const log     = require('../utils/logs.utils');
const auth    = require('../utils/auth.utils');
const db      = require('./dbAccess.services');
const mail    = require('./mail.services');
const clean   = require('../utils/sanitizer.utils');
const domains = require('../configs/domains.configs');
const errors  = require('../configs/errorCodes.configs');

async function createRegKey(body) {
  log.out('registerServices.createRegKey: Incoming request', 'INFO');
  if (body.email) {
    const domain = await clean.getDomainFromEmail(body.email);
    log.out(`registerServices: Registration request from: ${domain}`, 'info');
    if (domains.includes(domain)) {
      log.out(`registerServices.createRegKey: Key from valid: ${domain}`,'info');
      const uuid = await auth.generateKey();
      db.addRegReq(uuid, domain);
      const message = await auth.generateConfirmationEmail(body.email, uuid);
      if (!message) {
        const err = new Error('Message generation error');
        log.out('registerServices.createRegKey: Error generating email', 'err');
        log.out(err, 'err');
        return 500;
      }
      if (await mail.send(message) == true) {
        return {status: 201, message: 'email sent'};
      }
      return {status: 500, errorCode: 950, errorMsg: errors[950]};
    }
    return {status: 403, errorCode: 702, errorMsg: errors[702]};
  } else {
    return {status: 400, errorCode: 901, errorMsg: errors[902]};
  }
}

async function regUser(req) { // Add input validation
  log.out(`Read UUID: ${req.uuid}`, 'dbug');
  log.out(`registrationServices.regUser: Request from: ${req.uuid}`, 'info');
  const res = await auth.checkRequest(req.uuid);
  log.out(`registrationServices.regUser: ${JSON.stringify(res)}`, 'info');
  if (res.result) {
    const uuid = await auth.generateKey();
    const apiKey = await db.addUser(uuid, res.domain);
    if (apiKey) {
      db.delRegReq(req.uuid);
      return {status: 201, message: 'User added', api_key: uuid};
    }
  }
  return {status: 401, errorCode: 703, errorMsg: errors[703]};
}

async function getUser(uuid) {
  log.out('registrationServices: Finding user for given UUID', 'dbug');
  try {
    const filter = {
      uuid: uuid
    };
    const res = await db.query('users', filter, false);
    if (res.length) {
      return res;
    } else {
      return {status: 404, errorCode:400, errorMsg: errors[400]};
    }
  } catch (err) {
    console.log(err);
    return {status: 500, errorCode: 951, errorMsg: errors[951]};
  }
}

module.exports = {
  regUser,
  createRegKey,
  getUser
};