import * as Bull from 'bull'
import { VideoResolution, VideoState } from '../../../../shared'
import { logger } from '../../../helpers/logger'
import { VideoModel } from '../../../models/video/video'
import { JobQueue } from '../job-queue'
import { federateVideoIfNeeded } from '../../activitypub'
import { retryTransactionWrapper } from '../../../helpers/database-utils'
import { sequelizeTypescript } from '../../../initializers'
import * as Bluebird from 'bluebird'
import { computeResolutionsToTranscode } from '../../../helpers/ffmpeg-utils'

export type VideoFilePayload = {
  videoUUID: string
  isNewVideo?: boolean
  resolution?: VideoResolution
  isPortraitMode?: boolean
}

export type VideoFileImportPayload = {
  videoUUID: string,
  filePath: string
}

async function processVideoFileImport (job: Bull.Job) {
  const payload = job.data as VideoFileImportPayload
  logger.info('Processing video file import in job %d.', job.id)

  const video = await VideoModel.loadByUUIDAndPopulateAccountAndServerAndTags(payload.videoUUID)
  // No video, maybe deleted?
  if (!video) {
    logger.info('Do not process job %d, video does not exist.', job.id)
    return undefined
  }

  await video.importVideoFile(payload.filePath)

  await onVideoFileTranscoderOrImportSuccess(video)
  return video
}

async function processVideoFile (job: Bull.Job) {
  const payload = job.data as VideoFilePayload
  logger.info('Processing video file in job %d.', job.id)

  const video = await VideoModel.loadByUUIDAndPopulateAccountAndServerAndTags(payload.videoUUID)
  // No video, maybe deleted?
  if (!video) {
    logger.info('Do not process job %d, video does not exist.', job.id)
    return undefined
  }

  // Transcoding in other resolution
  if (payload.resolution) {
    await video.transcodeOriginalVideofile(payload.resolution, payload.isPortraitMode || false)

    await retryTransactionWrapper(onVideoFileTranscoderOrImportSuccess, video)
  } else {
    await video.optimizeOriginalVideofile()

    await retryTransactionWrapper(onVideoFileOptimizerSuccess, video, payload.isNewVideo)
  }

  return video
}

async function onVideoFileTranscoderOrImportSuccess (video: VideoModel) {
  if (video === undefined) return undefined

  return sequelizeTypescript.transaction(async t => {
    // Maybe the video changed in database, refresh it
    let videoDatabase = await VideoModel.loadByUUIDAndPopulateAccountAndServerAndTags(video.uuid, t)
    // Video does not exist anymore
    if (!videoDatabase) return undefined

    let isNewVideo = false

    // We transcoded the video file in another format, now we can publish it
    if (videoDatabase.state !== VideoState.PUBLISHED) {
      isNewVideo = true

      videoDatabase.state = VideoState.PUBLISHED
      videoDatabase.publishedAt = new Date()
      videoDatabase = await videoDatabase.save({ transaction: t })
    }

    // If the video was not published, we consider it is a new one for other instances
    await federateVideoIfNeeded(videoDatabase, isNewVideo, t)

    return undefined
  })
}

async function onVideoFileOptimizerSuccess (video: VideoModel, isNewVideo: boolean) {
  if (video === undefined) return undefined

  // Outside the transaction (IO on disk)
  const { videoFileResolution } = await video.getOriginalFileResolution()

  return sequelizeTypescript.transaction(async t => {
    // Maybe the video changed in database, refresh it
    const videoDatabase = await VideoModel.loadByUUIDAndPopulateAccountAndServerAndTags(video.uuid, t)
    // Video does not exist anymore
    if (!videoDatabase) return undefined

    // Create transcoding jobs if there are enabled resolutions
    const resolutionsEnabled = computeResolutionsToTranscode(videoFileResolution)
    logger.info(
      'Resolutions computed for video %s and origin file height of %d.', videoDatabase.uuid, videoFileResolution,
      { resolutions: resolutionsEnabled }
    )

    if (resolutionsEnabled.length !== 0) {
      const tasks: Bluebird<any>[] = []

      for (const resolution of resolutionsEnabled) {
        const dataInput = {
          videoUUID: videoDatabase.uuid,
          resolution
        }

        const p = JobQueue.Instance.createJob({ type: 'video-file', payload: dataInput })
        tasks.push(p)
      }

      await Promise.all(tasks)

      logger.info('Transcoding jobs created for uuid %s.', videoDatabase.uuid, { resolutionsEnabled })
    } else {
      // No transcoding to do, it's now published
      video.state = VideoState.PUBLISHED
      video = await video.save({ transaction: t })

      logger.info('No transcoding jobs created for video %s (no resolutions).', video.uuid)
    }

    return federateVideoIfNeeded(video, isNewVideo, t)
  })
}

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

export {
  processVideoFile,
  processVideoFileImport
}