/*
News ticker plugin (BBC news style)
Bryan Gullan,2007-2009
version 1.2.2
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').hide();
      
      $(settings.newsList + ' li').each(function(){
        if($(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);