import type { AppTools, Bundler } from '@modern-js/app-tools';

type AppToolsUserConfig<T extends Bundler> = AppTools<T>['userConfig']['tools'];

type ExcludeUndefined<T> = T extends undefined ? never : T;

type ExtractObjectType<T> = T extends (...args: any[]) => any ? never : T;

type OmitArrayConfiguration<T> =
  T extends Array<any> ? (T extends (infer U)[] ? U : T) : ExtractObjectType<T>;

type WebpackConfigs =
  ExcludeUndefined<AppToolsUserConfig<'webpack'>> extends { webpack?: infer U }
    ? U
    : never;
type ObjectWebpack = ExtractObjectType<OmitArrayConfiguration<WebpackConfigs>>;

type RspackConfigs =
  ExcludeUndefined<AppToolsUserConfig<'rspack'>> extends { rspack?: infer U }
    ? U
    : never;
type ObjectRspack = ExtractObjectType<OmitArrayConfiguration<RspackConfigs>>;

export type BundlerConfig<T extends Bundler> = T extends 'rspack'
  ? ObjectRspack
  : ObjectWebpack;