import express from 'express'
import { body, param, query, ValidationChain } from 'express-validator'
import { ExpressPromiseHandler } from '@server/types/express-handler'
import { MUserAccountId } from '@server/types/models'
import { forceNumber } from '@shared/core-utils'
import {
  HttpStatusCode,
  UserRight,
  VideoPlaylistCreate,
  VideoPlaylistPrivacy,
  VideoPlaylistType,
  VideoPlaylistUpdate
} from '@shared/models'
import {
  isArrayOf,
  isIdOrUUIDValid,
  isIdValid,
  isUUIDValid,
  toCompleteUUID,
  toIntArray,
  toIntOrNull,
  toValueOrNull
} from '../../../helpers/custom-validators/misc'
import {
  isVideoPlaylistDescriptionValid,
  isVideoPlaylistNameValid,
  isVideoPlaylistPrivacyValid,
  isVideoPlaylistTimestampValid,
  isVideoPlaylistTypeValid
} from '../../../helpers/custom-validators/video-playlists'
import { isVideoImageValid } from '../../../helpers/custom-validators/videos'
import { cleanUpReqFiles } from '../../../helpers/express-utils'
import { CONSTRAINTS_FIELDS } from '../../../initializers/constants'
import { VideoPlaylistElementModel } from '../../../models/video/video-playlist-element'
import { MVideoPlaylist } from '../../../types/models/video/video-playlist'
import { authenticatePromise } from '../../auth'
import {
  areValidationErrors,
  doesVideoChannelIdExist,
  doesVideoExist,
  doesVideoPlaylistExist,
  isValidPlaylistIdParam,
  VideoPlaylistFetchType
} from '../shared'

const videoPlaylistsAddValidator = getCommonPlaylistEditAttributes().concat([
  body('displayName')
    .custom(isVideoPlaylistNameValid),

  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
    if (areValidationErrors(req, res)) return cleanUpReqFiles(req)

    const body: VideoPlaylistCreate = req.body
    if (body.videoChannelId && !await doesVideoChannelIdExist(body.videoChannelId, res)) return cleanUpReqFiles(req)

    if (
      !body.videoChannelId &&
      (body.privacy === VideoPlaylistPrivacy.PUBLIC || body.privacy === VideoPlaylistPrivacy.UNLISTED)
    ) {
      cleanUpReqFiles(req)

      return res.fail({ message: 'Cannot set "public" or "unlisted" a playlist that is not assigned to a channel.' })
    }

    return next()
  }
])

const videoPlaylistsUpdateValidator = getCommonPlaylistEditAttributes().concat([
  isValidPlaylistIdParam('playlistId'),

  body('displayName')
    .optional()
    .custom(isVideoPlaylistNameValid),

  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
    if (areValidationErrors(req, res)) return cleanUpReqFiles(req)

    if (!await doesVideoPlaylistExist(req.params.playlistId, res, 'all')) return cleanUpReqFiles(req)

    const videoPlaylist = getPlaylist(res)

    if (!checkUserCanManageVideoPlaylist(res.locals.oauth.token.User, videoPlaylist, UserRight.REMOVE_ANY_VIDEO_PLAYLIST, res)) {
      return cleanUpReqFiles(req)
    }

    const body: VideoPlaylistUpdate = req.body

    const newPrivacy = body.privacy || videoPlaylist.privacy
    if (newPrivacy === VideoPlaylistPrivacy.PUBLIC &&
      (
        (!videoPlaylist.videoChannelId && !body.videoChannelId) ||
        body.videoChannelId === null
      )
    ) {
      cleanUpReqFiles(req)

      return res.fail({ message: 'Cannot set "public" a playlist that is not assigned to a channel.' })
    }

    if (videoPlaylist.type === VideoPlaylistType.WATCH_LATER) {
      cleanUpReqFiles(req)

      return res.fail({ message: 'Cannot update a watch later playlist.' })
    }

    if (body.videoChannelId && !await doesVideoChannelIdExist(body.videoChannelId, res)) return cleanUpReqFiles(req)

    return next()
  }
])

const videoPlaylistsDeleteValidator = [
  isValidPlaylistIdParam('playlistId'),

  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
    if (areValidationErrors(req, res)) return

    if (!await doesVideoPlaylistExist(req.params.playlistId, res)) return

    const videoPlaylist = getPlaylist(res)
    if (videoPlaylist.type === VideoPlaylistType.WATCH_LATER) {
      return res.fail({ message: 'Cannot delete a watch later playlist.' })
    }

    if (!checkUserCanManageVideoPlaylist(res.locals.oauth.token.User, videoPlaylist, UserRight.REMOVE_ANY_VIDEO_PLAYLIST, res)) {
      return
    }

    return next()
  }
]

const videoPlaylistsGetValidator = (fetchType: VideoPlaylistFetchType) => {
  return [
    isValidPlaylistIdParam('playlistId'),

    async (req: express.Request, res: express.Response, next: express.NextFunction) => {
      if (areValidationErrors(req, res)) return

      if (!await doesVideoPlaylistExist(req.params.playlistId, res, fetchType)) return

      const videoPlaylist = res.locals.videoPlaylistFull || res.locals.videoPlaylistSummary

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

        return res.fail({
          status: HttpStatusCode.NOT_FOUND_404,
          message: 'Playlist not found'
        })
      }

      if (videoPlaylist.privacy === VideoPlaylistPrivacy.PRIVATE) {
        await authenticatePromise(req, res)

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

        if (
          !user ||
          (videoPlaylist.OwnerAccount.id !== user.Account.id && !user.hasRight(UserRight.UPDATE_ANY_VIDEO_PLAYLIST))
        ) {
          return res.fail({
            status: HttpStatusCode.FORBIDDEN_403,
            message: 'Cannot get this private video playlist.'
          })
        }

        return next()
      }

      return next()
    }
  ]
}

const videoPlaylistsSearchValidator = [
  query('search')
    .optional()
    .not().isEmpty(),

  (req: express.Request, res: express.Response, next: express.NextFunction) => {
    if (areValidationErrors(req, res)) return

    return next()
  }
]

const videoPlaylistsAddVideoValidator = [
  isValidPlaylistIdParam('playlistId'),

  body('videoId')
    .customSanitizer(toCompleteUUID)
    .custom(isIdOrUUIDValid).withMessage('Should have a valid video id/uuid/short uuid'),
  body('startTimestamp')
    .optional()
    .custom(isVideoPlaylistTimestampValid),
  body('stopTimestamp')
    .optional()
    .custom(isVideoPlaylistTimestampValid),

  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
    if (areValidationErrors(req, res)) return

    if (!await doesVideoPlaylistExist(req.params.playlistId, res, 'all')) return
    if (!await doesVideoExist(req.body.videoId, res, 'only-video')) return

    const videoPlaylist = getPlaylist(res)

    if (!checkUserCanManageVideoPlaylist(res.locals.oauth.token.User, videoPlaylist, UserRight.UPDATE_ANY_VIDEO_PLAYLIST, res)) {
      return
    }

    return next()
  }
]

const videoPlaylistsUpdateOrRemoveVideoValidator = [
  isValidPlaylistIdParam('playlistId'),
  param('playlistElementId')
    .customSanitizer(toCompleteUUID)
    .custom(isIdValid).withMessage('Should have an element id/uuid/short uuid'),
  body('startTimestamp')
    .optional()
    .custom(isVideoPlaylistTimestampValid),
  body('stopTimestamp')
    .optional()
    .custom(isVideoPlaylistTimestampValid),

  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
    if (areValidationErrors(req, res)) return

    if (!await doesVideoPlaylistExist(req.params.playlistId, res, 'all')) return

    const videoPlaylist = getPlaylist(res)

    const videoPlaylistElement = await VideoPlaylistElementModel.loadById(req.params.playlistElementId)
    if (!videoPlaylistElement) {
      res.fail({
        status: HttpStatusCode.NOT_FOUND_404,
        message: 'Video playlist element not found'
      })
      return
    }
    res.locals.videoPlaylistElement = videoPlaylistElement

    if (!checkUserCanManageVideoPlaylist(res.locals.oauth.token.User, videoPlaylist, UserRight.UPDATE_ANY_VIDEO_PLAYLIST, res)) return

    return next()
  }
]

const videoPlaylistElementAPGetValidator = [
  isValidPlaylistIdParam('playlistId'),
  param('playlistElementId')
    .custom(isIdValid),

  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
    if (areValidationErrors(req, res)) return

    const playlistElementId = forceNumber(req.params.playlistElementId)
    const playlistId = req.params.playlistId

    const videoPlaylistElement = await VideoPlaylistElementModel.loadByPlaylistAndElementIdForAP(playlistId, playlistElementId)
    if (!videoPlaylistElement) {
      res.fail({
        status: HttpStatusCode.NOT_FOUND_404,
        message: 'Video playlist element not found'
      })
      return
    }

    if (videoPlaylistElement.VideoPlaylist.privacy === VideoPlaylistPrivacy.PRIVATE) {
      return res.fail({
        status: HttpStatusCode.FORBIDDEN_403,
        message: 'Cannot get this private video playlist.'
      })
    }

    res.locals.videoPlaylistElementAP = videoPlaylistElement

    return next()
  }
]

const videoPlaylistsReorderVideosValidator = [
  isValidPlaylistIdParam('playlistId'),

  body('startPosition')
    .isInt({ min: 1 }),
  body('insertAfterPosition')
    .isInt({ min: 0 }),
  body('reorderLength')
    .optional()
    .isInt({ min: 1 }),

  async (req: express.Request, res: express.Response, next: express.NextFunction) => {
    if (areValidationErrors(req, res)) return

    if (!await doesVideoPlaylistExist(req.params.playlistId, res, 'all')) return

    const videoPlaylist = getPlaylist(res)
    if (!checkUserCanManageVideoPlaylist(res.locals.oauth.token.User, videoPlaylist, UserRight.UPDATE_ANY_VIDEO_PLAYLIST, res)) return

    const nextPosition = await VideoPlaylistElementModel.getNextPositionOf(videoPlaylist.id)
    const startPosition: number = req.body.startPosition
    const insertAfterPosition: number = req.body.insertAfterPosition
    const reorderLength: number = req.body.reorderLength

    if (startPosition >= nextPosition || insertAfterPosition >= nextPosition) {
      res.fail({ message: `Start position or insert after position exceed the playlist limits (max: ${nextPosition - 1})` })
      return
    }

    if (reorderLength && reorderLength + startPosition > nextPosition) {
      res.fail({ message: `Reorder length with this start position exceeds the playlist limits (max: ${nextPosition - startPosition})` })
      return
    }

    return next()
  }
]

const commonVideoPlaylistFiltersValidator = [
  query('playlistType')
    .optional()
    .custom(isVideoPlaylistTypeValid),

  (req: express.Request, res: express.Response, next: express.NextFunction) => {
    if (areValidationErrors(req, res)) return

    return next()
  }
]

const doVideosInPlaylistExistValidator = [
  query('videoIds')
    .customSanitizer(toIntArray)
    .custom(v => isArrayOf(v, isIdValid)).withMessage('Should have a valid video ids array'),

  (req: express.Request, res: express.Response, next: express.NextFunction) => {
    if (areValidationErrors(req, res)) return

    return next()
  }
]

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

export {
  videoPlaylistsAddValidator,
  videoPlaylistsUpdateValidator,
  videoPlaylistsDeleteValidator,
  videoPlaylistsGetValidator,
  videoPlaylistsSearchValidator,

  videoPlaylistsAddVideoValidator,
  videoPlaylistsUpdateOrRemoveVideoValidator,
  videoPlaylistsReorderVideosValidator,

  videoPlaylistElementAPGetValidator,

  commonVideoPlaylistFiltersValidator,

  doVideosInPlaylistExistValidator
}

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

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

    body('description')
      .optional()
      .customSanitizer(toValueOrNull)
      .custom(isVideoPlaylistDescriptionValid),
    body('privacy')
      .optional()
      .customSanitizer(toIntOrNull)
      .custom(isVideoPlaylistPrivacyValid),
    body('videoChannelId')
      .optional()
      .customSanitizer(toIntOrNull)
  ] as (ValidationChain | ExpressPromiseHandler)[]
}

function checkUserCanManageVideoPlaylist (user: MUserAccountId, videoPlaylist: MVideoPlaylist, right: UserRight, res: express.Response) {
  if (videoPlaylist.isOwned() === false) {
    res.fail({
      status: HttpStatusCode.FORBIDDEN_403,
      message: 'Cannot manage video playlist of another server.'
    })
    return false
  }

  // Check if the user can manage the video playlist
  // The user can delete it if s/he is an admin
  // Or if s/he is the video playlist's owner
  if (user.hasRight(right) === false && videoPlaylist.ownerAccountId !== user.Account.id) {
    res.fail({
      status: HttpStatusCode.FORBIDDEN_403,
      message: 'Cannot manage video playlist of another user'
    })
    return false
  }

  return true
}

function getPlaylist (res: express.Response) {
  return res.locals.videoPlaylistFull || res.locals.videoPlaylistSummary
}