'use strict';

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

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

  const requestVenId = oadrCreatePartyRegistration.venId;
  validateVenId(requestVenId, clientCertificateFingerprint, true);
  validateCreatePartyRegistration(oadrCreatePartyRegistration);

  let ven = await nantum.getVenRegistration(requestVenId);

  if (ven) {
    if (ven.client_certificate_common_name !== clientCertificateCn) {
      const error = new Error('Client certificate CN mismatch');
      error.responseCode = 452;
      throw error;
    }
  } else {
    const registrationId = v4().replace(/-/g, '');

    ven = {
      client_certificate_common_name: clientCertificateCn,
      client_certificate_fingerprint: clientCertificateFingerprint,
      registration_id: registrationId,
      is_report_only: oadrCreatePartyRegistration.oadrReportOnly,
      profile_name: oadrCreatePartyRegistration.oadrProfileName,
      supports_xml_sig: oadrCreatePartyRegistration.oadrXmlSignature,
      transport_name: oadrCreatePartyRegistration.oadrTransportName,
      uses_http_pull: oadrCreatePartyRegistration.oadrHttpPullModel,
      dis: oadrCreatePartyRegistration.oadrVenName,
    };
    await nantum.createVenRegistration(ven);
  }

  return venToOadrRegistrationCreated(
    oadrCreatePartyRegistration.requestId,
    ven,
  );
}

function validateCreatePartyRegistration(oadrCreatePartyRegistration) {
  if (oadrCreatePartyRegistration.oadrTransportName !== 'simpleHttp') {
    const error = new Error('Transport name must be simpleHttp');
    error.responseCode = 459;
    throw error;
  }

  if (oadrCreatePartyRegistration.oadrProfileName !== '2.0b') {
    const error = new Error('Profile name must be 2.0b');
    error.responseCode = 459;
    throw error;
  }

  if (oadrCreatePartyRegistration.oadrReportOnly) {
    const error = new Error('Report-only mode is not supported');
    error.responseCode = 459;
    throw error;
  }

  if (oadrCreatePartyRegistration.oadrXmlSignature) {
    const error = new Error('XML signature mode is not supported');
    error.responseCode = 459;
    throw error;
  }

  if (
    oadrCreatePartyRegistration.oadrHttpPullModel != null &&
    !oadrCreatePartyRegistration.oadrHttpPullModel
  ) {
    const error = new Error('simpleHttp push mode is not supported');
    error.responseCode = 459;
    throw error;
  }

  if (oadrCreatePartyRegistration.oadrTransportAddress) {
    const error = new Error('oadrTransportAddress is not supported');
    error.responseCode = 459;
    throw error;
  }
}

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

  const requestVenId = clientCertificateFingerprint;

  let ven = await nantum.getVenRegistration(requestVenId);

  if (ven) {
    if (ven.client_certificate_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
    ven = {};
  }

  return venToOadrRegistrationCreated(oadrQueryRegistration.requestId, ven);
}

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

  const requestVenId = oadrCancelPartyRegistration.venId;
  validateVenId(requestVenId, clientCertificateFingerprint, false);
  const venId = clientCertificateFingerprint;

  let ven = await nantum.getVenRegistration(requestVenId);

  let cancelledRegistrationId;

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

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

    // clear all registration data
    await nantum.deleteVenRegistration(ven._id);
  }

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

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

function validateVenId(requestVenId, clientCertificateFingerprint, required) {
  if (requestVenId === clientCertificateFingerprint) {
    return;
  }
  if (!required && requestVenId == null) {
    return;
  }
  if (required && requestVenId == null) {
    const error = new Error('VenID is missing');
    error.responseCode = 452;
    throw error;
  }
  const error = new Error('VenID does not match certificate');
  error.responseCode = 452;
  throw error;
}

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