/**
 * 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
  }
}