/**
 * Respond with whatever Google gives us
 * @param {Request} request
 */
async function handleRequest(request) {
  let response;
  try {
    const prefix = 'https://calendar.google.com/calendar/ical';
    let postscript = '/public/basic.ics';
    let requestPath = new URL(request.url).pathname;
    if (requestPath.endsWith('/')) {
      requestPath = requestPath.substring(0, requestPath.length - 1);
    }
    if (requestPath.search('/private-') >= 0) {
      postscript = '/basic.ics';
    }
    const googleCal = `${prefix}${requestPath}${postscript}`;
    response = await fetch(googleCal);
  } catch (err) {
    // Without event.waitUntil(), our fetch() to our logging service may
    // or may not complete.
    // event.waitUntil(postLog(err));
    const stack = JSON.stringify(err.stack) || err;
    // Copy the response and initialize body to the stack trace
    response = new Response(stack, response);
    // Shove our rewritten URL into a header to find out what it was.
    response.headers.set('X-Debug-stack', stack);
    response.headers.set('X-Debug-err', err);
  }
  return response;
}

// This is "browser", but it's running in a V8 isolate, so it's really
// neither browser nor node. This is the hook into the CF Worker ecosystem,
// so we need to have this code and is safe to disable eslint for this line
addEventListener('fetch', (event) => { // eslint-disable-line no-restricted-globals
  event.respondWith(handleRequest(event.request));
});