/**
 * 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 != 'ticker-wrap') {
			$wrap = $ticker.wrap("<div class='ticker-wrap'></div>");
		}

		var $tickerContainer = null;

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

        if('left' == settings.direction){
            var shiftLeftAt  = $ticker.children().first().outerWidth(true);
            $.fn.jStockTicker.settings[settings.tickerID].shiftLeftAt = shiftLeftAt;
            $.fn.jStockTicker.settings[settings.tickerID].left = 0;
            $.fn.jStockTicker.settings[settings.tickerID].runid = null;
        }else{
           var shiftRightAt = $ticker.children().first().outerWidth(true);

            $.fn.jStockTicker.settings[settings.tickerID].shiftRightAt = shiftRightAt;
            $.fn.jStockTicker.settings[settings.tickerID].right = 0;
            $.fn.jStockTicker.settings[settings.tickerID].runid = null;
        }

		$ticker.width(2 * screen.availWidth);
		
		function startTicker() {
			stopTicker();
			
			var params = $.fn.jStockTicker.settings[settings.tickerID];

            if('left' == settings.direction){
                params.left -= settings.speed;
                if(params.left <= params.shiftLeftAt * -1) {
                    params.left = 0;
                    $ticker.append($ticker.children().get(0));

                    params.shiftLeftAt = $ticker.children().first().outerWidth(true);
                }
                $ticker.css('left', params.left + 'px');
            }else{
                params.right -= settings.speed;
                if(params.right <= params.shiftRightAt * -1) {
                    params.right = 0;
                    $ticker.append($ticker.children().get(0));

                    params.shiftRightAt = $ticker.children().first().outerWidth(true);
                }
                $ticker.css('right', params.right + '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,
        direction: 'left'
	};
})(jQuery);