'use strict'

const validator = require('express-validator').validator

const constants = require('../../initializers/constants')
const usersValidators = require('./users')
const miscValidators = require('./misc')
const VIDEOS_CONSTRAINTS_FIELDS = constants.CONSTRAINTS_FIELDS.VIDEOS
const VIDEO_ABUSES_CONSTRAINTS_FIELDS = constants.CONSTRAINTS_FIELDS.VIDEO_ABUSES

const videosValidators = {
  isVideoAuthorValid,
  isVideoDateValid,
  isVideoDescriptionValid,
  isVideoDurationValid,
  isVideoInfoHashValid,
  isVideoNameValid,
  isVideoTagsValid,
  isVideoThumbnailValid,
  isVideoThumbnailDataValid,
  isVideoExtnameValid,
  isVideoRemoteIdValid,
  isVideoAbuseReasonValid,
  isVideoAbuseReporterUsernameValid,
  isVideoFile
}

function isVideoAuthorValid (value) {
  return usersValidators.isUserUsernameValid(value)
}

function isVideoDateValid (value) {
  return validator.isDate(value)
}

function isVideoDescriptionValid (value) {
  return validator.isLength(value, VIDEOS_CONSTRAINTS_FIELDS.DESCRIPTION)
}

function isVideoDurationValid (value) {
  return validator.isInt(value + '', VIDEOS_CONSTRAINTS_FIELDS.DURATION)
}

function isVideoExtnameValid (value) {
  return VIDEOS_CONSTRAINTS_FIELDS.EXTNAME.indexOf(value) !== -1
}

function isVideoInfoHashValid (value) {
  return validator.isLength(value, VIDEOS_CONSTRAINTS_FIELDS.INFO_HASH)
}

function isVideoNameValid (value) {
  return validator.isLength(value, VIDEOS_CONSTRAINTS_FIELDS.NAME)
}

function isVideoTagsValid (tags) {
  return miscValidators.isArray(tags) &&
         validator.isInt(tags.length, VIDEOS_CONSTRAINTS_FIELDS.TAGS) &&
         tags.every(function (tag) {
           return validator.isAlphanumeric(tag) &&
                  validator.isLength(tag, VIDEOS_CONSTRAINTS_FIELDS.TAG)
         })
}

function isVideoThumbnailValid (value) {
  return validator.isLength(value, VIDEOS_CONSTRAINTS_FIELDS.THUMBNAIL)
}

function isVideoThumbnailDataValid (value) {
  return validator.isByteLength(value, VIDEOS_CONSTRAINTS_FIELDS.THUMBNAIL_DATA)
}

function isVideoRemoteIdValid (value) {
  return validator.isUUID(value, 4)
}

function isVideoAbuseReasonValid (value) {
  return validator.isLength(value, VIDEO_ABUSES_CONSTRAINTS_FIELDS.REASON)
}

function isVideoAbuseReporterUsernameValid (value) {
  return usersValidators.isUserUsernameValid(value)
}

function isVideoFile (value, files) {
  // Should have files
  if (!files) return false

  // Should have videofile file
  const videofile = files.videofile
  if (!videofile || videofile.length === 0) return false

  // The file should exist
  const file = videofile[0]
  if (!file || !file.originalname) return false

  return new RegExp('^video/(webm|mp4|ogg)$', 'i').test(file.mimetype)
}

// ---------------------------------------------------------------------------

module.exports = videosValidators