import * as express from 'express'
import 'express-validator'
import { body, param, query, ValidationChain } from 'express-validator/check'
import { UserRight, VideoChangeOwnershipStatus, VideoPrivacy } from '../../../../shared'
import {
  isBooleanValid,
  isDateValid,
  isIdOrUUIDValid,
  isIdValid,
  isUUIDValid,
  toArray,
  toIntOrNull,
  toValueOrNull
} from '../../../helpers/custom-validators/misc'
import {
  checkUserCanManageVideo,
  isScheduleVideoUpdatePrivacyValid,
  isVideoCategoryValid,
  isVideoChannelOfAccountExist,
  isVideoDescriptionValid,
  isVideoExist,
  isVideoFile,
  isVideoFilterValid,
  isVideoImage,
  isVideoLanguageValid,
  isVideoLicenceValid,
  isVideoNameValid,
  isVideoPrivacyValid,
  isVideoSupportValid,
  isVideoTagsValid
} from '../../../helpers/custom-validators/videos'
import { getDurationFromVideoFile } from '../../../helpers/ffmpeg-utils'
import { logger } from '../../../helpers/logger'
import { CONFIG, CONSTRAINTS_FIELDS } from '../../../initializers'
import { authenticatePromiseIfNeeded } from '../../oauth'
import { areValidationErrors } from '../utils'
import { cleanUpReqFiles } from '../../../helpers/express-utils'
import { VideoModel } from '../../../models/video/video'
import { UserModel } from '../../../models/account/user'
import { checkUserCanTerminateOwnershipChange, doesChangeVideoOwnershipExist } from '../../../helpers/custom-validators/video-ownership'
import { VideoChangeOwnershipAccept } from '../../../../shared/models/videos/video-change-ownership-accept.model'
import { VideoChangeOwnershipModel } from '../../../models/video/video-change-ownership'
import { AccountModel } from '../../../models/account/account'
import { VideoFetchType } from '../../../helpers/video'
import { isNSFWQueryValid, isNumberArray, isStringArray } from '../../../helpers/custom-validators/search'
import { getServerActor } from '../../../helpers/utils'

const videosAddValidator = getCommonVideoAttributes().concat([
  body('videofile')
    .custom((value, { req }) => isVideoFile(req.files)).withMessage(
      'This file is not supported or too large. Please, make sure it is of the following type: '
      + CONSTRAINTS_FIELDS.VIDEOS.EXTNAME.join(', ')
    ),
  body('name').custom(isVideoNameValid).withMessage('Should have a valid name'),
  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 cleanUpReqFiles(req)
    if (areErrorsInScheduleUpdate(req, res)) return cleanUpReqFiles(req)

    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 cleanUpReqFiles(req)

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

      return cleanUpReqFiles(req)
    }

    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.' })

      return cleanUpReqFiles(req)
    }

    videoFile['duration'] = duration

    return next()
  }
])

const videosUpdateValidator = getCommonVideoAttributes().concat([
  param('id').custom(isIdOrUUIDValid).not().isEmpty().withMessage('Should have a valid id'),
  body('name')
    .optional()
    .custom(isVideoNameValid).withMessage('Should have a valid name'),
  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 cleanUpReqFiles(req)
    if (areErrorsInScheduleUpdate(req, res)) return cleanUpReqFiles(req)
    if (!await isVideoExist(req.params.id, res)) return cleanUpReqFiles(req)

    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 cleanUpReqFiles(req)

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

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

    return next()
  }
])

async function checkVideoFollowConstraints (req: express.Request, res: express.Response, next: express.NextFunction) {
  const video: VideoModel = res.locals.video

  // Anybody can watch local videos
  if (video.isOwned() === true) return next()

  // Logged user
  if (res.locals.oauth) {
    // Users can search or watch remote videos
    if (CONFIG.SEARCH.REMOTE_URI.USERS === true) return next()
  }

  // Anybody can search or watch remote videos
  if (CONFIG.SEARCH.REMOTE_URI.ANONYMOUS === true) return next()

  // Check our instance follows an actor that shared this video
  const serverActor = await getServerActor()
  if (await VideoModel.checkVideoHasInstanceFollow(video.id, serverActor.id) === true) return next()

  return res.status(403)
            .json({
              error: 'Cannot get this video regarding follow constraints.'
            })
}

const videosCustomGetValidator = (fetchType: VideoFetchType) => {
  return [
    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, fetchType)) return

      const video: VideoModel = res.locals.video

      // Video private or blacklisted
      if (video.privacy === VideoPrivacy.PRIVATE || video.VideoBlacklist) {
        await authenticatePromiseIfNeeded(req, res)

        const user: UserModel = res.locals.oauth ? res.locals.oauth.token.User : null

        // Only the owner or a user that have blacklist rights can see the video
        if (
          !user ||
          (video.VideoChannel.Account.userId !== user.id && !user.hasRight(UserRight.MANAGE_VIDEO_BLACKLIST))
        ) {
          return res.status(403)
                    .json({ error: 'Cannot get this private or blacklisted video.' })
        }

        return next()
      }

      // 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()
      }
    }
  ]
}

const videosGetValidator = videosCustomGetValidator('all')

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

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

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

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

    const nextOwner = await AccountModel.loadLocalByName(req.body.username)
    if (!nextOwner) {
      res.status(400)
        .json({ error: 'Changing video ownership to a remote account is not supported yet' })

      return
    }
    res.locals.nextOwner = nextOwner

    return next()
  }
]

const videosTerminateChangeOwnershipValidator = [
  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 changeOwnership parameters', { parameters: req.params })

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

    // Check if the user who did the request is able to change the ownership of the video
    if (!checkUserCanTerminateOwnershipChange(res.locals.oauth.token.User, res.locals.videoChangeOwnership, res)) return

    return next()
  },
  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
    const videoChangeOwnership = res.locals.videoChangeOwnership as VideoChangeOwnershipModel

    if (videoChangeOwnership.status === VideoChangeOwnershipStatus.WAITING) {
      return next()
    } else {
      res.status(403)
        .json({ error: 'Ownership already accepted or refused' })

      return
    }
  }
]

const videosAcceptChangeOwnershipValidator = [
  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
    const body = req.body as VideoChangeOwnershipAccept
    if (!await isVideoChannelOfAccountExist(body.channelId, res.locals.oauth.token.User, res)) return

    const user = res.locals.oauth.token.User
    const videoChangeOwnership = res.locals.videoChangeOwnership as VideoChangeOwnershipModel
    const isAble = await user.isAbleToUploadVideo(videoChangeOwnership.Video.getOriginalFile())
    if (isAble === false) {
      res.status(403)
        .json({ error: 'The user video quota is exceeded with this video.' })

      return
    }

    return next()
  }
]

function getCommonVideoAttributes () {
  return [
    body('thumbnailfile')
      .custom((value, { req }) => isVideoImage(req.files, 'thumbnailfile')).withMessage(
      'This thumbnail file is not supported or too large. 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 or too large. Please, make sure it is of the following type: '
      + CONSTRAINTS_FIELDS.VIDEOS.IMAGE.EXTNAME.join(', ')
    ),

    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('waitTranscoding')
      .optional()
      .toBoolean()
      .custom(isBooleanValid).withMessage('Should have a valid wait transcoding 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('scheduleUpdate')
      .optional()
      .customSanitizer(toValueOrNull),
    body('scheduleUpdate.updateAt')
      .optional()
      .custom(isDateValid).withMessage('Should have a valid schedule update date'),
    body('scheduleUpdate.privacy')
      .optional()
      .toInt()
      .custom(isScheduleVideoUpdatePrivacyValid).withMessage('Should have correct schedule update privacy')
  ] as (ValidationChain | express.Handler)[]
}

const commonVideosFiltersValidator = [
  query('categoryOneOf')
    .optional()
    .customSanitizer(toArray)
    .custom(isNumberArray).withMessage('Should have a valid one of category array'),
  query('licenceOneOf')
    .optional()
    .customSanitizer(toArray)
    .custom(isNumberArray).withMessage('Should have a valid one of licence array'),
  query('languageOneOf')
    .optional()
    .customSanitizer(toArray)
    .custom(isStringArray).withMessage('Should have a valid one of language array'),
  query('tagsOneOf')
    .optional()
    .customSanitizer(toArray)
    .custom(isStringArray).withMessage('Should have a valid one of tags array'),
  query('tagsAllOf')
    .optional()
    .customSanitizer(toArray)
    .custom(isStringArray).withMessage('Should have a valid all of tags array'),
  query('nsfw')
    .optional()
    .custom(isNSFWQueryValid).withMessage('Should have a valid NSFW attribute'),
  query('filter')
    .optional()
    .custom(isVideoFilterValid).withMessage('Should have a valid filter attribute'),

  (req: express.Request, res: express.Response, next: express.NextFunction) => {
    logger.debug('Checking commons video filters query', { parameters: req.query })

    if (areValidationErrors(req, res)) return

    const user: UserModel = res.locals.oauth ? res.locals.oauth.token.User : undefined
    if (req.query.filter === 'all-local' && (!user || user.hasRight(UserRight.SEE_ALL_VIDEOS) === false)) {
      res.status(401)
         .json({ error: 'You are not allowed to see all local videos.' })

      return
    }

    return next()
  }
]

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

export {
  videosAddValidator,
  videosUpdateValidator,
  videosGetValidator,
  checkVideoFollowConstraints,
  videosCustomGetValidator,
  videosRemoveValidator,

  videosChangeOwnershipValidator,
  videosTerminateChangeOwnershipValidator,
  videosAcceptChangeOwnershipValidator,

  getCommonVideoAttributes,

  commonVideosFiltersValidator
}

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

function areErrorsInScheduleUpdate (req: express.Request, res: express.Response) {
  if (req.body.scheduleUpdate) {
    if (!req.body.scheduleUpdate.updateAt) {
      logger.warn('Invalid parameters: scheduleUpdate.updateAt is mandatory.')

      res.status(400)
         .json({ error: 'Schedule update at is mandatory.' })

      return true
    }
  }

  return false
}