let url = window.location.href;

if(url.includes("products_in_scene.php")) {
   //replace the url encoding
   url = url.replaceAll("%3B", ";");

   const roomPids = getPidsInUrl(url);

   let visiblePids = getPidsDisplayedOnPage();
   let hiddenPids = [];

   if(visiblePids.length > 0) {
      roomPids.forEach((pid) => {
         if(!visiblePids.includes(pid)) {
            hiddenPids.push(pid);
         }
      });
   }

   displayPids(hiddenPids);
}

function displayPids(pids) {
   let output = "";

   if(pids.length) {
      output += "Hidden Pids:";
      output += "\n";
      output += pids.join("\r\n");
   } else {
      output += "No hidden pids found";
   }

   alert(output);
}

/**
 * Returns an array of pids from the links on the page.
 *
 * @param {string} pisUrl The products in scene url.
 * @return {array} pids formatted.
 */
function getPidsDisplayedOnPage() {
   let links = document.querySelectorAll(".thumbnail-link");
   let visiblePids = [];

   if(links.length > 0) {
      links.forEach((link) => {
         //strip array the irrelevant data leaving the pid behind
         let pid = link.href.split("products_id=")[1];

         if(pid) {
            visiblePids.push(pid);
         }
      });
   }

   return visiblePids;
}

/**
 * Returns an array of pids from the url.
 *
 * @param {string} pisUrl The products in scene url.
 * @return {array} pids formatted.
 */
function getPidsInUrl(pisUrl) {
   let pids = pisUrl.split('?')[1];

   if (pids.startsWith("room=")) {
      pids = pisUrl.split('&avatar')[0];
      pids = pids.replace("https://www.imvu.com/catalog/products_in_scene.php?room=", "");
      pids = pids.split(';');
   } else if (pids.startsWith("avatar")) {
      let urlParts = pids.split('&');
      for (i = 0; i < urlParts.length; ++i) {
         if(urlParts[i].startsWith("room=")) {
            pids = urlParts[i];
            break;
         }
      }
      pids = pids.replace("room=", "");
      pids = pids.split(';');
   }

   return cleanPids(pids);
}

/**
 * Returns an array of pids with the counter removed.
 *
 * @param {array} pids The products in scene url.
 * @return {array} pids without the x counter.
 */
function cleanPids(dirtyPids) {
   let buffer = [];

   for (i = 0; i < dirtyPids.length; ++i) {
      let cleanPid = dirtyPids[i];
      if(cleanPid.includes("x")) {
         cleanPid = cleanPid.split('x')[0];
      }
      buffer.push(cleanPid);
   }

   return buffer;
}