const config = require('@config/index')
const bcrypt = require('bcrypt')
const {
  toInt
} = require('@libs/route-utils')

/**
 * hash password func
 * @param {string} pass password string
 * @return {string}
 */
const hashPassword = async (pass = '') => {
  if (typeof pass !== 'string' || pass.trim().length === 0) return null
  let saltRound = toInt(config.salt_round, 1, 1)
  // gen salt
  let salt = await new Promise((resolve, reject) => {
    bcrypt.genSalt(saltRound, (err, saltStr) => {
      if (err) {
        reject(err)
        return
      }
      resolve(saltStr)
    })
  })

  let passHash = new Promise((resolve, reject) => {
    bcrypt.hash(pass, salt, (err, hash) => {
      if (err) {
        reject(err)
        return
      }
      resolve(hash)
    })
  })

  return passHash
}

/**
 * compare password and hash
 * @param {string} password password string
 * @param {string} hash hash string
 * @return {boolean}
 */
const comparePassword = async (password = '', hash = '') => {
  if (typeof password !== 'string' || password.trim().length === 0) return false
  if (typeof hash !== 'string' || hash.trim().length === 0) return false
  let check = new Promise((resolve, reject) => {
    bcrypt.compare(password, hash, (err, res) => {
      if (err) {
        resolve(false)
        return
      }
      resolve(res)
    })
  })

  return !!check
}

module.exports = {
  hashPassword,
  comparePassword
}