import * as express from "express";

import ApiError from "@common/ApiError";
import { ErrorCode } from "@common/ErrorCode";

const isDev = process.env.NODE_ENV === "development";

const errorHandler: express.ErrorRequestHandler = (
  err: any,
  req: express.Request,
  res: express.Response,
  next: express.NextFunction
) => {
  if (err instanceof ApiError) {
    // TODO: different content-type?
    res.status(err.statusCode).json(err.toJSON(isDev));
  } else if (err) {
    let error: ApiError;
    if (err.code === "ENOENT") {
      error = new ApiError(
        "The specified resource could not be found",
        ErrorCode.NotFound,
        err
      );
    } else {
      error = new ApiError(
        "An internal server error has occurred",
        ErrorCode.Internal,
        err.stack ? err.stack : err
      );
    }
    errorHandler(error, req, res, next);
  }
  next();
};

export default errorHandler;