/**
 * Custom inital load handler. Called when the carousel loads the initial
 * set of data items. Specified to the carousel as the configuration
 * parameter: loadInitHandler
 **/
var loadInitialItems = function(type, args) {

    var start = args[0];
    var last = args[1]; 

    load(this, start, last);    
};

/**
 * Custom load next handler. Called when the carousel loads the next
 * set of data items. Specified to the carousel as the configuration
 * parameter: loadNextHandler
 **/
var loadNextItems = function(type, args) {    

    var start = args[0];
    var last = args[1]; 
    var alreadyCached = args[2];
    
    if(!alreadyCached) {
        load(this, start, last);
    }
};

var handlePrevButtonState = function(type, args) {
};

var handleNextButtonState = function(type, args) {
};

/**
 * Custom load previous handler. Called when the carousel loads the previous
 * set of data items. Specified to the carousel as the configuration
 * parameter: loadPrevHandler
 **/
var loadPrevItems = function(type, args) {
    var start = args[0];
    var last = args[1]; 
    var alreadyCached = args[2];
    
    if(!alreadyCached) {
        load(this, start, last);
    }
};

var load = function(carousel, start, last) {
    for(var i=start;i<=last;i++) {
        carousel.addItem(i, getHTML(front_items[i-1]));
    }
};

var cConfig={
            numVisible:        1,
            animationSpeed:    0.35,
            scrollInc:         1,
            size:              6,
            navMargin:         0,
			wrap:				true,
			autoPlay: 			7000,
			//prevButtonStateHandler:   handlePrevButtonState,
			//nextButtonStateHandler:   handleNextButtonState,
			loadInitHandler:   loadInitialItems,
            loadNextHandler:   loadNextItems,
            loadPrevHandler:   loadPrevItems
};

var currentPage=1;

var setDots = function(pageNum) {
	for(i=1;i<=cConfig.size;i++){
	  YAHOO.util.Dom.removeClass($('car_tab'+i), 'carouselDotGreen');
	  YAHOO.util.Dom.addClass($('car_tab'+i), 'carouselDotGray');
	}
    YAHOO.util.Dom.removeClass($('car_tab'+pageNum), 'carouselDotGray');
	YAHOO.util.Dom.addClass($('car_tab'+pageNum), 'carouselDotGreen');
}

var changePage = function(e, args) {
    var carousel = args[0];
    var pageNum = args[1];
	currentPage=pageNum;
	setDots(pageNum);
    carousel.scrollTo(pageNum);
};

function myScrollNext(e){
  currentPage++;
  currentPage=currentPage>cConfig.size?1:currentPage;
  setDots(currentPage);
  return carousel.scrollNext();

}
function myScrollPrev(e){
  currentPage--;
  currentPage=currentPage<1?cConfig.size:currentPage;
  setDots(currentPage);
  return carousel.scrollTo(currentPage);

}
/**
 * You must create the carousel after the page is loaded since it is
 * dependent on an HTML element (in this case 'dhtml-carousel'.) See the
 * HTML code below.
 **/

var carousel; // for ease of debugging; globals generally not a good idea

var pageLoad = function() 
{
    carousel = new YAHOO.extension.Carousel("dhtml-carousel", cConfig );
    //YAHOO.util.Event.addListener(this.carouselNext, "click", this._scrollNext, this);

    YAHOO.util.Event.addListener("car_tab1", "click", changePage, [carousel, 1]);
    YAHOO.util.Event.addListener("car_tab2", "click", changePage, [carousel, 2]);
    YAHOO.util.Event.addListener("car_tab3", "click", changePage, [carousel, 3]);
    YAHOO.util.Event.addListener("car_tab4", "click", changePage, [carousel, 4]);
    YAHOO.util.Event.addListener("car_tab5", "click", changePage, [carousel, 5]);
    YAHOO.util.Event.addListener("car_tab6", "click", changePage, [carousel, 6]);
    //YAHOO.util.Event.addListener('car_tabL', "click", carousel._scrollPrev, carousel);
    //YAHOO.util.Event.addListener('car_tabR', "click", carousel._scrollNext, carousel);
    YAHOO.util.Event.addListener('car_tabR', "click", myScrollNext);
    YAHOO.util.Event.addListener('car_tabL', "click", myScrollPrev);
};

/**
 * Since carousel.addItem uses an HTML string to create the interface
 * for each carousel item, this method formats the HTML for an LI.
 **/
var fmtItem = function(tabPage) {

      var innerHTML = 
          '<img src="' + 
          tabPage + 
          '"/>';
  
    return innerHTML;
    
};
var getHTML = function(tabPage) {
  var tpl=TrimPath.parseDOMTemplate('carouselTemplate');  
  return tpl.process(tabPage);
    
};


//YAHOO.util.Event.addListener(window, 'load', pageLoad);