'use strict';

const { parseXML, childAttr, required } = require('../parser');
const { createDoc, serializeReports, parseReports } = require('../shared');

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

  const requestId = required(childAttr(o, 'requestID'), 'requestID');

  const result = {
    _type: 'oadrUpdateReport',
    requestId: requestId,
  };

  result.reports = parseReports(o['oadrReport'] || []);
  return result;
}

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

function serialize(obj) {
  validate(obj);

  const doc = createDoc()
    .ele('@oadr2b', 'oadr2b:oadrPayload')
    .ele('oadr2b:oadrSignedObject')
    .ele('oadr2b:oadrUpdateReport')
    .att('@ei', 'ei:schemaVersion', '2.0b')
    .ele('@pyld', 'pyld:requestID')
    .txt(obj.requestId)
    .up()
    .import(serializeReports(obj.reports))
    .up()
    .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['oadrUpdateReport'] != null;
}

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

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