import * as express from 'express'
import 'express-validator'
import { body, param, query } from 'express-validator/check'
import { UserRight, VideoPrivacy } from '../../../shared'
import { isBooleanValid, isIdOrUUIDValid, isIdValid, isUUIDValid, toIntOrNull, toValueOrNull } from '../../helpers/custom-validators/misc'
import {
  isVideoAbuseReasonValid,
  isVideoCategoryValid,
  isVideoChannelOfAccountExist,
  isVideoDescriptionValid,
  isVideoExist,
  isVideoFile,
  isVideoImage,
  isVideoLanguageValid,
  isVideoLicenceValid,
  isVideoNameValid,
  isVideoPrivacyValid,
  isVideoRatingTypeValid,
  isVideoSupportValid,
  isVideoTagsValid
} from '../../helpers/custom-validators/videos'
import { getDurationFromVideoFile } from '../../helpers/ffmpeg-utils'
import { logger } from '../../helpers/logger'
import { CONSTRAINTS_FIELDS } from '../../initializers'
import { UserModel } from '../../models/account/user'
import { VideoModel } from '../../models/video/video'
import { VideoShareModel } from '../../models/video/video-share'
import { authenticate } from '../oauth'
import { areValidationErrors } from './utils'

const videosAddValidator = [
  body('videofile').custom((value, { req }) => isVideoFile(req.files)).withMessage(
    'This file is not supported. Please, make sure it is of the following type : '
    + CONSTRAINTS_FIELDS.VIDEOS.EXTNAME.join(', ')
  ),
  body('thumbnailfile').custom((value, { req }) => isVideoImage(req.files, 'thumbnailfile')).withMessage(
    'This thumbnail file is not supported. Please, make sure it is of the following type : '
    + CONSTRAINTS_FIELDS.VIDEOS.IMAGE.EXTNAME.join(', ')
  ),
  body('previewfile').custom((value, { req }) => isVideoImage(req.files, 'previewfile')).withMessage(
    'This preview file is not supported. Please, make sure it is of the following type : '
    + CONSTRAINTS_FIELDS.VIDEOS.IMAGE.EXTNAME.join(', ')
  ),
  body('name').custom(isVideoNameValid).withMessage('Should have a valid name'),
  body('category')
    .optional()
    .customSanitizer(toIntOrNull)
    .custom(isVideoCategoryValid).withMessage('Should have a valid category'),
  body('licence')
    .optional()
    .customSanitizer(toIntOrNull)
    .custom(isVideoLicenceValid).withMessage('Should have a valid licence'),
  body('language')
    .optional()
    .customSanitizer(toValueOrNull)
    .custom(isVideoLanguageValid).withMessage('Should have a valid language'),
  body('nsfw')
    .toBoolean()
    .custom(isBooleanValid).withMessage('Should have a valid NSFW attribute'),
  body('description')
    .optional()
    .customSanitizer(toValueOrNull)
    .custom(isVideoDescriptionValid).withMessage('Should have a valid description'),
  body('support')
    .optional()
    .customSanitizer(toValueOrNull)
    .custom(isVideoSupportValid).withMessage('Should have a valid support text'),
  body('tags')
    .optional()
    .customSanitizer(toValueOrNull)
    .custom(isVideoTagsValid).withMessage('Should have correct tags'),
  body('commentsEnabled')
    .toBoolean()
    .custom(isBooleanValid).withMessage('Should have comments enabled boolean'),
  body('privacy')
    .optional()
    .toInt()
    .custom(isVideoPrivacyValid).withMessage('Should have correct video privacy'),
  body('channelId')
    .toInt()
    .custom(isIdValid)
    .withMessage('Should have correct video channel id'),

  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
    logger.debug('Checking videosAdd parameters', { parameters: req.body, files: req.files })

    if (areValidationErrors(req, res)) return
    if (areErrorsInVideoImageFiles(req, res)) return

    const videoFile: Express.Multer.File = req.files['videofile'][0]
    const user = res.locals.oauth.token.User

    if (!await isVideoChannelOfAccountExist(req.body.channelId, user, res)) return

    const isAble = await user.isAbleToUploadVideo(videoFile)
    if (isAble === false) {
      res.status(403)
         .json({ error: 'The user video quota is exceeded with this video.' })
         .end()

      return
    }

    let duration: number

    try {
      duration = await getDurationFromVideoFile(videoFile.path)
    } catch (err) {
      logger.error('Invalid input file in videosAddValidator.', { err })
      res.status(400)
         .json({ error: 'Invalid input file.' })
         .end()

      return
    }

    videoFile['duration'] = duration

    return next()
  }
]

const videosUpdateValidator = [
  param('id').custom(isIdOrUUIDValid).not().isEmpty().withMessage('Should have a valid id'),
  body('thumbnailfile').custom((value, { req }) => isVideoImage(req.files, 'thumbnailfile')).withMessage(
    'This thumbnail file is not supported. Please, make sure it is of the following type : '
    + CONSTRAINTS_FIELDS.VIDEOS.IMAGE.EXTNAME.join(', ')
  ),
  body('previewfile').custom((value, { req }) => isVideoImage(req.files, 'previewfile')).withMessage(
    'This preview file is not supported. Please, make sure it is of the following type : '
    + CONSTRAINTS_FIELDS.VIDEOS.IMAGE.EXTNAME.join(', ')
  ),
  body('name')
    .optional()
    .custom(isVideoNameValid).withMessage('Should have a valid name'),
  body('category')
    .optional()
    .customSanitizer(toIntOrNull)
    .custom(isVideoCategoryValid).withMessage('Should have a valid category'),
  body('licence')
    .optional()
    .customSanitizer(toIntOrNull)
    .custom(isVideoLicenceValid).withMessage('Should have a valid licence'),
  body('language')
    .optional()
    .customSanitizer(toValueOrNull)
    .custom(isVideoLanguageValid).withMessage('Should have a valid language'),
  body('nsfw')
    .optional()
    .toBoolean()
    .custom(isBooleanValid).withMessage('Should have a valid NSFW attribute'),
  body('privacy')
    .optional()
    .toInt()
    .custom(isVideoPrivacyValid).withMessage('Should have correct video privacy'),
  body('description')
    .optional()
    .customSanitizer(toValueOrNull)
    .custom(isVideoDescriptionValid).withMessage('Should have a valid description'),
  body('support')
    .optional()
    .customSanitizer(toValueOrNull)
    .custom(isVideoSupportValid).withMessage('Should have a valid support text'),
  body('tags')
    .optional()
    .customSanitizer(toValueOrNull)
    .custom(isVideoTagsValid).withMessage('Should have correct tags'),
  body('commentsEnabled')
    .optional()
    .toBoolean()
    .custom(isBooleanValid).withMessage('Should have comments enabled boolean'),
  body('channelId')
    .optional()
    .toInt()
    .custom(isIdValid).withMessage('Should have correct video channel id'),

  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
    logger.debug('Checking videosUpdate parameters', { parameters: req.body })

    if (areValidationErrors(req, res)) return
    if (areErrorsInVideoImageFiles(req, res)) return
    if (!await isVideoExist(req.params.id, res)) return

    const video = res.locals.video

    // Check if the user who did the request is able to update the video
    const user = res.locals.oauth.token.User
    if (!checkUserCanManageVideo(user, res.locals.video, UserRight.UPDATE_ANY_VIDEO, res)) return

    if (video.privacy !== VideoPrivacy.PRIVATE && req.body.privacy === VideoPrivacy.PRIVATE) {
      return res.status(409)
        .json({ error: 'Cannot set "private" a video that was not private anymore.' })
        .end()
    }

    if (req.body.channelId && !await isVideoChannelOfAccountExist(req.body.channelId, user, res)) return

    return next()
  }
]

const videosGetValidator = [
  param('id').custom(isIdOrUUIDValid).not().isEmpty().withMessage('Should have a valid id'),

  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
    logger.debug('Checking videosGet parameters', { parameters: req.params })

    if (areValidationErrors(req, res)) return
    if (!await isVideoExist(req.params.id, res)) return

    const video = res.locals.video

    // Video is public, anyone can access it
    if (video.privacy === VideoPrivacy.PUBLIC) return next()

    // Video is unlisted, check we used the uuid to fetch it
    if (video.privacy === VideoPrivacy.UNLISTED) {
      if (isUUIDValid(req.params.id)) return next()

      // Don't leak this unlisted video
      return res.status(404).end()
    }

    // Video is private, check the user
    authenticate(req, res, () => {
      if (video.VideoChannel.Account.userId !== res.locals.oauth.token.User.id) {
        return res.status(403)
          .json({ error: 'Cannot get this private video of another user' })
          .end()
      }

      return next()
    })
  }
]

const videosRemoveValidator = [
  param('id').custom(isIdOrUUIDValid).not().isEmpty().withMessage('Should have a valid id'),

  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
    logger.debug('Checking videosRemove parameters', { parameters: req.params })

    if (areValidationErrors(req, res)) return
    if (!await isVideoExist(req.params.id, res)) return

    // Check if the user who did the request is able to delete the video
    if (!checkUserCanManageVideo(res.locals.oauth.token.User, res.locals.video, UserRight.REMOVE_ANY_VIDEO, res)) return

    return next()
  }
]

const videosSearchValidator = [
  query('search').not().isEmpty().withMessage('Should have a valid search'),

  (req: express.Request, res: express.Response, next: express.NextFunction) => {
    logger.debug('Checking videosSearch parameters', { parameters: req.params })

    if (areValidationErrors(req, res)) return

    return next()
  }
]

const videoAbuseReportValidator = [
  param('id').custom(isIdOrUUIDValid).not().isEmpty().withMessage('Should have a valid id'),
  body('reason').custom(isVideoAbuseReasonValid).withMessage('Should have a valid reason'),

  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
    logger.debug('Checking videoAbuseReport parameters', { parameters: req.body })

    if (areValidationErrors(req, res)) return
    if (!await isVideoExist(req.params.id, res)) return

    return next()
  }
]

const videoRateValidator = [
  param('id').custom(isIdOrUUIDValid).not().isEmpty().withMessage('Should have a valid id'),
  body('rating').custom(isVideoRatingTypeValid).withMessage('Should have a valid rate type'),

  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
    logger.debug('Checking videoRate parameters', { parameters: req.body })

    if (areValidationErrors(req, res)) return
    if (!await isVideoExist(req.params.id, res)) return

    return next()
  }
]

const videosShareValidator = [
  param('id').custom(isIdOrUUIDValid).not().isEmpty().withMessage('Should have a valid id'),
  param('accountId').custom(isIdValid).not().isEmpty().withMessage('Should have a valid account id'),

  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
    logger.debug('Checking videoShare parameters', { parameters: req.params })

    if (areValidationErrors(req, res)) return
    if (!await isVideoExist(req.params.id, res)) return

    const share = await VideoShareModel.load(req.params.accountId, res.locals.video.id, undefined)
    if (!share) {
      return res.status(404)
        .end()
    }

    res.locals.videoShare = share
    return next()
  }
]

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

export {
  videosAddValidator,
  videosUpdateValidator,
  videosGetValidator,
  videosRemoveValidator,
  videosSearchValidator,
  videosShareValidator,

  videoAbuseReportValidator,

  videoRateValidator
}

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

function checkUserCanManageVideo (user: UserModel, video: VideoModel, right: UserRight, res: express.Response) {
  // Retrieve the user who did the request
  if (video.isOwned() === false) {
    res.status(403)
              .json({ error: 'Cannot manage a video of another server.' })
              .end()
    return false
  }

  // Check if the user can delete the video
  // The user can delete it if he has the right
  // Or if s/he is the video's account
  const account = video.VideoChannel.Account
  if (user.hasRight(right) === false && account.userId !== user.id) {
    res.status(403)
              .json({ error: 'Cannot manage a video of another user.' })
              .end()
    return false
  }

  return true
}

function areErrorsInVideoImageFiles (req: express.Request, res: express.Response) {
  // Files are optional
  if (!req.files) return false

  for (const imageField of [ 'thumbnail', 'preview' ]) {
    if (!req.files[ imageField ]) continue

    const imageFile = req.files[ imageField ][ 0 ] as Express.Multer.File
    if (imageFile.size > CONSTRAINTS_FIELDS.VIDEOS.IMAGE.FILE_SIZE.max) {
      res.status(400)
        .send({ error: `The size of the ${imageField} is too big (>${CONSTRAINTS_FIELDS.VIDEOS.IMAGE.FILE_SIZE.max}).` })
        .end()
      return true
    }
  }

  return false
}