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

// Newsticker Class
at.onepoint.newsticker = Class.create();
at.onepoint.newsticker.prototype = {
    initialize: function()
    {
        // Get elements
        this.interval   = 10000;
        this.container  = $("newsticker");
        if (!this.container) return false;
        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.hideMessages();
        this.current_message = 0;
        this.previous_message = null;
        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);
        })
    },
    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.onepoint.newsticker()}, false);