import {Response, StatusCode} from "../types";

/**
 * Writes the response status and data to the response.
 * and closes the response.
 */
export async function completeResponse(res: Response, code: StatusCode, data: string | null): Promise<void> {
  res.status(code);
  res.appendHeader("Cache-Control", "no-cache");
  res.appendHeader("X-Content-Type-Options", "nosniff");

  if (data === undefined) {
    console.log("data is undefined");
  }
  if (data !== null) {
    res.appendHeader("Content-Length", data.length.toString());
    await res.write(data);
  }

  await res.close();
}

/**
 * Write JSON flushes the given data object as JSON to the response
 * and closes the response.
 */
export function writeJSON(res: Response, code: StatusCode, data: unknown): Promise<void> {
  const content = data === undefined ? "null" : JSON.stringify(data, null, 2);
  res.appendHeader("Content-Type", "application/json");
  return completeResponse(res, code, content);
}

export function writeError(res: Response, code: StatusCode, err: Error) {
  return writeJSON(res, code, {
    code,
    message: err.message,
    details: null,
  });
}