import crypto from 'crypto';
import { v5 } from 'uuid';
import jwt from 'jsonwebtoken';
import bcrypt from 'bcrypt';

const UUID_REGEX = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-5][0-9a-f]{3}-[089ab][0-9a-f]{3}-[0-9a-f]{12}$/;

export function sha256(...args) {
  return crypto.createHash('sha256').update(args.join('')).digest('hex');
}

export function secret() {
  return sha256(process.env.HASH_SALT);
}

export function uuid(...args) {
  return v5(args.join(''), v5(process.env.HASH_SALT, v5.DNS));
}

export function random(n = 64) {
  return crypto.randomBytes(n).toString('hex');
}

export function isValidHash(s) {
  return UUID_REGEX.test(s);
}

export async function createToken(payload, options) {
  return jwt.sign(payload, secret(), options);
}

export async function parseToken(token, options) {
  return jwt.verify(token, secret(), options);
}

export function checkPassword(password, hash) {
  return bcrypt.compare(password, hash);
}