/*
News ticker plugin (BBC news style)
Bryan Gullan,2007-2009
version 1.2
updated 2009-02-15
http://www.makemineatriple.com/jquery
Use and distrubute freely with this header

Options (defaults shown):
newsList: "#news"         // assumes unordered list; specify the ul holding the news items
tickerRate: 80                 // time gap between display of each letter (ms)
startDelay: 100         // delay before first run of the ticker (ms)
loopDelay: 3000         // time for which full text of each item is shown at end of print-out (ms)
placeHolder1: " |"        // character placeholder shown on even loops
placeHolder2: "_"        // character placeholder shown on odd loops

Sample usage:
$(document).ready(function() {
        var options = {
                  newsList: "#news",
                 startDelay: 10,
                 placeHolder1: " []"
        }
        $().newsTicker(options);
});

for markup as follows:

<ul id="news">
<li><a href="http://www.makemineatriple.com">MakeMineATriple.com</a></li>
<li><a href="http://www.jquery.com">jQuery</a></li>
</ul>

Underline text decoration on the link is not recommended! :-)

*/

(function($) {

        function runTicker(settings) {
                if(settings.firstRun == 1){
                        currentLength = settings.currentLength;
                        currentItem = settings.currentItem;
                        settings.firstRun = 0;
                }
                if(currentItem == settings.newsItemCounter + 1){
                        currentItem = 0;
                }

                if(currentLength == 0) {
                        if(settings.newsLinks[currentItem].length > 0) {
                                $(settings.newsList).empty().append('<li><a href="'+ settings.newsLinks[currentItem] +'"></a></li>');
                        }
                        else {
                                $(settings.newsList).empty().append('<li></li>');
                        }
                }

                if( currentLength % 2 == 0) {
                                placeHolder = settings.placeHolder1;
                }
                else {
                        placeHolder = settings.placeHolder2;
                }

                if( currentLength <= settings.newsItems[currentItem].length + 1) {
                        var tickerText = settings.newsItems[currentItem].substring(0,currentLength);
                        if(settings.newsLinks[currentItem].length > 0) {
                                $(settings.newsList + ' li a').text(tickerText + placeHolder);
                        }
                        else {
                                $(settings.newsList + ' li').text(tickerText + placeHolder);
                        }
                        currentLength ++;
                        setTimeout(function(){runTicker(settings); settings = null;},settings.tickerRate);
                }
                else {
                        if(settings.newsLinks[currentItem].length > 0) {
                                $(settings.newsList + ' li a').text(settings.newsItems[currentItem]);
                        }
                        else {
                                $(settings.newsList + ' li').text(settings.newsItems[currentItem]);
                        }
                        currentLength = 0;
                        currentItem ++;
                        setTimeout(function(){runTicker(settings); settings = null;},settings.loopDelay);
                }
        }

        $.fn.extend({
                newsTicker: function(settings) {
                        settings = jQuery.extend({
                                   newsList: "#news",
                                   tickerRate: 80,
                            startDelay: 100,
                            loopDelay: 3000,
                            placeHolder1: " |",
                            placeHolder2: "_"
                        }, settings);

                        var newsItems = new Array();
                        var newsLinks = new Array();
                        var newsItemCounter = 0;

                        $(settings.newsList + ' li').each(function(){
                                if($(this).children('a').length) {
                                        newsItems[newsItemCounter] = $(this).children('a').text();
                                        newsLinks[newsItemCounter] = $(this).children('a').attr('href');
                                }
                                else {
                                        newsItems[newsItemCounter] = $(this).text();
                                        newsLinks[newsItemCounter] = '';
                                }
                                newsItemCounter ++;
                        });

                        settings = jQuery.extend(settings,{
                                newsItems: newsItems,
                                newsLinks: newsLinks,
                                newsItemCounter: newsItemCounter - 1,
                                currentItem: 0,
                                currentLength: 0,
                                firstRun:1
                        });

                        setTimeout(function(){runTicker(settings); settings = null;},settings.startDelay);
                }

        });


})(jQuery);