(function () {
  var deferredPrompt = null;

  window.addEventListener('beforeinstallprompt', function (e) {
    e.preventDefault();
    deferredPrompt = e;
  });

  window.PwaInstall = {
    isInstalled: function () {
      return (
        window.matchMedia('(display-mode: standalone)').matches ||
        window.navigator.standalone === true
      );
    },
    isIos: function () {
      return (
        /iPad|iPhone|iPod/.test(window.navigator.userAgent) &&
        !window.MSStream
      );
    },
    isAndroid: function () {
      return /Android/.test(window.navigator.userAgent);
    },
    canInstall: function () {
      return deferredPrompt !== null;
    },
    promptInstall: function () {
      if (!deferredPrompt) {
        return Promise.resolve(false);
      }
      var prompt = deferredPrompt;
      deferredPrompt = null;
      prompt.prompt();
      return prompt.userChoice.then(function (choice) {
        return choice.outcome === 'accepted';
      });
    },
    getHostname: function () {
      return window.location.hostname;
    },
    isLocalDevHost: function () {
      var host = window.location.hostname;
      return host === 'localhost' || host === '127.0.0.1';
    },
  };
})();