import express = require('express');

export type Ip              = string;
export type CidrRange       = string;
export type Route           = string;
export type StartEndIpRange = Ip[];
export type IpRange         = CidrRange | StartEndIpRange;
export type IpList          = Array<Ip | IpRange>;

export interface IpCallback {
  (): IpList;
}

export interface IpFilterOptions {
  detectIp?: (request: express.Request) => Ip;
  excluding?: Route[];
  log?: boolean;
  logLevel?: 'all' | 'deny' | 'allow';
  logF?: (message: string) => void;
  mode?: 'deny' | 'allow';
  // `@types/proxy-addr` does not export the `trust` parameter type
  trustProxy?: any;
}

export function IpFilter(
  ips: IpList | IpCallback,
  opts?: IpFilterOptions,
): express.RequestHandler;

export class IpDeniedError extends Error {
  status: number;
  extra: { ip: Ip };
  constructor(
    message: string,
    extra: any,
  );
}