import type { IUser } from '@rocket.chat/core-typings';
import type { ServerMethods } from '@rocket.chat/ddp-client';
import { Users } from '@rocket.chat/models';
import { Accounts } from 'meteor/accounts-base';
import { Match, check } from 'meteor/check';
import { DDPRateLimiter } from 'meteor/ddp-rate-limiter';
import { Meteor } from 'meteor/meteor';

import { trim } from '../../../lib/utils/stringUtils';
import { RateLimiterClass as RateLimiter } from '../../lib/RateLimiter';
import { passwordPolicy } from '../../lib/auth/passwordPolicy';
import { validateInviteToken } from '../../lib/rooms/invites/validateInviteToken';
import { validateEmailDomain } from '../../lib/validateEmailDomain';
import { settings } from '../../settings';

declare module '@rocket.chat/ddp-client' {
	// eslint-disable-next-line @typescript-eslint/naming-convention
	interface ServerMethods {
		registerUser(
			formData:
				{ email: string; pass: string; username: IUser['username']; name?: string; secretURL?: string; reason?: string } | { email?: null },
		):
			| {
					token: string;
					when: Date;
			  }
			| string;
	}
}

export const registerUser = async (
	formData:
		{ email: string; pass: string; username: IUser['username']; name?: string; secretURL?: string; reason?: string } | { email?: null },
): Promise<
	| {
			token: string;
			when: Date;
	  }
	| string
> => {
	const AllowAnonymousRead = settings.get<boolean>('Accounts_AllowAnonymousRead');
	const AllowAnonymousWrite = settings.get<boolean>('Accounts_AllowAnonymousWrite');
	const manuallyApproveNewUsers = settings.get<boolean>('Accounts_ManuallyApproveNewUsers');
	if (AllowAnonymousRead === true && AllowAnonymousWrite === true && !formData.email) {
		const userId = await Accounts.insertUserDoc(
			{},
			{
				globalRoles: ['anonymous'],
				active: true,
			},
		);

		const stampedLoginToken = await Accounts._generateStampedLoginToken();

		await Accounts._insertLoginToken(userId, stampedLoginToken);
		return stampedLoginToken;
	}
	check(
		formData,
		Match.ObjectIncluding({
			email: String,
			pass: String,
			name: String,
			secretURL: Match.Optional(String),
			reason: Match.Optional(String),
		}),
	);

	if (settings.get('Accounts_RegistrationForm') === 'Disabled') {
		throw new Meteor.Error('error-user-registration-disabled', 'User registration is disabled', {
			method: 'registerUser',
		});
	}

	if (
		settings.get('Accounts_RegistrationForm') === 'Secret URL' &&
		(!formData.secretURL || formData.secretURL !== settings.get('Accounts_RegistrationForm_SecretURL'))
	) {
		if (!formData.secretURL) {
			throw new Meteor.Error('error-user-registration-secret', 'User registration is only allowed via Secret URL', {
				method: 'registerUser',
			});
		}

		try {
			await validateInviteToken(formData.secretURL);
		} catch (e) {
			throw new Meteor.Error('error-user-registration-secret', 'User registration is only allowed via Secret URL', {
				method: 'registerUser',
			});
		}
	}

	passwordPolicy.validate(formData.pass);

	await validateEmailDomain(formData.email);

	const userData = {
		email: trim(formData.email.toLowerCase()),
		password: formData.pass,
		...(formData.name?.trim() && { name: formData.name?.trim() }),
		reason: formData.reason,
	};

	let userId;
	try {
		userId = await Accounts.createUserAsync(userData);
	} catch (e) {
		if (e instanceof Meteor.Error) {
			throw e;
		}

		if (e instanceof Error) {
			throw new Meteor.Error(e.message);
		}

		throw new Meteor.Error(String(e));
	}

	const reason = trim(formData.reason);
	if (manuallyApproveNewUsers && reason) {
		await Users.setReason(userId, reason);
	}

	try {
		Accounts.sendVerificationEmail(userId, userData.email);
	} catch (error) {
		// throw new Meteor.Error 'error-email-send-failed', 'Error trying to send email: ' + error.message, { method: 'registerUser', message: error.message }
	}

	return userId;
};

Meteor.methods<ServerMethods>({
	async registerUser(formData) {
		return registerUser(formData);
	},
});

let registerUserRuleId = RateLimiter.limitMethod(
	'registerUser',
	settings.get('Rate_Limiter_Limit_RegisterUser'),
	settings.get('API_Enable_Rate_Limiter_Limit_Time_Default'),
	{
		userId() {
			return true;
		},
	},
);

settings.watch('Rate_Limiter_Limit_RegisterUser', (value) => {
	// When running on testMode, there's no rate limiting added, so this function throws an error
	if (process.env.TEST_MODE === 'true' || process.env.TEST_MODE === 'api') {
		return;
	}

	if (!registerUserRuleId) {
		throw new Error('Rate limiter rule for "registerUser" not found');
	}
	// remove old DDP rate limiter rule and create a new one with the updated setting value
	DDPRateLimiter.removeRule(registerUserRuleId);
	registerUserRuleId = RateLimiter.limitMethod('registerUser', value, settings.get('API_Enable_Rate_Limiter_Limit_Time_Default'), {
		userId() {
			return true;
		},
	});
});