import { NextResponse } from "next/server";
import bcrypt from "bcryptjs";
import prisma from "@/lib/prisma";

export async function POST(req: Request) {
  try {
    const body = await req.json();
    const { name, email, password, department } = body;

    if (!name || !email || !password) {
      return NextResponse.json({ error: "Missing required fields" }, { status: 400 });
    }

    const existing = await prisma.user.findUnique({ where: { email } });
    if (existing) {
      return NextResponse.json({ error: "Email already registered" }, { status: 400 });
    }

    const hashedPassword = await bcrypt.hash(password, 10);

    const user = await prisma.user.create({
      data: {
        name,
        email,
        password: hashedPassword,
        department: department || "General",
        role: "EMPLOYEE",
      },
    });

    // Create default leave balances
    const currentYear = new Date().getFullYear();
    const leaveTypes = await prisma.leaveType.findMany({ where: { isActive: true } });

    for (const lt of leaveTypes) {
      await prisma.leaveBalance.create({
        data: {
          userId: user.id,
          leaveTypeId: lt.id,
          year: currentYear,
          allocated: lt.defaultDays,
        },
      });
    }

    return NextResponse.json({ message: "User registered successfully" }, { status: 201 });
  } catch (error) {
    console.error("Registration error:", error);
    return NextResponse.json({ error: "Internal server error" }, { status: 500 });
  }
}