/*
 * SPDX-FileCopyrightText: syuilo and other misskey contributors
 * SPDX-License-Identifier: AGPL-3.0-only
 */

import { setImmediate } from 'node:timers/promises';
import * as mfm from '@transfem-org/sfm-js';
import { DataSource, In, IsNull, LessThan } from 'typeorm';
import * as Redis from 'ioredis';
import { Inject, Injectable, OnApplicationShutdown } from '@nestjs/common';
import RE2 from 're2';
import { extractMentions } from '@/misc/extract-mentions.js';
import { extractCustomEmojisFromMfm } from '@/misc/extract-custom-emojis-from-mfm.js';
import { extractHashtags } from '@/misc/extract-hashtags.js';
import type { IMentionedRemoteUsers } from '@/models/Note.js';
import { MiNote } from '@/models/Note.js';
import type { NoteEditRepository, ChannelFollowingsRepository, ChannelsRepository, FollowingsRepository, InstancesRepository, MiFollowing, MutingsRepository, NotesRepository, NoteThreadMutingsRepository, UserListMembershipsRepository, UserProfilesRepository, UsersRepository, PollsRepository } from '@/models/_.js';
import type { MiDriveFile } from '@/models/DriveFile.js';
import type { MiApp } from '@/models/App.js';
import { concat } from '@/misc/prelude/array.js';
import { IdService } from '@/core/IdService.js';
import type { MiUser, MiLocalUser, MiRemoteUser } from '@/models/User.js';
import { MiPoll, type IPoll } from '@/models/Poll.js';
import type { MiChannel } from '@/models/Channel.js';
import { normalizeForSearch } from '@/misc/normalize-for-search.js';
import { RelayService } from '@/core/RelayService.js';
import { FederatedInstanceService } from '@/core/FederatedInstanceService.js';
import { DI } from '@/di-symbols.js';
import type { Config } from '@/config.js';
import InstanceChart from '@/core/chart/charts/instance.js';
import ActiveUsersChart from '@/core/chart/charts/active-users.js';
import { GlobalEventService } from '@/core/GlobalEventService.js';
import { NotificationService } from '@/core/NotificationService.js';
import { WebhookService } from '@/core/WebhookService.js';
import { QueueService } from '@/core/QueueService.js';
import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
import { UserEntityService } from '@/core/entities/UserEntityService.js';
import { ApRendererService } from '@/core/activitypub/ApRendererService.js';
import { ApDeliverManagerService } from '@/core/activitypub/ApDeliverManagerService.js';
import { NoteReadService } from '@/core/NoteReadService.js';
import { RemoteUserResolveService } from '@/core/RemoteUserResolveService.js';
import { bindThis } from '@/decorators.js';
import { DB_MAX_NOTE_TEXT_LENGTH } from '@/const.js';
import { RoleService } from '@/core/RoleService.js';
import { MetaService } from '@/core/MetaService.js';
import { SearchService } from '@/core/SearchService.js';
import { FanoutTimelineService } from '@/core/FanoutTimelineService.js';
import { UtilityService } from '@/core/UtilityService.js';
import { UserBlockingService } from '@/core/UserBlockingService.js';
import { CacheService } from '@/core/CacheService.js';
import { isReply } from '@/misc/is-reply.js';
import { trackPromise } from '@/misc/promise-tracker.js';
import { isUserRelated } from '@/misc/is-user-related.js';

type NotificationType = 'reply' | 'renote' | 'quote' | 'mention';

class NotificationManager {
	private notifier: { id: MiUser['id']; };
	private note: MiNote;
	private queue: {
		target: MiLocalUser['id'];
		reason: NotificationType;
	}[];

	constructor(
		private mutingsRepository: MutingsRepository,
		private notificationService: NotificationService,
		notifier: { id: MiUser['id']; },
		note: MiNote,
	) {
		this.notifier = notifier;
		this.note = note;
		this.queue = [];
	}

	@bindThis
	public push(notifiee: MiLocalUser['id'], reason: NotificationType) {
		// 自分自身へは通知しない
		if (this.notifier.id === notifiee) return;

		const exist = this.queue.find(x => x.target === notifiee);

		if (exist) {
			// 「メンションされているかつ返信されている」場合は、メンションとしての通知ではなく返信としての通知にする
			if (reason !== 'mention') {
				exist.reason = reason;
			}
		} else {
			this.queue.push({
				reason: reason,
				target: notifiee,
			});
		}
	}

	@bindThis
	public async notify() {
		for (const x of this.queue) {
			if (x.reason === 'renote') {
				this.notificationService.createNotification(x.target, 'renote', {
					noteId: this.note.id,
					targetNoteId: this.note.renoteId!,
				}, this.notifier.id);
			} else {
				this.notificationService.createNotification(x.target, x.reason, {
					noteId: this.note.id,
				}, this.notifier.id);
			}
		}
	}
}

type MinimumUser = {
	id: MiUser['id'];
	host: MiUser['host'];
	username: MiUser['username'];
	uri: MiUser['uri'];
};

type Option = {
	createdAt?: Date | null;
	name?: string | null;
	text?: string | null;
	reply?: MiNote | null;
	renote?: MiNote | null;
	files?: MiDriveFile[] | null;
	poll?: IPoll | null;
	localOnly?: boolean | null;
	reactionAcceptance?: MiNote['reactionAcceptance'];
	cw?: string | null;
	visibility?: string;
	visibleUsers?: MinimumUser[] | null;
	channel?: MiChannel | null;
	apMentions?: MinimumUser[] | null;
	apHashtags?: string[] | null;
	apEmojis?: string[] | null;
	uri?: string | null;
	url?: string | null;
	app?: MiApp | null;
	updatedAt?: Date | null;
	editcount?: boolean | null;
};

@Injectable()
export class NoteEditService implements OnApplicationShutdown {
	#shutdownController = new AbortController();

	public static ContainsProhibitedWordsError = class extends Error {};

	constructor(
		@Inject(DI.config)
		private config: Config,

		@Inject(DI.db)
		private db: DataSource,

		@Inject(DI.redisForTimelines)
		private redisForTimelines: Redis.Redis,

		@Inject(DI.usersRepository)
		private usersRepository: UsersRepository,

		@Inject(DI.notesRepository)
		private notesRepository: NotesRepository,

		@Inject(DI.mutingsRepository)
		private mutingsRepository: MutingsRepository,

		@Inject(DI.instancesRepository)
		private instancesRepository: InstancesRepository,

		@Inject(DI.userProfilesRepository)
		private userProfilesRepository: UserProfilesRepository,

		@Inject(DI.userListMembershipsRepository)
		private userListMembershipsRepository: UserListMembershipsRepository,

		@Inject(DI.channelsRepository)
		private channelsRepository: ChannelsRepository,

		@Inject(DI.noteThreadMutingsRepository)
		private noteThreadMutingsRepository: NoteThreadMutingsRepository,

		@Inject(DI.followingsRepository)
		private followingsRepository: FollowingsRepository,

		@Inject(DI.channelFollowingsRepository)
		private channelFollowingsRepository: ChannelFollowingsRepository,

		@Inject(DI.noteEditRepository)
		private noteEditRepository: NoteEditRepository,

		@Inject(DI.pollsRepository)
		private pollsRepository: PollsRepository,

		private userEntityService: UserEntityService,
		private noteEntityService: NoteEntityService,
		private idService: IdService,
		private globalEventService: GlobalEventService,
		private queueService: QueueService,
		private fanoutTimelineService: FanoutTimelineService,
		private noteReadService: NoteReadService,
		private notificationService: NotificationService,
		private relayService: RelayService,
		private federatedInstanceService: FederatedInstanceService,
		private webhookService: WebhookService,
		private remoteUserResolveService: RemoteUserResolveService,
		private apDeliverManagerService: ApDeliverManagerService,
		private apRendererService: ApRendererService,
		private roleService: RoleService,
		private metaService: MetaService,
		private searchService: SearchService,
		private activeUsersChart: ActiveUsersChart,
		private instanceChart: InstanceChart,
		private utilityService: UtilityService,
		private userBlockingService: UserBlockingService,
		private cacheService: CacheService,
	) { }

	@bindThis
	public async edit(user: {
		id: MiUser['id'];
		username: MiUser['username'];
		host: MiUser['host'];
		isBot: MiUser['isBot'];
		noindex: MiUser['noindex'];
	}, editid: MiNote['id'], data: Option, silent = false): Promise<MiNote> {
		if (!editid) {
			throw new Error('fail');
		}

		const oldnote = await this.notesRepository.findOneBy({
			id: editid,
		});

		if (oldnote == null) {
			throw new Error('no such note');
		}

		if (oldnote.userId !== user.id) {
			throw new Error('not the author');
		}

		// チャンネル外にリプライしたら対象のスコープに合わせる
		// (クライアントサイドでやっても良い処理だと思うけどとりあえずサーバーサイドで)
		if (data.reply && data.channel && data.reply.channelId !== data.channel.id) {
			if (data.reply.channelId) {
				data.channel = await this.channelsRepository.findOneBy({ id: data.reply.channelId });
			} else {
				data.channel = null;
			}
		}

		// チャンネル内にリプライしたら対象のスコープに合わせる
		// (クライアントサイドでやっても良い処理だと思うけどとりあえずサーバーサイドで)
		if (data.reply && (data.channel == null) && data.reply.channelId) {
			data.channel = await this.channelsRepository.findOneBy({ id: data.reply.channelId });
		}

		if (data.visibility == null) data.visibility = 'public';
		if (data.localOnly == null) data.localOnly = false;
		if (data.channel != null) data.visibility = 'public';
		if (data.channel != null) data.visibleUsers = [];
		if (data.channel != null) data.localOnly = true;
		if (data.updatedAt == null) data.updatedAt = new Date();

		const meta = await this.metaService.fetch();

		if (data.visibility === 'public' && data.channel == null) {
			const sensitiveWords = meta.sensitiveWords;
			if (this.utilityService.isKeyWordIncluded(data.cw ?? data.text ?? '', sensitiveWords)) {
				data.visibility = 'home';
			} else if ((await this.roleService.getUserPolicies(user.id)).canPublicNote === false) {
				data.visibility = 'home';
			}
		}

		const inSilencedInstance = this.utilityService.isSilencedHost((meta).silencedHosts, user.host);

		if (data.visibility === 'public' && inSilencedInstance && user.host !== null) {
			data.visibility = 'home';
		}

		if (data.renote) {
			switch (data.renote.visibility) {
				case 'public':
					// public noteは無条件にrenote可能
					break;
				case 'home':
					// home noteはhome以下にrenote可能
					if (data.visibility === 'public') {
						data.visibility = 'home';
					}
					break;
				case 'followers':
					// 他人のfollowers noteはreject
					if (data.renote.userId !== user.id) {
						throw new Error('Renote target is not public or home');
					}

					// Renote対象がfollowersならfollowersにする
					data.visibility = 'followers';
					break;
				case 'specified':
					// specified / direct noteはreject
					throw new Error('Renote target is not public or home');
			}
		}

		// Check blocking
		if (data.renote && !this.isQuote(data)) {
			if (data.renote.userHost === null) {
				if (data.renote.userId !== user.id) {
					const blocked = await this.userBlockingService.checkBlocked(data.renote.userId, user.id);
					if (blocked) {
						throw new Error('blocked');
					}
				}
			}
		}

		// 返信対象がpublicではないならhomeにする
		if (data.reply && data.reply.visibility !== 'public' && data.visibility === 'public') {
			data.visibility = 'home';
		}

		// ローカルのみをRenoteしたらローカルのみにする
		if (data.renote && data.renote.localOnly && data.channel == null) {
			data.localOnly = true;
		}

		// ローカルのみにリプライしたらローカルのみにする
		if (data.reply && data.reply.localOnly && data.channel == null) {
			data.localOnly = true;
		}

		if (data.text) {
			if (data.text.length > DB_MAX_NOTE_TEXT_LENGTH) {
				data.text = data.text.slice(0, DB_MAX_NOTE_TEXT_LENGTH);
			}
			data.text = data.text.trim();
			if (data.text === '') {
				data.text = null;
			}
		} else {
			data.text = null;
		}

		let tags = data.apHashtags;
		let emojis = data.apEmojis;
		let mentionedUsers = data.apMentions;

		// Parse MFM if needed
		if (!tags || !emojis || !mentionedUsers) {
			const tokens = data.text ? mfm.parse(data.text)! : [];
			const cwTokens = data.cw ? mfm.parse(data.cw)! : [];
			const choiceTokens = data.poll && data.poll.choices
				? concat(data.poll.choices.map(choice => mfm.parse(choice)!))
				: [];

			const combinedTokens = tokens.concat(cwTokens).concat(choiceTokens);

			tags = data.apHashtags ?? extractHashtags(combinedTokens);

			emojis = data.apEmojis ?? extractCustomEmojisFromMfm(combinedTokens);

			mentionedUsers = data.apMentions ?? await this.extractMentionedUsers(user, combinedTokens);
		}

		tags = tags.filter(tag => Array.from(tag ?? '').length <= 128).splice(0, 32);

		if (data.reply && (user.id !== data.reply.userId) && !mentionedUsers.some(u => u.id === data.reply!.userId)) {
			mentionedUsers.push(await this.usersRepository.findOneByOrFail({ id: data.reply!.userId }));
		}

		if (data.visibility === 'specified') {
			if (data.visibleUsers == null) throw new Error('invalid param');

			for (const u of data.visibleUsers) {
				if (!mentionedUsers.some(x => x.id === u.id)) {
					mentionedUsers.push(u);
				}
			}

			if (data.reply && !data.visibleUsers.some(x => x.id === data.reply!.userId)) {
				data.visibleUsers.push(await this.usersRepository.findOneByOrFail({ id: data.reply!.userId }));
			}
		}

		if (user.host && !data.cw) {
			await this.federatedInstanceService.fetch(user.host).then(async i => {
				if (i.isNSFW) {
					data.cw = 'Instance is marked as NSFW';
				}
			});
		}

		const update: Partial<MiNote> = {};
		if (data.text !== oldnote.text) {
			update.text = data.text;
		}
		if (data.cw !== oldnote.cw) {
			update.cw = data.cw;
		}
		if (data.localOnly !== oldnote.localOnly) {
			update.localOnly = data.localOnly;
		}
		if (oldnote.hasPoll !== !!data.poll) {
			update.hasPoll = !!data.poll;
		}

		const poll = await this.pollsRepository.findOneBy({ noteId: oldnote.id });

		const oldPoll = poll ? { choices: poll.choices, multiple: poll.multiple, expiresAt: poll.expiresAt } : null;

		if (Object.keys(update).length > 0) {
			const exists = await this.noteEditRepository.findOneBy({ noteId: oldnote.id });

			await this.noteEditRepository.insert({
				id: this.idService.gen(),
				noteId: oldnote.id,
				oldText: oldnote.text || undefined,
				newText: update.text || undefined,
				cw: update.cw || undefined,
				fileIds: undefined,
				oldDate: exists ? oldnote.updatedAt as Date : this.idService.parse(oldnote.id).date,
				updatedAt: new Date(),
			});

			const note = new MiNote({
				id: oldnote.id,
				updatedAt: data.updatedAt ? data.updatedAt : new Date(),
				fileIds: data.files ? data.files.map(file => file.id) : [],
				replyId: data.reply ? data.reply.id : null,
				renoteId: data.renote ? data.renote.id : null,
				channelId: data.channel ? data.channel.id : null,
				threadId: data.reply
					? data.reply.threadId
						? data.reply.threadId
						: data.reply.id
					: null,
				name: data.name,
				text: data.text,
				hasPoll: data.poll != null,
				cw: data.cw ?? null,
				tags: tags.map(tag => normalizeForSearch(tag)),
				emojis,
				reactions: oldnote.reactions,
				userId: user.id,
				localOnly: data.localOnly!,
				reactionAcceptance: data.reactionAcceptance,
				visibility: data.visibility as any,
				visibleUserIds: data.visibility === 'specified'
					? data.visibleUsers
						? data.visibleUsers.map(u => u.id)
						: []
					: [],

				attachedFileTypes: data.files ? data.files.map(file => file.type) : [],

				// 以下非正規化データ
				replyUserId: data.reply ? data.reply.userId : null,
				replyUserHost: data.reply ? data.reply.userHost : null,
				renoteUserId: data.renote ? data.renote.userId : null,
				renoteUserHost: data.renote ? data.renote.userHost : null,
				userHost: user.host,
			});

			if (data.uri != null) note.uri = data.uri;
			if (data.url != null) note.url = data.url;

			if (mentionedUsers.length > 0) {
				note.mentions = mentionedUsers.map(u => u.id);
				const profiles = await this.userProfilesRepository.findBy({ userId: In(note.mentions) });
				note.mentionedRemoteUsers = JSON.stringify(mentionedUsers.filter(u => this.userEntityService.isRemoteUser(u)).map(u => {
					const profile = profiles.find(p => p.userId === u.id);
					const url = profile != null ? profile.url : null;
					return {
						uri: u.uri,
						url: url ?? undefined,
						username: u.username,
						host: u.host,
					} as IMentionedRemoteUsers[0];
				}));
			}

			if (data.poll != null && JSON.stringify(data.poll) !== JSON.stringify(oldPoll)) {
				// Start transaction
				await this.db.transaction(async transactionalEntityManager => {
					await transactionalEntityManager.update(MiNote, oldnote.id, note);

					const poll = new MiPoll({
						noteId: note.id,
						choices: data.poll!.choices,
						expiresAt: data.poll!.expiresAt,
						multiple: data.poll!.multiple,
						votes: new Array(data.poll!.choices.length).fill(0),
						noteVisibility: note.visibility,
						userId: user.id,
						userHost: user.host,
					});

					if (!oldnote.hasPoll) {
						await transactionalEntityManager.insert(MiPoll, poll);
					} else {
						await transactionalEntityManager.update(MiPoll, oldnote.id, poll);
					}
				});
			} else {
				await this.notesRepository.update(oldnote.id, note);
			}

			setImmediate('post edited', { signal: this.#shutdownController.signal }).then(
				() => this.postNoteEdited(note, user, data, silent, tags!, mentionedUsers!),
				() => { /* aborted, ignore this */ },
			);

			return note;
		} else {
			return oldnote;
		}
	}

	@bindThis
	private async postNoteEdited(note: MiNote, user: {
		id: MiUser['id'];
		username: MiUser['username'];
		host: MiUser['host'];
		isBot: MiUser['isBot'];
		noindex: MiUser['noindex'];
	}, data: Option, silent: boolean, tags: string[], mentionedUsers: MinimumUser[]) {
		// Register host
		if (this.userEntityService.isRemoteUser(user)) {
			this.federatedInstanceService.fetch(user.host).then(async i => {
				this.instancesRepository.increment({ id: i.id }, 'notesCount', 1);
				if ((await this.metaService.fetch()).enableChartsForFederatedInstances) {
					this.instanceChart.updateNote(i.host, note, true);
				}
			});
		}

		// ハッシュタグ更新
		this.pushToTl(note, user);

		if (data.poll && data.poll.expiresAt) {
			const delay = data.poll.expiresAt.getTime() - Date.now();
			this.queueService.endedPollNotificationQueue.remove(note.id);
			this.queueService.endedPollNotificationQueue.add(note.id, {
				noteId: note.id,
			}, {
				delay,
				removeOnComplete: true,
			});
		}

		if (!silent) {
			if (this.userEntityService.isLocalUser(user)) this.activeUsersChart.write(user);

			// 未読通知を作成
			if (data.visibility === 'specified') {
				if (data.visibleUsers == null) throw new Error('invalid param');

				for (const u of data.visibleUsers) {
					// ローカルユーザーのみ
					if (!this.userEntityService.isLocalUser(u)) continue;

					this.noteReadService.insertNoteUnread(u.id, note, {
						isSpecified: true,
						isMentioned: false,
					});
				}
			} else {
				for (const u of mentionedUsers) {
					// ローカルユーザーのみ
					if (!this.userEntityService.isLocalUser(u)) continue;

					this.noteReadService.insertNoteUnread(u.id, note, {
						isSpecified: false,
						isMentioned: true,
					});
				}
			}

			// Pack the note
			const noteObj = await this.noteEntityService.pack(note, null, { skipHide: true });
			if (data.poll != null) {
				this.globalEventService.publishNoteStream(note.id, 'updated', {
					cw: note.cw,
					text: note.text!,
				});
			} else {
				this.globalEventService.publishNoteStream(note.id, 'updated', {
					cw: note.cw,
					text: note.text!,
				});
			}

			this.roleService.addNoteToRoleTimeline(noteObj);

			this.webhookService.getActiveWebhooks().then(webhooks => {
				webhooks = webhooks.filter(x => x.userId === user.id && x.on.includes('note'));
				for (const webhook of webhooks) {
					this.queueService.webhookDeliver(webhook, 'note', {
						note: noteObj,
					});
				}
			});

			const nm = new NotificationManager(this.mutingsRepository, this.notificationService, user, note);

			await this.createMentionedEvents(mentionedUsers, note, nm);

			// If has in reply to note
			if (data.reply) {
				// 通知
				if (data.reply.userHost === null) {
					const isThreadMuted = await this.noteThreadMutingsRepository.exists({
						where: {
							userId: data.reply.userId,
							threadId: data.reply.threadId ?? data.reply.id,
						},
					});

					const [
						userIdsWhoMeMuting,
					] = data.reply.userId ? await Promise.all([
						this.cacheService.userMutingsCache.fetch(data.reply.userId),
					]) : [new Set<string>()];

					const muted = isUserRelated(note, userIdsWhoMeMuting);

					if (!isThreadMuted && !muted) {
						nm.push(data.reply.userId, 'reply');
						this.globalEventService.publishMainStream(data.reply.userId, 'reply', noteObj);

						const webhooks = (await this.webhookService.getActiveWebhooks()).filter(x => x.userId === data.reply!.userId && x.on.includes('reply'));
						for (const webhook of webhooks) {
							this.queueService.webhookDeliver(webhook, 'reply', {
								note: noteObj,
							});
						}
					}
				}
			}

			// If it is renote
			if (data.renote) {
				const type = this.isQuote(data) ? 'quote' : 'renote';

				// Notify
				if (data.renote.userHost === null) {
					const isThreadMuted = await this.noteThreadMutingsRepository.exists({
						where: {
							userId: data.renote.userId,
							threadId: data.renote.threadId ?? data.renote.id,
						},
					});

					const [
						userIdsWhoMeMuting,
					] = data.renote.userId ? await Promise.all([
						this.cacheService.userMutingsCache.fetch(data.renote.userId),
					]) : [new Set<string>()];

					const muted = isUserRelated(note, userIdsWhoMeMuting);

					if (!isThreadMuted && !muted) {
						nm.push(data.renote.userId, type);
					}
				}

				// Publish event
				if ((user.id !== data.renote.userId) && data.renote.userHost === null) {
					this.globalEventService.publishMainStream(data.renote.userId, 'renote', noteObj);

					const webhooks = (await this.webhookService.getActiveWebhooks()).filter(x => x.userId === data.renote!.userId && x.on.includes('renote'));
					for (const webhook of webhooks) {
						this.queueService.webhookDeliver(webhook, 'renote', {
							note: noteObj,
						});
					}
				}
			}

			nm.notify();

			//#region AP deliver
			if (this.userEntityService.isLocalUser(user)) {
				(async () => {
					const noteActivity = await this.renderNoteOrRenoteActivity(data, note);
					const dm = this.apDeliverManagerService.createDeliverManager(user, noteActivity);

					// メンションされたリモートユーザーに配送
					for (const u of mentionedUsers.filter(u => this.userEntityService.isRemoteUser(u))) {
						dm.addDirectRecipe(u as MiRemoteUser);
					}

					// 投稿がリプライかつ投稿者がローカルユーザーかつリプライ先の投稿の投稿者がリモートユーザーなら配送
					if (data.reply && data.reply.userHost !== null) {
						const u = await this.usersRepository.findOneBy({ id: data.reply.userId });
						if (u && this.userEntityService.isRemoteUser(u)) dm.addDirectRecipe(u);
					}

					// 投稿がRenoteかつ投稿者がローカルユーザーかつRenote元の投稿の投稿者がリモートユーザーなら配送
					if (data.renote && data.renote.userHost !== null) {
						const u = await this.usersRepository.findOneBy({ id: data.renote.userId });
						if (u && this.userEntityService.isRemoteUser(u)) dm.addDirectRecipe(u);
					}

					// フォロワーに配送
					if (['public', 'home', 'followers'].includes(note.visibility)) {
						dm.addFollowersRecipe();
					}

					if (['public'].includes(note.visibility)) {
						this.relayService.deliverToRelays(user, noteActivity);
					}

					trackPromise(dm.execute());
				})();
			}
			//#endregion
		}

		if (data.channel) {
			this.channelsRepository.increment({ id: data.channel.id }, 'notesCount', 1);
			this.channelsRepository.update(data.channel.id, {
				lastNotedAt: new Date(),
			});

			this.notesRepository.countBy({
				userId: user.id,
				channelId: data.channel.id,
			}).then(count => {
				// この処理が行われるのはノート作成後なので、ノートが一つしかなかったら最初の投稿だと判断できる
				// TODO: とはいえノートを削除して何回も投稿すればその分だけインクリメントされる雑さもあるのでどうにかしたい
				if (count === 1) {
					this.channelsRepository.increment({ id: data.channel!.id }, 'usersCount', 1);
				}
			});
		}

		// Register to search database
		if (!user.noindex) this.index(note);
	}

	@bindThis
	private isQuote(note: Option): note is Option & { renote: MiNote } {
		// sync with misc/is-quote.ts
		return !!note.renote && (!!note.text || !!note.cw || (!!note.files && !!note.files.length) || !!note.poll);
	}

	@bindThis
	private async createMentionedEvents(mentionedUsers: MinimumUser[], note: MiNote, nm: NotificationManager) {
		for (const u of mentionedUsers.filter(u => this.userEntityService.isLocalUser(u))) {
			const isThreadMuted = await this.noteThreadMutingsRepository.exists({
				where: {
					userId: u.id,
					threadId: note.threadId ?? note.id,
				},
			});

			const [
				userIdsWhoMeMuting,
			] = u.id ? await Promise.all([
				this.cacheService.userMutingsCache.fetch(u.id),
			]) : [new Set<string>()];

			const muted = isUserRelated(note, userIdsWhoMeMuting);

			if (isThreadMuted || muted) {
				continue;
			}

			const detailPackedNote = await this.noteEntityService.pack(note, u, {
				detail: true,
			});

			this.globalEventService.publishMainStream(u.id, 'mention', detailPackedNote);

			const webhooks = (await this.webhookService.getActiveWebhooks()).filter(x => x.userId === u.id && x.on.includes('mention'));
			for (const webhook of webhooks) {
				this.queueService.webhookDeliver(webhook, 'mention', {
					note: detailPackedNote,
				});
			}

			// Create notification
			nm.push(u.id, 'mention');
		}
	}

	@bindThis
	private async renderNoteOrRenoteActivity(data: Option, note: MiNote) {
		if (data.localOnly) return null;
		const user = await this.usersRepository.findOneBy({ id: note.userId });
		if (user == null) throw new Error('user not found');

		const content = data.renote && !this.isQuote(data)
			? this.apRendererService.renderAnnounce(data.renote.uri ? data.renote.uri : `${this.config.url}/notes/${data.renote.id}`, note)
			: this.apRendererService.renderUpdate(await this.apRendererService.renderUpNote(note, false), user);

		return this.apRendererService.addContext(content);
	}

	@bindThis
	private index(note: MiNote) {
		if (note.text == null && note.cw == null) return;

		this.searchService.indexNote(note);
	}

	@bindThis
	private async extractMentionedUsers(user: { host: MiUser['host']; }, tokens: mfm.MfmNode[]): Promise<MiUser[]> {
		if (tokens == null) return [];

		const mentions = extractMentions(tokens);
		let mentionedUsers = (await Promise.all(mentions.map(m =>
			this.remoteUserResolveService.resolveUser(m.username, m.host ?? user.host).catch(() => null),
		))).filter(x => x != null) as MiUser[];

		// Drop duplicate users
		mentionedUsers = mentionedUsers.filter((u, i, self) =>
			i === self.findIndex(u2 => u.id === u2.id),
		);

		return mentionedUsers;
	}

	@bindThis
	private async pushToTl(note: MiNote, user: { id: MiUser['id']; host: MiUser['host']; }) {
		const meta = await this.metaService.fetch();
		if (!meta.enableFanoutTimeline) return;

		const r = this.redisForTimelines.pipeline();

		if (note.channelId) {
			this.fanoutTimelineService.push(`channelTimeline:${note.channelId}`, note.id, this.config.perChannelMaxNoteCacheCount, r);

			this.fanoutTimelineService.push(`userTimelineWithChannel:${user.id}`, note.id, note.userHost == null ? meta.perLocalUserUserTimelineCacheMax : meta.perRemoteUserUserTimelineCacheMax, r);

			const channelFollowings = await this.channelFollowingsRepository.find({
				where: {
					followeeId: note.channelId,
				},
				select: ['followerId'],
			});

			for (const channelFollowing of channelFollowings) {
				this.fanoutTimelineService.push(`homeTimeline:${channelFollowing.followerId}`, note.id, meta.perUserHomeTimelineCacheMax, r);
				if (note.fileIds.length > 0) {
					this.fanoutTimelineService.push(`homeTimelineWithFiles:${channelFollowing.followerId}`, note.id, meta.perUserHomeTimelineCacheMax / 2, r);
				}
			}
		} else {
			// TODO: キャッシュ？
			// eslint-disable-next-line prefer-const
			let [followings, userListMemberships] = await Promise.all([
				this.followingsRepository.find({
					where: {
						followeeId: user.id,
						followerHost: IsNull(),
						isFollowerHibernated: false,
					},
					select: ['followerId', 'withReplies'],
				}),
				this.userListMembershipsRepository.find({
					where: {
						userId: user.id,
					},
					select: ['userListId', 'userListUserId', 'withReplies'],
				}),
			]);

			if (note.visibility === 'followers') {
				// TODO: 重そうだから何とかしたい Set 使う？
				userListMemberships = userListMemberships.filter(x => x.userListUserId === user.id || followings.some(f => f.followerId === x.userListUserId));
			}

			// TODO: あまりにも数が多いと redisPipeline.exec に失敗する(理由は不明)ため、3万件程度を目安に分割して実行するようにする
			for (const following of followings) {
				// 基本的にvisibleUserIdsには自身のidが含まれている前提であること
				if (note.visibility === 'specified' && !note.visibleUserIds.some(v => v === following.followerId)) continue;

				// 「自分自身への返信 or そのフォロワーへの返信」のどちらでもない場合
				if (isReply(note, following.followerId)) {
					if (!following.withReplies) continue;
				}

				this.fanoutTimelineService.push(`homeTimeline:${following.followerId}`, note.id, meta.perUserHomeTimelineCacheMax, r);
				if (note.fileIds.length > 0) {
					this.fanoutTimelineService.push(`homeTimelineWithFiles:${following.followerId}`, note.id, meta.perUserHomeTimelineCacheMax / 2, r);
				}
			}

			for (const userListMembership of userListMemberships) {
				// ダイレクトのとき、そのリストが対象外のユーザーの場合
				if (
					note.visibility === 'specified' &&
					note.userId !== userListMembership.userListUserId &&
					!note.visibleUserIds.some(v => v === userListMembership.userListUserId)
				) continue;

				// 「自分自身への返信 or そのリストの作成者への返信」のどちらでもない場合
				if (isReply(note, userListMembership.userListUserId)) {
					if (!userListMembership.withReplies) continue;
				}

				this.fanoutTimelineService.push(`userListTimeline:${userListMembership.userListId}`, note.id, meta.perUserListTimelineCacheMax, r);
				if (note.fileIds.length > 0) {
					this.fanoutTimelineService.push(`userListTimelineWithFiles:${userListMembership.userListId}`, note.id, meta.perUserListTimelineCacheMax / 2, r);
				}
			}

			if (note.visibility !== 'specified' || !note.visibleUserIds.some(v => v === user.id)) { // 自分自身のHTL
				this.fanoutTimelineService.push(`homeTimeline:${user.id}`, note.id, meta.perUserHomeTimelineCacheMax, r);
				if (note.fileIds.length > 0) {
					this.fanoutTimelineService.push(`homeTimelineWithFiles:${user.id}`, note.id, meta.perUserHomeTimelineCacheMax / 2, r);
				}
			}

			// 自分自身以外への返信
			if (isReply(note)) {
				this.fanoutTimelineService.push(`userTimelineWithReplies:${user.id}`, note.id, note.userHost == null ? meta.perLocalUserUserTimelineCacheMax : meta.perRemoteUserUserTimelineCacheMax, r);

				if (note.visibility === 'public' && note.userHost == null) {
					this.fanoutTimelineService.push('localTimelineWithReplies', note.id, 300, r);
					if (note.replyUserHost == null) {
						this.fanoutTimelineService.push(`localTimelineWithReplyTo:${note.replyUserId}`, note.id, 300 / 10, r);
					}
				}
			} else {
				this.fanoutTimelineService.push(`userTimeline:${user.id}`, note.id, note.userHost == null ? meta.perLocalUserUserTimelineCacheMax : meta.perRemoteUserUserTimelineCacheMax, r);
				if (note.fileIds.length > 0) {
					this.fanoutTimelineService.push(`userTimelineWithFiles:${user.id}`, note.id, note.userHost == null ? meta.perLocalUserUserTimelineCacheMax / 2 : meta.perRemoteUserUserTimelineCacheMax / 2, r);
				}

				if (note.visibility === 'public' && note.userHost == null) {
					this.fanoutTimelineService.push('localTimeline', note.id, 1000, r);
					if (note.fileIds.length > 0) {
						this.fanoutTimelineService.push('localTimelineWithFiles', note.id, 500, r);
					}
				}
			}

			if (Math.random() < 0.1) {
				process.nextTick(() => {
					this.checkHibernation(followings);
				});
			}
		}

		r.exec();
	}

	@bindThis
	public async checkHibernation(followings: MiFollowing[]) {
		if (followings.length === 0) return;

		const shuffle = (array: MiFollowing[]) => {
			for (let i = array.length - 1; i > 0; i--) {
				const j = Math.floor(Math.random() * (i + 1));
				[array[i], array[j]] = [array[j], array[i]];
			}
			return array;
		};

		// ランダムに最大1000件サンプリング
		const samples = shuffle(followings).slice(0, Math.min(followings.length, 1000));

		const hibernatedUsers = await this.usersRepository.find({
			where: {
				id: In(samples.map(x => x.followerId)),
				lastActiveDate: LessThan(new Date(Date.now() - (1000 * 60 * 60 * 24 * 50))),
			},
			select: ['id'],
		});

		if (hibernatedUsers.length > 0) {
			this.usersRepository.update({
				id: In(hibernatedUsers.map(x => x.id)),
			}, {
				isHibernated: true,
			});

			this.followingsRepository.update({
				followerId: In(hibernatedUsers.map(x => x.id)),
			}, {
				isFollowerHibernated: true,
			});
		}
	}

	@bindThis
	public dispose(): void {
		this.#shutdownController.abort();
	}

	@bindThis
	public onApplicationShutdown(signal?: string | undefined): void {
		this.dispose();
	}
}