import * as express from 'express'
import 'express-validator'
import 'multer'
import * as validator from 'validator'
import { CONSTRAINTS_FIELDS } from '../../initializers/constants'
import { VideoChannelModel } from '../../models/video/video-channel'
import { exists } from './misc'

const VIDEO_CHANNELS_CONSTRAINTS_FIELDS = CONSTRAINTS_FIELDS.VIDEO_CHANNELS

function isVideoChannelDescriptionValid (value: string) {
  return value === null || validator.isLength(value, VIDEO_CHANNELS_CONSTRAINTS_FIELDS.DESCRIPTION)
}

function isVideoChannelNameValid (value: string) {
  return exists(value) && validator.isLength(value, VIDEO_CHANNELS_CONSTRAINTS_FIELDS.NAME)
}

function isVideoChannelSupportValid (value: string) {
  return value === null || (exists(value) && validator.isLength(value, VIDEO_CHANNELS_CONSTRAINTS_FIELDS.SUPPORT))
}

async function doesLocalVideoChannelNameExist (name: string, res: express.Response) {
  const videoChannel = await VideoChannelModel.loadLocalByNameAndPopulateAccount(name)

  return processVideoChannelExist(videoChannel, res)
}

async function doesVideoChannelIdExist (id: number, res: express.Response) {
  const videoChannel = await VideoChannelModel.loadAndPopulateAccount(+id)

  return processVideoChannelExist(videoChannel, res)
}

async function doesVideoChannelNameWithHostExist (nameWithDomain: string, res: express.Response) {
  const videoChannel = await VideoChannelModel.loadByNameWithHostAndPopulateAccount(nameWithDomain)

  return processVideoChannelExist(videoChannel, res)
}

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

export {
  doesVideoChannelNameWithHostExist,
  doesLocalVideoChannelNameExist,
  isVideoChannelDescriptionValid,
  isVideoChannelNameValid,
  isVideoChannelSupportValid,
  doesVideoChannelIdExist
}

function processVideoChannelExist (videoChannel: VideoChannelModel, res: express.Response) {
  if (!videoChannel) {
    ``

    return false
  }

  res.locals.videoChannel = videoChannel
  return true
}