import { FindOptions, Op, Order, QueryTypes, Sequelize, Transaction } from 'sequelize'
import {
  AllowNull,
  BelongsTo,
  Column,
  CreatedAt,
  DataType,
  ForeignKey,
  HasMany,
  Is,
  Model,
  Scopes,
  Table,
  UpdatedAt
} from 'sequelize-typescript'
import { getServerActor } from '@server/models/application/application'
import { MAccount, MAccountId, MUserAccountId } from '@server/types/models'
import { pick, uniqify } from '@shared/core-utils'
import { AttributesOnly } from '@shared/typescript-utils'
import { ActivityTagObject, ActivityTombstoneObject } from '../../../shared/models/activitypub/objects/common-objects'
import { VideoCommentObject } from '../../../shared/models/activitypub/objects/video-comment-object'
import { VideoComment, VideoCommentAdmin } from '../../../shared/models/videos/comment/video-comment.model'
import { actorNameAlphabet } from '../../helpers/custom-validators/activitypub/actor'
import { isActivityPubUrlValid } from '../../helpers/custom-validators/activitypub/misc'
import { regexpCapture } from '../../helpers/regexp'
import { CONSTRAINTS_FIELDS, WEBSERVER } from '../../initializers/constants'
import {
  MComment,
  MCommentAdminFormattable,
  MCommentAP,
  MCommentFormattable,
  MCommentId,
  MCommentOwner,
  MCommentOwnerReplyVideoLight,
  MCommentOwnerVideo,
  MCommentOwnerVideoFeed,
  MCommentOwnerVideoReply,
  MVideoImmutable
} from '../../types/models/video'
import { VideoCommentAbuseModel } from '../abuse/video-comment-abuse'
import { AccountModel } from '../account/account'
import { ActorModel } from '../actor/actor'
import { buildLocalAccountIdsIn, buildSQLAttributes, throwIfNotValid } from '../shared'
import { ListVideoCommentsOptions, VideoCommentListQueryBuilder } from './sql/comment/video-comment-list-query-builder'
import { VideoModel } from './video'
import { VideoChannelModel } from './video-channel'

export enum ScopeNames {
  WITH_ACCOUNT = 'WITH_ACCOUNT',
  WITH_IN_REPLY_TO = 'WITH_IN_REPLY_TO',
  WITH_VIDEO = 'WITH_VIDEO'
}

@Scopes(() => ({
  [ScopeNames.WITH_ACCOUNT]: {
    include: [
      {
        model: AccountModel
      }
    ]
  },
  [ScopeNames.WITH_IN_REPLY_TO]: {
    include: [
      {
        model: VideoCommentModel,
        as: 'InReplyToVideoComment'
      }
    ]
  },
  [ScopeNames.WITH_VIDEO]: {
    include: [
      {
        model: VideoModel,
        required: true,
        include: [
          {
            model: VideoChannelModel,
            required: true,
            include: [
              {
                model: AccountModel,
                required: true
              }
            ]
          }
        ]
      }
    ]
  }
}))
@Table({
  tableName: 'videoComment',
  indexes: [
    {
      fields: [ 'videoId' ]
    },
    {
      fields: [ 'videoId', 'originCommentId' ]
    },
    {
      fields: [ 'url' ],
      unique: true
    },
    {
      fields: [ 'accountId' ]
    },
    {
      fields: [
        { name: 'createdAt', order: 'DESC' }
      ]
    }
  ]
})
export class VideoCommentModel extends Model<Partial<AttributesOnly<VideoCommentModel>>> {
  @CreatedAt
  createdAt: Date

  @UpdatedAt
  updatedAt: Date

  @AllowNull(true)
  @Column(DataType.DATE)
  deletedAt: Date

  @AllowNull(false)
  @Is('VideoCommentUrl', value => throwIfNotValid(value, isActivityPubUrlValid, 'url'))
  @Column(DataType.STRING(CONSTRAINTS_FIELDS.VIDEOS.URL.max))
  url: string

  @AllowNull(false)
  @Column(DataType.TEXT)
  text: string

  @ForeignKey(() => VideoCommentModel)
  @Column
  originCommentId: number

  @BelongsTo(() => VideoCommentModel, {
    foreignKey: {
      name: 'originCommentId',
      allowNull: true
    },
    as: 'OriginVideoComment',
    onDelete: 'CASCADE'
  })
  OriginVideoComment: VideoCommentModel

  @ForeignKey(() => VideoCommentModel)
  @Column
  inReplyToCommentId: number

  @BelongsTo(() => VideoCommentModel, {
    foreignKey: {
      name: 'inReplyToCommentId',
      allowNull: true
    },
    as: 'InReplyToVideoComment',
    onDelete: 'CASCADE'
  })
  InReplyToVideoComment: VideoCommentModel | null

  @ForeignKey(() => VideoModel)
  @Column
  videoId: number

  @BelongsTo(() => VideoModel, {
    foreignKey: {
      allowNull: false
    },
    onDelete: 'CASCADE'
  })
  Video: VideoModel

  @ForeignKey(() => AccountModel)
  @Column
  accountId: number

  @BelongsTo(() => AccountModel, {
    foreignKey: {
      allowNull: true
    },
    onDelete: 'CASCADE'
  })
  Account: AccountModel

  @HasMany(() => VideoCommentAbuseModel, {
    foreignKey: {
      name: 'videoCommentId',
      allowNull: true
    },
    onDelete: 'set null'
  })
  CommentAbuses: VideoCommentAbuseModel[]

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

  static getSQLAttributes (tableName: string, aliasPrefix = '') {
    return buildSQLAttributes({
      model: this,
      tableName,
      aliasPrefix
    })
  }

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

  static loadById (id: number, t?: Transaction): Promise<MComment> {
    const query: FindOptions = {
      where: {
        id
      }
    }

    if (t !== undefined) query.transaction = t

    return VideoCommentModel.findOne(query)
  }

  static loadByIdAndPopulateVideoAndAccountAndReply (id: number, t?: Transaction): Promise<MCommentOwnerVideoReply> {
    const query: FindOptions = {
      where: {
        id
      }
    }

    if (t !== undefined) query.transaction = t

    return VideoCommentModel
      .scope([ ScopeNames.WITH_VIDEO, ScopeNames.WITH_ACCOUNT, ScopeNames.WITH_IN_REPLY_TO ])
      .findOne(query)
  }

  static loadByUrlAndPopulateAccountAndVideo (url: string, t?: Transaction): Promise<MCommentOwnerVideo> {
    const query: FindOptions = {
      where: {
        url
      }
    }

    if (t !== undefined) query.transaction = t

    return VideoCommentModel.scope([ ScopeNames.WITH_ACCOUNT, ScopeNames.WITH_VIDEO ]).findOne(query)
  }

  static loadByUrlAndPopulateReplyAndVideoUrlAndAccount (url: string, t?: Transaction): Promise<MCommentOwnerReplyVideoLight> {
    const query: FindOptions = {
      where: {
        url
      },
      include: [
        {
          attributes: [ 'id', 'url' ],
          model: VideoModel.unscoped()
        }
      ]
    }

    if (t !== undefined) query.transaction = t

    return VideoCommentModel.scope([ ScopeNames.WITH_IN_REPLY_TO, ScopeNames.WITH_ACCOUNT ]).findOne(query)
  }

  static listCommentsForApi (parameters: {
    start: number
    count: number
    sort: string

    onLocalVideo?: boolean
    isLocal?: boolean
    search?: string
    searchAccount?: string
    searchVideo?: string
  }) {
    const queryOptions: ListVideoCommentsOptions = {
      ...pick(parameters, [ 'start', 'count', 'sort', 'isLocal', 'search', 'searchVideo', 'searchAccount', 'onLocalVideo' ]),

      selectType: 'api',
      notDeleted: true
    }

    return Promise.all([
      new VideoCommentListQueryBuilder(VideoCommentModel.sequelize, queryOptions).listComments<MCommentAdminFormattable>(),
      new VideoCommentListQueryBuilder(VideoCommentModel.sequelize, queryOptions).countComments()
    ]).then(([ rows, count ]) => {
      return { total: count, data: rows }
    })
  }

  static async listThreadsForApi (parameters: {
    videoId: number
    isVideoOwned: boolean
    start: number
    count: number
    sort: string
    user?: MUserAccountId
  }) {
    const { videoId, user } = parameters

    const blockerAccountIds = await VideoCommentModel.buildBlockerAccountIds({ user })

    const commonOptions: ListVideoCommentsOptions = {
      selectType: 'api',
      videoId,
      blockerAccountIds
    }

    const listOptions: ListVideoCommentsOptions = {
      ...commonOptions,
      ...pick(parameters, [ 'sort', 'start', 'count' ]),

      isThread: true,
      includeReplyCounters: true
    }

    const countOptions: ListVideoCommentsOptions = {
      ...commonOptions,

      isThread: true
    }

    const notDeletedCountOptions: ListVideoCommentsOptions = {
      ...commonOptions,

      notDeleted: true
    }

    return Promise.all([
      new VideoCommentListQueryBuilder(VideoCommentModel.sequelize, listOptions).listComments<MCommentAdminFormattable>(),
      new VideoCommentListQueryBuilder(VideoCommentModel.sequelize, countOptions).countComments(),
      new VideoCommentListQueryBuilder(VideoCommentModel.sequelize, notDeletedCountOptions).countComments()
    ]).then(([ rows, count, totalNotDeletedComments ]) => {
      return { total: count, data: rows, totalNotDeletedComments }
    })
  }

  static async listThreadCommentsForApi (parameters: {
    videoId: number
    threadId: number
    user?: MUserAccountId
  }) {
    const { user } = parameters

    const blockerAccountIds = await VideoCommentModel.buildBlockerAccountIds({ user })

    const queryOptions: ListVideoCommentsOptions = {
      ...pick(parameters, [ 'videoId', 'threadId' ]),

      selectType: 'api',
      sort: 'createdAt',

      blockerAccountIds,
      includeReplyCounters: true
    }

    return Promise.all([
      new VideoCommentListQueryBuilder(VideoCommentModel.sequelize, queryOptions).listComments<MCommentAdminFormattable>(),
      new VideoCommentListQueryBuilder(VideoCommentModel.sequelize, queryOptions).countComments()
    ]).then(([ rows, count ]) => {
      return { total: count, data: rows }
    })
  }

  static listThreadParentComments (comment: MCommentId, t: Transaction, order: 'ASC' | 'DESC' = 'ASC'): Promise<MCommentOwner[]> {
    const query = {
      order: [ [ 'createdAt', order ] ] as Order,
      where: {
        id: {
          [Op.in]: Sequelize.literal('(' +
            'WITH RECURSIVE children (id, "inReplyToCommentId") AS ( ' +
              `SELECT id, "inReplyToCommentId" FROM "videoComment" WHERE id = ${comment.id} ` +
              'UNION ' +
              'SELECT "parent"."id", "parent"."inReplyToCommentId" FROM "videoComment" "parent" ' +
              'INNER JOIN "children" ON "children"."inReplyToCommentId" = "parent"."id"' +
            ') ' +
            'SELECT id FROM children' +
          ')'),
          [Op.ne]: comment.id
        }
      },
      transaction: t
    }

    return VideoCommentModel
      .scope([ ScopeNames.WITH_ACCOUNT ])
      .findAll(query)
  }

  static async listAndCountByVideoForAP (parameters: {
    video: MVideoImmutable
    start: number
    count: number
  }) {
    const { video } = parameters

    const blockerAccountIds = await VideoCommentModel.buildBlockerAccountIds({ user: null })

    const queryOptions: ListVideoCommentsOptions = {
      ...pick(parameters, [ 'start', 'count' ]),

      selectType: 'comment-only',
      videoId: video.id,
      sort: 'createdAt',

      blockerAccountIds
    }

    return Promise.all([
      new VideoCommentListQueryBuilder(VideoCommentModel.sequelize, queryOptions).listComments<MComment>(),
      new VideoCommentListQueryBuilder(VideoCommentModel.sequelize, queryOptions).countComments()
    ]).then(([ rows, count ]) => {
      return { total: count, data: rows }
    })
  }

  static async listForFeed (parameters: {
    start: number
    count: number
    videoId?: number
    accountId?: number
    videoChannelId?: number
  }) {
    const blockerAccountIds = await VideoCommentModel.buildBlockerAccountIds({ user: null })

    const queryOptions: ListVideoCommentsOptions = {
      ...pick(parameters, [ 'start', 'count', 'accountId', 'videoId', 'videoChannelId' ]),

      selectType: 'feed',

      sort: '-createdAt',
      onPublicVideo: true,
      notDeleted: true,

      blockerAccountIds
    }

    return new VideoCommentListQueryBuilder(VideoCommentModel.sequelize, queryOptions).listComments<MCommentOwnerVideoFeed>()
  }

  static listForBulkDelete (ofAccount: MAccount, filter: { onVideosOfAccount?: MAccountId } = {}) {
    const queryOptions: ListVideoCommentsOptions = {
      selectType: 'comment-only',

      accountId: ofAccount.id,
      videoAccountOwnerId: filter.onVideosOfAccount?.id,

      notDeleted: true,
      count: 5000
    }

    return new VideoCommentListQueryBuilder(VideoCommentModel.sequelize, queryOptions).listComments<MComment>()
  }

  static async getStats () {
    const totalLocalVideoComments = await VideoCommentModel.count({
      include: [
        {
          model: AccountModel.unscoped(),
          required: true,
          include: [
            {
              model: ActorModel.unscoped(),
              required: true,
              where: {
                serverId: null
              }
            }
          ]
        }
      ]
    })
    const totalVideoComments = await VideoCommentModel.count()

    return {
      totalLocalVideoComments,
      totalVideoComments
    }
  }

  static listRemoteCommentUrlsOfLocalVideos () {
    const query = `SELECT "videoComment".url FROM "videoComment" ` +
      `INNER JOIN account ON account.id = "videoComment"."accountId" ` +
      `INNER JOIN actor ON actor.id = "account"."actorId" AND actor."serverId" IS NOT NULL ` +
      `INNER JOIN video ON video.id = "videoComment"."videoId" AND video.remote IS FALSE`

    return VideoCommentModel.sequelize.query<{ url: string }>(query, {
      type: QueryTypes.SELECT,
      raw: true
    }).then(rows => rows.map(r => r.url))
  }

  static cleanOldCommentsOf (videoId: number, beforeUpdatedAt: Date) {
    const query = {
      where: {
        updatedAt: {
          [Op.lt]: beforeUpdatedAt
        },
        videoId,
        accountId: {
          [Op.notIn]: buildLocalAccountIdsIn()
        },
        // Do not delete Tombstones
        deletedAt: null
      }
    }

    return VideoCommentModel.destroy(query)
  }

  getCommentStaticPath () {
    return this.Video.getWatchStaticPath() + ';threadId=' + this.getThreadId()
  }

  getThreadId (): number {
    return this.originCommentId || this.id
  }

  isOwned () {
    if (!this.Account) return false

    return this.Account.isOwned()
  }

  markAsDeleted () {
    this.text = ''
    this.deletedAt = new Date()
    this.accountId = null
  }

  isDeleted () {
    return this.deletedAt !== null
  }

  extractMentions () {
    let result: string[] = []

    const localMention = `@(${actorNameAlphabet}+)`
    const remoteMention = `${localMention}@${WEBSERVER.HOST}`

    const mentionRegex = this.isOwned()
      ? '(?:(?:' + remoteMention + ')|(?:' + localMention + '))' // Include local mentions?
      : '(?:' + remoteMention + ')'

    const firstMentionRegex = new RegExp(`^${mentionRegex} `, 'g')
    const endMentionRegex = new RegExp(` ${mentionRegex}$`, 'g')
    const remoteMentionsRegex = new RegExp(' ' + remoteMention + ' ', 'g')

    result = result.concat(
      regexpCapture(this.text, firstMentionRegex)
        .map(([ , username1, username2 ]) => username1 || username2),

      regexpCapture(this.text, endMentionRegex)
        .map(([ , username1, username2 ]) => username1 || username2),

      regexpCapture(this.text, remoteMentionsRegex)
        .map(([ , username ]) => username)
    )

    // Include local mentions
    if (this.isOwned()) {
      const localMentionsRegex = new RegExp(' ' + localMention + ' ', 'g')

      result = result.concat(
        regexpCapture(this.text, localMentionsRegex)
          .map(([ , username ]) => username)
      )
    }

    return uniqify(result)
  }

  toFormattedJSON (this: MCommentFormattable) {
    return {
      id: this.id,
      url: this.url,
      text: this.text,

      threadId: this.getThreadId(),
      inReplyToCommentId: this.inReplyToCommentId || null,
      videoId: this.videoId,

      createdAt: this.createdAt,
      updatedAt: this.updatedAt,
      deletedAt: this.deletedAt,

      isDeleted: this.isDeleted(),

      totalRepliesFromVideoAuthor: this.get('totalRepliesFromVideoAuthor') || 0,
      totalReplies: this.get('totalReplies') || 0,

      account: this.Account
        ? this.Account.toFormattedJSON()
        : null
    } as VideoComment
  }

  toFormattedAdminJSON (this: MCommentAdminFormattable) {
    return {
      id: this.id,
      url: this.url,
      text: this.text,

      threadId: this.getThreadId(),
      inReplyToCommentId: this.inReplyToCommentId || null,
      videoId: this.videoId,

      createdAt: this.createdAt,
      updatedAt: this.updatedAt,

      video: {
        id: this.Video.id,
        uuid: this.Video.uuid,
        name: this.Video.name
      },

      account: this.Account
        ? this.Account.toFormattedJSON()
        : null
    } as VideoCommentAdmin
  }

  toActivityPubObject (this: MCommentAP, threadParentComments: MCommentOwner[]): VideoCommentObject | ActivityTombstoneObject {
    let inReplyTo: string
    // New thread, so in AS we reply to the video
    if (this.inReplyToCommentId === null) {
      inReplyTo = this.Video.url
    } else {
      inReplyTo = this.InReplyToVideoComment.url
    }

    if (this.isDeleted()) {
      return {
        id: this.url,
        type: 'Tombstone',
        formerType: 'Note',
        inReplyTo,
        published: this.createdAt.toISOString(),
        updated: this.updatedAt.toISOString(),
        deleted: this.deletedAt.toISOString()
      }
    }

    const tag: ActivityTagObject[] = []
    for (const parentComment of threadParentComments) {
      if (!parentComment.Account) continue

      const actor = parentComment.Account.Actor

      tag.push({
        type: 'Mention',
        href: actor.url,
        name: `@${actor.preferredUsername}@${actor.getHost()}`
      })
    }

    return {
      type: 'Note' as 'Note',
      id: this.url,

      content: this.text,
      mediaType: 'text/markdown',

      inReplyTo,
      updated: this.updatedAt.toISOString(),
      published: this.createdAt.toISOString(),
      url: this.url,
      attributedTo: this.Account.Actor.url,
      tag
    }
  }

  private static async buildBlockerAccountIds (options: {
    user: MUserAccountId
  }): Promise<number[]> {
    const { user } = options

    const serverActor = await getServerActor()
    const blockerAccountIds = [ serverActor.Account.id ]

    if (user) blockerAccountIds.push(user.Account.id)

    return blockerAccountIds
  }
}