/* eslint-disable */
self.addEventListener('install', () => {
  self.skipWaiting();
});
self.addEventListener('activate', (event) => {
  event.waitUntil(self.clients.claim());
});
const map = new Map();
self.onmessage = (event) => {
  if (event.data === 'ping') {
    return;
  }
  const { data } = event;
  const downloadUrl = data.url || `${self.registration.scope + Math.random()}/${typeof data === 'string' ? data : data.filename}`;
  const port = event.ports[0];
  const metadata = new Array(3);
  metadata[1] = data;
  metadata[2] = port;
  if (event.data.readableStream) {
    metadata[0] = event.data.readableStream;
  } else if (event.data.transferringReadable) {
    port.onmessage = (evt) => {
      port.onmessage = null;
      metadata[0] = evt.data.readableStream;
    };
  } else metadata[0] = createStream(port);
  map.set(downloadUrl, metadata);
  port.postMessage({ download: downloadUrl });
};
function createStream(port) {
  return new ReadableStream({
    start(controller) {
      port.onmessage = ({ data }) => {
        if (data === 'end') return controller.close();
        if (data === 'abort') {
          controller.error('Aborted the download');
          return;
        }
        controller.enqueue(data);
      };
    },
    cancel() {
      console.log('user aborted');
    },
  });
}
self.onfetch = (event) => {
  const { url } = event.request;
  if (url.endsWith('/ping')) return event.respondWith(new Response('pong'));
  const hijacke = map.get(url);
  if (!hijacke) return null;
  const [stream, data, port] = hijacke;
  map.delete(url);
  const responseHeaders = new Headers({
    'Content-Type': 'application/octet-stream; charset=utf-8',
    'Content-Security-Policy': "default-src 'none'",
    'X-Content-Security-Policy': "default-src 'none'",
    'X-WebKit-CSP': "default-src 'none'",
    'X-XSS-Protection': '1; mode=block',
  });
  const headers = new Headers(data.headers || {});
  if (headers.has('Content-Length')) {
    responseHeaders.set('Content-Length', headers.get('Content-Length'));
  }
  if (headers.has('Content-Disposition')) {
    responseHeaders.set('Content-Disposition', headers.get('Content-Disposition'));
  }
  if (data.size) {
    console.warn('Depricated');
    responseHeaders.set('Content-Length', data.size);
  }
  let fileName = typeof data === 'string' ? data : data.filename;
  if (fileName) {
    console.warn('Depricated');
    // Make filename RFC5987 compatible
    fileName = encodeURIComponent(fileName).replace(/['()]/g, escape).replace(/\*/g, '%2A');
    responseHeaders.set('Content-Disposition', `attachment; filename*=UTF-8''${fileName}`);
  }
  event.respondWith(new Response(stream, { headers: responseHeaders }));
  port.postMessage({ debug: 'Download started' });
};