// Create namespace
if (at == undefined) var at = {};
if (at.bartelme == undefined) at.bartelme = {};

// Newsticker Class
at.bartelme.newsticker = Class.create();
at.bartelme.newsticker.prototype = {
        initialize: function()
        {
                // Get elements
                this.interval = 10000;
                this.container = $("newsticker");
                this.messages  = $A(this.container.getElementsByTagName("li"));
                this.number_of_messages = this.messages.length;
                if (this.number_of_messages == 0)
                {
                        this.showError();
                        return false;
                }
                this.current_message = 0;
                this.previous_message = null;
                // Create toggle button
                this.toggle_button = document.createElement("a");
                this.toggle_button.href = "#";
                this.toggle_button.id = "togglenewsticker";
                this.toggle_button.innerHTML = "Toggle";
                Event.observe(this.toggle_button, "click", this.toggle.bindAsEventListener(this), false);
                this.container.appendChild(this.toggle_button);
                this.hideMessages();
                this.showMessage();
                // Install timer
                this.timer = setInterval(this.showMessage.bind(this), this.interval);
        },
        showMessage: function()
        {
                Effect.Appear(this.messages[this.current_message]);
                setTimeout(this.fadeMessage.bind(this), this.interval-2000);
                if (this.current_message < this.number_of_messages-1)
                {
                        this.previous_message = this.current_message;
                        this.current_message = this.current_message + 1;
                } else {
                        this.current_message = 0;
                        this.previous_message = this.number_of_messages - 1;
                }
        },
        fadeMessage: function()
        {
                Effect.Fade(this.messages[this.previous_message]);
        },
        hideMessages: function()
        {
                this.messages.each(function(message)
                {
                        Element.hide(message);
                })
        },
        toggle: function()
        {
                Effect.BlindUp(this.container, 1000);
        },
        showError: function()
        {
                if (this.container.getElementsByTagName("ul").length == 0)
                {
                        this.list = document.createElement("ul");
                        this.container.appendChild(this.list);
                } else {
                        this.list = this.container.getElementsByTagName("ul")[0];
                }
                this.errorMessage = document.createElement("li");
                this.errorMessage.className = "error";
                this.errorMessage.innerHTML = "Could not retrieve data";
                this.list.appendChild(this.errorMessage);
        }
}

Event.observe(window, "load", function(){new at.bartelme.newsticker()}, false);