import { Job } from 'bullmq'
import { move, remove } from 'fs-extra/esm'
import { stat } from 'fs/promises'
import {
  ThumbnailType,
  ThumbnailType_Type,
  VideoImportPayload,
  VideoImportPreventExceptionResult,
  VideoImportState,
  VideoImportTorrentPayload,
  VideoImportTorrentPayloadType,
  VideoImportYoutubeDLPayload,
  VideoImportYoutubeDLPayloadType,
  VideoResolution,
  VideoState
} from '@peertube/peertube-models'
import { retryTransactionWrapper } from '@server/helpers/database-utils.js'
import { YoutubeDLWrapper } from '@server/helpers/youtube-dl/index.js'
import { CONFIG } from '@server/initializers/config.js'
import { isPostImportVideoAccepted } from '@server/lib/moderation.js'
import { generateWebVideoFilename } from '@server/lib/paths.js'
import { Hooks } from '@server/lib/plugins/hooks.js'
import { ServerConfigManager } from '@server/lib/server-config-manager.js'
import { createOptimizeOrMergeAudioJobs } from '@server/lib/transcoding/create-transcoding-job.js'
import { isUserQuotaValid } from '@server/lib/user.js'
import { VideoPathManager } from '@server/lib/video-path-manager.js'
import { buildNextVideoState } from '@server/lib/video-state.js'
import { buildMoveJob, buildStoryboardJobIfNeeded } from '@server/lib/video-jobs.js'
import { MUserId, MVideoFile, MVideoFullLight } from '@server/types/models/index.js'
import { MVideoImport, MVideoImportDefault, MVideoImportDefaultFiles, MVideoImportVideo } from '@server/types/models/video/video-import.js'
import { getLowercaseExtension } from '@peertube/peertube-node-utils'
import {
  ffprobePromise,
  getChaptersFromContainer,
  getVideoStreamDimensionsInfo,
  getVideoStreamDuration,
  getVideoStreamFPS,
  isAudioFile
} from '@peertube/peertube-ffmpeg'
import { logger } from '../../../helpers/logger.js'
import { getSecureTorrentName } from '../../../helpers/utils.js'
import { createTorrentAndSetInfoHash, downloadWebTorrentVideo } from '../../../helpers/webtorrent.js'
import { CONSTRAINTS_FIELDS, JOB_TTL } from '../../../initializers/constants.js'
import { sequelizeTypescript } from '../../../initializers/database.js'
import { VideoFileModel } from '../../../models/video/video-file.js'
import { VideoImportModel } from '../../../models/video/video-import.js'
import { VideoModel } from '../../../models/video/video.js'
import { federateVideoIfNeeded } from '../../activitypub/videos/index.js'
import { Notifier } from '../../notifier/index.js'
import { generateLocalVideoMiniature } from '../../thumbnail.js'
import { JobQueue } from '../job-queue.js'
import { replaceChaptersIfNotExist } from '@server/lib/video-chapters.js'
import { FfprobeData } from 'fluent-ffmpeg'

async function processVideoImport (job: Job): Promise<VideoImportPreventExceptionResult> {
  const payload = job.data as VideoImportPayload

  const videoImport = await getVideoImportOrDie(payload)
  if (videoImport.state === VideoImportState.CANCELLED) {
    logger.info('Do not process import since it has been cancelled', { payload })
    return { resultType: 'success' }
  }

  videoImport.state = VideoImportState.PROCESSING
  await videoImport.save()

  try {
    if (payload.type === 'youtube-dl') await processYoutubeDLImport(job, videoImport, payload)
    if (payload.type === 'magnet-uri' || payload.type === 'torrent-file') await processTorrentImport(job, videoImport, payload)

    return { resultType: 'success' }
  } catch (err) {
    if (!payload.preventException) throw err

    logger.warn('Catch error in video import to send value to parent job.', { payload, err })
    return { resultType: 'error' }
  }
}

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

export {
  processVideoImport
}

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

async function processTorrentImport (job: Job, videoImport: MVideoImportDefault, payload: VideoImportTorrentPayload) {
  logger.info('Processing torrent video import in job %s.', job.id)

  const options = { type: payload.type, videoImportId: payload.videoImportId }

  const target = {
    torrentName: videoImport.torrentName ? getSecureTorrentName(videoImport.torrentName) : undefined,
    uri: videoImport.magnetUri
  }
  return processFile(() => downloadWebTorrentVideo(target, JOB_TTL['video-import']), videoImport, options)
}

async function processYoutubeDLImport (job: Job, videoImport: MVideoImportDefault, payload: VideoImportYoutubeDLPayload) {
  logger.info('Processing youtubeDL video import in job %s.', job.id)

  const options = { type: payload.type, videoImportId: videoImport.id }

  const youtubeDL = new YoutubeDLWrapper(
    videoImport.targetUrl,
    ServerConfigManager.Instance.getEnabledResolutions('vod'),
    CONFIG.TRANSCODING.ALWAYS_TRANSCODE_ORIGINAL_RESOLUTION
  )

  return processFile(
    () => youtubeDL.downloadVideo(payload.fileExt, JOB_TTL['video-import']),
    videoImport,
    options
  )
}

async function getVideoImportOrDie (payload: VideoImportPayload) {
  const videoImport = await VideoImportModel.loadAndPopulateVideo(payload.videoImportId)
  if (!videoImport?.Video) {
    throw new Error(`Cannot import video ${payload.videoImportId}: the video import or video linked to this import does not exist anymore.`)
  }

  return videoImport
}

type ProcessFileOptions = {
  type: VideoImportYoutubeDLPayloadType | VideoImportTorrentPayloadType
  videoImportId: number
}
async function processFile (downloader: () => Promise<string>, videoImport: MVideoImportDefault, options: ProcessFileOptions) {
  let tempVideoPath: string
  let videoFile: VideoFileModel

  try {
    // Download video from youtubeDL
    tempVideoPath = await downloader()

    // Get information about this video
    const stats = await stat(tempVideoPath)
    const isAble = await isUserQuotaValid({ userId: videoImport.User.id, uploadSize: stats.size })
    if (isAble === false) {
      throw new Error('The user video quota is exceeded with this video to import.')
    }

    const ffprobe = await ffprobePromise(tempVideoPath)

    const { resolution } = await isAudioFile(tempVideoPath, ffprobe)
      ? { resolution: VideoResolution.H_NOVIDEO }
      : await getVideoStreamDimensionsInfo(tempVideoPath, ffprobe)

    const fps = await getVideoStreamFPS(tempVideoPath, ffprobe)
    const duration = await getVideoStreamDuration(tempVideoPath, ffprobe)

    const containerChapters = await getChaptersFromContainer({
      path: tempVideoPath,
      maxTitleLength: CONSTRAINTS_FIELDS.VIDEO_CHAPTERS.TITLE.max,
      ffprobe
    })

    // Prepare video file object for creation in database
    const fileExt = getLowercaseExtension(tempVideoPath)
    const videoFileData = {
      extname: fileExt,
      resolution,
      size: stats.size,
      filename: generateWebVideoFilename(resolution, fileExt),
      fps,
      videoId: videoImport.videoId
    }
    videoFile = new VideoFileModel(videoFileData)

    const hookName = options.type === 'youtube-dl'
      ? 'filter:api.video.post-import-url.accept.result'
      : 'filter:api.video.post-import-torrent.accept.result'

    // Check we accept this video
    const acceptParameters = {
      videoImport,
      video: videoImport.Video,
      videoFilePath: tempVideoPath,
      videoFile,
      user: videoImport.User
    }
    const acceptedResult = await Hooks.wrapFun(isPostImportVideoAccepted, acceptParameters, hookName)

    if (acceptedResult.accepted !== true) {
      logger.info('Refused imported video.', { acceptedResult, acceptParameters })

      videoImport.state = VideoImportState.REJECTED
      await videoImport.save()

      throw new Error(acceptedResult.errorMessage)
    }

    // Video is accepted, resuming preparation
    const videoFileLockReleaser = await VideoPathManager.Instance.lockFiles(videoImport.Video.uuid)

    try {
      const videoImportWithFiles = await refreshVideoImportFromDB(videoImport, videoFile)

      // Move file
      const videoDestFile = VideoPathManager.Instance.getFSVideoFileOutputPath(videoImportWithFiles.Video, videoFile)
      await move(tempVideoPath, videoDestFile)

      tempVideoPath = null // This path is not used anymore

      const thumbnails = await generateMiniature({ videoImportWithFiles, videoFile, ffprobe })

      // Create torrent
      await createTorrentAndSetInfoHash(videoImportWithFiles.Video, videoFile)

      const { videoImportUpdated, video } = await retryTransactionWrapper(() => {
        return sequelizeTypescript.transaction(async t => {
          // Refresh video
          const video = await VideoModel.load(videoImportWithFiles.videoId, t)
          if (!video) throw new Error('Video linked to import ' + videoImportWithFiles.videoId + ' does not exist anymore.')

          await videoFile.save({ transaction: t })

          // Update video DB object
          video.duration = duration
          video.state = buildNextVideoState(video.state)
          await video.save({ transaction: t })

          for (const thumbnail of thumbnails) {
            await video.addAndSaveThumbnail(thumbnail, t)
          }

          await replaceChaptersIfNotExist({ video, chapters: containerChapters, transaction: t })

          // Now we can federate the video (reload from database, we need more attributes)
          const videoForFederation = await VideoModel.loadFull(video.uuid, t)
          await federateVideoIfNeeded(videoForFederation, true, t)

          // Update video import object
          videoImportWithFiles.state = VideoImportState.SUCCESS
          const videoImportUpdated = await videoImportWithFiles.save({ transaction: t }) as MVideoImport

          logger.info('Video %s imported.', video.uuid)

          return { videoImportUpdated, video: videoForFederation }
        })
      })

      await afterImportSuccess({ videoImport: videoImportUpdated, video, videoFile, user: videoImport.User, videoFileAlreadyLocked: true })
    } finally {
      videoFileLockReleaser()
    }
  } catch (err) {
    await onImportError(err, tempVideoPath, videoImport)

    throw err
  }
}

async function refreshVideoImportFromDB (videoImport: MVideoImportDefault, videoFile: MVideoFile): Promise<MVideoImportDefaultFiles> {
  // Refresh video, privacy may have changed
  const video = await videoImport.Video.reload()
  const videoWithFiles = Object.assign(video, { VideoFiles: [ videoFile ], VideoStreamingPlaylists: [] })

  return Object.assign(videoImport, { Video: videoWithFiles })
}

async function generateMiniature (options: {
  videoImportWithFiles: MVideoImportDefaultFiles
  videoFile: MVideoFile
  ffprobe: FfprobeData
}) {
  const { ffprobe, videoFile, videoImportWithFiles } = options

  const thumbnailsToGenerate: ThumbnailType_Type[] = []

  if (!videoImportWithFiles.Video.getMiniature()) {
    thumbnailsToGenerate.push(ThumbnailType.MINIATURE)
  }

  if (!videoImportWithFiles.Video.getPreview()) {
    thumbnailsToGenerate.push(ThumbnailType.PREVIEW)
  }

  return generateLocalVideoMiniature({
    video: videoImportWithFiles.Video,
    videoFile,
    types: thumbnailsToGenerate,
    ffprobe
  })
}

async function afterImportSuccess (options: {
  videoImport: MVideoImport
  video: MVideoFullLight
  videoFile: MVideoFile
  user: MUserId
  videoFileAlreadyLocked: boolean
}) {
  const { video, videoFile, videoImport, user, videoFileAlreadyLocked } = options

  Notifier.Instance.notifyOnFinishedVideoImport({ videoImport: Object.assign(videoImport, { Video: video }), success: true })

  if (video.isBlacklisted()) {
    const videoBlacklist = Object.assign(video.VideoBlacklist, { Video: video })

    Notifier.Instance.notifyOnVideoAutoBlacklist(videoBlacklist)
  } else {
    Notifier.Instance.notifyOnNewVideoOrLiveIfNeeded(video)
  }

  // Generate the storyboard in the job queue, and don't forget to federate an update after
  await JobQueue.Instance.createJob(buildStoryboardJobIfNeeded({ video, federate: true }))

  if (video.state === VideoState.TO_MOVE_TO_EXTERNAL_STORAGE) {
    await JobQueue.Instance.createJob(
      await buildMoveJob({ video, previousVideoState: VideoState.TO_IMPORT, type: 'move-to-object-storage' })
    )
    return
  }

  if (video.state === VideoState.TO_TRANSCODE) { // Create transcoding jobs?
    await createOptimizeOrMergeAudioJobs({ video, videoFile, isNewVideo: true, user, videoFileAlreadyLocked })
  }
}

async function onImportError (err: Error, tempVideoPath: string, videoImport: MVideoImportVideo) {
  try {
    if (tempVideoPath) await remove(tempVideoPath)
  } catch (errUnlink) {
    logger.warn('Cannot cleanup files after a video import error.', { err: errUnlink })
  }

  videoImport.error = err.message
  if (videoImport.state !== VideoImportState.REJECTED) {
    videoImport.state = VideoImportState.FAILED
  }
  await videoImport.save()

  Notifier.Instance.notifyOnFinishedVideoImport({ videoImport, success: false })
}