// remap jQuery to $
(function($){})(window.jQuery);


/* trigger when page is ready */
$(document).ready(function (){

	anchorInt();
	scrollInt();

});

/* Brand Scroller
----------------------------------------*/
function scrollInt() {
	//Callbacks
	function mycarousel_initCallback(carousel) {

		jQuery('#nextButton').bind('click', function() {
			carousel.next();
			return false;
		});
	
		jQuery('#prevButton').bind('click', function() {
			carousel.prev();
			return false;
		});
		
	};
	
	jQuery("#scroller").jcarousel({
        scroll: 1,
        initCallback: mycarousel_initCallback,
        // This tells jCarousel NOT to autobuild prev/next buttons
        buttonNextHTML: null,
        buttonPrevHTML: null
    });	
	
}

/* Page Anchor
----------------------------------------*/
function anchorInt() {
	$('a[href*="#"]').click(function(){
		var a = $(this).attr('href');
		$.scrollTo(a, 1000);
	});
	
}




/* 
	HTML5 CANVAS - BLACK AND WHITE IMAGE EFFECT
*/
jQuery(window).load(function(){
		
		// Fade in images so there isn't a color "pop" document load and then on window load
		jQuery("article div.images a.sub img").fadeIn(300);
		
		// clone image
		jQuery('article div.images a.sub img').each(function(){
			var el = jQuery(this);
			el.css({"position":"absolute"}).wrap("<div class='img_wrapper' style='display: inline-block'>").clone().addClass('img_grayscale').css({"position":"absolute","z-index":"998","opacity":"0"}).insertBefore(el).queue(function(){
				var el = jQuery(this);
				el.parent().css({"width":this.width,"height":this.height});
				el.dequeue();
			});
			this.src = grayscale(this.src);
		});
		
		// Fade image 
		jQuery('article div.images a.sub img').mouseover(function(){
			jQuery(this).parent().find('img:first').stop().animate({opacity:1}, 300);
		})
		jQuery('.img_grayscale').mouseout(function(){
			jQuery(this).stop().animate({opacity:0}, 300);
		});		
	});
	
	// Grayscale w canvas method
	function grayscale(src){
		var canvas = document.createElement('canvas');
		var ctx = canvas.getContext('2d');
		var imgObj = new Image();
		imgObj.src = src;
		canvas.width = imgObj.width;
		canvas.height = imgObj.height; 
		ctx.drawImage(imgObj, 0, 0); 
		var imgPixels = ctx.getImageData(0, 0, canvas.width, canvas.height);
		for(var y = 0; y < imgPixels.height; y++){
			for(var x = 0; x < imgPixels.width; x++){
				var i = (y * 4) * imgPixels.width + x * 4;
				var avg = (imgPixels.data[i] + imgPixels.data[i + 1] + imgPixels.data[i + 2]) / 3;
				imgPixels.data[i] = avg; 
				imgPixels.data[i + 1] = avg; 
				imgPixels.data[i + 2] = avg;
			}
		}
		ctx.putImageData(imgPixels, 0, 0, 0, 0, imgPixels.width, imgPixels.height);
		return canvas.toDataURL();
    }