/**
 * @format
 */
import {Platform, NativeModules} from 'react-native';

const AuthenticationToken = NativeModules.FBAuthenticationToken;

export type AuthenticationTokenMap = {
  authenticationToken: string;
  nonce: string;
  graphDomain: string;
};

/**
 * Represents an immutable access token for using Facebook services.
 */
class FBAuthenticationToken {
  /**
     The raw token string from the authentication response
    */
  authenticationToken: string;

  /**
     The nonce from the decoded authentication response
    */
  nonce: string;

  /**
    The graph domain where the user is authenticated.
   */
  graphDomain: string;

  constructor(tokenMap: AuthenticationTokenMap) {
    this.authenticationToken = tokenMap.authenticationToken;
    this.nonce = tokenMap.nonce;
    this.graphDomain = tokenMap.graphDomain;
    Object.freeze(this);
  }

  /**
   * Getter for the authentication token
   */
  static getAuthenticationTokenIOS() {
    if (Platform.OS === 'android') {
      return Promise.resolve(null);
    }
    return new Promise<FBAuthenticationToken | null>((resolve) => {
      AuthenticationToken.getAuthenticationToken(
        (tokenMap: AuthenticationTokenMap) => {
          if (tokenMap) {
            resolve(new FBAuthenticationToken(tokenMap));
          } else {
            resolve(null);
          }
        },
      );
    });
  }
}

export default FBAuthenticationToken;