import {
    AccountsHostname,
    DashboardHostname,
    DisableSignup,
    HomeHostname,
    HttpProtocol,
    IsSaaSService,
} from 'CommonServer/Config';
import Express, {
    ExpressRequest,
    ExpressResponse,
    ExpressRouter,
} from 'CommonServer/utils/Express';
import BadRequestException from 'Common/Types/Exception/BadRequestException';
import { JSONObject } from 'Common/Types/JSON';
import User from 'Common/Models/User';
import Service from 'CommonServer/Services/Index';
import EmailVerificationTokenServiceType from 'CommonServer/Services/EmailVerificationTokenService';
import UserServiceType from 'CommonServer/Services/UserService';
import ObjectID from 'Common/Types/ObjectID';
import EmailVerificationToken from 'Common/Models/EmailVerificationToken';
import BadDataException from 'Common/Types/Exception/BadDataException';
import MailServiceType from 'CommonServer/Services/MailService';
import EmailTemplateType from 'Common/Types/Email/EmailTemplateType';
import EmailSubjects from 'Common/Types/Email/EmailSubjects';
import URL from 'Common/Types/API/URL';
import Response from 'CommonServer/Utils/Response';
import JSONWebToken from 'CommonServer/Utils/JsonWebToken';
import OneUptimeDate from 'Common/Types/Date';
import PositiveNumber from 'Common/Types/PositiveNumber';

const UserService: UserServiceType = Service.UserService;
const EmailVerificationTokenService: EmailVerificationTokenServiceType =
    Service.EmailVerificationTokenService;
const MailService: MailServiceType = Service.MailService;

const router: ExpressRouter = Express.getRouter();

router.post(
    '/signup',
    async (req: ExpressRequest, res: ExpressResponse): Promise<void> => {
        if (DisableSignup) {
            throw new BadRequestException('Sign up is disabled.');
        }

        const data: JSONObject = req.body;
        const user: User = User.asPublicCreateable<User>(
            data['user'] as JSONObject
        );

        if (IsSaaSService) {
            //ALERT: Delete data.role so user don't accidently sign up as master-admin from the API.
            user.isMasterAdmin = false;
            user.isEmailVerified = false;
        }

        let verificationToken: ObjectID | null = null;
        let emailVerificationToken: EmailVerificationToken | null = null;
        if (req.query['token']) {
            verificationToken = new ObjectID(req.query['token'] as string);
            emailVerificationToken =
                await EmailVerificationTokenService.findOneBy({
                    query: {
                        token: verificationToken,
                    },
                });
        }

        const alreadySavedUser: User | null = await UserService.findOneBy({
            query: { email: user.email },
            select: {
                _id: true,
                password: true,
            },
        });

        if (
            emailVerificationToken &&
            user &&
            user.id.toString() === emailVerificationToken.userId.toString()
        ) {
            user.isEmailVerified = true;
        }

        if (alreadySavedUser && alreadySavedUser.password) {
            throw new BadDataException(
                `User with email ${user.email} already exists.`
            );
        }

        let savedUser: User | null = null;
        if (alreadySavedUser) {
            savedUser = await UserService.updateOneByIdAndFetch({
                id: alreadySavedUser.id,
                data: user,
            });
        } else {
            savedUser = await UserService.create({ data: user });
        }

        if (alreadySavedUser) {
            // Send Welcome Mail
            MailService.sendMail(
                user.email,
                EmailSubjects.getSubjectByType(
                    EmailTemplateType.SIGNUP_WELCOME_EMAIL
                ),
                EmailTemplateType.SIGNUP_WELCOME_EMAIL,
                {
                    name: user.name.toString(),
                    dashboardUrl: new URL(
                        HttpProtocol,
                        DashboardHostname
                    ).toString(),
                    homeUrl: new URL(HttpProtocol, HomeHostname).toString(),
                }
            );
        } else {
            // Send EmailVerification Link because this is a new user.
            MailService.sendMail(
                user.email,
                EmailSubjects.getSubjectByType(
                    EmailTemplateType.SIGNUP_WELCOME_EMAIL
                ),
                EmailTemplateType.SIGNUP_WELCOME_EMAIL,
                {
                    name: user.name.toString(),
                    emailVerificationUrl: new URL(
                        HttpProtocol,
                        AccountsHostname
                    ).toString(),
                    homeUrl: new URL(HttpProtocol, HomeHostname).toString(),
                }
            );
        }

        if (savedUser) {
            const token: string = JSONWebToken.sign(
                {
                    userId: savedUser?.id,
                    email: savedUser?.email,
                    isMasterAdmin: savedUser?.isMasterAdmin,
                    roles: [],
                },
                OneUptimeDate.getSomeDaysAfter(new PositiveNumber(30))
            );

            return Response.sendItemResponse(req, res, { token: token });
        }

        throw new BadRequestException('Failed to create a user');
    }
);

export default router;