import { VideoFilter, VideoPrivacy, VideoState } from '@shared/models'
import { buildDirectionAndField, createSafeIn } from '@server/models/utils'
import { Model } from 'sequelize-typescript'
import { MUserAccountId, MUserId } from '@server/types/models'
import validator from 'validator'
import { exists } from '@server/helpers/custom-validators/misc'

export type BuildVideosQueryOptions = {
  attributes?: string[]

  serverAccountId: number
  followerActorId: number
  includeLocalVideos: boolean

  count: number
  start: number
  sort: string

  filter?: VideoFilter
  categoryOneOf?: number[]
  nsfw?: boolean
  licenceOneOf?: number[]
  languageOneOf?: string[]
  tagsOneOf?: string[]
  tagsAllOf?: string[]

  withFiles?: boolean

  accountId?: number
  videoChannelId?: number

  videoPlaylistId?: number

  trendingDays?: number
  user?: MUserAccountId
  historyOfUser?: MUserId

  startDate?: string // ISO 8601
  endDate?: string // ISO 8601
  originallyPublishedStartDate?: string
  originallyPublishedEndDate?: string

  durationMin?: number // seconds
  durationMax?: number // seconds

  search?: string

  isCount?: boolean

  group?: string
  having?: string
}

function buildListQuery (model: typeof Model, options: BuildVideosQueryOptions) {
  const and: string[] = []
  const joins: string[] = []
  const replacements: any = {}
  const cte: string[] = []

  let attributes: string[] = options.attributes || [ '"video"."id"' ]
  let group = options.group || ''
  const having = options.having || ''

  joins.push(
    'INNER JOIN "videoChannel" ON "videoChannel"."id" = "video"."channelId"' +
    'INNER JOIN "account" ON "account"."id" = "videoChannel"."accountId"' +
    'INNER JOIN "actor" "accountActor" ON "account"."actorId" = "accountActor"."id"'
  )

  and.push('"video"."id" NOT IN (SELECT "videoBlacklist"."videoId" FROM "videoBlacklist")')

  if (options.serverAccountId) {
    const blockerIds = [ options.serverAccountId ]
    if (options.user) blockerIds.push(options.user.Account.id)

    const inClause = createSafeIn(model, blockerIds)

    and.push(
      'NOT EXISTS (' +
      '  SELECT 1 FROM "accountBlocklist" ' +
      '  WHERE "accountBlocklist"."accountId" IN (' + inClause + ') ' +
      '  AND "accountBlocklist"."targetAccountId" = "account"."id" ' +
      ')' +
      'AND NOT EXISTS (' +
      '  SELECT 1 FROM "serverBlocklist" WHERE "serverBlocklist"."accountId" IN (' + inClause + ') ' +
      '  AND "serverBlocklist"."targetServerId" = "accountActor"."serverId"' +
      ')'
    )
  }

  // Only list public/published videos
  if (!options.filter || options.filter !== 'all-local') {
    and.push(
      `("video"."state" = ${VideoState.PUBLISHED} OR ` +
      `("video"."state" = ${VideoState.TO_TRANSCODE} AND "video"."waitTranscoding" IS false))`
    )

    if (options.user) {
      and.push(
        `("video"."privacy" = ${VideoPrivacy.PUBLIC} OR "video"."privacy" = ${VideoPrivacy.INTERNAL})`
      )
    } else { // Or only public videos
      and.push(
        `"video"."privacy" = ${VideoPrivacy.PUBLIC}`
      )
    }
  }

  if (options.videoPlaylistId) {
    joins.push(
      'INNER JOIN "videoPlaylistElement" "video"."id" = "videoPlaylistElement"."videoId" ' +
      'AND "videoPlaylistElement"."videoPlaylistId" = :videoPlaylistId'
    )

    replacements.videoPlaylistId = options.videoPlaylistId
  }

  if (options.filter && (options.filter === 'local' || options.filter === 'all-local')) {
    and.push('"video"."remote" IS FALSE')
  }

  if (options.accountId) {
    and.push('"account"."id" = :accountId')
    replacements.accountId = options.accountId
  }

  if (options.videoChannelId) {
    and.push('"videoChannel"."id" = :videoChannelId')
    replacements.videoChannelId = options.videoChannelId
  }

  if (options.followerActorId) {
    let query =
      '(' +
      '  EXISTS (' +
      '    SELECT 1 FROM "videoShare" ' +
      '    INNER JOIN "actorFollow" "actorFollowShare" ON "actorFollowShare"."targetActorId" = "videoShare"."actorId" ' +
      '    AND "actorFollowShare"."actorId" = :followerActorId AND "actorFollowShare"."state" = \'accepted\' ' +
      '    WHERE "videoShare"."videoId" = "video"."id"' +
      '  )' +
      '  OR' +
      '  EXISTS (' +
      '    SELECT 1 from "actorFollow" ' +
      '    WHERE "actorFollow"."targetActorId" = "videoChannel"."actorId" AND "actorFollow"."actorId" = :followerActorId ' +
      '    AND "actorFollow"."state" = \'accepted\'' +
      '  )'

    if (options.includeLocalVideos) {
      query += '  OR "video"."remote" IS FALSE'
    }

    query += ')'

    and.push(query)
    replacements.followerActorId = options.followerActorId
  }

  if (options.withFiles === true) {
    and.push('EXISTS (SELECT 1 FROM "videoFile" WHERE "videoFile"."videoId" = "video"."id")')
  }

  if (options.tagsOneOf) {
    const tagsOneOfLower = options.tagsOneOf.map(t => t.toLowerCase())

    and.push(
      'EXISTS (' +
      '  SELECT 1 FROM "videoTag" ' +
      '  INNER JOIN "tag" ON "tag"."id" = "videoTag"."tagId" ' +
      '  WHERE lower("tag"."name") IN (' + createSafeIn(model, tagsOneOfLower) + ') ' +
      '  AND "video"."id" = "videoTag"."videoId"' +
      ')'
    )
  }

  if (options.tagsAllOf) {
    const tagsAllOfLower = options.tagsAllOf.map(t => t.toLowerCase())

    and.push(
      'EXISTS (' +
      '  SELECT 1 FROM "videoTag" ' +
      '  INNER JOIN "tag" ON "tag"."id" = "videoTag"."tagId" ' +
      '  WHERE lower("tag"."name") IN (' + createSafeIn(model, tagsAllOfLower) + ') ' +
      '  AND "video"."id" = "videoTag"."videoId" ' +
      '  GROUP BY "videoTag"."videoId" HAVING COUNT(*) = ' + tagsAllOfLower.length +
      ')'
    )
  }

  if (options.nsfw === true) {
    and.push('"video"."nsfw" IS TRUE')
  }

  if (options.nsfw === false) {
    and.push('"video"."nsfw" IS FALSE')
  }

  if (options.categoryOneOf) {
    and.push('"video"."category" IN (:categoryOneOf)')
    replacements.categoryOneOf = options.categoryOneOf
  }

  if (options.licenceOneOf) {
    and.push('"video"."licence" IN (:licenceOneOf)')
    replacements.licenceOneOf = options.licenceOneOf
  }

  if (options.languageOneOf) {
    const languages = options.languageOneOf.filter(l => l && l !== '_unknown')
    const languagesQueryParts: string[] = []

    if (languages.length !== 0) {
      languagesQueryParts.push('"video"."language" IN (:languageOneOf)')
      replacements.languageOneOf = languages

      languagesQueryParts.push(
        'EXISTS (' +
        '  SELECT 1 FROM "videoCaption" WHERE "videoCaption"."language" ' +
        '  IN (' + createSafeIn(model, languages) + ') AND ' +
        '  "videoCaption"."videoId" = "video"."id"' +
        ')'
      )
    }

    if (options.languageOneOf.includes('_unknown')) {
      languagesQueryParts.push('"video"."language" IS NULL')
    }

    if (languagesQueryParts.length !== 0) {
      and.push('(' + languagesQueryParts.join(' OR ') + ')')
    }
  }

  // We don't exclude results in this if so if we do a count we don't need to add this complex clauses
  if (options.trendingDays && options.isCount !== true) {
    const viewsGteDate = new Date(new Date().getTime() - (24 * 3600 * 1000) * options.trendingDays)

    joins.push('LEFT JOIN "videoView" ON "video"."id" = "videoView"."videoId" AND "videoView"."startDate" >= :viewsGteDate')
    replacements.viewsGteDate = viewsGteDate

    attributes.push('COALESCE(SUM("videoView"."views"), 0) AS "videoViewsSum"')

    group = 'GROUP BY "video"."id"'
  }

  if (options.historyOfUser) {
    joins.push('INNER JOIN "userVideoHistory" on "video"."id" = "userVideoHistory"."videoId"')

    and.push('"userVideoHistory"."userId" = :historyOfUser')
    replacements.historyOfUser = options.historyOfUser.id
  }

  if (options.startDate) {
    and.push('"video"."publishedAt" >= :startDate')
    replacements.startDate = options.startDate
  }

  if (options.endDate) {
    and.push('"video"."publishedAt" <= :endDate')
    replacements.endDate = options.endDate
  }

  if (options.originallyPublishedStartDate) {
    and.push('"video"."originallyPublishedAt" >= :originallyPublishedStartDate')
    replacements.originallyPublishedStartDate = options.originallyPublishedStartDate
  }

  if (options.originallyPublishedEndDate) {
    and.push('"video"."originallyPublishedAt" <= :originallyPublishedEndDate')
    replacements.originallyPublishedEndDate = options.originallyPublishedEndDate
  }

  if (options.durationMin) {
    and.push('"video"."duration" >= :durationMin')
    replacements.durationMin = options.durationMin
  }

  if (options.durationMax) {
    and.push('"video"."duration" <= :durationMax')
    replacements.durationMax = options.durationMax
  }

  if (options.search) {
    const escapedSearch = model.sequelize.escape(options.search)
    const escapedLikeSearch = model.sequelize.escape('%' + options.search + '%')

    cte.push(
      '"trigramSearch" AS (' +
      '  SELECT "video"."id", ' +
      `  similarity(lower(immutable_unaccent("video"."name")), lower(immutable_unaccent(${escapedSearch}))) as similarity ` +
      '  FROM "video" ' +
      '  WHERE lower(immutable_unaccent("video"."name")) % lower(immutable_unaccent(' + escapedSearch + ')) OR ' +
      '        lower(immutable_unaccent("video"."name")) LIKE lower(immutable_unaccent(' + escapedLikeSearch + '))' +
      ')'
    )

    joins.push('LEFT JOIN "trigramSearch" ON "video"."id" = "trigramSearch"."id"')

    let base = '(' +
    '  "trigramSearch"."id" IS NOT NULL OR ' +
    '  EXISTS (' +
    '    SELECT 1 FROM "videoTag" ' +
    '    INNER JOIN "tag" ON "tag"."id" = "videoTag"."tagId" ' +
    `    WHERE lower("tag"."name") = ${escapedSearch} ` +
    '    AND "video"."id" = "videoTag"."videoId"' +
    '  )'

    if (validator.isUUID(options.search)) {
      base += ` OR "video"."uuid" = ${escapedSearch}`
    }

    base += ')'
    and.push(base)

    attributes.push(`COALESCE("trigramSearch"."similarity", 0) as similarity`)
  } else {
    attributes.push('0 as similarity')
  }

  if (options.isCount === true) attributes = [ 'COUNT(*) as "total"' ]

  let suffix = ''
  let order = ''
  if (options.isCount !== true) {

    if (exists(options.sort)) {
      if (options.sort === '-originallyPublishedAt' || options.sort === 'originallyPublishedAt') {
        attributes.push('COALESCE("video"."originallyPublishedAt", "video"."publishedAt") AS "publishedAtForOrder"')
      }

      order = buildOrder(options.sort)
      suffix += `${order} `
    }

    if (exists(options.count)) {
      const count = parseInt(options.count + '', 10)
      suffix += `LIMIT ${count} `
    }

    if (exists(options.start)) {
      const start = parseInt(options.start + '', 10)
      suffix += `OFFSET ${start} `
    }
  }

  const cteString = cte.length !== 0
    ? `WITH ${cte.join(', ')} `
    : ''

  const query = cteString +
    'SELECT ' + attributes.join(', ') + ' ' +
    'FROM "video" ' + joins.join(' ') + ' ' +
    'WHERE ' + and.join(' AND ') + ' ' +
    group + ' ' +
    having + ' ' +
    suffix

  return { query, replacements, order }
}

function buildOrder (value: string) {
  const { direction, field } = buildDirectionAndField(value)
  if (field.match(/^[a-zA-Z."]+$/) === null) throw new Error('Invalid sort column ' + field)

  if (field.toLowerCase() === 'random') return 'ORDER BY RANDOM()'

  if (field.toLowerCase() === 'trending') { // Sort by aggregation
    return `ORDER BY "videoViewsSum" ${direction}, "video"."views" ${direction}`
  }

  let firstSort: string

  if (field.toLowerCase() === 'match') { // Search
    firstSort = '"similarity"'
  } else if (field === 'originallyPublishedAt') {
    firstSort = '"publishedAtForOrder"'
  } else if (field.includes('.')) {
    firstSort = field
  } else {
    firstSort = `"video"."${field}"`
  }

  return `ORDER BY ${firstSort} ${direction}, "video"."id" ASC`
}

function wrapForAPIResults (baseQuery: string, replacements: any, options: BuildVideosQueryOptions, order: string) {
  const attributes = {
    '"video".*': '',
    '"VideoChannel"."id"': '"VideoChannel.id"',
    '"VideoChannel"."name"': '"VideoChannel.name"',
    '"VideoChannel"."description"': '"VideoChannel.description"',
    '"VideoChannel"."actorId"': '"VideoChannel.actorId"',
    '"VideoChannel->Actor"."id"': '"VideoChannel.Actor.id"',
    '"VideoChannel->Actor"."preferredUsername"': '"VideoChannel.Actor.preferredUsername"',
    '"VideoChannel->Actor"."url"': '"VideoChannel.Actor.url"',
    '"VideoChannel->Actor"."serverId"': '"VideoChannel.Actor.serverId"',
    '"VideoChannel->Actor"."avatarId"': '"VideoChannel.Actor.avatarId"',
    '"VideoChannel->Account"."id"': '"VideoChannel.Account.id"',
    '"VideoChannel->Account"."name"': '"VideoChannel.Account.name"',
    '"VideoChannel->Account->Actor"."id"': '"VideoChannel.Account.Actor.id"',
    '"VideoChannel->Account->Actor"."preferredUsername"': '"VideoChannel.Account.Actor.preferredUsername"',
    '"VideoChannel->Account->Actor"."url"': '"VideoChannel.Account.Actor.url"',
    '"VideoChannel->Account->Actor"."serverId"': '"VideoChannel.Account.Actor.serverId"',
    '"VideoChannel->Account->Actor"."avatarId"': '"VideoChannel.Account.Actor.avatarId"',
    '"VideoChannel->Actor->Server"."id"': '"VideoChannel.Actor.Server.id"',
    '"VideoChannel->Actor->Server"."host"': '"VideoChannel.Actor.Server.host"',
    '"VideoChannel->Actor->Avatar"."id"': '"VideoChannel.Actor.Avatar.id"',
    '"VideoChannel->Actor->Avatar"."filename"': '"VideoChannel.Actor.Avatar.filename"',
    '"VideoChannel->Actor->Avatar"."fileUrl"': '"VideoChannel.Actor.Avatar.fileUrl"',
    '"VideoChannel->Actor->Avatar"."onDisk"': '"VideoChannel.Actor.Avatar.onDisk"',
    '"VideoChannel->Actor->Avatar"."createdAt"': '"VideoChannel.Actor.Avatar.createdAt"',
    '"VideoChannel->Actor->Avatar"."updatedAt"': '"VideoChannel.Actor.Avatar.updatedAt"',
    '"VideoChannel->Account->Actor->Server"."id"': '"VideoChannel.Account.Actor.Server.id"',
    '"VideoChannel->Account->Actor->Server"."host"': '"VideoChannel.Account.Actor.Server.host"',
    '"VideoChannel->Account->Actor->Avatar"."id"': '"VideoChannel.Account.Actor.Avatar.id"',
    '"VideoChannel->Account->Actor->Avatar"."filename"': '"VideoChannel.Account.Actor.Avatar.filename"',
    '"VideoChannel->Account->Actor->Avatar"."fileUrl"': '"VideoChannel.Account.Actor.Avatar.fileUrl"',
    '"VideoChannel->Account->Actor->Avatar"."onDisk"': '"VideoChannel.Account.Actor.Avatar.onDisk"',
    '"VideoChannel->Account->Actor->Avatar"."createdAt"': '"VideoChannel.Account.Actor.Avatar.createdAt"',
    '"VideoChannel->Account->Actor->Avatar"."updatedAt"': '"VideoChannel.Account.Actor.Avatar.updatedAt"',
    '"Thumbnails"."id"': '"Thumbnails.id"',
    '"Thumbnails"."type"': '"Thumbnails.type"',
    '"Thumbnails"."filename"': '"Thumbnails.filename"'
  }

  const joins = [
    'INNER JOIN "video" ON "tmp"."id" = "video"."id"',

    'INNER JOIN "videoChannel" AS "VideoChannel" ON "video"."channelId" = "VideoChannel"."id"',
    'INNER JOIN "actor" AS "VideoChannel->Actor" ON "VideoChannel"."actorId" = "VideoChannel->Actor"."id"',
    'INNER JOIN "account" AS "VideoChannel->Account" ON "VideoChannel"."accountId" = "VideoChannel->Account"."id"',
    'INNER JOIN "actor" AS "VideoChannel->Account->Actor" ON "VideoChannel->Account"."actorId" = "VideoChannel->Account->Actor"."id"',

    'LEFT OUTER JOIN "server" AS "VideoChannel->Actor->Server" ON "VideoChannel->Actor"."serverId" = "VideoChannel->Actor->Server"."id"',
    'LEFT OUTER JOIN "avatar" AS "VideoChannel->Actor->Avatar" ON "VideoChannel->Actor"."avatarId" = "VideoChannel->Actor->Avatar"."id"',

    'LEFT OUTER JOIN "server" AS "VideoChannel->Account->Actor->Server" ' +
      'ON "VideoChannel->Account->Actor"."serverId" = "VideoChannel->Account->Actor->Server"."id"',

    'LEFT OUTER JOIN "avatar" AS "VideoChannel->Account->Actor->Avatar" ' +
      'ON "VideoChannel->Account->Actor"."avatarId" = "VideoChannel->Account->Actor->Avatar"."id"',

    'LEFT OUTER JOIN "thumbnail" AS "Thumbnails" ON "video"."id" = "Thumbnails"."videoId"'
  ]

  if (options.withFiles) {
    joins.push('INNER JOIN "videoFile" AS "VideoFiles" ON "VideoFiles"."videoId" = "video"."id"')

    Object.assign(attributes, {
      '"VideoFiles"."id"': '"VideoFiles.id"',
      '"VideoFiles"."createdAt"': '"VideoFiles.createdAt"',
      '"VideoFiles"."updatedAt"': '"VideoFiles.updatedAt"',
      '"VideoFiles"."resolution"': '"VideoFiles.resolution"',
      '"VideoFiles"."size"': '"VideoFiles.size"',
      '"VideoFiles"."extname"': '"VideoFiles.extname"',
      '"VideoFiles"."infoHash"': '"VideoFiles.infoHash"',
      '"VideoFiles"."fps"': '"VideoFiles.fps"',
      '"VideoFiles"."videoId"': '"VideoFiles.videoId"'
    })
  }

  if (options.user) {
    joins.push(
      'LEFT OUTER JOIN "userVideoHistory" ' +
      'ON "video"."id" = "userVideoHistory"."videoId" AND "userVideoHistory"."userId" = :userVideoHistoryId'
    )
    replacements.userVideoHistoryId = options.user.id

    Object.assign(attributes, {
      '"userVideoHistory"."id"': '"userVideoHistory.id"',
      '"userVideoHistory"."currentTime"': '"userVideoHistory.currentTime"'
    })
  }

  if (options.videoPlaylistId) {
    joins.push(
      'INNER JOIN "videoPlaylistElement" as "VideoPlaylistElement" ON "videoPlaylistElement"."videoId" = "video"."id" ' +
      'AND "VideoPlaylistElement"."videoPlaylistId" = :videoPlaylistId'
    )
    replacements.videoPlaylistId = options.videoPlaylistId

    Object.assign(attributes, {
      '"VideoPlaylistElement"."createdAt"': '"VideoPlaylistElement.createdAt"',
      '"VideoPlaylistElement"."updatedAt"': '"VideoPlaylistElement.updatedAt"',
      '"VideoPlaylistElement"."url"': '"VideoPlaylistElement.url"',
      '"VideoPlaylistElement"."position"': '"VideoPlaylistElement.position"',
      '"VideoPlaylistElement"."startTimestamp"': '"VideoPlaylistElement.startTimestamp"',
      '"VideoPlaylistElement"."stopTimestamp"': '"VideoPlaylistElement.stopTimestamp"',
      '"VideoPlaylistElement"."videoPlaylistId"': '"VideoPlaylistElement.videoPlaylistId"'
    })
  }

  const select = 'SELECT ' + Object.keys(attributes).map(key => {
    const value = attributes[key]
    if (value) return `${key} AS ${value}`

    return key
  }).join(', ')

  return `${select} FROM (${baseQuery}) AS "tmp" ${joins.join(' ')} ${order}`
}

export {
  buildListQuery,
  wrapForAPIResults
}