import NetlifyAuthClient from "netlify-auth-js";
import { pick } from "lodash";
import GitHubBackend from "../github/implementation";
import API from "./API";
import AuthenticationPage from "./AuthenticationPage";

export default class NetlifyAuth extends GitHubBackend {
  constructor(config) {
    super(config, true);
    if (config.getIn(["backend", "auth_url"]) == null) { throw new Error("The NetlifyAuth backend needs an \"auth_url\" in the backend configuration."); }

    if (config.getIn(["backend", "github_proxy_url"]) == null) {
      throw new Error("The NetlifyAuth backend needs an \"github_proxy_url\" in the backend configuration.");
    }

    this.github_proxy_url = config.getIn(["backend", "github_proxy_url"]);

    this.authClient = new NetlifyAuthClient({
      APIUrl: config.getIn(["backend", "auth_url"]),
    });

    AuthenticationPage.authClient = this.authClient;
  }

  setUser() {
    const user = this.authClient.currentUser();
    if (!user) return Promise.reject();
    return this.authenticate(user);
  }

  authenticate(user) {
    this.tokenPromise = user.jwt.bind(user);
    const userData = {
      name: `${ user.user_metadata.firstname } ${ user.user_metadata.lastname }`,
      email: user.email,
      metadata: user.user_metadata,
    };
    this.api = new API({
      api_root: this.github_proxy_url,
      tokenPromise: this.tokenPromise,
      commitAuthor: pick(userData, ["name", "email"]),
    });
    return Promise.resolve(userData);
  }

  getToken() {
    return this.tokenPromise();
  }

  authComponent() {
    return AuthenticationPage;
  }

}