const log    = require('../utils/log.utils')
const crypto = require('crypto')
const db     = require('../services/dbAccess.services')
const fs     = require('fs/promises')
const minify = require('html-minifier').minify

// Checks users registration key against issued keys
async function isAuthed(uuid) {  // Needs testing
  const q = {uuid: uuid}
  const res = await db.query('users', q)
  log.out(`authUtils.checkUser: DB Query answer: ${JSON.stringify(res[0])}`, 'dbug')
  const authorized = res && res[0] && res[0].domain
  if (authorized) db.userAtime(uuid)
  return authorized
}

// Checks whether a registration request key is valid
async function checkRequest(key) {
  const collection = 'registrations'
  const query = {uuid: key}
  const res = await db.query(collection, query)
  log.out(`authUtils.checkRequest: DB Query result: ${JSON.stringify(res)}`, 'dbug')
  const result = res.length > 0 && res[0].time
    ? { result: true, domain: res[0].domain }
    : { result: false }
  return result
}

// Creates an API key for a user
async function generateKey() {  // Needs testing & moving to 'register.utils'
  return crypto.randomUUID()
}

async function generateConfirmationEmail(eml, uuid) {
  try {
    let htmlTpl = await fs.readFile('mail-templates/register.html', 'utf-8')
    let mini = minify(((htmlTpl).replace(/>>ACCESSCODE<</g, uuid)), { // Add collapse whitespace here
      removeComments: true,
      collapseWhitespace: true,
      minifyCSS: true
    })
    let txtTpl = fs.readFile('mail-templates/register.txt', 'utf-8')
    return { // CSS Needs to be inlined.  See css-inline, or css-inliner
      to: eml,
      subject: 'OwlBoard Registration',
      text: (await txtTpl).replace(/>>ACCESSCODE<</g, uuid),
      html: mini
    }
  } catch(err) {
    log.out('mailServices.generateConfirmationEmail: Error reading templates, $(err)', 'err')
    return false
  }
}

module.exports = {
  isAuthed,
  generateKey,
  generateConfirmationEmail,
  checkRequest
}