import * as Bluebird from 'bluebird'
import { ActivityUpdate } from '../../../../shared/models/activitypub'
import { retryTransactionWrapper } from '../../../helpers/database-utils'
import { logger } from '../../../helpers/logger'
import { resetSequelizeInstance } from '../../../helpers/utils'
import { sequelizeTypescript } from '../../../initializers'
import { ActorModel } from '../../../models/activitypub/actor'
import { TagModel } from '../../../models/video/tag'
import { VideoModel } from '../../../models/video/video'
import { VideoFileModel } from '../../../models/video/video-file'
import { getOrCreateActorAndServerAndModel } from '../actor'
import { videoActivityObjectToDBAttributes, videoFileActivityUrlToDBAttributes } from './misc'

async function processUpdateActivity (activity: ActivityUpdate) {
  const actor = await getOrCreateActorAndServerAndModel(activity.actor)

  if (activity.object.type === 'Video') {
    return processUpdateVideo(actor, activity)
  }

  return
}

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

export {
  processUpdateActivity
}

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

function processUpdateVideo (actor: ActorModel, activity: ActivityUpdate) {
  const options = {
    arguments: [ actor, activity ],
    errorMessage: 'Cannot update the remote video with many retries'
  }

  return retryTransactionWrapper(updateRemoteVideo, options)
}

async function updateRemoteVideo (actor: ActorModel, activity: ActivityUpdate) {
  const videoAttributesToUpdate = activity.object

  logger.debug('Updating remote video "%s".', videoAttributesToUpdate.uuid)
  let videoInstance: VideoModel
  let videoFieldsSave: object

  try {
    await sequelizeTypescript.transaction(async t => {
      const sequelizeOptions = {
        transaction: t
      }

      const videoInstance = await VideoModel.loadByUrlAndPopulateAccount(videoAttributesToUpdate.id, t)
      if (!videoInstance) throw new Error('Video ' + videoAttributesToUpdate.id + ' not found.')

      const videoChannel = videoInstance.VideoChannel
      if (videoChannel.Account.Actor.id !== actor.id) {
        throw new Error('Account ' + actor.url + ' does not own video channel ' + videoChannel.Actor.url)
      }

      const videoData = await videoActivityObjectToDBAttributes(videoChannel, videoAttributesToUpdate, activity.to, activity.cc)
      videoInstance.set('name', videoData.name)
      videoInstance.set('category', videoData.category)
      videoInstance.set('licence', videoData.licence)
      videoInstance.set('language', videoData.language)
      videoInstance.set('nsfw', videoData.nsfw)
      videoInstance.set('commentsEnabled', videoData.commentsEnabled)
      videoInstance.set('privacy', videoData.privacy)
      videoInstance.set('description', videoData.description)
      videoInstance.set('duration', videoData.duration)
      videoInstance.set('createdAt', videoData.createdAt)
      videoInstance.set('updatedAt', videoData.updatedAt)
      videoInstance.set('views', videoData.views)

      await videoInstance.save(sequelizeOptions)

      // Remove old video files
      const videoFileDestroyTasks: Bluebird<void>[] = []
      for (const videoFile of videoInstance.VideoFiles) {
        videoFileDestroyTasks.push(videoFile.destroy(sequelizeOptions))
      }
      await Promise.all(videoFileDestroyTasks)

      const videoFileAttributes = videoFileActivityUrlToDBAttributes(videoInstance, videoAttributesToUpdate)
      const tasks: Bluebird<any>[] = videoFileAttributes.map(f => VideoFileModel.create(f))
      await Promise.all(tasks)

      const tags = videoAttributesToUpdate.tag.map(t => t.name)
      const tagInstances = await TagModel.findOrCreateTags(tags, t)
      await videoInstance.$set('Tags', tagInstances, sequelizeOptions)
    })

    logger.info('Remote video with uuid %s updated', videoAttributesToUpdate.uuid)
  } catch (err) {
    if (videoInstance !== undefined && videoFieldsSave !== undefined) {
      resetSequelizeInstance(videoInstance, videoFieldsSave)
    }

    // This is just a debug because we will retry the insert
    logger.debug('Cannot update the remote video.', err)
    throw err
  }
}