/** This module provides middleware to respond with proper JSON error objects
 * using NODE_ENV setting to production or development. In dev mode it send the stacktrace.
 *
 * You call the returned function with an app instance
 *
 *  @author Johannes Konert
 * @licence  CC BY-SA 4.0
 *
 *
 * @module restapi/error-response
 * @type {Function}
 */
"use strict";
const logger = require('debug')('me2:error-response');

module.exports = (app) => {
  // development error handler
  // will print stacktrace as JSON response
  if (app.get('env') === 'development') {
    app.use(function (err, req, res, next) {
      logger('Internal Error: ', err.stack);
      res.status(err.status || 500);
      res.json({
        error: {
          message: err.message,
          error: err.stack
        }
      });
    });
  } else {
    // production error handler
    // no stacktraces leaked to user
    app.use(function (err, req, res, next) {
      res.status(err.status || 500);
      res.json({
        error: {
          message: err.message,
          error: {}
        }
      });
    });
  }
};