/*
News ticker plugin (BBC news style)
Bryan Gullan,2007-2010
version 2.2
updated 2010-04-04
Documentation at http://www.makemineatriple.com/news-ticker-documentation/
Demo at http://www.makemineatriple.com/jquery/?newsTicker
Use and distrubute freely with this header intact.
*/

(function($) {
  
  var name='newsTicker';
  
  function runTicker(settings) {
    
    tickerData = $(settings.newsList).data('newsTicker');
    
    if(tickerData.currentItem > tickerData.newsItemCounter){
      // if we've looped to beyond the last item in the list, start over
      tickerData.currentItem = 0;
    }
    else if (tickerData.currentItem < 0) {
      // if we've looped back before the first item, move to the last one
      tickerData.currentItem = tickerData.newsItemCounter;
    }
    
    if(tickerData.currentPosition == 0) {
      if(tickerData.newsLinks[tickerData.currentItem].length > 0) {
        $(tickerData.newsList).empty().append('<li><a href="'+ tickerData.newsLinks[tickerData.currentItem] +'"></a></li>');
      }
      else {
        $(tickerData.newsList).empty().append('<li></li>');
      }
    }
    
    //only start the ticker itself if it's defined as animating: otherwise it's paused or under manual advance
    if (tickerData.animating) {
      
      if( tickerData.currentPosition % 2 == 0) {
          var placeHolder = tickerData.placeHolder1;
      }
      else {
        var placeHolder = tickerData.placeHolder2;
      }
      
      if( tickerData.currentPosition < tickerData.newsItems[tickerData.currentItem].length) {
        // we haven't completed ticking out the current item
        
        var tickerText = tickerData.newsItems[tickerData.currentItem].substring(0,tickerData.currentPosition);
        if(tickerData.newsLinks[tickerData.currentItem].length > 0) {
          $(tickerData.newsList + ' li a').text(tickerText + placeHolder);
        }
        else {
          $(tickerData.newsList + ' li').text(tickerText + placeHolder);
        }
        tickerData.currentPosition ++;
        setTimeout(function(){runTicker(settings); settings = null;},tickerData.tickerRate);
      }
      
      else {
        // we're on the last letter of the current item
        
        if(tickerData.newsLinks[tickerData.currentItem].length > 0) {
          $(tickerData.newsList + ' li a').text(tickerData.newsItems[tickerData.currentItem]);
        }
        else {
          $(tickerData.newsList + ' li').text(tickerData.newsItems[tickerData.currentItem]);
        }
        
        setTimeout(function(){
          if (tickerData.animating) {
            tickerData.currentPosition = 0;
            tickerData.currentItem ++;
            runTicker(settings); settings = null;
          }
        },tickerData.loopDelay);
        
      }
    }
    
    else {// settings.animating == false 
      
      // display the full text of the current item
      var tickerText = tickerData.newsItems[tickerData.currentItem];
      
      if(tickerData.newsLinks[tickerData.currentItem].length > 0) {
        $(tickerData.newsList + ' li a').text(tickerText);
      }
      else {
        $(tickerData.newsList + ' li').text(tickerText);
      }
          
    }
    
  }

  
  // Core plugin setup and config
  jQuery.fn[name] = function(options) {
 
      // Add or overwrite options onto defaults
      var settings = jQuery.extend({}, jQuery.fn.newsTicker.defaults, options);
   
        var newsItems = new Array();
    var newsLinks = new Array();
    var newsItemCounter = 0;
    
    // Hide the static list items
    $(settings.newsList + ' li').hide();
    
    // Store the items and links in arrays for output
    $(settings.newsList + ' li').each(function(){
      if($(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 ++;
    });
        
        var tickerElement = $(settings.newsList); // for quick reference below
        
        tickerElement.data(name, {
          newsList: settings.newsList,
      tickerRate: settings.tickerRate,
      startDelay: settings.startDelay,
      loopDelay: settings.loopDelay,
      placeHolder1: settings.placeHolder1,
      placeHolder2: settings.placeHolder2,
      controls: settings.controls,
      ownControls: settings.ownControls,
      stopOnHover: settings.stopOnHover,
            newsItems: newsItems,
      newsLinks: newsLinks,
      newsItemCounter: newsItemCounter - 1, // -1 because we've incremented even after the last item (above)
      currentItem: 0,
      currentPosition: 0,
      firstRun:1
        })
        .bind({
      stop: function(event) {
        // show remainder of the current item immediately
          tickerData = tickerElement.data(name);
          if (tickerData.animating) { // only stop if not already stopped
                tickerData.animating = false;
                }
        },
        play: function(event) {
          // show 1st item with startdelay
          tickerData = tickerElement.data(name);
          if (!tickerData.animating) { // if already animating, don't start animating again
                tickerData.animating = true;
                setTimeout(function(){runTicker(tickerData); tickerData = null;},tickerData.startDelay);
              }
        },
        resume: function(event) {
          // start from next item, with no delay
          tickerData = tickerElement.data(name);
          if (!tickerData.animating) { // if already animating, don't start animating again
                tickerData.animating = true;
                // set the character position as 0 to ensure on resume we start at the right point
          tickerData.currentPosition = 0;
                tickerData.currentItem ++;
                runTicker(tickerData); // no delay when resuming.
            }
        },
        next: function(event) {
          // show whole of next item
          tickerData = tickerElement.data(name);
          // stop (which sets as non-animating), and call runticker
          $(tickerData.newsList).trigger("stop");
          // set the character position as 0 to ensure on resume we start at the right point
        tickerData.currentPosition = 0;
              tickerData.currentItem ++;
              runTicker(tickerData);
        },
        previous: function(event) {
        // show whole of previous item
        tickerData = tickerElement.data(name);
          // stop (which sets as non-animating), and call runticker
          $(tickerData.newsList).trigger("stop");
          // set the character position as 0 to ensure on resume we start at the right point
        tickerData.currentPosition = 0;
              tickerData.currentItem --;
              runTicker(tickerData);
      }
    });   
    if (settings.stopOnHover) {
        tickerElement.bind({            
          mouseover: function(event) {
            tickerData = tickerElement.data(name);
            if (tickerData.animating) { // stop if not already stopped
              $(tickerData.newsList).trigger("stop");
              if (tickerData.controls) { // ensure that the ticker can be resumed if controls are enabled
                $('.stop').hide();
                  $('.resume').show();
              }
            }
          }
      });
      }
      
      tickerData = tickerElement.data(name);
      
      // set up control buttons if the option is on
    if (tickerData.controls || tickerData.ownControls) {
      if (!tickerData.ownControls) {
        $('<ul class="ticker-controls"><li class="play"><a href="#play">Play</a></li><li class="resume"><a href="#resume">Resume</a></li><li class="stop"><a href="#stop">Stop</a></li><li class="previous"><a href="#previous">Previous</a></li><li class="next"><a href="#next">Next</a></li></ul>').insertAfter($(tickerData.newsList));
      }
      $('.play').hide();
        $('.resume').hide();
      
        $('.play').click(function(event){
            $(tickerData.newsList).trigger("play");
            $('.play').hide();
            $('.resume').hide();
            $('.stop').show();
            event.preventDefault();
        });
        $('.resume').click(function(event){
            $(tickerData.newsList).trigger("resume");
            $('.play').hide();
            $('.resume').hide();
            $('.stop').show();
            event.preventDefault();
        });
      $('.stop').click(function(event){
            $(tickerData.newsList).trigger("stop");
            $('.stop').hide();
            $('.resume').show();
            event.preventDefault();
        });
        $('.previous').click(function(event){
            $(tickerData.newsList).trigger("previous");
            $('.stop').hide();
          $('.resume').show();
            event.preventDefault();
        });
        $('.next').click(function(event){
            $(tickerData.newsList).trigger("next");
            $('.stop').hide();
          $('.resume').show();
            event.preventDefault();
        });

      };
      
      // tell it to play
      $(tickerData.newsList).trigger("play");
  };

  // News ticker defaults 
  jQuery.fn[name].defaults = {
      newsList: "#news",
    tickerRate: 80,
    startDelay: 100,
    loopDelay: 3000,
    placeHolder1: " |",
    placeHolder2: "_",
    controls: true,
    ownControls: false,
    stopOnHover: true
  }

})(jQuery);