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

// Checks users registration key against issued keys
async function isAuthed(uuid: string) {  // 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: string) {
  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: string, uuid: string) {
  try {
    const htmlTpl = await fs.readFile('mail-templates/register.html', 'utf-8');
    const htmlStr = htmlTpl.replace(/>>ACCESSCODE<</g, uuid);
    const htmlMin = await minify(htmlStr);
    const txtTpl = fs.readFile('mail-templates/register.txt', 'utf-8');
    return {
      to: eml,
      subject: 'OwlBoard Registration',
      text: (await txtTpl).replace(/>>ACCESSCODE<</g, uuid),
      html: htmlMin
    };
  } catch(err) {
    log.out('mailServices.generateConfirmationEmail: Error reading template, ' +
            err, 'err');
    return false;
  }
}

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