/**
 * 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>");
			$wrap.css({'overflow': 'hidden', 'position': 'relative', 'width': settings.width, 'text-align': 'left'});
		}
		var $tickerContainer = null;
		if ($ticker.parent().parent().get(0).className != 'container') {
			$tickerContainer = $ticker.parent().wrap("<div class='container'></div>");
			$tickerContainer.css({'overflow': 'hidden', 'position': 'relative', 'width': settings.width});
		}

		$.fn.jStockTicker.settings[settings.tickerID].left = settings.width;		
		var shiftLeftAt = $ticker.children().get(0).offsetWidth;		
		$.fn.jStockTicker.settings[settings.tickerID].shiftLeftAt = shiftLeftAt;
		$.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 = settings.width;
				$ticker.append($ticker.children().get(0));
				params.shiftLeftAt = $ticker.children().get(0).offsetWidth;
			}
			
			$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();
		}		
		$ticker.hover(stopTicker,startTicker);		
		startTicker();
	};

	$.fn.jStockTicker.settings = {};
	
	$.fn.jStockTicker.defaults = {
		tickerID :null,
		url :null,
		speed :1,
		interval :20,
		width: 500
	};
})(jQuery);