// Requires:
// enironment.prod.js
// oidc-client.min.js
// locale.js

Oidc.Log.logger = console;

let userManager;

init();


function init() {
  try {
    // The exports.authenticationSettings global variable will be imported from environment.prod.js
    const authSettings = parseAuthSettings(exports.authenticationSettings);
        
    console.debug(authSettings);
    
    userManager = new Oidc.UserManager(authSettings);
    userManager.getUser()
      .then(function(user) {
        if (user) {
          redirectLoggedInUser(user);
        }
        else {
          startAuthentication();
        }
      })
      .catch(function(e){
        showMessage(e.message);
      });
  }
  catch(e) {
    console.error(e);
    showMessage('Unable to initialise authentication provider');
    return;
  }
}

function redirectLoggedInUser(user) {
  let locale;
  
	// Redirect to the root of the localised Angular app
	let pathParts = document.location.pathname.split('/');
	if (pathParts.length > 1) locale = pathParts[1];
  
  let routeToUrl = document.location.href;
  
  if (!isValidLocale(locale)) {
    // Locale is invalid. Find the best match.
    const invalidLocale = locale;
    locale = getLocaleForUser(user);
    
    // Replace the locale in the routeToUrl
    routeToUrl = document.location.href.replace(invalidLocale, locale);
  }

  // Store the requested URL so Angular can route to it
  window.sessionStorage.setItem('dimensions.postAuthenticationRedirectUrl', routeToUrl);

  // Redirect to the approprirate Angular app
	let angularBaseUrl = `${document.location.origin}/${locale}`;
	console.debug('Redirect logged-in user to', angularBaseUrl);
	document.location.replace(angularBaseUrl);
}


function parseAuthSettings(settings) {
  let parsedSettings = { };

  for(var key in settings) {
    let value = settings[key];
    if (typeof value === 'string') {
      value = value.replace('::origin::', window.location.origin);
    }
    parsedSettings[key] = value;
  }

  return parsedSettings;
}



function showMessage(message) {
  document.getElementById('message').innerText = message;
}




function startAuthentication(args) {
  console.debug('startAuthentication');

  let url = document.location.href;
  console.debug('Set post-auth URL', url);
  window.sessionStorage.setItem('dimensions.postAuthenticationRedirectUrl', url);
  
  userManager.signinRedirect(args)
    .catch(e => {
      console.error('Error starting authentication', e);
      showMessage("Unable to connect to authentication server.");
    });
}