//////////////////////////////////////////////////////////////////////////////////
// CloudCarousel V1.0.3
// (c) 2010 by R Cecco. <http://www.professorcloud.com>
// MIT License
//
// Reflection code based on plugin by Christophe Beyls <http://www.digitalia.be>
//
// Please retain this copyright header in all versions of the software
//////////////////////////////////////////////////////////////////////////////////

(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 = $(img.parentNode);
        if ($.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 {    
            
            this.element = reflection = parent.append("<canvas class='reflection' style='position:absolute'/>").find(':last')[0];           
            if (!reflection.getContext)
            {
                return;         
            }
            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',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 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'));

            $('#carousel-text-content').html('');

            $('#carousel-text-content').prepend( '<p>'+$('#carousel-cont span.car-text-'+this.frontIndex).html()+'</p>' );
            $('#carousel-text-content').prepend( '<h2>'+ $('#carousel-header').text() +'</h2>' );
        };
                        
        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 to the neigbouring item.
        this.rotate = function(direction)
        {   
            this.frontIndex -= direction;
            // Keep a note of the item at the front.
            if (this.frontIndex<0) { this.frontIndex = items.length-1; }
            if (this.frontIndex > items.length-1) { this.frontIndex=0; }
            // 
            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/efficient-javascript/?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 ) );                
            }
            // 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
            },options );                                    
            // Create a Controller for each carousel.       
            $(this).data('cloudcarousel', new Controller( this, $('.cloudcarousel',$(this)), options) );
        });             
        return this;
    };

})(jQuery);