// Variables
var lightbox_baseid = "snap-lightbox-";
var slideshow_baseid = "snap-slideshow-";
//var imageIndex = {1: 1, 2: 1, 3: 1};
var imageIndex  = {}

// Open the Lightbox
function openLightbox(id) {
  document.getElementById(lightbox_baseid + id).style.display = "block";
}

// Close the Lightbox
function closeLightbox(id) {
  document.getElementById(lightbox_baseid + id).style.display = "none";
}

// Next/previous controls for lightbox
function moveLightboxItem(id, n) {
  showLightboxItem(id, imageIndex[id] += n);
}

// Next/previous controls for slideshow
function moveSlideshowItem(id, n) {
  showSlideshowItem(id, imageIndex[id] += n);
}

// Move lightbox to the specified item
function openLightboxItem(id, n) {
  showLightboxItem(id, imageIndex[id] = n);
}

// TODO: Unify these functions
// In the lightbox, make a specific image visible, make others hidden
function showLightboxItem(id, n) {
  var i;
  var lightbox = document.getElementById(lightbox_baseid + id);
  var images = lightbox.querySelectorAll(".snap-lightbox-inner");
  if (n > images.length) { imageIndex[id] = 1 }
  if (n < 1) { imageIndex[id] = images.length }
  for (i = 0; i < images.length; i++) {
    images[i].style.display = "none";
  }
  images[imageIndex[id] - 1].style.display = "inline-block";
}

// In the slideshow, make a specific image visible, make others hidden
function showSlideshowItem(id, n) {
  var i;
  var slideshow = document.getElementById(slideshow_baseid + id);
  var images = slideshow.querySelectorAll(".snap-image");
  if (n > images.length) { imageIndex[id] = 1 }
  if (n < 1) { imageIndex[id] = images.length }
  for (i = 0; i < images.length; i++) {
    images[i].style.display = "none";
  }
  images[imageIndex[id] - 1].style.display = "block";
}