import { Inject, Injectable } from '@nestjs/common';
import type { UsersRepository } from '@/models/index.js';
import { Endpoint } from '@/server/api/endpoint-base.js';
import { DI } from '@/di-symbols.js';
import { UserEntityService } from '@/core/entities/UserEntityService.js';
import { sqlLikeEscape } from '@/misc/sql-like-escape.js';
import { RoleService } from '@/core/RoleService.js';

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

	requireCredential: true,
	requireModerator: true,

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

export const paramDef = {
	type: 'object',
	properties: {
		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
		offset: { type: 'integer', default: 0 },
		sort: { type: 'string', enum: ['+follower', '-follower', '+createdAt', '-createdAt', '+updatedAt', '-updatedAt', '+lastActiveDate', '-lastActiveDate'] },
		state: { type: 'string', enum: ['all', 'alive', 'available', 'admin', 'moderator', 'adminOrModerator', 'suspended'], default: 'all' },
		origin: { type: 'string', enum: ['combined', 'local', 'remote'], default: 'combined' },
		username: { type: 'string', nullable: true, default: null },
		hostname: {
			type: 'string',
			nullable: true,
			default: null,
			description: 'The local host is represented with `null`.',
		},
	},
	required: [],
} as const;

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

		private userEntityService: UserEntityService,
		private roleService: RoleService,
	) {
		super(meta, paramDef, async (ps, me) => {
			const query = this.usersRepository.createQueryBuilder('user');

			switch (ps.state) {
				case 'available': query.where('user.isSuspended = FALSE'); break;
				case 'alive': query.where('user.updatedAt > :date', { date: new Date(Date.now() - 1000 * 60 * 60 * 24 * 5) }); break;
				case 'suspended': query.where('user.isSuspended = TRUE'); break;
				case 'admin': {
					const adminIds = await this.roleService.getAdministratorIds();
					if (adminIds.length === 0) return [];
					query.where('user.id IN (:...adminIds)', { adminIds: adminIds });
					break;
				}
				case 'moderator': {
					const moderatorIds = await this.roleService.getModeratorIds(false);
					if (moderatorIds.length === 0) return [];
					query.where('user.id IN (:...moderatorIds)', { moderatorIds: moderatorIds });
					break;
				}
				case 'adminOrModerator': {
					const adminOrModeratorIds = await this.roleService.getModeratorIds();
					if (adminOrModeratorIds.length === 0) return [];
					query.where('user.id IN (:...adminOrModeratorIds)', { adminOrModeratorIds: adminOrModeratorIds });
					break;
				}
			}

			switch (ps.origin) {
				case 'local': query.andWhere('user.host IS NULL'); break;
				case 'remote': query.andWhere('user.host IS NOT NULL'); break;
			}

			if (ps.username) {
				query.andWhere('user.usernameLower like :username', { username: sqlLikeEscape(ps.username.toLowerCase()) + '%' });
			}

			if (ps.hostname) {
				query.andWhere('user.host = :hostname', { hostname: ps.hostname.toLowerCase() });
			}

			switch (ps.sort) {
				case '+follower': query.orderBy('user.followersCount', 'DESC'); break;
				case '-follower': query.orderBy('user.followersCount', 'ASC'); break;
				case '+createdAt': query.orderBy('user.createdAt', 'DESC'); break;
				case '-createdAt': query.orderBy('user.createdAt', 'ASC'); break;
				case '+updatedAt': query.orderBy('user.updatedAt', 'DESC', 'NULLS LAST'); break;
				case '-updatedAt': query.orderBy('user.updatedAt', 'ASC', 'NULLS FIRST'); break;
				case '+lastActiveDate': query.orderBy('user.lastActiveDate', 'DESC', 'NULLS LAST'); break;
				case '-lastActiveDate': query.orderBy('user.lastActiveDate', 'ASC', 'NULLS FIRST'); break;
				default: query.orderBy('user.id', 'ASC'); break;
			}

			query.limit(ps.limit);
			query.offset(ps.offset);

			const users = await query.getMany();

			return await this.userEntityService.packMany(users, me, { detail: true });
		});
	}
}