/**
 * Image src URLs
 */
var imageList = [
                 "images/pic_marriott_1.jpg",
                 "images/pic_marriott_2.jpg",
                 "images/pic_marriott_3.jpg",
				 "images/pic_marriott_4.jpg",
				 "images/pic_marriott_5.jpg",
				 "images/pic_marriott_6.jpg",
                 "images/pic_marriott_7.jpg"
                
                 ];

var lastRan = -1;

var fmtItem = function(imgUrl, url, title, index) {

      var innerHTML = 
          '<a id="dhtml-carousel-a-'+index+'" href="' + 
          url + 
          '"><img id="dhtml-carousel-img-' + index + '" src="' + 
          imgUrl +
        '" width="' +
        150 +
        '" height="' +
        100 +
        '"/>' + 
          title + 
          '<\/a>';
  
    return innerHTML;
};


/**
 * 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);
    }
};

/**
 * 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++) {
        var liItem = carousel.addItem(i, fmtItem(imageList[i], "#", "Number " + i, i));
/*
        // If you want to add handlers for mouse over, mouse out or other events,
        // here is the pattern
        YAHOO.util.Event.addListener(liItem, "mouseover", function(e) {
        //console.log("mouseover>>"+this.id);
        });
        YAHOO.util.Event.addListener(liItem, "mouseout", function(e) {
            //console.log("mouseout<<"+this.id);
        });
*/
    }
}

/**
 * Custom button state handler for enabling/disabling button state. 
 * Called when the carousel has determined that the previous button
 * state should be changed.
 * Specified to the carousel as the configuration
 * parameter: prevButtonStateHandler
 **/
var handlePrevButtonState = function(type, args) {

    var enabling = args[0];
    var leftImage = args[1];
    if(enabling) {
        leftImage.src = "images/left-enabled.gif";    
    } else {
        leftImage.src = "images/left-disabled.gif";
    }
    
};

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

/**
 * 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 pageLoad = function() 
{
    carousel = new YAHOO.extension.Carousel("dhtml-carousel", 
        {
            numVisible:        5,
            animationSpeed:   0.7,
            scrollInc:         1,
            navMargin:         40,
            prevElement:     "prev-arrow",
            nextElement:     "next-arrow",
            loadInitHandler:   loadInitialItems,
            loadNextHandler:   loadNextItems,
            loadPrevHandler:   loadPrevItems,
            prevButtonStateHandler:   handlePrevButtonState,
            autoPlay: 5000,
            size:9,
            wrap:true
        }
    );
    

};
// YAHOO.extension.Carousel.prototype.startAutoPlay = function(interval) {
//         if(this._isValidObj(interval)) {
//             this.autoPlay = interval;
//         }
//         if(this.autoPlayTimer !== null) {
//             return this.autoPlayTimer;
//         }
//         var oThis = this;  
//         var autoScroll = function() { oThis.scrollPrev(); };
//         this.autoPlayTimer = setTimeout( autoScroll, this.autoPlay );
//         return this.autoPlayTimer;
// };
// 
// YAHOO.extension.Carousel.prototype.scrollPrev= function() {
//     this._scrollPrev(null, this);
//     this.autoPlayTimer = null;
//     if(this.autoPlay !== 0) {
//         this.autoPlayTimer = this.startAutoPlay();
//     }
// };
// 
// YAHOO.extension.Carousel.prototype._scrollPrev = function(e, carousel) {
//     if(carousel.scrollPrevAnim.isAnimated()) {
//         return false;
//     }
//     var currStart = carousel.firstVisible;
//     if(carousel.wrap && currStart == 1) {
//         carousel.scrollTo(carousel.size - carousel.numVisible + 1);
//     } else if(e !== null) { // event fired this so disable autoplay
//         carousel.stopAutoPlay();
//         carousel._scrollPrevInc(carousel, carousel.scrollInc, (carousel.getProperty("animationSpeed") !== 0));
//     } else {
//         carousel._scrollPrevInc(carousel, carousel.scrollInc, (carousel.getProperty("animationSpeed") !== 0));
//     }
// };


/**
 * Illustrates stop autoplay
 */
var stopAutoPlay = function(e) {
    YAHOO.util.Dom.get("status").innerHTML = "Auto Play Stopped!";
    carousel.stopAutoPlay();
};

/**
 * Illustrates start autoplay
 */
var startAutoPlay = function(e) {
    YAHOO.util.Dom.get("status").innerHTML = "Auto Play Started!";
    carousel.startAutoPlay(5000);
};

YAHOO.util.Event.addListener(window, 'load', pageLoad);
YAHOO.util.Event.addListener("stop-button", 'click', stopAutoPlay);
YAHOO.util.Event.addListener("start-button", 'click', startAutoPlay);