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('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
  }
}