define([], () => {
  'use strict';

  class StartModule {
  }
  
  StartModule.prototype.preview = function(blob) {

    var reader = new FileReader();
    var url;
    if (blob) {
      reader.onload = function(e) {

        url = window.URL.createObjectURL(blob);
        console.log("url is");
        console.log(url);
        document.getElementById("navigation-bar-avatar").src = url;
      };
      reader.readAsDataURL(blob);
    }
  };
  
  StartModule.prototype.TruncateUserName = function(Username) {
    Username = Username.slice(2);
    console.log(Username);
    return Username;
  };
  
   StartModule.prototype.GetInitials = function(Fullname) {
    var initials = Fullname.match(/\b\w/g) || [];
    initials = ((initials.shift() || '') + (initials.pop() || '')).toUpperCase();
    console.log(initials);
    return initials;
  };
  
  StartModule.prototype.ClearImage = function() {
    document.getElementById("navigation-bar-avatar").src = '';
  };
  
  StartModule.prototype.spinnerOn = function() {
    $("#vb-spinner").css("display", "block");
    $("#vb-spinner").show(); // working
    $("#myDiv").hide();

  };

  /**
   * Handler for PWA 'Add' button click on PWA 'add to home screen' popup
   * @return {Promise<boolean>}
   */
  StartModule.prototype.addPWA = function (installPromptEventPayload){
    // First close the popup through synchronous call
    document.getElementById('pwaAddToHomeScreen').close();
    var installPromptEvent = installPromptEventPayload.getInstallPromptEvent();
    if (installPromptEvent) {
      // Call prompt() to display the official prompt
      installPromptEvent.prompt().catch(function() {});
      // Wait for the user to respond to the prompt
      return installPromptEvent.userChoice.then(function(choiceResult) {
        if (choiceResult.outcome === 'accepted') {
          console.log('user accepted the A2HS prompt');
          return false;
        }
        console.log('user cancelled the A2HS prompt');
        // Don't ask the user again
        return true;
      });
    }
    return Promise.resolve(false);
  };


  return StartModule;
});