import * as http from 'http';
import saveResponse from './funcs/saveResponse';

/** Downloads the given URL and saves it to disk. Returns the location where file is saved under. Throws error if download fails. */
export default function downloadUrlContents(
  host: string,
  path: string,
  tempFileName: string,
  resolve: (fileName: string) => void,
  reject: (reason: Error | string) => void,
): void {
  //Create HTTP request
  const request = http.request({
    family: 4,
    hostname: host,
    path,
  }, saveResponse.bind(null, tempFileName, resolve, (reason: string) => { request.abort(); reject(reason); }));

  //In case of connection errors, exit early
  request.on('error', (error) => {
    request.abort();
    reject(error);
  });

  request.end();
}