import express from 'express'
import { body, param, query } from 'express-validator'
import { MUserAccountUrl } from '@server/types/models'
import { HttpStatusCode, UserRight } from '@shared/models'
import { exists, isBooleanValid, isIdValid, toBooleanOrNull } from '../../../helpers/custom-validators/misc'
import { isValidVideoCommentText } from '../../../helpers/custom-validators/video-comments'
import { logger } from '../../../helpers/logger'
import { AcceptResult, isLocalVideoCommentReplyAccepted, isLocalVideoThreadAccepted } from '../../../lib/moderation'
import { Hooks } from '../../../lib/plugins/hooks'
import { MCommentOwnerVideoReply, MVideo, MVideoFullLight } from '../../../types/models/video'
import {
  areValidationErrors,
  checkCanSeeVideoIfPrivate,
  doesVideoCommentExist,
  doesVideoCommentThreadExist,
  doesVideoExist,
  isValidVideoIdParam
} from '../shared'

const listVideoCommentsValidator = [
  query('isLocal')
  .optional()
  .customSanitizer(toBooleanOrNull)
  .custom(isBooleanValid)
  .withMessage('Should have a valid is local boolean'),

  query('search')
    .optional()
    .custom(exists).withMessage('Should have a valid search'),

  query('searchAccount')
    .optional()
    .custom(exists).withMessage('Should have a valid account search'),

  query('searchVideo')
    .optional()
    .custom(exists).withMessage('Should have a valid video search'),

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

    if (areValidationErrors(req, res)) return

    return next()
  }
]

const listVideoCommentThreadsValidator = [
  isValidVideoIdParam('videoId'),

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

    if (areValidationErrors(req, res)) return
    if (!await doesVideoExist(req.params.videoId, res, 'only-video')) return

    if (!await checkCanSeeVideoIfPrivate(req, res, res.locals.onlyVideo)) return

    return next()
  }
]

const listVideoThreadCommentsValidator = [
  isValidVideoIdParam('videoId'),

  param('threadId')
    .custom(isIdValid).not().isEmpty().withMessage('Should have a valid threadId'),

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

    if (areValidationErrors(req, res)) return
    if (!await doesVideoExist(req.params.videoId, res, 'only-video')) return
    if (!await doesVideoCommentThreadExist(req.params.threadId, res.locals.onlyVideo, res)) return

    if (!await checkCanSeeVideoIfPrivate(req, res, res.locals.onlyVideo)) return

    return next()
  }
]

const addVideoCommentThreadValidator = [
  isValidVideoIdParam('videoId'),

  body('text')
    .custom(isValidVideoCommentText).not().isEmpty().withMessage('Should have a valid comment text'),

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

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

    if (!await checkCanSeeVideoIfPrivate(req, res, res.locals.videoAll)) return

    if (!isVideoCommentsEnabled(res.locals.videoAll, res)) return
    if (!await isVideoCommentAccepted(req, res, res.locals.videoAll, false)) return

    return next()
  }
]

const addVideoCommentReplyValidator = [
  isValidVideoIdParam('videoId'),

  param('commentId').custom(isIdValid).not().isEmpty().withMessage('Should have a valid commentId'),

  body('text').custom(isValidVideoCommentText).not().isEmpty().withMessage('Should have a valid comment text'),

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

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

    if (!await checkCanSeeVideoIfPrivate(req, res, res.locals.videoAll)) return

    if (!isVideoCommentsEnabled(res.locals.videoAll, res)) return
    if (!await doesVideoCommentExist(req.params.commentId, res.locals.videoAll, res)) return
    if (!await isVideoCommentAccepted(req, res, res.locals.videoAll, true)) return

    return next()
  }
]

const videoCommentGetValidator = [
  isValidVideoIdParam('videoId'),

  param('commentId')
    .custom(isIdValid).not().isEmpty().withMessage('Should have a valid commentId'),

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

    if (areValidationErrors(req, res)) return
    if (!await doesVideoExist(req.params.videoId, res, 'id')) return
    if (!await doesVideoCommentExist(req.params.commentId, res.locals.videoId, res)) return

    return next()
  }
]

const removeVideoCommentValidator = [
  isValidVideoIdParam('videoId'),

  param('commentId').custom(isIdValid).not().isEmpty().withMessage('Should have a valid commentId'),

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

    if (areValidationErrors(req, res)) return
    if (!await doesVideoExist(req.params.videoId, res)) return
    if (!await doesVideoCommentExist(req.params.commentId, res.locals.videoAll, res)) return

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

    return next()
  }
]

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

export {
  listVideoCommentThreadsValidator,
  listVideoThreadCommentsValidator,
  addVideoCommentThreadValidator,
  listVideoCommentsValidator,
  addVideoCommentReplyValidator,
  videoCommentGetValidator,
  removeVideoCommentValidator
}

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

function isVideoCommentsEnabled (video: MVideo, res: express.Response) {
  if (video.commentsEnabled !== true) {
    res.fail({
      status: HttpStatusCode.CONFLICT_409,
      message: 'Video comments are disabled for this video.'
    })
    return false
  }

  return true
}

function checkUserCanDeleteVideoComment (user: MUserAccountUrl, videoComment: MCommentOwnerVideoReply, res: express.Response) {
  if (videoComment.isDeleted()) {
    res.fail({
      status: HttpStatusCode.CONFLICT_409,
      message: 'This comment is already deleted'
    })
    return false
  }

  const userAccount = user.Account

  if (
    user.hasRight(UserRight.REMOVE_ANY_VIDEO_COMMENT) === false && // Not a moderator
    videoComment.accountId !== userAccount.id && // Not the comment owner
    videoComment.Video.VideoChannel.accountId !== userAccount.id // Not the video owner
  ) {
    res.fail({
      status: HttpStatusCode.FORBIDDEN_403,
      message: 'Cannot remove video comment of another user'
    })
    return false
  }

  return true
}

async function isVideoCommentAccepted (req: express.Request, res: express.Response, video: MVideoFullLight, isReply: boolean) {
  const acceptParameters = {
    video,
    commentBody: req.body,
    user: res.locals.oauth.token.User
  }

  let acceptedResult: AcceptResult

  if (isReply) {
    const acceptReplyParameters = Object.assign(acceptParameters, { parentComment: res.locals.videoCommentFull })

    acceptedResult = await Hooks.wrapFun(
      isLocalVideoCommentReplyAccepted,
      acceptReplyParameters,
      'filter:api.video-comment-reply.create.accept.result'
    )
  } else {
    acceptedResult = await Hooks.wrapFun(
      isLocalVideoThreadAccepted,
      acceptParameters,
      'filter:api.video-thread.create.accept.result'
    )
  }

  if (!acceptedResult || acceptedResult.accepted !== true) {
    logger.info('Refused local comment.', { acceptedResult, acceptParameters })

    res.fail({
      status: HttpStatusCode.FORBIDDEN_403,
      message: acceptedResult?.errorMessage || 'Refused local comment'
    })
    return false
  }

  return true
}