import { Inject, Injectable } from '@nestjs/common';
import type { UserListsRepository, UserListJoiningsRepository, BlockingsRepository } from '@/models/index.js';
import { IdService } from '@/core/IdService.js';
import type { UserList } from '@/models/entities/UserList.js';
import { Endpoint } from '@/server/api/endpoint-base.js';
import { GetterService } from '@/server/api/GetterService.js';
import { UserListEntityService } from '@/core/entities/UserListEntityService.js';
import { DI } from '@/di-symbols.js';
import { ApiError } from '@/server/api/error.js';
import { RoleService } from '@/core/RoleService.js';
import { UserListService } from '@/core/UserListService.js';

export const meta = {
	requireCredential: true,
	prohibitMoved: true,
	res: {
		type: 'object',
		optional: false, nullable: false,
		ref: 'UserList',
	},

	errors: {
		tooManyUserLists: {
			message: 'You cannot create user list any more.',
			code: 'TOO_MANY_USERLISTS',
			id: 'e9c105b2-c595-47de-97fb-7f7c2c33e92f',
		},
		noSuchList: {
			message: 'No such list.',
			code: 'NO_SUCH_LIST',
			id: '9292f798-6175-4f7d-93f4-b6742279667d',
		},
		noSuchUser: {
			message: 'No such user.',
			code: 'NO_SUCH_USER',
			id: '13c457db-a8cb-4d88-b70a-211ceeeabb5f',
		},

		alreadyAdded: {
			message: 'That user has already been added to that list.',
			code: 'ALREADY_ADDED',
			id: 'c3ad6fdb-692b-47ee-a455-7bd12c7af615',
		},

		youHaveBeenBlocked: {
			message: 'You cannot push this user because you have been blocked by this user.',
			code: 'YOU_HAVE_BEEN_BLOCKED',
			id: 'a2497f2a-2389-439c-8626-5298540530f4',
		},

		tooManyUsers: {
			message: 'You can not push users any more.',
			code: 'TOO_MANY_USERS',
			id: '1845ea77-38d1-426e-8e4e-8b83b24f5bd7',
		},
	},
} as const;

export const paramDef = {
	type: 'object',
	properties: {
		name: { type: 'string', minLength: 1, maxLength: 100 },
		listId: { type: 'string', format: 'misskey:id' },
	},
	required: ['name', 'listId'],
} as const;

@Injectable()
export default class extends Endpoint<typeof meta, typeof paramDef> {
	constructor(
		@Inject(DI.userListsRepository)
		private userListsRepository: UserListsRepository,

		@Inject(DI.userListJoiningsRepository)
		private userListJoiningsRepository: UserListJoiningsRepository,

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

		private userListService: UserListService,
		private userListEntityService: UserListEntityService,
		private idService: IdService,
		private getterService: GetterService,
		private roleService: RoleService,
	) {
		super(meta, paramDef, async (ps, me) => {
			const list = await this.userListsRepository.findOneBy({
				id: ps.listId,
				isPublic: true,
			});
			if (list === null) throw new ApiError(meta.errors.noSuchList);
			const currentCount = await this.userListsRepository.countBy({
				userId: me.id,
			});
			if (currentCount > (await this.roleService.getUserPolicies(me.id)).userListLimit) {
				throw new ApiError(meta.errors.tooManyUserLists);
			}

			const userList = await this.userListsRepository.insert({
				id: this.idService.genId(),
				createdAt: new Date(),
				userId: me.id,
				name: ps.name,
			} as UserList).then(x => this.userListsRepository.findOneByOrFail(x.identifiers[0]));

			const users = (await this.userListJoiningsRepository.findBy({
				userListId: ps.listId,
			})).map(x => x.userId);

			for (const user of users) {
				const currentUser = await this.getterService.getUser(user).catch(err => {
					if (err.id === '15348ddd-432d-49c2-8a5a-8069753becff') throw new ApiError(meta.errors.noSuchUser);
					throw err;
				});

				if (currentUser.id !== me.id) {
					const block = await this.blockingsRepository.findOneBy({
						blockerId: currentUser.id,
						blockeeId: me.id,
					});
					if (block) {
						throw new ApiError(meta.errors.youHaveBeenBlocked);
					}
				}

				const exist = await this.userListJoiningsRepository.findOneBy({
					userListId: userList.id,
					userId: currentUser.id,
				});

				if (exist) {
					throw new ApiError(meta.errors.alreadyAdded);
				}

				try {
					await this.userListService.push(currentUser, userList, me);
				} catch (err) {
					if (err instanceof UserListService.TooManyUsersError) {
						throw new ApiError(meta.errors.tooManyUsers);
					}
					throw err;
				}
			}
			return await this.userListEntityService.pack(userList);
		});
	}
}