// pages/api/register.ts
import type { NextApiRequest, NextApiResponse } from "next";
import { PrismaClient } from "@prisma/client";
import bcrypt from "bcrypt";
import jwt from "jsonwebtoken";

const prisma = new PrismaClient();
const SECRET_KEY = process.env.JWT_SECRET as string;

export default async function handler(req: NextApiRequest, res: NextApiResponse) {
  if (req.method !== "POST") return res.status(405).json({ message: "Method not allowed" });

  try {
    const { email, password } = req.body as { email?: string; password?: string };

    if (!email || !password) return res.status(400).json({ message: "Email and password are required" });

    const existingUser = await prisma.user.findUnique({ where: { email } });
    if (existingUser) return res.status(400).json({ message: "User already exists" });

    const hashedPassword = await bcrypt.hash(password, 10);
    const user = await prisma.user.create({
      data: { email, password: hashedPassword },
      select: { id: true, email: true, createdAt: true }, // do NOT expose password
    });

    const token = jwt.sign({ sub: user.id, email: user.email }, SECRET_KEY, { expiresIn: "1d" });

    // Set a secure, httpOnly cookie
    const maxAge = 60 * 60 * 24; // 1 day
    res.setHeader(
      "Set-Cookie",
      `token=${token}; HttpOnly; Path=/; Max-Age=${maxAge}; SameSite=Strict; Secure`
    );

    return res.status(201).json({ message: "User registered", user });
  } catch (err) {
    console.error(err);
    return res.status(500).json({ message: "Something went wrong" });
  }
}