"use server";
import { prisma, Prisma } from "@repo/db";
import bcrypt from "bcryptjs";
import OLD_USER from "../../api/auth/[...nextauth]/var.User.json";
import { OldUser } from "../../../types/oldUser";

export const register = async ({ password, ...user }: Omit<Prisma.UserCreateInput, "publicId">) => {
	const hashedPassword = await bcrypt.hash(password, 12);
	const lastUserPublicId = await prisma.user.findFirst({
		select: {
			publicId: true,
		},
		orderBy: {
			publicId: "desc",
		},
	});
	let varPublicId = "VAR0000";
	if (lastUserPublicId) {
		const lastUserInt = parseInt(lastUserPublicId.publicId.replace("VAR", ""));
		varPublicId = `VAR${(lastUserInt + 1).toString().padStart(4, "0")}`;
	}

	const existingUser = await prisma.user.findFirst({
		where: {
			email: user.email,
		},
		select: {
			id: true,
		},
	});

	const existingOldUser = (OLD_USER as OldUser[]).find(
		(u) => u.email.toLocaleLowerCase() === user.email,
	);

	if (existingUser) {
		return {
			error: "Ein Nutzer mit dieser E-Mail-Adresse existiert bereits.",
		};
	}

	if (existingOldUser) {
		return {
			error:
				"Diese Email existriert bereits in der alten Version von VAR. Bitte melde dich an oder ändere dein Passwort.",
		};
	}

	const newUser = prisma.user.create({
		data: {
			...user,
			publicId: varPublicId,
			password: hashedPassword,
		},
	});
	return newUser;
};