(function ($) {
    var template;
    var counter = 0;

    $.notifications = function (msg, options) {
        counter++;

        var settings = $.extend({}, $.notifications.defaults, options);

        if (!template) {
            template = $('<div id="jquery-notifications"></div>').prependTo(document.body);
        }

        var n = $('<p class="' + settings.type + '" id="jquery-notifications-' + counter + '">' + msg + '</p>').hide().appendTo("#jquery-notifications");
        if (settings.effect == "fade") {
            n.fadeIn(settings.fadeSpeed);
        } else {
            n.slideDown(settings.fadeSpeed);
        }

        if (settings.stick) {
            var close = $('<a href="javascript:void(0);">' + settings.close + '</a>').click(function () {
                if (settings.effect == "fade") {
                    $(this.parentNode).fadeOut(settings.fadeSpeed, function () {
                        $(this).remove();
                    });
                }
                else {
                    $(this.parentNode).slideUp(settings.fadeSpeed, function () {
                        $(this).remove();
                    });
                }
            });
            close.appendTo(n);
        }

        if (!settings.stick) {
            var notificationsDelayer = delayTimer(settings.timeout);
            notificationsDelayer(update, { counter: counter, effect: settings.effect, fadeSpeed: settings.fadeSpeed });
        }

        if ($("#errorExplanation").length) {
            // if there exists an errorExplanation div from rails 3.0,
            // hide the errors and list them down as notifications
            $("#errorExplanation").hide();
            $("#errorExplanation li").each(function (index) {
                $.n.error($(this).text());
            })
        }
    };

    $.notifications.success = function (msg, options) {
        return $.notifications(msg, $.extend({}, options, { type: "success" }));
    };

    $.notifications.error = function (msg, options) {
        return $.notifications(msg, $.extend({ stick: true }, options, { type: "error" }));
    };

    $.notifications.warning = function (msg, options) {
        return $.notifications(msg, $.extend({}, options, { type: "warning" }));
    };

    function update(params) {
        if (params.effect == "fade") {
            $("#jquery-notifications-" + params.counter).fadeOut(params.fadeSpeed, function () {
                $(this).remove();
            });
        } else {
            $("#jquery-notifications-" + params.counter).slideUp(params.fadeSpeed, function () {
                $(this).remove();
            });
        }
    }

    function delayTimer(delay) {
        var timer;
        return function (fn, params) {
            timer = clearTimeout(timer);
            if (fn)
                timer = setTimeout(function () {
                    fn(params);
                }, delay);
            return timer;
        };
    }

    $.notifications.defaults = {
        type: "notice",
        timeout: 10000,
        stick: false,
        fadeSpeed: 800,
        close: "x",
        effect: "fade"
    };

    $.n = $.notifications;

})(jQuery);