/*
 * onUserExit jQuery Plugin (http://www.userfirstinteractive.com/)
 * @author Scott D. Brooks 
 * @created by UserFirst Interactive (creations@userfirstinteractive.com)
 * 
 * @version 1.1
 * 
 * @changelog
 * v 1.0 	->	Starting release [Dec. 27, 2008]
 * v 1.1 	->	Added support for detection of page refresh through F5 key and ctrl+r. 
				Added support for forms as well, so submissions don't trigger exit event. [Jan. 25, 2010]
 * 
 */
var movingWithinSite 	= false;  // this is the var that determines if the unload was caused by a user leaving, or navigating in the site.
var codeToExecute		= function() {};

function userMovingWithinSite() {
	movingWithinSite = true;
}

// Code to detect refreshing of the page through keyboard use
var ctrlKeyIsDown = false;
function interceptKeyUp(e) {
	if( !e ) {
		if (window.event)
			e = window.event;
		else 
			return;
	}
	
	keyCode = e.keyCode;	
	if (keyCode == 17){
		ctrlKeyIsDown = false;
	}
}

function interceptKeyDown(e) {
	if( !e ) {
		if (window.event)
			e = window.event;
		else
			return;
	}
	
	keyCode = e.keyCode;
	// F5 detected
	if ( keyCode == 116 ) {
		userMovingWithinSite();
	}
	
	if (keyCode == 17){
		ctrlKeyIsDown = true;
	}

	// then they are pressing Ctrl+R
	if (ctrlKeyIsDown && keyCode == 82){	
		userMovingWithinSite();
	}	
}

function interceptKeyPress(e) {
	if( !e ) {
		if (window.event)
			e = window.event;
		else
			return;
	}

	var keyCode = e.keyCode ? e.keyCode : e.which ? e.which : void 0;
	if(e.charCode == null || e.charCode == 0 ) {
		// F5 pressed
		if ( keyCode == 116 ) {
			userMovingWithinSite();
		}
	}
}

function attachEventListener( obj, type, func, capture ) {
	if(window.addEventListener) {
		//Mozilla, Netscape, Firefox
		obj.addEventListener( type, func, capture );
	} else {
		//IE
		obj.attachEvent( 'on' + type, func );
	}
}

(function($) {
    $.fn.onUserExit = function(options) {
        var defaults = {
            execute: "",  // no function assigned by default
            internalURLs: ""		// used to detect whether the url is internal or not (you can add subdomains to this list so when a user hops between sites, they are still considered to be internal.
        };
        var options = $.extend(defaults, options);

        if (options.execute == "") {
            alert("The onUserExit jQuery Plugin has been misconfigured.  Please add the function you wish to execute.");
        }
        if (options.internalURLs == "") {
            alert("The onUserExit jQuery Plugin has been misconfigured.  Please add internal URLs so it know when the user is navigating internally.");
        }
        codeToExecute = options.execute;

        // add onClick function to all internal links
        $("a").each(function() {
            var obj = $(this);
            var linkIsInternal = false;

            var myInternalURLs = options.internalURLs.split("|");

            if (obj.attr("href") != null) {
                for (i = 0; i < myInternalURLs.length; i++) {
                    if (obj.attr("href").indexOf(myInternalURLs[i]) !== -1) {
                        linkIsInternal = true;
                    }
                    // if it's a relative or absolute URL, so it's internal.
                    if (obj.attr("href").indexOf("http://") == -1) {
                        linkIsInternal = true;
                    }
                }
            }

            if (linkIsInternal == true) {
                obj.bind("click", function() {
                    userMovingWithinSite();
                });
            }
        });

        $("form").each(function() {
            var obj = $(this);
            currentonSubmit = obj.attr("onSubmit");
            if (currentonSubmit === undefined) {
                currentonSubmit = "";
            }
            obj.attr("onSubmit", currentonSubmit + " userMovingWithinSite();");
        });

        // for Refresh Detection
        attachEventListener(document, "keydown", interceptKeyDown, true);
        attachEventListener(document, "keyup", interceptKeyUp, true);
        attachEventListener(document, "keypress", interceptKeyPress, true);

    };

    $(window).unload(function() {
        // unloading the page when the user is leaving
        if (movingWithinSite == false) {
            codeToExecute();
        }
    });


})(jQuery);