(function($) {

// START Reflection object.
// Creates a reflection for underneath an image.
// IE uses an image with IE specific filter properties, other browsers use the Canvas tag.
// The position and size of the reflection gets updated by updateAll() in Controller.
function Reflection(img, reflHeight, opacity) {

var reflection, cntx, imageWidth = img.width, imageHeight = img.width, gradient, parent;

parent = $(img.parentNode);
this.element = reflection = parent.append("<canvas class='reflection' style='position:absolute'/>").find(':last')[0];
if ( !reflection.getContext && $.browser.msie) {
this.element = reflection = parent.append("<img class='reflection' style='position:absolute'/>").find(':last')[0];
reflection.src = img.src;
reflection.style.filter = "flipv progid:DXImageTransform.Microsoft.Alpha(opacity=" + (opacity * 100) + ", style=1, finishOpacity=0, startx=0, starty=0, finishx=0, finishy=" + (reflHeight / imageHeight * 100) + ")";

} else {
cntx = reflection.getContext("2d");
try {


$(reflection).attr({width: imageWidth, height: reflHeight});
cntx.save();
cntx.translate(0, imageHeight-1);
cntx.scale(1, -1);
cntx.drawImage(img, 0, 0, imageWidth, imageHeight);
cntx.restore();
cntx.globalCompositeOperation = "destination-out";
gradient = cntx.createLinearGradient(0, 0, 0, reflHeight);
gradient.addColorStop(0, "rgba(255, 255, 255, " + (1 - opacity) + ")");
gradient.addColorStop(1, "rgba(255, 255, 255, 1.0)");
cntx.fillStyle = gradient;
cntx.fillRect(0, 0, imageWidth, reflHeight);
} catch(e) {
return;
}
}
// Store a copy of the alt and title attrs into the reflection
$(reflection).attr({ 'alt': $(img).attr('alt'), title: $(img).attr('title')} );

} //END Reflection object

// START Item object.
// A wrapper object for items within the carousel.
var Item = function(imgIn, options)
{
this.orgWidth = imgIn.width;
this.orgHeight = imgIn.height;
this.image = imgIn;
this.reflection = null;
this.alt = imgIn.alt;
this.title = imgIn.title;
this.imageOK = false;
this.options = options;

this.imageOK = true;

if (this.options.reflHeight > 0)
{
this.reflection = new Reflection(this.image, this.options.reflHeight, this.options.reflOpacity);
}
$(this.image).css('position','absolute'); // Bizarre. This seems to reset image width to 0 on webkit!
};// END Item object


// Controller object.
// This handles moving all the items, dealing with mouse clicks etc.
var Controller = function(container, images, options)
{
var items = [], funcSin = Math.sin, funcCos = Math.cos, ctx=this;
this.controlTimer = 0;
this.stopped = false;
//this.imagesLoaded = 0;
this.container = container;
this.xRadius = options.xRadius;
this.yRadius = options.yRadius;
this.showFrontTextTimer = 0;
this.autoRotateTimer = 0;
if (options.xRadius === 0)
{
this.xRadius = ($(container).width()/2.3);
}
if (options.yRadius === 0)
{
this.yRadius = ($(container).height()/6);
}

this.xCentre = options.xPos;
this.yCentre = options.yPos;
this.frontIndex = 0; // Index of the item at the front

// Start with the first item at the front.
this.rotation = this.destRotation = Math.PI/2;
this.timeDelay = 1000/options.FPS;

// Turn on the infoBox
if(options.altBox !== null)
{
$(options.altBox).css('display','block');
$(options.titleBox).css('display','block');
}
// Turn on relative position for container to allow absolutely positioned elements
// within it to work.
$(container).css({ position:'relative', overflow:'hidden'} );

$(options.buttonLeft).css('display','inline');
$(options.buttonRight).css('display','inline');

// Setup the buttons.
$(options.buttonLeft).bind('mouseup',this,function(event){
event.data.rotate(-1);
return false;
});
$(options.buttonRight).bind('mouseup',this,function(event){
event.data.rotate(1);
return false;
});

// You will need this plugin for the mousewheel to work: http://plugins.jquery.com/project/mousewheel
if (options.mouseWheel)
{
$(container).bind('mousewheel',this,function(event, delta) {
event.data.rotate(delta);
return false;
});
}
$(container).bind('mouseover click',this,function(event){

clearInterval(event.data.autoRotateTimer); // Stop auto rotation if mouse over.
var text = $(event.target).attr('alt');
// If we have moved over a carousel item, then show the alt and title text.

if ( text !== undefined && text !== null )
{

clearTimeout(event.data.showFrontTextTimer);
$(options.altBox).html( ($(event.target).attr('alt') ));
$(options.titleBox).html( ($(event.target).attr('title') ));
if ( options.bringToFront && event.type == 'click' )
{

var idx = $(event.target).data('itemIndex');
var frontIndex = event.data.frontIndex;
//var diff = idx - frontIndex;
var diff = (idx - frontIndex) % images.length;
if (Math.abs(diff) > images.length / 2) {
diff += (diff > 0 ? -images.length : images.length);
}

event.data.rotate(-diff);
}
}
});
// If we have moved out of a carousel item (or the container itself),
// restore the text of the front item in 1 second.
$(container).bind('mouseout',this,function(event){
var context = event.data;
clearTimeout(context.showFrontTextTimer);
context.showFrontTextTimer = setTimeout( function(){context.showFrontText();},1000);
context.autoRotate(); // Start auto rotation.
});

// Prevent items from being selected as mouse is moved and clicked in the container.
$(container).bind('mousedown',this,function(event){

event.data.container.focus();
return false;
});
container.onselectstart = function () { return false; }; // For IE.

this.innerWrapper = $(container).wrapInner('<div style="position:absolute;width:100%;height:100%;"/>').children()[0];

// Shows the text from the front most item.
this.showFrontText = function()
{
if ( items[this.frontIndex] === undefined ) { return; } // Images might not have loaded yet.
$(options.titleBox).html( $(items[this.frontIndex].image).attr('title'));
$(options.altBox).html( $(items[this.frontIndex].image).attr('alt'));
};

this.go = function()
{
if(this.controlTimer !== 0) { return; }
var context = this;
this.controlTimer = setTimeout( function(){context.updateAll();},this.timeDelay);
};

this.stop = function()
{
clearTimeout(this.controlTimer);
this.controlTimer = 0;
};


// Starts the rotation of the carousel. Direction is the number (+-) of carousel items to rotate by.
this.rotate = function(direction)
{
this.frontIndex -= direction;
this.frontIndex %= items.length;
this.destRotation += ( Math.PI / items.length ) * ( 2*direction );
this.showFrontText();
this.go();
};


this.autoRotate = function()
{
if ( options.autoRotate !== 'no' )
{
var dir = (options.autoRotate === 'right')? 1 : -1;
this.autoRotateTimer = setInterval( function(){ctx.rotate(dir); }, options.autoRotateDelay );
}
};

// This is the main loop function that moves everything.
this.updateAll = function()
{
var minScale = options.minScale; // This is the smallest scale applied to the furthest item.
var smallRange = (1-minScale) * 0.5;
var w,h,x,y,scale,item,sinVal;

var change = (this.destRotation - this.rotation);
var absChange = Math.abs(change);

this.rotation += change * options.speed;
if ( absChange < 0.001 ) { this.rotation = this.destRotation; }
var itemsLen = items.length;
var spacing = (Math.PI / itemsLen) * 2;
//var wrapStyle = null;
var radians = this.rotation;
var isMSIE = $.browser.msie;

// Turn off display. This can reduce repaints/reflows when making style and position changes in the loop.
// See http://dev.opera.com/articles/view/efficie...ascript/?page=3
this.innerWrapper.style.display = 'none';

var style;
var px = 'px', reflHeight;
var context = this;
for (var i = 0; i<itemsLen ;i++)
{
item = items[i];

sinVal = funcSin(radians);

scale = ((sinVal+1) * smallRange) + minScale;

x = this.xCentre + (( (funcCos(radians) * this.xRadius) - (item.orgWidth*0.5)) * scale);
y = this.yCentre + (( (sinVal * this.yRadius) ) * scale);

if (item.imageOK)
{
var img = item.image;
w = img.width = item.orgWidth * scale;
h = img.height = item.orgHeight * scale;
img.style.left = x + px ;
img.style.top = y + px;
img.style.zIndex = "" + (scale * 100)>>0; // >>0 = Math.foor(). Firefox doesn't like fractional decimals in z-index.
if (item.reflection !== null)
{
reflHeight = options.reflHeight * scale;
style = item.reflection.element.style;
style.left = x + px;
style.top = y + h + options.reflGap * scale + px;
style.width = w + px;
if (isMSIE)
{
style.filter.finishy = (reflHeight / h * 100);
}else
{
style.height = reflHeight + px;
}
}
}
radians += spacing;
}
// Turn display back on.
this.innerWrapper.style.display = 'block';

// If we have a preceptable change in rotation then loop again next frame.
if ( absChange >= 0.001 )
{
this.controlTimer = setTimeout( function(){context.updateAll();},this.timeDelay);
}else
{
// Otherwise just stop completely.
this.stop();
}
}; // END updateAll

// Create an Item object for each image
// func = function(){return;ctx.updateAll();} ;

// Check if images have loaded. We need valid widths and heights for the reflections.
this.checkImagesLoaded = function()
{
var i;
for(i=0;i<images.length;i++) {
if ( (images[i].width === undefined) || ( (images[i].complete !== undefined) && (!images[i].complete) ))
{
return;
}
}
for(i=0;i<images.length;i++) {
items.push( new Item( images[i], options ) );
$(images[i]).data('itemIndex',i);
}
// If all images have valid widths and heights, we can stop checking.
clearInterval(this.tt);
this.showFrontText();
this.autoRotate();
this.updateAll();

};

this.tt = setInterval( function(){ctx.checkImagesLoaded();},50);
}; // END Controller object

// The jQuery plugin part. Iterates through items specified in selector and inits a Controller class for each one.
$.fn.CloudCarousel = function(options) {

this.each( function() {

options = $.extend({}, {
reflHeight:0,
reflOpacity:0.5,
reflGap:0,
minScale:0.5,
xPos:0,
yPos:0,
xRadius:0,
yRadius:0,
altBox:null,
titleBox:null,
FPS: 30,
autoRotate: 'no',
autoRotateDelay: 1500,
speed:0.2,
mouseWheel: false,
bringToFront: false
},options );
// Create a Controller for each carousel.
$(this).data('cloudcarousel', new Controller( this, $('.cloudcarousel',$(this)), options) );
});
return this;
};

})(jQuery);