))){

			obj.click(function(){
				var thisEl = jQuery(this);	
				
				if(typeof(options.confirmFunction)=='function'){
					var confirm = options.confirmFunction();
				} else {
					var confirm = options.confirmFunction;
				}

				if(confirm){					
					if(typeof(options.beforeLeave)=='function'){
						var beforeLeave = options.beforeLeave();
					} else {
						var beforeLeave = options.beforeLeave;
					}
					
					if(beforeLeave){
						if(options.openNewWindow){
							window.open(thisEl.attr('href'));
							return false;			
						} else {
							return true;
						}
					} else {
						return false;
					}
				} else {
					return false;
				}
				
			});
			
			if(options.addClass){
				obj.addClass(options.addClass);
			}
			
			if(options.addRel){
				obj.attr('rel',options.addRel);
			}
		}
		
	});
 };
})(jQuery);