import { Injector } from '@angular/core';
import { Router,UrlSerializer } from '@angular/router';
import { AuthConfig, OAuthService, JwksValidationHandler, OAuthErrorEvent  } from 'angular-oauth2-oidc';
import { AppConfig } from "./app.config";

function getAuthConfig(appConfig: AppConfig): AuthConfig {
  let authConfig: AuthConfig = new AuthConfig();
  authConfig.issuer = appConfig.getConfig("issuer");
  authConfig.redirectUri = window.location.origin + "/cb";
  authConfig.silentRefreshRedirectUri = window.location.origin + "/silent-refresh.html";
  authConfig.clientId = appConfig.getConfig("clientId");
  authConfig.customQueryParams = { audience: appConfig.getConfig("audience") };
  authConfig.scope = "openid profile email";
  authConfig.oidc = true;
  authConfig.disableAtHashCheck = true;
  authConfig.requireHttps = appConfig.getConfig("requireHttps");
  return authConfig;
}

export function appConfigFactory(injector:Injector, appConfig: AppConfig, oauthService: OAuthService): () => Promise<any> {
  return (): Promise<any> => {
    return appConfig.load().then(() => {     
      oauthService.events.subscribe((event) => {
        console.log(event.type);
        if (event.type == 'token_error' || event.type == 'silent_refresh_timeout') {
          let e = event as OAuthErrorEvent;
          let p = e.params as any;
          if (event.type == 'silent_refresh_timeout' || (p.error && p.error == 'login_required')) {
            let router = injector.get(Router);
            console.log("Session expired");
            router.navigate(['loggedout'], { queryParams: { redirectTo: router.url } });
          }          
        }
      });
      oauthService.configure(getAuthConfig(appConfig));
      oauthService.tokenValidationHandler = new JwksValidationHandler();
      oauthService.tokenValidationHandler.validateAtHash = function () {
        return new Promise<boolean>((res) => { res(true); })
      };
      oauthService.setupAutomaticSilentRefresh();
      let router = injector.get(Router);
      var urlTree = router.parseUrl(window.location.href);
      var urlPath = window.location.pathname;
      oauthService.loadDiscoveryDocument().then(() => {
        oauthService.tryLogin({
          onTokenReceived: (info) => {
            urlPath = info.state;
          }
        }).then(() => {
          let router = injector.get(Router);
          if (!oauthService.hasValidAccessToken()) {
            oauthService.initImplicitFlow(urlPath);
          } else {
            router.navigateByUrl(urlPath);
          }
        });       
      })
    });
  }
}