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

import { Inject, Injectable } from '@nestjs/common';
import { Brackets } from 'typeorm';
import { Endpoint } from '@/server/api/endpoint-base.js';
import { QueryService } from '@/core/QueryService.js';
import type { ChannelsRepository } from '@/models/_.js';
import { ChannelEntityService } from '@/core/entities/ChannelEntityService.js';
import { DI } from '@/di-symbols.js';
import { sqlLikeEscape } from '@/misc/sql-like-escape.js';

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

	requireCredential: false,

	res: {
		type: 'array',
		optional: false, nullable: false,
		items: {
			type: 'object',
			optional: false, nullable: false,
			ref: 'Channel',
		},
	},

	// 3 calls per second
	limit: {
		duration: 1000,
		max: 3,
	},
} as const;

export const paramDef = {
	type: 'object',
	properties: {
		query: { type: 'string' },
		type: { type: 'string', enum: ['nameAndDescription', 'nameOnly'], default: 'nameAndDescription' },
		sinceId: { type: 'string', format: 'misskey:id' },
		untilId: { type: 'string', format: 'misskey:id' },
		limit: { type: 'integer', minimum: 1, maximum: 100, default: 5 },
	},
	required: ['query'],
} as const;

@Injectable()
export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
	constructor(
		@Inject(DI.channelsRepository)
		private channelsRepository: ChannelsRepository,

		private channelEntityService: ChannelEntityService,
		private queryService: QueryService,
	) {
		super(meta, paramDef, async (ps, me) => {
			const query = this.queryService.makePaginationQuery(this.channelsRepository.createQueryBuilder('channel'), ps.sinceId, ps.untilId)
				.andWhere('channel.isArchived = FALSE');

			if (ps.query !== '') {
				if (ps.type === 'nameAndDescription') {
					query.andWhere(new Brackets(qb => {
						qb
							.where('channel.name ILIKE :q', { q: `%${ sqlLikeEscape(ps.query) }%` })
							.orWhere('channel.description ILIKE :q', { q: `%${ sqlLikeEscape(ps.query) }%` });
					}));
				} else {
					query.andWhere('channel.name ILIKE :q', { q: `%${ sqlLikeEscape(ps.query) }%` });
				}
			}

			const channels = await query
				.limit(ps.limit)
				.getMany();

			return await Promise.all(channels.map(x => this.channelEntityService.pack(x, me)));
		});
	}
}
