/**
 * This module allows to authenticate socket.io connections with JWTs.
 * This is especially if you do not want to use cookies in a single page application.
 */

/// <reference types="socket.io" />

declare module 'socketio-jwt' {

  /**
   * Defines possible errors for the secret-callback.
   */
  interface ISocketIOError {
    readonly code: string;
    readonly message: string;
  }

  /**
   * Callback gets called, if secret is given dynamically.
   */
  interface ISocketCallback {
    (err: ISocketIOError, success: string): void;
  }

  interface ISocketIOMiddleware {
    (socket: SocketIO.Socket, fn: (err?: any) => void): void;
  }

  interface IOptions {
    additional_auth?: (decoded: object, onSuccess: () => void, onError: (err: (string | ISocketIOError), code: string) => void) => void;
    customDecoded?: (decoded: object) => object;

    callback?: (false | number);
    secret: (string | ((request: any, decodedToken: object, callback: ISocketCallback) => void));

    encodedPropertyName?: string;
    decodedPropertyName?: string;
    auth_header_required?: boolean;
    handshake?: boolean;
    required?: boolean;
    timeout?: number;
    cookie?: string;
  }

  function authorize(options: IOptions/*, onConnection: Function*/): ISocketIOMiddleware;

  interface UnauthorizedError extends Error {
    readonly message: string;
    readonly inner: object;
    readonly data: { message: string, code: string, type: 'UnauthorizedError' }
  }

  var UnauthorizedError: {
    prototype: UnauthorizedError;
    new (code: string, error: { message: string }): UnauthorizedError;
  }

  /**
   * This is an augmented version of the SocketIO.Server.
   * It knows the 'authenticated' event and should be extended in future.
   * @see SocketIO.Server 
   */
  export interface JWTServer extends SocketIO.Server {

    /**
     * The event gets fired when a new connection is authenticated via JWT.
     * @param event The event being fired: 'authenticated'
     * @param listener A listener that should take one parameter of type Socket
     * @return The default '/' Namespace
     */
    on(event: ('authenticated' | string), listener: (socket: SocketIO.Socket) => void): SocketIO.Namespace;
  }
}