//
// CSS Photo Shuffler v1.0 by
//   Carl Camera
//   http://iamacamera.org 
//
// SetOpacity Function and inpiration from Photo Fade by
//   Richard Rutter
//   http://clagnut.com
//
// License: Creative Commons Attribution 2.5  License
//   http://creativecommons.org/licenses/by/2.5/
//

// Customize your photo shuffle settings
// 
// * Surround the target <img /> with a <div>. specify id= in both
// * set background-repeat:no-repeat in CSS for the div
// * The first and final photo displayed is in the html <img> tag
// * The array contains paths to photos you want in the rotation. 
//   If you want the first photo in the rotation, then it's best to
//   put it as the final array image.  All photos must be same dimension
// * The rotations variable specifies how many times to repeat array.
//   images. zero is a valid rotation value.

var gblPhotoShufflerDivId = "middle-img";
var gblPhotoShufflerImgId = "photoimg"; 

// different photo display order depending on the page loaded...
// get the custom attibute 'data' from the src tag
var photoId = document.getElementById('photo').getAttribute('data'); 
var img1 = "./img/gym001.jpg";
var img2 = "./img/gym002.jpg";
var img3 = "./img/gym003.jpg";
var img4 = "./img/gym004.jpg";
var img5 = "./img/gym005.jpg";
var img6 = "./img/gym006.jpg";
var img7 = "./img/gym007.jpg";
var img8 = "./img/gym008.jpg";
var img9 = "./img/gym009.jpg";
var img10 = "./img/gym010.jpg";
var img11 = "./img/gym011.jpg";
var img12 = "./img/gym012.jpg";
var img13 = "./img/gym013.jpg";
var img14 = "./img/gym014.jpg";

switch(photoId) {
	case "index":
		var gblImg = new Array(img2, img3, img4, img5, img6, img7, img8, img9);
		break;
	case "facilities":
		var gblImg = new Array(img4, img5, img6, img7, img8, img9, img10, img11);
		break;
	case "membership":
		var gblImg = new Array(img6, img7, img8, img9, img10, img11, img12, img13);
		break;
	case "classes":
		var gblImg = new Array(img8, img9, img10, img11, img12, img13, img14, img1);
		break;
	case "booking":
		var gblImg = new Array(img10, img11, img12, img13, img14, img1, img2, img3);
		break;
	case "contact":
		var gblImg = new Array(img12, img13, img14, img1, img2, img3, img4, img5);
		break;
	case "sitemap":
		var gblImg = new Array(img14, img1, img2, img3, img4, img5, img6, img7);
		break;
	default:
		alert("Error");
		break;
}

// change the array order

//var gblImg = new Array("./img/gym002.jpg","./img/gym003.jpg","./img/gym004.jpg","./img/gym005.jpg","./img/gym006.jpg","./img/gym007.jpg","./img/gym008.jpg","./img/gym009.jpg");
var gblPauseSeconds = 7.25;
var gblFadeSeconds = .85;
var gblRotations = 1;

// End Customization section

var gblDeckSize = gblImg.length;
var gblOpacity = 100;
var gblOnDeck = 0;
var gblStartImg;
var gblImageRotations = gblDeckSize * (gblRotations+1);

window.onload = photoShufflerLaunch;

function photoShufflerLaunch()
{
	var theimg = document.getElementById(gblPhotoShufflerImgId);
		gblStartImg = theimg.src; // save away to show as final image
	
	document.getElementById(gblPhotoShufflerDivId).style.backgroundImage='url(' + gblImg[gblOnDeck] + ')';
	setTimeout("photoShufflerFade()",gblPauseSeconds*1000);
}

function photoShufflerFade()
{
	var theimg = document.getElementById(gblPhotoShufflerImgId);
	
	// determine delta based on number of fade seconds
	// the slower the fade the more increments needed
		var fadeDelta = 100 / (30 * gblFadeSeconds);
	
	// fade top out to reveal bottom image
	if (gblOpacity < 2*fadeDelta ) {
		gblOpacity = 100;
		// stop the rotation if we're done
		if (gblImageRotations < 1) return;
		photoShufflerShuffle();
		// pause before next fade
		setTimeout("photoShufflerFade()",gblPauseSeconds*1000);
	} else {
		gblOpacity -= fadeDelta;
		setOpacity(theimg,gblOpacity);
		setTimeout("photoShufflerFade()",30);  // 1/30th of a second
	}
}

function photoShufflerShuffle() {
	var thediv = document.getElementById(gblPhotoShufflerDivId);
	var theimg = document.getElementById(gblPhotoShufflerImgId);
	
	// copy div background-image to img.src
	theimg.src = gblImg[gblOnDeck];
	// set img opacity to 100
	setOpacity(theimg,100);
	
		// shuffle the deck
	gblOnDeck = ++gblOnDeck % gblDeckSize;
	// decrement rotation counter
	if (--gblImageRotations < 1) {
	  // insert start/final image if we're done
	  gblImg[gblOnDeck] = gblStartImg;
	}
	
	// slide next image underneath
	thediv.style.backgroundImage='url(' + gblImg[gblOnDeck] + ')';
}

function setOpacity(obj, opacity) {
	opacity = (opacity == 100)?99.999:opacity;
	
	// IE/Win
	obj.style.filter = "alpha(opacity:"+opacity+")";
	
	// Safari<1.2, Konqueror
	obj.style.KHTMLOpacity = opacity/100;
	
	// Older Mozilla and Firefox
	obj.style.MozOpacity = opacity/100;
	
	// Safari 1.2, newer Firefox and Mozilla, CSS3
	obj.style.opacity = opacity/100;
}