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

import ms from 'ms';
import { Inject, Injectable } from '@nestjs/common';
import { Endpoint } from '@/server/api/endpoint-base.js';
import type { FollowingsRepository } from '@/models/_.js';
import { UserEntityService } from '@/core/entities/UserEntityService.js';
import { UserFollowingService } from '@/core/UserFollowingService.js';
import { DI } from '@/di-symbols.js';
import { GetterService } from '@/server/api/GetterService.js';
import { ApiError } from '../../error.js';

export const meta = {
	tags: ['following', 'users'],

	limit: {
		duration: ms('1hour'),
		max: 100,
	},

	requireCredential: true,

	kind: 'write:following',

	errors: {
		noSuchUser: {
			message: 'No such user.',
			code: 'NO_SUCH_USER',
			id: '14318698-f67e-492a-99da-5353a5ac52be',
		},

		followeeIsYourself: {
			message: 'Followee is yourself.',
			code: 'FOLLOWEE_IS_YOURSELF',
			id: '4c4cbaf9-962a-463b-8418-a5e365dbf2eb',
		},

		notFollowing: {
			message: 'You are not following that user.',
			code: 'NOT_FOLLOWING',
			id: 'b8dc75cf-1cb5-46c9-b14b-5f1ffbd782c9',
		},
	},

	res: {
		type: 'object',
		optional: false, nullable: false,
		ref: 'UserLite',
	},
} as const;

export const paramDef = {
	type: 'object',
	properties: {
		userId: { type: 'string', format: 'misskey:id' },
		notify: { type: 'string', enum: ['normal', 'none'] },
		withReplies: { type: 'boolean' },
	},
	required: ['userId'],
} as const;

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

		private userEntityService: UserEntityService,
		private getterService: GetterService,
		private userFollowingService: UserFollowingService,
	) {
		super(meta, paramDef, async (ps, me) => {
			const follower = me;

			// Check if the follower is yourself
			if (me.id === ps.userId) {
				throw new ApiError(meta.errors.followeeIsYourself);
			}

			// Get followee
			const followee = await this.getterService.getUser(ps.userId).catch(err => {
				if (err.id === '15348ddd-432d-49c2-8a5a-8069753becff') throw new ApiError(meta.errors.noSuchUser);
				throw err;
			});

			// Check not following
			const exist = await this.followingsRepository.findOneBy({
				followerId: follower.id,
				followeeId: followee.id,
			});

			if (exist == null) {
				throw new ApiError(meta.errors.notFollowing);
			}

			await this.followingsRepository.update({
				id: exist.id,
			}, {
				notify: ps.notify != null ? (ps.notify === 'none' ? null : ps.notify) : undefined,
				withReplies: ps.withReplies != null ? ps.withReplies : undefined,
			});

			return await this.userEntityService.pack(follower.id, me);
		});
	}
}
