'use strict';

/** 
 * Error handling functions for the REST server applications.
 * Notes: This module provides reusable functions to create and handle API errors.
 * It includes functions to create application-specific error objects, throw errors, and handle response errors.
 * 
 * However, the error handling logic is just the simplest form of error management.
 * @author: Trung Hoang
 * @version: 1.0.1
 * @date: 2023-10-01
 * @license: proprietary
 * @description: This module provides functions to create and handle API errors. 
 */

const { isAppError } = require('./utils/common');

function appError(tag) {
  if (!tag)
    return { error: { '.tag': 'unknown_error', text: 'Unknown Error' } }
  else
    return { error: { '.tag': tag } }
  // return { error: { '.tag': tag, text: msg ? msg : '' } }
}

function throwError(tag) {
  throw new Error(tag);
}

function handleResErr(res, err, code = 409) {
  if (!res || typeof res !== "object") return;

  const _erCode = code;
  const _err = isAppError(err);
  if (_err) {
    res.status(_erCode || 409).send(appError(_err));
  } else {
    res.status(_erCode || 500).send(appError('unknown_error'));
    if (err) console.log(err.stack);
  }
}


module.exports = {
  throwError, appError, handleResErr
}