/**
 *
 */

window.onload = init;

function init() {
  initializeHover("header nav img");
  fadeImage("header nav .menu_option");
  
  specificInit();
}

function specificInit() {}
 
// 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 + 25;
			imgPixels.data[i + 2] = avg;
		}
	}
	ctx.putImageData(imgPixels, 0, 0, 0, 0, imgPixels.width, imgPixels.height);
	return canvas.toDataURL();
}

function initializeHover(object) {
  // Fade in images so there isn't a color "pop" document load and then on window load
	$(object).fadeIn(500);

	// clone image
	$(object).each(function() {
		var el = $(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 = $(this);
			el.parent().css({"width":this.width,"height":this.height});
			el.dequeue();
		});
		this.src = grayscale(this.src);
	});

	// Fade image
	$(object).mouseover(function() {
		$(this).parent().find('img:first').stop().animate({opacity:1}, 1000);
	});
	$('.img_grayscale').mouseout(function() {
		$(this).stop().animate({opacity:0}, 1000);
	});
}
    
function fadeImage(object) {
  $(object).mouseover(function() {
    $(this).find('img:first').stop().animate({opacity:1}, 1000);
	});
	
	$(object).mouseout(function() {
    $(this).find('img:first').stop().animate({opacity:0}, 1000);
	});
}

function imageDescription(object) {
  $(object).show(); 
  $(object).animate({ opacity: 0.85 }, 1 );
}

function imageDescriptionHover(container) {
  header = "header h2:first";
  description = "section p:first";
  image = "section img:first";
  date = "footer p:first";
  
  $(container).mouseover(function() {
    $(this).find(header).hide();
    //$(this).find(header).css("text-align", "left");
    $(this).find(header).css("color", "#729f48");
    $(this).find(header).css("top", "165px");
    $(this).find(image).css("-moz-box-shadow", "1px 1px 5px #333");
    $(this).find(image).css("-webkit-box-shadow", "1px 1px 5px #333");
    $(this).find(image).css("box-shadow", "1px 1px 5px #333");
    //imageDescription(container + " " + header);
    $(this).find(header).show();
    $(this).find(header).animate({ opacity: 0.85 }, 1 );
    //imageDescription(container + " " + description);
    $(this).find(description).show();
    $(this).find(description).animate({ opacity: 0.85 }, 1 );
    //imageDescription(container + " " + date);
    $(this).find(date).show();
    $(this).find(date).animate({ opacity: 0.85 }, 1 );
	});
  $(container).mouseout(function() {
	$(this).find(header).show();
	$(this).find(header).animate({ opacity: 0.85 }, 1 );
   // $(this).find(header).css("text-align", "right");
    $(this).find(header).css("color", "#999");
    $(this).find(header).css("top", "150px");
    $(this).find(image).css("-moz-box-shadow", "none");
    $(this).find(image).css("-webkit-box-shadow", "none");
    $(this).find(image).css("box-shadow", "none");
    $(this).find(description).hide();
    $(this).find(date).hide();
	});
}