'use strict';

const { parseXML, childAttr, required } = require('../parser');
const { fragment } = require('xmlbuilder2');
const {
  createDoc,
  energyInteropNs,
  serializeEiResponse,
  serializeDuration,
  parseEiResponse,
} = require('../shared');

async function parse(input) {
  const json = await parseXML(input);
  const o =
    json['oadrPayload']['$$']['oadrSignedObject'][0]['$$'][
      'oadrCreatedPartyRegistration'
    ][0]['$$'];

  const { code, description, requestId } = parseEiResponse(
    o['eiResponse'][0]['$$'],
  );

  const result = {
    _type: 'oadrCreatedPartyRegistration',
    responseCode: code,
    responseRequestId: requestId,
  };

  if (description != null) {
    result.responseDescription = description;
  }

  if (code < 200 || code >= 300) {
    return result;
  }

  const registrationId = childAttr(o, 'registrationID');
  if (registrationId != null) result.registrationId = registrationId;

  const venId = childAttr(o, 'venID');
  if (venId != null) result.venId = venId;

  const vtnId = required(childAttr(o, 'vtnID'), 'vtnID');
  if (vtnId != null) result.vtnId = vtnId;

  const oadrRequestedOadrPollFreq = childAttr(o, 'oadrRequestedOadrPollFreq');
  if (oadrRequestedOadrPollFreq != null) {
    const oadrRequestedOadrPollFreqDuration = required(
      childAttr(oadrRequestedOadrPollFreq['$$'], 'duration'),
      'duration',
    );
    if (oadrRequestedOadrPollFreqDuration != null)
      result.pollFreqDuration = oadrRequestedOadrPollFreqDuration;
  }

  return result;
}

function validate(obj) {
  if (!obj.responseCode) {
    throw new Error('Missing responseCode');
  }
  if (!obj.responseRequestId) {
    throw new Error('Missing responseRequestId');
  }
}

function serialize(obj) {
  validate(obj);

  const registrationId =
    obj.registrationId != null
      ? fragment()
        .ele(energyInteropNs, 'ei:registrationID')
        .txt(obj.registrationId)
      : fragment();
  const venId =
    obj.venId != null
      ? fragment()
        .ele(energyInteropNs, 'ei:venID')
        .txt(obj.venId)
      : fragment();
  const vtnId =
    obj.vtnId != null
      ? fragment()
        .ele(energyInteropNs, 'ei:vtnID')
        .txt(obj.vtnId)
      : fragment();

  const doc = createDoc()
    .ele('@oadr2b', 'oadr2b:oadrPayload')
    .ele('oadr2b:oadrSignedObject')
    .ele('oadr2b:oadrCreatedPartyRegistration')
    .att('@ei', 'ei:schemaVersion', '2.0b')
    .import(serializeEiResponse(obj))
    .import(registrationId)
    .import(venId)
    .import(vtnId)
    .ele('oadr2b:oadrProfiles')
    .ele('oadr2b:oadrProfile')
    .ele('oadr2b:oadrProfileName')
    .txt('2.0b')
    .up()
    .ele('oadr2b:oadrTransports')
    .ele('oadr2b:oadrTransport')
    .ele('oadr2b:oadrTransportName')
    .txt('simpleHttp')
    .up()
    .up()
    .up()
    .up()
    .up()
    .ele('oadr2b:oadrRequestedOadrPollFreq')
    .import(serializeDuration(obj.pollFreqDuration))
    .doc();
  return doc.end({ headless: true, prettyPrint: false });
}

async function canParse(input) {
  const json = await parseXML(input);
  const o = json['oadrPayload']['$$']['oadrSignedObject'][0]['$$'];
  return o['oadrCreatedPartyRegistration'] != null;
}

function canSerialize(message) {
  return message._type === 'oadrCreatedPartyRegistration';
}

module.exports = {
  parse,
  serialize,
  canParse,
  canSerialize,
};