'use strict'

// Libraries
const { customAlphabet } = require('nanoid')
const StringCrypto = require('string-crypto')
const path = require('path')

// NanoId with custom alphabet
const newId = (len) => {
  const nanoid = customAlphabet(
    'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789',
    len || 21
  )
  return nanoid()
}

// Remove all _id
const removeFieldByName = (o, fieldName) => {
  delete o[fieldName]
  for (let v of Object.values(o))
    if (v instanceof Object) removeFieldByName(v, fieldName)
}

// Clean object from unnecesary fields
const fieldsToRemove = ['_id']
const cleanObject = (o) => {
  const obj = JSON.parse(JSON.stringify(o))
  fieldsToRemove.forEach((f) => {
    removeFieldByName(obj, f)
  })
  return obj
}

// Securize sensible data
const cryptoOptions = {
  salt: process.env.CRYPTO_SALT,
  iterations: parseInt(process.env.CRYPTO_ITERATIONS),
  digest: process.env.CRYPTO_DIGEST // one of: 'blake2b512' | 'blake2s256' | 'md4' | 'md5' | 'md5-sha1' | 'mdc2' | 'ripemd160' | 'sha1' | 'sha224' | 'sha256' | 'sha3-224' | 'sha3-256' | 'sha3-384' | 'sha3-512' | 'sha384' | 'sha512' | 'sha512-224' | 'sha512-256' | 'sm3' | 'whirlpool';
}
const stringCypto = new StringCrypto(cryptoOptions)
const encryptString = (value, password) => {
  return stringCypto.encryptString(value, password)
}

const decryptString = (value, password) => {
  return stringCypto.decryptString(value, password)
}

// Split array into pieces
const chunk = (arr, size) =>
  arr.reduce(
    (acc, _, i) => (i % size ? acc : [...acc, arr.slice(i, i + size)]),
    []
  )

// Sleep
const sleep = (segundos) => {
  return new Promise((resolve) => setTimeout(resolve, segundos * 1000))
}

// Get file name
const getFileName = (f) => path.basename(f, '.js')

module.exports = {
  newId,
  removeFieldByName,
  cleanObject,
  encryptString,
  decryptString,
  chunk,
  sleep,
  getFileName
}