'use strict';

const { Ven } = require('../db');
const { v4 } = require('uuid');
const { vtnId } = require('../config');
const logger = require('../logger');

async function registerParty(
  obj,
  clientCertificateCn,
  clientCertificateFingerprint,
) {
  logger.info(
    'registerParty',
    obj,
    clientCertificateCn,
    clientCertificateFingerprint,
  );

  const requestVenId = obj.venId;

  if (!requestVenId) {
    const error = new Error('No VenID in request');
    error.responseCode = 452;
    throw error;
  }

  if (requestVenId !== clientCertificateFingerprint) {
    // as per certification item #512, venId MUST be case-sensitive
    const error = new Error('VenID does not match certificate');
    error.responseCode = 452;
    throw error;
  }

  if (!clientCertificateCn) {
    const error = new Error('Could not determine CN from client certificate');
    error.responseCode = 452;
    throw error;
  }

  let registrationId, venId;

  const existingDbRecordByVenId = await Ven.findOne({
    where: { ven_id: requestVenId },
  });
  const existingDbRecordByCommonName = await Ven.findOne({
    where: { common_name: clientCertificateCn },
  });

  if (existingDbRecordByVenId) {
    if (existingDbRecordByVenId.common_name !== clientCertificateCn) {
      const error = new Error('Client certificate CN mismatch');
      error.responseCode = 452;
      throw error;
    }
    registrationId = existingDbRecordByVenId.data.registrationId;
    venId = existingDbRecordByVenId.ven_id;
  } else if (existingDbRecordByCommonName) {
    const error = new Error('Ven already exists with that CN');
    error.responseCode = 452;
    throw error;
  } else {
    registrationId = v4().replace(/-/g, '');
    venId = requestVenId;
    const newVen = new Ven();
    newVen.common_name = clientCertificateCn;
    newVen.ven_id = requestVenId;
    newVen.data = {
      registrationId: registrationId,
    };
    await newVen.save();
  }

  return {
    responseRequestId: obj.requestId || '',
    responseCode: '200',
    responseDescription: 'OK',
    registrationId: registrationId,
    venId: venId,
    vtnId: vtnId,
    pollFreqDuration: 'PT10S',
  };
}

async function query(obj, clientCertificateCn, clientCertificateFingerprint) {
  logger.info('query', obj, clientCertificateCn, clientCertificateFingerprint);

  let registrationId, venId;

  const existingDbRecordByVenId = await Ven.findOne({
    where: { ven_id: clientCertificateFingerprint },
  });

  const existingDbRecordByCommonName = await Ven.findOne({
    where: { common_name: clientCertificateCn },
  });

  if (existingDbRecordByVenId) {
    if (existingDbRecordByVenId.common_name !== clientCertificateCn) {
      const error = new Error('Client certificate CN mismatch');
      error.responseCode = 452;
      throw error;
    }
    registrationId = existingDbRecordByVenId.data.registrationId;
    venId = existingDbRecordByVenId.ven_id;
  } else if (existingDbRecordByCommonName) {
    const error = new Error('Ven already exists with that CN');
    error.responseCode = 452;
    throw error;
  }

  return {
    responseRequestId: obj.requestId || '',
    responseCode: '200',
    responseDescription: 'OK',
    registrationId: registrationId,
    venId: venId,
    vtnId: vtnId,
    pollFreqDuration: 'PT10S',
  };
}

async function cancelParty(
  obj,
  clientCertificateCn,
  clientCertificateFingerprint,
) {
  logger.info(
    'cancelParty',
    obj,
    clientCertificateCn,
    clientCertificateFingerprint,
  );

  const registrationId = obj.registrationId;
  if (!registrationId) {
    const error = new Error('No registrationID in request');
    error.responseCode = 452;
    throw error;
  }

  const requestVenId = obj.venId;

  if (requestVenId && requestVenId !== clientCertificateFingerprint) {
    // as per certification item #512, venId MUST be case-sensitive
    const error = new Error('VenID does not match certificate');
    error.responseCode = 452;
    throw error;
  }

  const venId = clientCertificateFingerprint;

  if (!clientCertificateCn) {
    const error = new Error('Could not determine CN from client certificate');
    error.responseCode = 452;
    throw error;
  }

  const existingDbRecordByVenId = await Ven.findOne({
    where: { ven_id: venId },
  });

  if (existingDbRecordByVenId == null) {
    const error = new Error('No current registration for VenID');
    error.responseCode = 452;
    throw error;
  }

  if (existingDbRecordByVenId.data.registrationId !== registrationId) {
    const error = new Error('Incorrect registrationID for VenID');
    error.responseCode = 452;
    throw error;
  }

  await existingDbRecordByVenId.destroy();

  return {
    responseRequestId: obj.requestId || '',
    responseCode: '200',
    responseDescription: 'OK',
    registrationId: registrationId,
    venId: venId,
  };
}

module.exports = {
  cancelParty,
  query,
  registerParty,
};