const bcrypt = require('bcryptjs');

class Authenticator {

  constructor(database) {
    this.database = database;
  };

  getAuthenticatedUser(req, callback) {
    if (req.session.userId) {
      let collection = this.database.collection('users');
      collection.findOne({ id: req.session.userId }, {}, function (dbErr, dbRes) {
        if (dbErr === null) {
          if (dbRes === null) {
            callback(null);
          } else {
            callback(dbRes);
          }
        } else {
          callback(null);
        }
      });
    } else {
      callback(null);
    }
  };

  withUser(req, res, callback) {
    this.getAuthenticatedUser(req, (user) => {
      if (user) callback(user);
      else res.status(401).send({ code: 'auth error', message: 'user not logged in.' });
    });
  };

  withAdmin(req, res, callback) {
    this.withUser(req, res, (user) => {
      if (user.role === 'Admin') callback(user)
      else res.status(403).send({ code: 'auth error', message: 'user is not Admin.' });
    });
  };

};

module.exports = Authenticator;