import { Inject, Injectable } from '@nestjs/common';
import ms from 'ms';
import { Endpoint } from '@/server/api/endpoint-base.js';
import type { BlockingsRepository, UserGroupJoiningsRepository, DriveFilesRepository, UserGroupsRepository } from '@/models/index.js';
import type { User } from '@/models/entities/User.js';
import type { UserGroup } from '@/models/entities/UserGroup.js';
import { GetterService } from '@/server/api/GetterService.js';
import { MessagingService } from '@/core/MessagingService.js';
import { DI } from '@/di-symbols.js';
import { ApiError } from '../../../error.js';

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

	requireCredential: true,

	kind: 'write:messaging',

	limit: {
		duration: ms('1hour'),
		max: 120,
	},

	res: {
		type: 'object',
		optional: false, nullable: false,
		ref: 'MessagingMessage',
	},

	errors: {
		recipientIsYourself: {
			message: 'You can not send a message to yourself.',
			code: 'RECIPIENT_IS_YOURSELF',
			id: '17e2ba79-e22a-4cbc-bf91-d327643f4a7e',
		},

		noSuchUser: {
			message: 'No such user.',
			code: 'NO_SUCH_USER',
			id: '11795c64-40ea-4198-b06e-3c873ed9039d',
		},

		noSuchGroup: {
			message: 'No such group.',
			code: 'NO_SUCH_GROUP',
			id: 'c94e2a5d-06aa-4914-8fa6-6a42e73d6537',
		},

		groupAccessDenied: {
			message: 'You can not send messages to groups that you have not joined.',
			code: 'GROUP_ACCESS_DENIED',
			id: 'd96b3cca-5ad1-438b-ad8b-02f931308fbd',
		},

		noSuchFile: {
			message: 'No such file.',
			code: 'NO_SUCH_FILE',
			id: '4372b8e2-185d-4146-8749-2f68864a3e5f',
		},

		contentRequired: {
			message: 'Content required. You need to set text or fileId.',
			code: 'CONTENT_REQUIRED',
			id: '25587321-b0e6-449c-9239-f8925092942c',
		},

		youHaveBeenBlocked: {
			message: 'You cannot send a message because you have been blocked by this user.',
			code: 'YOU_HAVE_BEEN_BLOCKED',
			id: 'c15a5199-7422-4968-941a-2a462c478f7d',
		},
	},
} as const;

export const paramDef = {
	type: 'object',
	properties: {
		text: { type: 'string', nullable: true, maxLength: 3000 },
		fileId: { type: 'string', format: 'misskey:id' },
	},
	anyOf: [
		{
			properties: {
				userId: { type: 'string', format: 'misskey:id' },
			},
			required: ['userId'],
		},
		{
			properties: {
				groupId: { type: 'string', format: 'misskey:id' },
			},
			required: ['groupId'],
		},
	],
} as const;

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

		@Inject(DI.userGroupJoiningsRepository)
		private userGroupJoiningsRepository: UserGroupJoiningsRepository,

		@Inject(DI.blockingsRepository)
		private blockingsRepository: BlockingsRepository,

		@Inject(DI.driveFilesRepository)
		private driveFilesRepository: DriveFilesRepository,

		private getterService: GetterService,
		private messagingService: MessagingService,
	) {
		super(meta, paramDef, async (ps, me) => {
			let recipientUser: User | null;
			let recipientGroup: UserGroup | null;

			if (ps.userId != null) {
				// Myself
				if (ps.userId === me.id) {
					throw new ApiError(meta.errors.recipientIsYourself);
				}

				// Fetch recipient (user)
				recipientUser = 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 blocking
				const block = await this.blockingsRepository.findOneBy({
					blockerId: recipientUser.id,
					blockeeId: me.id,
				});
				if (block) {
					throw new ApiError(meta.errors.youHaveBeenBlocked);
				}
			} else if (ps.groupId != null) {
				// Fetch recipient (group)
				recipientGroup = await this.userGroupsRepository.findOneBy({ id: ps.groupId! });

				if (recipientGroup == null) {
					throw new ApiError(meta.errors.noSuchGroup);
				}

				// check joined
				const joining = await this.userGroupJoiningsRepository.findOneBy({
					userId: me.id,
					userGroupId: recipientGroup.id,
				});

				if (joining == null) {
					throw new ApiError(meta.errors.groupAccessDenied);
				}
			}

			let file = null;
			if (ps.fileId != null) {
				file = await this.driveFilesRepository.findOneBy({
					id: ps.fileId,
					userId: me.id,
				});

				if (file == null) {
					throw new ApiError(meta.errors.noSuchFile);
				}
			}

			// テキストが無いかつ添付ファイルも無かったらエラー
			if (ps.text == null && file == null) {
				throw new ApiError(meta.errors.contentRequired);
			}

			return await this.messagingService.createMessage(me, recipientUser, recipientGroup, ps.text, file);
		});
	}
}
