import { Request, Response, Router } from "express";
import {
	Config,
	generateToken,
	Invite,
	FieldErrors,
	User,
	adjustEmail,
	RegisterSchema,
} from "@fosscord/util";
import {
	route,
	getIpAdress,
	IPAnalysis,
	isProxy,
	verifyCaptcha,
} from "@fosscord/api";
import bcrypt from "bcrypt";
import { HTTPError } from "lambert-server";

const router: Router = Router();

router.post(
	"/",
	route({ body: "RegisterSchema" }),
	async (req: Request, res: Response) => {
		const body = req.body as RegisterSchema;
		const { register, security } = Config.get();
		const ip = getIpAdress(req);

		// email will be slightly modified version of the user supplied email -> e.g. protection against GMail Trick
		let email = adjustEmail(body.email);

		// check if registration is allowed
		if (!register.allowNewRegistration) {
			throw FieldErrors({
				email: {
					code: "REGISTRATION_DISABLED",
					message: req.t("auth:register.REGISTRATION_DISABLED"),
				},
			});
		}

		// check if the user agreed to the Terms of Service
		if (!body.consent) {
			throw FieldErrors({
				consent: {
					code: "CONSENT_REQUIRED",
					message: req.t("auth:register.CONSENT_REQUIRED"),
				},
			});
		}

		if (register.disabled) {
			throw FieldErrors({
				email: {
					code: "DISABLED",
					message: "registration is disabled on this instance",
				},
			});
		}

		if (register.requireCaptcha && security.captcha.enabled) {
			const { sitekey, service } = security.captcha;
			if (!body.captcha_key) {
				return res?.status(400).json({
					captcha_key: ["captcha-required"],
					captcha_sitekey: sitekey,
					captcha_service: service,
				});
			}

			const verify = await verifyCaptcha(body.captcha_key, ip);
			if (!verify.success) {
				return res.status(400).json({
					captcha_key: verify["error-codes"],
					captcha_sitekey: sitekey,
					captcha_service: service,
				});
			}
		}

		if (!register.allowMultipleAccounts) {
			// TODO: check if fingerprint was eligible generated
			const exists = await User.findOne({
				where: { fingerprints: body.fingerprint },
				select: ["id"],
			});

			if (exists) {
				throw FieldErrors({
					email: {
						code: "EMAIL_ALREADY_REGISTERED",
						message: req.t(
							"auth:register.EMAIL_ALREADY_REGISTERED",
						),
					},
				});
			}
		}

		if (register.blockProxies) {
			if (isProxy(await IPAnalysis(ip))) {
				console.log(`proxy ${ip} blocked from registration`);
				throw new HTTPError("Your IP is blocked from registration");
			}
		}

		// TODO: gift_code_sku_id?
		// TODO: check password strength

		if (email) {
			// replace all dots and chars after +, if its a gmail.com email
			if (!email) {
				throw FieldErrors({
					email: {
						code: "INVALID_EMAIL",
						message: req?.t("auth:register.INVALID_EMAIL"),
					},
				});
			}

			// check if there is already an account with this email
			const exists = await User.findOne({ where: { email: email } });

			if (exists) {
				throw FieldErrors({
					email: {
						code: "EMAIL_ALREADY_REGISTERED",
						message: req.t(
							"auth:register.EMAIL_ALREADY_REGISTERED",
						),
					},
				});
			}
		} else if (register.email.required) {
			throw FieldErrors({
				email: {
					code: "BASE_TYPE_REQUIRED",
					message: req.t("common:field.BASE_TYPE_REQUIRED"),
				},
			});
		}

		if (register.dateOfBirth.required && !body.date_of_birth) {
			throw FieldErrors({
				date_of_birth: {
					code: "BASE_TYPE_REQUIRED",
					message: req.t("common:field.BASE_TYPE_REQUIRED"),
				},
			});
		} else if (
			register.dateOfBirth.required &&
			register.dateOfBirth.minimum
		) {
			const minimum = new Date();
			minimum.setFullYear(
				minimum.getFullYear() - register.dateOfBirth.minimum,
			);
			body.date_of_birth = new Date(body.date_of_birth as Date);

			// higher is younger
			if (body.date_of_birth > minimum) {
				throw FieldErrors({
					date_of_birth: {
						code: "DATE_OF_BIRTH_UNDERAGE",
						message: req.t("auth:register.DATE_OF_BIRTH_UNDERAGE", {
							years: register.dateOfBirth.minimum,
						}),
					},
				});
			}
		}

		if (body.password) {
			// the salt is saved in the password refer to bcrypt docs
			body.password = await bcrypt.hash(body.password, 12);
		} else if (register.password.required) {
			throw FieldErrors({
				password: {
					code: "BASE_TYPE_REQUIRED",
					message: req.t("common:field.BASE_TYPE_REQUIRED"),
				},
			});
		}

		if (
			!body.invite &&
			(register.requireInvite ||
				(register.guestsRequireInvite && !register.email))
		) {
			// require invite to register -> e.g. for organizations to send invites to their employees
			throw FieldErrors({
				email: {
					code: "INVITE_ONLY",
					message: req.t("auth:register.INVITE_ONLY"),
				},
			});
		}

		const user = await User.register({ ...body, req });

		if (body.invite) {
			// await to fail if the invite doesn't exist (necessary for requireInvite to work properly) (username only signups are possible)
			await Invite.joinGuild(user.id, body.invite);
		}

		console.log("register", body.email, body.username, ip);

		return res.json({ token: await generateToken(user.id) });
	},
);

export default router;

/**
 * POST /auth/register
 * @argument { "fingerprint":"805826570869932034.wR8vi8lGlFBJerErO9LG5NViJFw", "email":"qo8etzvaf@gmail.com", "username":"qp39gr98", "password":"wtp9gep9gw", "invite":null, "consent":true, "date_of_birth":"2000-04-04", "gift_code_sku_id":null, "captcha_key":null}
 *
 * Field Error
 * @returns { "code": 50035, "errors": { "consent": { "_errors": [{ "code": "CONSENT_REQUIRED", "message": "You must agree to Discord's Terms of Service and Privacy Policy." }]}}, "message": "Invalid Form Body"}
 *
 * Success 200:
 * @returns {token: "OMITTED"}
 */
