import type { Merge, SetRequired } from 'type-fest';
import type { ESLintConfig, KnownExtends, Settings } from '@aet/eslint-define-config';
import type { RuleOptions } from './index';

type OptionalObjectKey<T> = Exclude<
  {
    [Key in keyof T]: undefined | any[] extends T[Key]
      ? Key
      : undefined | Record<any, any> extends T[Key]
        ? Key
        : never;
  }[keyof T],
  undefined
>;

export type MiddlewareConfig = Merge<
  SetRequired<ESLintConfig, OptionalObjectKey<ESLintConfig>>,
  { extends: KnownExtends[] }
>;

export interface MiddlewareFunctions {
  addRules(rules: Partial<RuleOptions>): void;
  addSettings(settings: Partial<Settings>): void;
}

export type Middleware = (config: MiddlewareConfig, helpers: MiddlewareFunctions) => void;

export function defineMiddleware(middleware: Middleware): Middleware {
  return middleware;
}