(function (window, undefined) {
  window.addEventListener('DOMContentLoaded', () => {

    if (!('serviceWorker' in navigator)) {
      console.log('service workers not supported 😣')
      return
    }

    let initialized = false;
    const initialize = () => {
      initialized = true;
    };

    navigator.serviceWorker.register('serviceworker.js', {scope: "/"}).then(
      (reg) => {
        if(reg.installing) {
          console.log('Service worker installing');
          setTimeout(() => {
            window.location = window.location.origin+window.location.pathname;
          }, 200);
        } else if(reg.waiting) {
          console.log('Service worker installed');
          if(!initialized) {
            initialize();
          }
        } else if(reg.active) {
          console.log('Service worker active');
          if(!initialized) {
            initialize();
          }
        }
      },
      err => {
        console.error('service worker registration failed! 😱', err)
      }
    );

    navigator.serviceWorker.addEventListener('message', event => {
      if(event.data.log) {
        console.log(`serviceworker: ${event.data.log}`);
      }
    });

    
  });
})(window);