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

import { Injectable, Inject } from '@nestjs/common';
import { Not, IsNull, Like, DataSource } from 'typeorm';
import type { MiUser } from '@/models/User.js';
import { AppLockService } from '@/core/AppLockService.js';
import { DI } from '@/di-symbols.js';
import { UserEntityService } from '@/core/entities/UserEntityService.js';
import type { UsersRepository } from '@/models/_.js';
import { bindThis } from '@/decorators.js';
import Chart from '../core.js';
import { ChartLoggerService } from '../ChartLoggerService.js';
import { name, schema } from './entities/users.js';
import type { KVs } from '../core.js';

/**
 * ユーザー数に関するチャート
 */
@Injectable()
export default class UsersChart extends Chart<typeof schema> { // eslint-disable-line import/no-default-export
	constructor(
		@Inject(DI.db)
		private db: DataSource,

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

		private appLockService: AppLockService,
		private userEntityService: UserEntityService,
		private chartLoggerService: ChartLoggerService,
	) {
		super(db, (k) => appLockService.getChartInsertLock(k), chartLoggerService.logger, name, schema);
	}

	protected async tickMajor(): Promise<Partial<KVs<typeof schema>>> {
		const [localCount, remoteCount] = await Promise.all([
			// that Not(Like()) is ugly, but it matches the logic in
			// packages/backend/src/models/User.ts to not count "system"
			// accounts
			this.usersRepository.countBy({ host: IsNull(), username: Not(Like('%.%')) }),
			this.usersRepository.countBy({ host: Not(IsNull()) }),
		]);

		return {
			'local.total': localCount,
			'remote.total': remoteCount,
		};
	}

	protected async tickMinor(): Promise<Partial<KVs<typeof schema>>> {
		return {};
	}

	@bindThis
	public async update(user: { id: MiUser['id'], host: MiUser['host'] }, isAdditional: boolean): Promise<void> {
		const prefix = this.userEntityService.isLocalUser(user) ? 'local' : 'remote';

		await this.commit({
			[`${prefix}.total`]: isAdditional ? 1 : -1,
			[`${prefix}.inc`]: isAdditional ? 1 : 0,
			[`${prefix}.dec`]: isAdditional ? 0 : 1,
		});
	}
}