'use strict';

const logger = require('../../logger');
const { parse } = require('../../xml/poll');
const { pollForEvents } = require('../../processes/event');

const {
  serialize: serializeOadrResponse,
} = require('../../xml/poll/oadr-response');

const {
  serialize: serializeDistributeEvent,
} = require('../../xml/event/distribute-event');

exports.postController = async (req, res) => {
  const xmlRequest = req.body;
  let parsedRequest, jsonResponse, xmlResponse;
  let serialize = serializeOadrResponse;

  try {
    parsedRequest = await parse(xmlRequest);
    jsonResponse = await pollForEvents(
      parsedRequest,
      req.clientCertificateCn,
      req.clientCertificateFingerprint,
    );
    if (jsonResponse) {
      serialize = serializeDistributeEvent;
    } else {
      serialize = serializeOadrResponse;
      jsonResponse = {
        responseCode: '200',
        responseDescription: 'OK',
        responseRequestId: parsedRequest.requestId || '',
        venId: req.clientCertificateFingerprint,
      };
    }

    xmlResponse = serialize(jsonResponse);
  } catch (e) {
    logger.warn('Error occurred processing', parsedRequest, e);
    const responseRequestId =
      parsedRequest != null ? parsedRequest.requestId : '';
    xmlResponse = serialize({
      responseCode: e.responseCode || '454',
      responseDescription: e.message || 'Unknown error',
      responseRequestId: responseRequestId || '',
    });
  }
  res.set('Content-Type', 'application/xml');
  res.send(xmlResponse);
  res.end();
};

exports.postErrorHandler = (error, next) => {
  logger.warn('Error in OadrPoll', { error });
  next(error);
};