/// <reference types="node" />

import { FastifyInstance, FastifyPlugin, FastifyRequest } from 'fastify'

type OriginCallback = (err: Error | null, allow: boolean) => void;
export type OriginFunction = (origin: string, callback: OriginCallback) => void;
type OriginType = string | boolean | RegExp;
type ValueOrArray<T> = T | ArrayOfValueOrArray<T>;

interface ArrayOfValueOrArray<T> extends Array<ValueOrArray<T>> {
}

export interface FastifyCorsOptions {
  /**
   * Configures the Access-Control-Allow-Origin CORS header.
   */
  origin?: ValueOrArray<OriginType> | OriginFunction;
  /**
   * Configures the Access-Control-Allow-Credentials CORS header.
   * Set to true to pass the header, otherwise it is omitted.
   */
  credentials?: boolean;
  /**
   * Configures the Access-Control-Expose-Headers CORS header.
   * Expects a comma-delimited string (ex: 'Content-Range,X-Content-Range')
   * or an array (ex: ['Content-Range', 'X-Content-Range']).
   * If not specified, no custom headers are exposed.
   */
  exposedHeaders?: string | string[];
  /**
   * Configures the Access-Control-Allow-Headers CORS header.
   * Expects a comma-delimited string (ex: 'Content-Type,Authorization')
   * or an array (ex: ['Content-Type', 'Authorization']). If not
   * specified, defaults to reflecting the headers specified in the
   * request's Access-Control-Request-Headers header.
   */
  allowedHeaders?: string | string[];
  /**
   * Configures the Access-Control-Allow-Methods CORS header.
   * Expects a comma-delimited string (ex: 'GET,PUT,POST') or an array (ex: ['GET', 'PUT', 'POST']).
   */
  methods?: string | string[];
  /**
   * Configures the Access-Control-Max-Age CORS header.
   * Set to an integer to pass the header, otherwise it is omitted.
   */
  maxAge?: number;
  /**
   * Pass the CORS preflight response to the route handler (default: false).
   */
  preflightContinue?: boolean;
  /**
   * Provides a status code to use for successful OPTIONS requests,
   * since some legacy browsers (IE11, various SmartTVs) choke on 204.
   */
  optionsSuccessStatus?: number;
  /**
   * Pass the CORS preflight response to the route handler (default: false).
   */
  preflight?: boolean;
  /**
   * Enforces strict requirement of the CORS preflight request headers (Access-Control-Request-Method and Origin).
   * Preflight requests without the required headers will result in 400 errors when set to `true` (default: `true`).
   */
  strictPreflight?: boolean;
  /**
   * Hide options route from the documentation built using fastify-swagger (default: true).
   */
  hideOptionsRoute?: boolean;
}

export interface FastifyCorsOptionsDelegateCallback { (req: FastifyRequest, cb: (error: Error | null, corsOptions?: FastifyCorsOptions) => void): void }
export interface FastifyCorsOptionsDelegatePromise { (req: FastifyRequest):  Promise<FastifyCorsOptions>}
export type FastifyCorsOptionsDelegate = FastifyCorsOptionsDelegateCallback | FastifyCorsOptionsDelegatePromise
export type FastifyPluginOptionsDelegate<T> = (instance: FastifyInstance) => T;

declare const fastifyCors: FastifyPlugin<FastifyCorsOptions | FastifyPluginOptionsDelegate<FastifyCorsOptionsDelegate>>;
export default fastifyCors;