import * as Bluebird from 'bluebird'
import * as sequelize from 'sequelize'
import * as magnetUtil from 'magnet-uri'
import { join } from 'path'
import * as request from 'request'
import { ActivityIconObject, ActivityVideoUrlObject, VideoState, ActivityUrlObject } from '../../../shared/index'
import { VideoTorrentObject } from '../../../shared/models/activitypub/objects'
import { VideoPrivacy } from '../../../shared/models/videos'
import { sanitizeAndCheckVideoTorrentObject } from '../../helpers/custom-validators/activitypub/videos'
import { isVideoFileInfoHashValid } from '../../helpers/custom-validators/videos'
import { resetSequelizeInstance, retryTransactionWrapper } from '../../helpers/database-utils'
import { logger } from '../../helpers/logger'
import { doRequest, doRequestAndSaveToFile } from '../../helpers/requests'
import { ACTIVITY_PUB, CONFIG, REMOTE_SCHEME, sequelizeTypescript, VIDEO_MIMETYPE_EXT } from '../../initializers'
import { ActorModel } from '../../models/activitypub/actor'
import { TagModel } from '../../models/video/tag'
import { VideoModel } from '../../models/video/video'
import { VideoChannelModel } from '../../models/video/video-channel'
import { VideoFileModel } from '../../models/video/video-file'
import { getOrCreateActorAndServerAndModel } from './actor'
import { addVideoComments } from './video-comments'
import { crawlCollectionPage } from './crawl'
import { sendCreateVideo, sendUpdateVideo } from './send'
import { isArray } from '../../helpers/custom-validators/misc'
import { VideoCaptionModel } from '../../models/video/video-caption'
import { JobQueue } from '../job-queue'
import { ActivitypubHttpFetcherPayload } from '../job-queue/handlers/activitypub-http-fetcher'
import { createRates } from './video-rates'
import { addVideoShares, shareVideoByServerAndChannel } from './share'
import { AccountModel } from '../../models/account/account'

async function federateVideoIfNeeded (video: VideoModel, isNewVideo: boolean, transaction?: sequelize.Transaction) {
  // If the video is not private and published, we federate it
  if (video.privacy !== VideoPrivacy.PRIVATE && video.state === VideoState.PUBLISHED) {
    // Fetch more attributes that we will need to serialize in AP object
    if (isArray(video.VideoCaptions) === false) {
      video.VideoCaptions = await video.$get('VideoCaptions', {
        attributes: [ 'language' ],
        transaction
      }) as VideoCaptionModel[]
    }

    if (isNewVideo) {
      // Now we'll add the video's meta data to our followers
      await sendCreateVideo(video, transaction)
      await shareVideoByServerAndChannel(video, transaction)
    } else {
      await sendUpdateVideo(video, transaction)
    }
  }
}

function fetchRemoteVideoStaticFile (video: VideoModel, path: string, reject: Function) {
  const host = video.VideoChannel.Account.Actor.Server.host

  // We need to provide a callback, if no we could have an uncaught exception
  return request.get(REMOTE_SCHEME.HTTP + '://' + host + path, err => {
    if (err) reject(err)
  })
}

async function fetchRemoteVideoDescription (video: VideoModel) {
  const host = video.VideoChannel.Account.Actor.Server.host
  const path = video.getDescriptionAPIPath()
  const options = {
    uri: REMOTE_SCHEME.HTTP + '://' + host + path,
    json: true
  }

  const { body } = await doRequest(options)
  return body.description ? body.description : ''
}

function generateThumbnailFromUrl (video: VideoModel, icon: ActivityIconObject) {
  const thumbnailName = video.getThumbnailName()
  const thumbnailPath = join(CONFIG.STORAGE.THUMBNAILS_DIR, thumbnailName)

  const options = {
    method: 'GET',
    uri: icon.url
  }
  return doRequestAndSaveToFile(options, thumbnailPath)
}

async function videoActivityObjectToDBAttributes (
  videoChannel: VideoChannelModel,
  videoObject: VideoTorrentObject,
  to: string[] = []
) {
  const privacy = to.indexOf(ACTIVITY_PUB.PUBLIC) !== -1 ? VideoPrivacy.PUBLIC : VideoPrivacy.UNLISTED
  const duration = videoObject.duration.replace(/[^\d]+/, '')

  let language: string | undefined
  if (videoObject.language) {
    language = videoObject.language.identifier
  }

  let category: number | undefined
  if (videoObject.category) {
    category = parseInt(videoObject.category.identifier, 10)
  }

  let licence: number | undefined
  if (videoObject.licence) {
    licence = parseInt(videoObject.licence.identifier, 10)
  }

  const description = videoObject.content || null
  const support = videoObject.support || null

  return {
    name: videoObject.name,
    uuid: videoObject.uuid,
    url: videoObject.id,
    category,
    licence,
    language,
    description,
    support,
    nsfw: videoObject.sensitive,
    commentsEnabled: videoObject.commentsEnabled,
    waitTranscoding: videoObject.waitTranscoding,
    state: videoObject.state,
    channelId: videoChannel.id,
    duration: parseInt(duration, 10),
    createdAt: new Date(videoObject.published),
    publishedAt: new Date(videoObject.published),
    // FIXME: updatedAt does not seems to be considered by Sequelize
    updatedAt: new Date(videoObject.updated),
    views: videoObject.views,
    likes: 0,
    dislikes: 0,
    remote: true,
    privacy
  }
}

function videoFileActivityUrlToDBAttributes (videoCreated: VideoModel, videoObject: VideoTorrentObject) {
  const fileUrls = videoObject.url.filter(u => isActivityVideoUrlObject(u)) as ActivityVideoUrlObject[]

  if (fileUrls.length === 0) {
    throw new Error('Cannot find video files for ' + videoCreated.url)
  }

  const attributes: VideoFileModel[] = []
  for (const fileUrl of fileUrls) {
    // Fetch associated magnet uri
    const magnet = videoObject.url.find(u => {
      return u.mimeType === 'application/x-bittorrent;x-scheme-handler/magnet' && u.height === fileUrl.height
    })

    if (!magnet) throw new Error('Cannot find associated magnet uri for file ' + fileUrl.href)

    const parsed = magnetUtil.decode(magnet.href)
    if (!parsed || isVideoFileInfoHashValid(parsed.infoHash) === false) {
      throw new Error('Cannot parse magnet URI ' + magnet.href)
    }

    const attribute = {
      extname: VIDEO_MIMETYPE_EXT[ fileUrl.mimeType ],
      infoHash: parsed.infoHash,
      resolution: fileUrl.height,
      size: fileUrl.size,
      videoId: videoCreated.id,
      fps: fileUrl.fps
    } as VideoFileModel
    attributes.push(attribute)
  }

  return attributes
}

function getOrCreateVideoChannelFromVideoObject (videoObject: VideoTorrentObject) {
  const channel = videoObject.attributedTo.find(a => a.type === 'Group')
  if (!channel) throw new Error('Cannot find associated video channel to video ' + videoObject.url)

  return getOrCreateActorAndServerAndModel(channel.id)
}

async function createVideo (videoObject: VideoTorrentObject, channelActor: ActorModel, waitThumbnail = false) {
  logger.debug('Adding remote video %s.', videoObject.id)

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

    const videoData = await videoActivityObjectToDBAttributes(channelActor.VideoChannel, videoObject, videoObject.to)
    const video = VideoModel.build(videoData)

    const videoCreated = await video.save(sequelizeOptions)

    // Process files
    const videoFileAttributes = videoFileActivityUrlToDBAttributes(videoCreated, videoObject)
    if (videoFileAttributes.length === 0) {
      throw new Error('Cannot find valid files for video %s ' + videoObject.url)
    }

    const videoFilePromises = videoFileAttributes.map(f => VideoFileModel.create(f, { transaction: t }))
    await Promise.all(videoFilePromises)

    // Process tags
    const tags = videoObject.tag.map(t => t.name)
    const tagInstances = await TagModel.findOrCreateTags(tags, t)
    await videoCreated.$set('Tags', tagInstances, sequelizeOptions)

    // Process captions
    const videoCaptionsPromises = videoObject.subtitleLanguage.map(c => {
      return VideoCaptionModel.insertOrReplaceLanguage(videoCreated.id, c.identifier, t)
    })
    await Promise.all(videoCaptionsPromises)

    logger.info('Remote video with uuid %s inserted.', videoObject.uuid)

    videoCreated.VideoChannel = channelActor.VideoChannel
    return videoCreated
  })

  const p = generateThumbnailFromUrl(videoCreated, videoObject.icon)
    .catch(err => logger.warn('Cannot generate thumbnail of %s.', videoObject.id, { err }))

  if (waitThumbnail === true) await p

  return videoCreated
}

type SyncParam = {
  likes: boolean
  dislikes: boolean
  shares: boolean
  comments: boolean
  thumbnail: boolean
  refreshVideo: boolean
}
async function getOrCreateVideoAndAccountAndChannel (
  videoObject: VideoTorrentObject | string,
  syncParam: SyncParam = { likes: true, dislikes: true, shares: true, comments: true, thumbnail: true, refreshVideo: false }
) {
  const videoUrl = typeof videoObject === 'string' ? videoObject : videoObject.id

  let videoFromDatabase = await VideoModel.loadByUrlAndPopulateAccount(videoUrl)
  if (videoFromDatabase) {
    const p = retryTransactionWrapper(refreshVideoIfNeeded, videoFromDatabase)
    if (syncParam.refreshVideo === true) videoFromDatabase = await p

    return { video: videoFromDatabase }
  }

  const { videoObject: fetchedVideo } = await fetchRemoteVideo(videoUrl)
  if (!fetchedVideo) throw new Error('Cannot fetch remote video with url: ' + videoUrl)

  const channelActor = await getOrCreateVideoChannelFromVideoObject(fetchedVideo)
  const video = await retryTransactionWrapper(createVideo, fetchedVideo, channelActor, syncParam.thumbnail)

  // Process outside the transaction because we could fetch remote data

  logger.info('Adding likes/dislikes/shares/comments of video %s.', video.uuid)

  const jobPayloads: ActivitypubHttpFetcherPayload[] = []

  if (syncParam.likes === true) {
    await crawlCollectionPage<string>(fetchedVideo.likes, items => createRates(items, video, 'like'))
      .catch(err => logger.error('Cannot add likes of video %s.', video.uuid, { err }))
  } else {
    jobPayloads.push({ uri: fetchedVideo.likes, videoId: video.id, type: 'video-likes' as 'video-likes' })
  }

  if (syncParam.dislikes === true) {
    await crawlCollectionPage<string>(fetchedVideo.dislikes, items => createRates(items, video, 'dislike'))
      .catch(err => logger.error('Cannot add dislikes of video %s.', video.uuid, { err }))
  } else {
    jobPayloads.push({ uri: fetchedVideo.dislikes, videoId: video.id, type: 'video-dislikes' as 'video-dislikes' })
  }

  if (syncParam.shares === true) {
    await crawlCollectionPage<string>(fetchedVideo.shares, items => addVideoShares(items, video))
      .catch(err => logger.error('Cannot add shares of video %s.', video.uuid, { err }))
  } else {
    jobPayloads.push({ uri: fetchedVideo.shares, videoId: video.id, type: 'video-shares' as 'video-shares' })
  }

  if (syncParam.comments === true) {
    await crawlCollectionPage<string>(fetchedVideo.comments, items => addVideoComments(items, video))
      .catch(err => logger.error('Cannot add comments of video %s.', video.uuid, { err }))
  } else {
    jobPayloads.push({ uri: fetchedVideo.shares, videoId: video.id, type: 'video-shares' as 'video-shares' })
  }

  await Bluebird.map(jobPayloads, payload => JobQueue.Instance.createJob({ type: 'activitypub-http-fetcher', payload }))

  return { video }
}

async function fetchRemoteVideo (videoUrl: string): Promise<{ response: request.RequestResponse, videoObject: VideoTorrentObject }> {
  const options = {
    uri: videoUrl,
    method: 'GET',
    json: true,
    activityPub: true
  }

  logger.info('Fetching remote video %s.', videoUrl)

  const { response, body } = await doRequest(options)

  if (sanitizeAndCheckVideoTorrentObject(body) === false) {
    logger.debug('Remote video JSON is not valid.', { body })
    return { response, videoObject: undefined }
  }

  return { response, videoObject: body }
}

async function refreshVideoIfNeeded (video: VideoModel): Promise<VideoModel> {
  if (!video.isOutdated()) return video

  try {
    const { response, videoObject } = await fetchRemoteVideo(video.url)
    if (response.statusCode === 404) {
      // Video does not exist anymore
      await video.destroy()
      return undefined
    }

    if (videoObject === undefined) {
      logger.warn('Cannot refresh remote video: invalid body.')
      return video
    }

    const channelActor = await getOrCreateVideoChannelFromVideoObject(videoObject)
    const account = await AccountModel.load(channelActor.VideoChannel.accountId)

    return updateVideoFromAP(video, videoObject, account, channelActor.VideoChannel)
  } catch (err) {
    logger.warn('Cannot refresh video.', { err })
    return video
  }
}

async function updateVideoFromAP (
  video: VideoModel,
  videoObject: VideoTorrentObject,
  account: AccountModel,
  channel: VideoChannelModel,
  overrideTo?: string[]
) {
  logger.debug('Updating remote video "%s".', videoObject.uuid)
  let videoFieldsSave: any

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

      videoFieldsSave = video.toJSON()

      // Check actor has the right to update the video
      const videoChannel = video.VideoChannel
      if (videoChannel.Account.id !== account.id) {
        throw new Error('Account ' + account.Actor.url + ' does not own video channel ' + videoChannel.Actor.url)
      }

      const to = overrideTo ? overrideTo : videoObject.to
      const videoData = await videoActivityObjectToDBAttributes(channel, videoObject, to)
      video.set('name', videoData.name)
      video.set('uuid', videoData.uuid)
      video.set('url', videoData.url)
      video.set('category', videoData.category)
      video.set('licence', videoData.licence)
      video.set('language', videoData.language)
      video.set('description', videoData.description)
      video.set('support', videoData.support)
      video.set('nsfw', videoData.nsfw)
      video.set('commentsEnabled', videoData.commentsEnabled)
      video.set('waitTranscoding', videoData.waitTranscoding)
      video.set('state', videoData.state)
      video.set('duration', videoData.duration)
      video.set('createdAt', videoData.createdAt)
      video.set('publishedAt', videoData.publishedAt)
      video.set('views', videoData.views)
      video.set('privacy', videoData.privacy)
      video.set('channelId', videoData.channelId)

      await video.save(sequelizeOptions)

      // Don't block on request
      generateThumbnailFromUrl(video, videoObject.icon)
        .catch(err => logger.warn('Cannot generate thumbnail of %s.', videoObject.id, { err }))

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

      const videoFileAttributes = videoFileActivityUrlToDBAttributes(video, videoObject)
      const tasks = videoFileAttributes.map(f => VideoFileModel.create(f, sequelizeOptions))
      await Promise.all(tasks)

      // Update Tags
      const tags = videoObject.tag.map(tag => tag.name)
      const tagInstances = await TagModel.findOrCreateTags(tags, t)
      await video.$set('Tags', tagInstances, sequelizeOptions)

      // Update captions
      await VideoCaptionModel.deleteAllCaptionsOfRemoteVideo(video.id, t)

      const videoCaptionsPromises = videoObject.subtitleLanguage.map(c => {
        return VideoCaptionModel.insertOrReplaceLanguage(video.id, c.identifier, t)
      })
      await Promise.all(videoCaptionsPromises)
    })

    logger.info('Remote video with uuid %s updated', videoObject.uuid)

    return updatedVideo
  } catch (err) {
    if (video !== undefined && videoFieldsSave !== undefined) {
      resetSequelizeInstance(video, videoFieldsSave)
    }

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

export {
  updateVideoFromAP,
  federateVideoIfNeeded,
  fetchRemoteVideo,
  getOrCreateVideoAndAccountAndChannel,
  fetchRemoteVideoStaticFile,
  fetchRemoteVideoDescription,
  generateThumbnailFromUrl,
  videoActivityObjectToDBAttributes,
  videoFileActivityUrlToDBAttributes,
  createVideo,
  getOrCreateVideoChannelFromVideoObject,
  addVideoShares,
  createRates
}

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

function isActivityVideoUrlObject (url: ActivityUrlObject): url is ActivityVideoUrlObject {
  const mimeTypes = Object.keys(VIDEO_MIMETYPE_EXT)

  return mimeTypes.indexOf(url.mimeType) !== -1 && url.mimeType.startsWith('video/')
}