const db = require('../../initializers/database')
import { checkErrors } from './utils'
import { CONSTRAINTS_FIELDS, SEARCHABLE_COLUMNS } from '../../initializers'
import { logger, isVideoDurationValid } from '../../helpers'

function videosAddValidator (req, res, next) {
  req.checkBody('videofile', 'Should have a valid file').isVideoFile(req.files)
  req.checkBody('name', 'Should have a valid name').isVideoNameValid()
  req.checkBody('category', 'Should have a valid category').isVideoCategoryValid()
  req.checkBody('licence', 'Should have a valid licence').isVideoLicenceValid()
  req.checkBody('language', 'Should have a valid language').optional().isVideoLanguageValid()
  req.checkBody('nsfw', 'Should have a valid NSFW attribute').isVideoNSFWValid()
  req.checkBody('description', 'Should have a valid description').isVideoDescriptionValid()
  req.checkBody('tags', 'Should have correct tags').optional().isVideoTagsValid()

  logger.debug('Checking videosAdd parameters', { parameters: req.body, files: req.files })

  checkErrors(req, res, function () {
    const videoFile = req.files.videofile[0]

    db.Video.getDurationFromFile(videoFile.path, function (err, duration) {
      if (err) {
        return res.status(400).send('Cannot retrieve metadata of the file.')
      }

      if (!isVideoDurationValid(duration)) {
        return res.status(400).send('Duration of the video file is too big (max: ' + CONSTRAINTS_FIELDS.VIDEOS.DURATION.max + 's).')
      }

      videoFile.duration = duration
      next()
    })
  })
}

function videosUpdateValidator (req, res, next) {
  req.checkParams('id', 'Should have a valid id').notEmpty().isUUID(4)
  req.checkBody('name', 'Should have a valid name').optional().isVideoNameValid()
  req.checkBody('category', 'Should have a valid category').optional().isVideoCategoryValid()
  req.checkBody('licence', 'Should have a valid licence').optional().isVideoLicenceValid()
  req.checkBody('language', 'Should have a valid language').optional().isVideoLanguageValid()
  req.checkBody('nsfw', 'Should have a valid NSFW attribute').optional().isVideoNSFWValid()
  req.checkBody('description', 'Should have a valid description').optional().isVideoDescriptionValid()
  req.checkBody('tags', 'Should have correct tags').optional().isVideoTagsValid()

  logger.debug('Checking videosUpdate parameters', { parameters: req.body })

  checkErrors(req, res, function () {
    checkVideoExists(req.params.id, res, function () {
      // We need to make additional checks
      if (res.locals.video.isOwned() === false) {
        return res.status(403).send('Cannot update video of another pod')
      }

      if (res.locals.video.Author.userId !== res.locals.oauth.token.User.id) {
        return res.status(403).send('Cannot update video of another user')
      }

      next()
    })
  })
}

function videosGetValidator (req, res, next) {
  req.checkParams('id', 'Should have a valid id').notEmpty().isUUID(4)

  logger.debug('Checking videosGet parameters', { parameters: req.params })

  checkErrors(req, res, function () {
    checkVideoExists(req.params.id, res, next)
  })
}

function videosRemoveValidator (req, res, next) {
  req.checkParams('id', 'Should have a valid id').notEmpty().isUUID(4)

  logger.debug('Checking videosRemove parameters', { parameters: req.params })

  checkErrors(req, res, function () {
    checkVideoExists(req.params.id, res, function () {
      // We need to make additional checks

      // Check if the user who did the request is able to delete the video
      checkUserCanDeleteVideo(res.locals.oauth.token.User.id, res, function () {
        next()
      })
    })
  })
}

function videosSearchValidator (req, res, next) {
  const searchableColumns = SEARCHABLE_COLUMNS.VIDEOS
  req.checkParams('value', 'Should have a valid search').notEmpty()
  req.checkQuery('field', 'Should have correct searchable column').optional().isIn(searchableColumns)

  logger.debug('Checking videosSearch parameters', { parameters: req.params })

  checkErrors(req, res, next)
}

function videoAbuseReportValidator (req, res, next) {
  req.checkParams('id', 'Should have a valid id').notEmpty().isUUID(4)
  req.checkBody('reason', 'Should have a valid reason').isVideoAbuseReasonValid()

  logger.debug('Checking videoAbuseReport parameters', { parameters: req.body })

  checkErrors(req, res, function () {
    checkVideoExists(req.params.id, res, next)
  })
}

function videoRateValidator (req, res, next) {
  req.checkParams('id', 'Should have a valid id').notEmpty().isUUID(4)
  req.checkBody('rating', 'Should have a valid rate type').isVideoRatingTypeValid()

  logger.debug('Checking videoRate parameters', { parameters: req.body })

  checkErrors(req, res, function () {
    checkVideoExists(req.params.id, res, next)
  })
}

function videosBlacklistValidator (req, res, next) {
  req.checkParams('id', 'Should have a valid id').notEmpty().isUUID(4)

  logger.debug('Checking videosBlacklist parameters', { parameters: req.params })

  checkErrors(req, res, function () {
    checkVideoExists(req.params.id, res, function () {
      checkVideoIsBlacklistable(req, res, next)
    })
  })
}

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

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

  videoAbuseReportValidator,

  videoRateValidator,

  videosBlacklistValidator
}

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

function checkVideoExists (id, res, callback) {
  db.Video.loadAndPopulateAuthorAndPodAndTags(id, function (err, video) {
    if (err) {
      logger.error('Error in video request validator.', { error: err })
      return res.sendStatus(500)
    }

    if (!video) return res.status(404).send('Video not found')

    res.locals.video = video
    callback()
  })
}

function checkUserCanDeleteVideo (userId, res, callback) {
  // Retrieve the user who did the request
  db.User.loadById(userId, function (err, user) {
    if (err) {
      logger.error('Error in video request validator.', { error: err })
      return res.sendStatus(500)
    }

    // Check if the user can delete the video
    // The user can delete it if s/he is an admin
    // Or if s/he is the video's author
    if (user.isAdmin() === false) {
      if (res.locals.video.isOwned() === false) {
        return res.status(403).send('Cannot remove video of another pod')
      }

      if (res.locals.video.Author.userId !== res.locals.oauth.token.User.id) {
        return res.status(403).send('Cannot remove video of another user')
      }
    }

    // If we reach this comment, we can delete the video
    callback()
  })
}

function checkVideoIsBlacklistable (req, res, callback) {
  if (res.locals.video.isOwned() === true) {
    return res.status(403).send('Cannot blacklist a local video')
  }

  callback()
}