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

import { Inject, Injectable } from '@nestjs/common';
import { DI } from '@/di-symbols.js';
import type { AbuseUserReportsRepository, InstancesRepository, MiInstance, MiUser } from '@/models/_.js';
import { awaitAll } from '@/misc/prelude/await-all.js';
import type { MiAbuseUserReport } from '@/models/AbuseUserReport.js';
import { bindThis } from '@/decorators.js';
import { IdService } from '@/core/IdService.js';
import type { Packed } from '@/misc/json-schema.js';
import { UserEntityService } from './UserEntityService.js';
import { InstanceEntityService } from './InstanceEntityService.js';

@Injectable()
export class AbuseUserReportEntityService {
	constructor(
		@Inject(DI.abuseUserReportsRepository)
		private abuseUserReportsRepository: AbuseUserReportsRepository,

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

		private readonly instanceEntityService: InstanceEntityService,
		private userEntityService: UserEntityService,
		private idService: IdService,
	) {
	}

	@bindThis
	public async pack(
		src: MiAbuseUserReport['id'] | MiAbuseUserReport,
		hint?: {
			packedReporter?: Packed<'UserDetailedNotMe'>,
			packedTargetUser?: Packed<'UserDetailedNotMe'>,
			packedTargetInstance?: Packed<'FederationInstance'>,
			packedAssignee?: Packed<'UserDetailedNotMe'>,
		},
		me?: MiUser | null,
	) {
		const report = typeof src === 'object' ? src : await this.abuseUserReportsRepository.findOneByOrFail({ id: src });

		// noinspection ES6MissingAwait
		return await awaitAll({
			id: report.id,
			createdAt: this.idService.parse(report.id).date.toISOString(),
			comment: report.comment,
			resolved: report.resolved,
			reporterId: report.reporterId,
			targetUserId: report.targetUserId,
			assigneeId: report.assigneeId,
			reporter: hint?.packedReporter ?? this.userEntityService.pack(report.reporter ?? report.reporterId, me, {
				schema: 'UserDetailedNotMe',
			}),
			targetUser: hint?.packedTargetUser ?? this.userEntityService.pack(report.targetUser ?? report.targetUserId, me, {
				schema: 'UserDetailedNotMe',
			}),
			// return hint, or pack by relation, or fetch and pack by id, or null
			targetInstance: hint?.packedTargetInstance ?? (
				report.targetUserInstance
					? this.instanceEntityService.pack(report.targetUserInstance, me)
					: report.targetUserHost
						? this.instancesRepository.findOneBy({ host: report.targetUserHost }).then(instance => instance
							? this.instanceEntityService.pack(instance, me)
							: null)
						: null),
			assignee: report.assigneeId ? hint?.packedAssignee ?? this.userEntityService.pack(report.assignee ?? report.assigneeId, me, {
				schema: 'UserDetailedNotMe',
			}) : null,
			forwarded: report.forwarded,
			resolvedAs: report.resolvedAs,
			moderationNote: report.moderationNote,
		});
	}

	@bindThis
	public async packMany(
		reports: MiAbuseUserReport[],
		me?: MiUser | null,
	) {
		const _reporters = reports.map(({ reporter, reporterId }) => reporter ?? reporterId);
		const _targetUsers = reports.map(({ targetUser, targetUserId }) => targetUser ?? targetUserId);
		const _assignees = reports.map(({ assignee, assigneeId }) => assignee ?? assigneeId).filter(x => x != null);
		const _userMap = await this.userEntityService.packMany(
			[..._reporters, ..._targetUsers, ..._assignees],
			me,
			{ schema: 'UserDetailedNotMe' },
		).then(users => new Map(users.map(u => [u.id, u])));
		const _targetInstances = reports
			.map(({ targetUserInstance, targetUserHost }) => targetUserInstance ?? targetUserHost)
			.filter((i): i is MiInstance | string => i != null);
		const _instanceMap = await this.instanceEntityService.packMany(await this.instanceEntityService.fetchInstancesByHost(_targetInstances), me)
			.then(instances => new Map(instances.map(i => [i.host, i])));
		return Promise.all(
			reports.map(report => {
				const packedReporter = _userMap.get(report.reporterId);
				const packedTargetUser = _userMap.get(report.targetUserId);
				const packedTargetInstance = report.targetUserHost ? _instanceMap.get(report.targetUserHost) : undefined;
				const packedAssignee = report.assigneeId != null ? _userMap.get(report.assigneeId) : undefined;
				return this.pack(report, { packedReporter, packedTargetUser, packedAssignee, packedTargetInstance }, me);
			}),
		);
	}
}