'use strict';

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

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 nantumRegistration = await nantum.fetchRegistration(requestVenId);

  if (nantumRegistration) {
    if (nantumRegistration.common_name !== clientCertificateCn) {
      const error = new Error('Client certificate CN mismatch');
      error.responseCode = 452;
      throw error;
    }
    if (nantumRegistration.registration_id == null) {
      const registrationId = v4().replace(/-/g, '');
      nantumRegistration.registration_id = registrationId;
      await nantum.updateRegistration(nantumRegistration);
    }
  } else {
    const registrationId = v4().replace(/-/g, '');
    nantumRegistration = {
      common_name: clientCertificateCn,
      ven_id: requestVenId,
      registration_id: registrationId,
    };
    await nantum.updateRegistration(nantumRegistration);
  }

  return nantumRegistrationToOadrRegistrationCreated(
    obj.requestId,
    nantumRegistration,
  );
}

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

  const requestVenId = clientCertificateFingerprint;

  let nantumRegistration = await nantum.fetchRegistration(requestVenId);

  if (nantumRegistration) {
    if (nantumRegistration.common_name !== clientCertificateCn) {
      const error = new Error('Client certificate CN mismatch');
      error.responseCode = 452;
      throw error;
    }
  } else {
    // response payload should not contain ven_id or registration_id
    nantumRegistration = {};
  }

  return nantumRegistrationToOadrRegistrationCreated(
    obj.requestId,
    nantumRegistration,
  );
}

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;
  }

  let nantumRegistration = await nantum.fetchRegistration(requestVenId);
  let cancelledRegistrationId;

  if (nantumRegistration) {
    if (nantumRegistration.common_name !== clientCertificateCn) {
      const error = new Error('Client certificate CN mismatch');
      error.responseCode = 452;
      throw error;
    }

    cancelledRegistrationId = nantumRegistration.registration_id;

    // clear all registration data
    nantumRegistration = {
      ven_id: requestVenId,
      common_name: clientCertificateCn,
    };
    await nantum.updateRegistration(nantumRegistration);
  }

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

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

function nantumRegistrationToOadrRegistrationCreated(
  requestId,
  nantumRegistration,
) {
  return {
    responseRequestId: requestId || '',
    responseCode: '200',
    responseDescription: 'OK',
    registrationId: nantumRegistration.registration_id,
    venId: nantumRegistration.ven_id,
    vtnId: vtnId,
    pollFreqDuration: 'PT10S',
  };
}

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