'use strict';

const { parseXML, childAttr, required } = require('../parser');
const { create, fragment } = require('xmlbuilder2');

const oadrPayloadNs = 'http://www.w3.org/2000/09/xmldsig#';
const oadrNs = 'http://openadr.org/oadr-2.0b/2012/07';
const energyInteropNs = 'http://docs.oasis-open.org/ns/energyinterop/201110';
const energyInteropPayloadsNs =
  'http://docs.oasis-open.org/ns/energyinterop/201110/payloads';
const calendarNs = 'urn:ietf:params:xml:ns:icalendar-2.0';

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

  const result = {
    _type: 'oadrCancelPartyRegistration',
    requestId: required(childAttr(o, 'requestID'), 'requestID'),
    registrationId: required(childAttr(o, 'registrationID'), 'registrationID'),
  };

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

  return result;
}

function serialize(obj) {
  const venId =
    obj.venId != null
      ? fragment()
        .ele(energyInteropNs, 'ei:venID')
        .txt(obj.venId)
      : fragment();

  const doc = create({
    namespaceAlias: {
      ns: oadrPayloadNs,
      oadr2b: oadrNs,
      ei: energyInteropNs,
      pyld: energyInteropPayloadsNs,
      cal: calendarNs,
    },
  })
    .ele('@oadr2b', 'oadr2b:oadrPayload')
    .ele('oadr2b:oadrSignedObject')
    .ele('oadr2b:oadrCancelPartyRegistration')
    .att(energyInteropNs, 'ei:schemaVersion', '2.0b')
    .ele('@pyld', 'pyld:requestID')
    .txt(obj.requestId)
    .up()
    .ele('@ei', 'ei:registrationID')
    .txt(obj.registrationId)
    .up()
    .import(venId)
    .doc();
  return doc.end({ headless: true, prettyPrint: false });
}

module.exports = {
  parse,
  serialize,
};