import LRU from 'ylru';
import { HttpClient, HEADER_USER_AGENT } from './HttpClient.js';
import { RequestOptions, RequestURL } from './Request.js';

let httpClient: HttpClient;
const domainSocketHttpClients = new LRU(50);

export function getDefaultHttpClient(): HttpClient {
  if (!httpClient) {
    httpClient = new HttpClient();
  }
  return httpClient;
}

export async function request<T = any>(url: RequestURL, options?: RequestOptions) {
  if (options?.socketPath) {
    let domainSocketHttpclient = domainSocketHttpClients.get<HttpClient>(options.socketPath);
    if (!domainSocketHttpclient) {
      domainSocketHttpclient = new HttpClient({
        connect: { socketPath: options.socketPath },
      });
      domainSocketHttpClients.set(options.socketPath, domainSocketHttpclient);
    }
    return await domainSocketHttpclient.request<T>(url, options);
  }

  return await getDefaultHttpClient().request<T>(url, options);
}

// export curl method is keep compatible with urllib.curl()
// ```ts
// import * as urllib from 'urllib';
// urllib.curl(url);
// ```
export async function curl<T = any>(url: RequestURL, options?: RequestOptions) {
  return await request<T>(url, options);
}

export {
  MockAgent, ProxyAgent, Agent, Dispatcher,
  setGlobalDispatcher, getGlobalDispatcher,
} from 'undici';
// HttpClient2 is keep compatible with urllib@2 HttpClient2
export {
  HttpClient, HttpClient as HttpClient2, HEADER_USER_AGENT as USER_AGENT,
  RequestDiagnosticsMessage, ResponseDiagnosticsMessage,
} from './HttpClient.js';
// RequestOptions2 is keep compatible with urllib@2 RequestOptions2
export {
  RequestOptions, RequestOptions as RequestOptions2, RequestURL, HttpMethod,
  FixJSONCtlCharsHandler, FixJSONCtlChars,
} from './Request.js';

export {
  SocketInfo, Timing, RawResponseWithMeta, HttpClientResponse,
} from './Response.js';
export {
  IncomingHttpHeaders,
} from './IncomingHttpHeaders.js';
export * from './HttpClientError.js';

export default {
  request,
  curl,
  USER_AGENT: HEADER_USER_AGENT,
};