/**
 * Horizontal Stock Ticker for jQuery.
 * 
 * @package jStockTicker
 * @author Peter Halasz <skinner@gmail.com>
 * @license http://www.gnu.org/licenses/gpl-3.0.txt GPL v3.0
 * @copyright (c) 2009, Peter Halasz all rights reserved.
 */
( function($) {

	$.fn.jStockTicker = function(options) {

		if (typeof(options) == 'undefined') options = { };

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

		var $ticker = $(this);

		settings.tickerID = $ticker[0].id;
		
		$.fn.jStockTicker.settings[settings.tickerID] = { };

		var $wrap = null;

		if ($ticker.parent().get(0).className != 'wrap') {
			$wrap = $ticker.wrap("<div class='wrap'></div>");
		}

		var $tickerContainer = null;

		if ($ticker.parent().parent().get(0).className != 'container') {
			$tickerContainer = $ticker.parent().wrap("<div class='container'></div>");
		}
		
		var node = $ticker[0].firstChild;
		var next;
		
		while (node) {
			next = node.nextSibling;
			if (node.NodeType == 3) {
				$ticker[0].removeChild(node);
			}
			node = next;
		}

		var lastPos = parseInt($.cookie('ticker-pos'));
  	while (lastPos < $ticker.children().get(0).offsetWidth * -1) {
	  	lastPos += $ticker.children().get(0).offsetWidth;
			$ticker.append($ticker.children().get(0));
		}
		
		var shiftLeftAt = $ticker.children().get(0).offsetWidth;
		
		$.fn.jStockTicker.settings[settings.tickerID].shiftLeftAt = shiftLeftAt;
		$.fn.jStockTicker.settings[settings.tickerID].left = lastPos;
		$.fn.jStockTicker.settings[settings.tickerID].pos = 0;
		$.fn.jStockTicker.settings[settings.tickerID].posMax = getPosMax();
		$.fn.jStockTicker.settings[settings.tickerID].runid = null;

		$ticker.width(2 * screen.availWidth);
		
		function startTicker() {
			stopTicker();
			
			var params = $.fn.jStockTicker.settings[settings.tickerID];
			params.left -= settings.speed;
			if (params.left <= params.shiftLeftAt * -1) {
				params.left = 0;
				$ticker.append($ticker.children().get(0));
				params.shiftLeftAt = $ticker.children().get(0).offsetWidth;
			}
			
			params.pos -= settings.speed;
			if (params.pos <= params.posMax * -1) {
				params.pos = 0;
			}
			$.cookie('ticker-pos', params.pos);
			
			$ticker.css('left', params.left + 'px');
			params.runId = setTimeout(arguments.callee, settings.interval);
			
			$.fn.jStockTicker.settings[settings.tickerID] = params;
		}
		
		function stopTicker() {
			var params = $.fn.jStockTicker.settings[settings.tickerID];
			if (params.runId) clearTimeout(params.runId);
			    
			params.runId = null;
			
			$.fn.jStockTicker.settings[settings.tickerID] = params;
		}
		
		function updateTicker() {
			stopTicker();
			startTicker();
		}
		
		function getPosMax() {
			var result = 0;
			$ticker.children().map(function() {
				result += this.offsetWidth;
			});
			return result;
		}
		
		$ticker.hover(stopTicker, startTicker);
		
		startTicker();
	};

	$.fn.jStockTicker.settings = { };
	
	$.fn.jStockTicker.defaults = {
		tickerID: null,
		url: null,
		speed: 1,
		interval: 20
	};
	
})(jQuery);