//######
//## This work is licensed under the Creative Commons Attribution-Share Alike 3.0 
//## United States License. To view a copy of this license, 
//## visit http://creativecommons.org/licenses/by-sa/3.0/us/ or send a letter 
//## to Creative Commons, 171 Second Street, Suite 300, San Francisco, California, 94105, USA.
//######

(function($) {
    $.fn.idleTimeout = function(options) {
        var defaults = {
            inactivity: 1200000, //20 Minutes
            noconfirm: 10000, //10 Seconds
            sessionAlive: 30000, //10 Minutes
            redirect_url: '/js_sandbox/',
            click_reset: true,
            alive_url: false,
            logout_url: '/js_sandbox/'
        }

        //##############################
        //## Private Variables
        //##############################
        var opts = $.extend(defaults, options);
        var liveTimeout, confTimeout, sessionTimeout, confInterval;
        var modal = "<div id='modal_pop'><p>You are about to be signed out due to inactivity.</p>Time to logout(in seconds): <div class='noconfirm'>" + opts.noconfirm / 1000 + "</div></div>";
        var confSecLeft;
        //##############################
        //## Private Functions
        //##############################
        var start_liveTimeout = function() {
            clearTimeout(liveTimeout);
            clearTimeout(confTimeout);
            clearInterval(confInterval);
            liveTimeout = setTimeout(logout, opts.inactivity);
            if (opts.sessionAlive) {
                clearTimeout(sessionTimeout);
                sessionTimeout = setTimeout(keep_session, opts.sessionAlive);
            }
        }

        var logout = function() {
            confTimeout = setTimeout(redirect, opts.noconfirm);

            $(modal).dialog({
                buttons: { "Stay Logged In": function() {
                    $(this).dialog('close');
                          }
                },
                open: function(event, ui) {
                    confSecLeft = opts.noconfirm;
                    confInterval = setInterval(updateNoConfirm, 1000);
                },
                close: function() {
                       stay_logged_in();
                },
                modal: true,
                title: 'Auto Logout'
            });

        }

        var redirect = function() {
            if (opts.logout_url) {
                $.get(opts.logout_url);
            }
            window.location.href = opts.redirect_url;
        }

        var stay_logged_in = function(el) {
            start_liveTimeout();
            if (opts.alive_url) {
                $.get(opts.alive_url);
            }
        }

        var keep_session = function() {
            $.get(opts.alive_url);
            clearTimeout(sessionTimeout);
            sessionTimeout = setTimeout(keep_session, opts.sessionAlive);
        }


        var updateNoConfirm = function() {
            var el = $(".noconfirm");
            confSecLeft = confSecLeft - 1000;
            el.html(confSecLeft / 1000);
            el.show();
            el.delay(100).fadeOut(700);
        }


        //###############################
        //Build & Return the instance of the item as a plugin
        // This is basically your construct.
        //###############################
        return this.each(function() {
            obj = $(this);
            start_liveTimeout();
            if (opts.click_reset) {
                $(document).bind('click', start_liveTimeout);
            }
            if (opts.sessionAlive) {
                keep_session();
            }
        });

    };
})(jQuery);