/*
 * 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 { GalleryLikesRepository, GalleryPostsRepository } from '@/models/_.js';
import { awaitAll } from '@/misc/prelude/await-all.js';
import type { Packed } from '@/misc/json-schema.js';
import type { } from '@/models/Blocking.js';
import type { MiUser } from '@/models/User.js';
import type { MiGalleryPost } from '@/models/GalleryPost.js';
import { bindThis } from '@/decorators.js';
import { IdService } from '@/core/IdService.js';
import { UserEntityService } from './UserEntityService.js';
import { DriveFileEntityService } from './DriveFileEntityService.js';

@Injectable()
export class GalleryPostEntityService {
	constructor(
		@Inject(DI.galleryPostsRepository)
		private galleryPostsRepository: GalleryPostsRepository,

		@Inject(DI.galleryLikesRepository)
		private galleryLikesRepository: GalleryLikesRepository,

		private userEntityService: UserEntityService,
		private driveFileEntityService: DriveFileEntityService,
		private idService: IdService,
	) {
	}

	@bindThis
	public async pack(
		src: MiGalleryPost['id'] | MiGalleryPost,
		me?: { id: MiUser['id'] } | null | undefined,
		hint?: {
			packedUser?: Packed<'UserLite'>
		},
	): Promise<Packed<'GalleryPost'>> {
		const meId = me ? me.id : null;
		const post = typeof src === 'object' ? src : await this.galleryPostsRepository.findOneByOrFail({ id: src });

		return await awaitAll({
			id: post.id,
			createdAt: this.idService.parse(post.id).date.toISOString(),
			updatedAt: post.updatedAt.toISOString(),
			userId: post.userId,
			user: hint?.packedUser ?? this.userEntityService.pack(post.user ?? post.userId, me),
			title: post.title,
			description: post.description,
			fileIds: post.fileIds,
			// TODO: packMany causes N+1 queries
			files: this.driveFileEntityService.packManyByIds(post.fileIds),
			tags: post.tags.length > 0 ? post.tags : undefined,
			isSensitive: post.isSensitive,
			likedCount: post.likedCount,
			isLiked: meId ? await this.galleryLikesRepository.exists({ where: { postId: post.id, userId: meId } }) : undefined,
		});
	}

	@bindThis
	public async packMany(
		posts: MiGalleryPost[],
		me?: { id: MiUser['id'] } | null | undefined,
	) {
		const _users = posts.map(({ user, userId }) => user ?? userId);
		const _userMap = await this.userEntityService.packMany(_users, me)
			.then(users => new Map(users.map(u => [u.id, u])));
		return Promise.all(posts.map(post => this.pack(post, me, { packedUser: _userMap.get(post.userId) })));
	}
}