const SessionManager = require('../Authentication/SessionManager')
const ContactManager = require('./ContactManager')
const UserGetter = require('../User/UserGetter')
const Modules = require('../../infrastructure/Modules')
const { expressify } = require('../../util/promises')

function _formatContact(contact) {
  return {
    id: contact._id?.toString(),
    email: contact.email || '',
    first_name: contact.first_name || '',
    last_name: contact.last_name || '',
    type: 'user',
  }
}

async function getContacts(req, res) {
  const userId = SessionManager.getLoggedInUserId(req.session)

  const contactIds = await ContactManager.promises.getContactIds(userId, {
    limit: 50,
  })

  let contacts = await UserGetter.promises.getUsers(contactIds, {
    email: 1,
    first_name: 1,
    last_name: 1,
    holdingAccount: 1,
  })

  // UserGetter.getUsers may not preserve order so put them back in order
  const positions = {}
  for (let i = 0; i < contactIds.length; i++) {
    const contactId = contactIds[i]
    positions[contactId] = i
  }
  contacts.sort(
    (a, b) => positions[a._id?.toString()] - positions[b._id?.toString()]
  )

  // Don't count holding accounts to discourage users from repeating mistakes (mistyped or wrong emails, etc)
  contacts = contacts.filter(c => !c.holdingAccount)

  contacts = contacts.map(_formatContact)

  const additionalContacts = await Modules.promises.hooks.fire(
    'getContacts',
    userId,
    contacts
  )

  contacts = contacts.concat(...(additionalContacts || []))
  return res.json({
    contacts,
  })
}

module.exports = {
  getContacts: expressify(getContacts),
}