import * as FSAccess from "./store-directory-handle.js";

self.addEventListener('install', ()=> self.skipWaiting()); // Activate worker immediately);
self.addEventListener('activate', ()=> self.clients.claim()); // Become available to all pages);
self.addEventListener('fetch', (event) =>event.respondWith(Interceptor(event)));

let handle = false;
async function Interceptor(event)
{
  const url = new URL(event.request.url);
  const pathname = url.pathname.substring(1)
  const extension = pathname.substring(pathname.lastIndexOf('.') + 1);

  // Intercept only JavaScript files
  if ( extension == "js" || extension == "json" )
  {
    console.log('[Service Worker] Intercepted JS request:', url.href);
    if(!handle)
    {
      handle = await FSAccess.getDirectoryHandle();
    }
    if(handle)
    {
      try
      {
        const parts = pathname.split("/");
        let filePointer = handle;
        for(let i=0; i<parts.length-1; i++)
        {
          filePointer = await filePointer.getDirectoryHandle(parts[i], {create: false});
        }
        filePointer = await filePointer.getFileHandle(parts[parts.length-1], {create: false});
        const file = await filePointer.getFile();
        const content = await file.text();
        return new Response(content, {
          headers: {
            'Content-Type': 'application/javascript',
            'Cache-Control': 'no-cache'
          }
        });
      }
      catch(e)
      {
        return fetch(event.request);
      }

    }
  }
  else
  {
    return fetch(event.request);
  }
}