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

import { Inject, Injectable } from '@nestjs/common';
import type { NotesRepository } from '@/models/_.js';
import { Endpoint } from '@/server/api/endpoint-base.js';
import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
import { DI } from '@/di-symbols.js';
import { FeaturedService } from '@/core/FeaturedService.js';

export const meta = {
	tags: ['notes'],

	requireCredential: false,
	allowGet: true,
	cacheSec: 3600,

	res: {
		type: 'array',
		optional: false, nullable: false,
		items: {
			type: 'object',
			optional: false, nullable: false,
			ref: 'Note',
		},
	},
} as const;

export const paramDef = {
	type: 'object',
	properties: {
		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
		untilId: { type: 'string', format: 'misskey:id' },
		channelId: { type: 'string', nullable: true, format: 'misskey:id' },
	},
	required: [],
} as const;

@Injectable()
export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
	private globalNotesRankingCache: string[] = [];
	private globalNotesRankingCacheLastFetchedAt = 0;

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

		private noteEntityService: NoteEntityService,
		private featuredService: FeaturedService,
	) {
		super(meta, paramDef, async (ps, me) => {
			let noteIds: string[];
			if (ps.channelId) {
				noteIds = await this.featuredService.getInChannelNotesRanking(ps.channelId, 50);
			} else {
				if (this.globalNotesRankingCacheLastFetchedAt !== 0 && (Date.now() - this.globalNotesRankingCacheLastFetchedAt < 1000 * 60 * 30)) {
					noteIds = this.globalNotesRankingCache;
				} else {
					noteIds = await this.featuredService.getGlobalNotesRanking(100);
					this.globalNotesRankingCache = noteIds;
					this.globalNotesRankingCacheLastFetchedAt = Date.now();
				}
			}

			if (noteIds.length === 0) {
				return [];
			}

			noteIds.sort((a, b) => a > b ? -1 : 1);
			if (ps.untilId) {
				noteIds = noteIds.filter(id => id < ps.untilId!);
			}
			noteIds = noteIds.slice(0, ps.limit);

			const query = this.notesRepository.createQueryBuilder('note')
				.where('note.id IN (:...noteIds)', { noteIds: noteIds })
				.innerJoinAndSelect('note.user', 'user')
				.leftJoinAndSelect('note.reply', 'reply')
				.leftJoinAndSelect('note.renote', 'renote')
				.leftJoinAndSelect('reply.user', 'replyUser')
				.leftJoinAndSelect('renote.user', 'renoteUser')
				.leftJoinAndSelect('note.channel', 'channel');

			const notes = await query.getMany();
			notes.sort((a, b) => a.id > b.id ? -1 : 1);

			// TODO: ミュート等考慮

			return await this.noteEntityService.packMany(notes, me);
		});
	}
}
