import { NextRequest, NextResponse } from "next/server";
import { users, type User } from "../../mockData"; // adjust relative path

type UpdateUserBody = Partial<{
  firstName: string;
  lastName: string;
  email: string;
  phone: string;
  role: string;
}>;

export async function PUT(
  request: NextRequest,
  { params }: { params: Promise<{ id: string }> }
) {
  const { id } = await params;

  let body: unknown;
  try {
    body = await request.json();
  } catch {
    return NextResponse.json({ error: "Invalid JSON body" }, { status: 400 });
  }

  const { firstName, lastName, email, phone, role } = body as UpdateUserBody;

  const userIndex = users.findIndex((u: User) => u.id === id);
  if (userIndex === -1) {
    return NextResponse.json({ error: "User not found" }, { status: 404 });
  }

  const existingUser = users[userIndex];

  const updatedUser: User = {
    ...existingUser,
    firstName: firstName ?? existingUser.firstName,
    lastName: lastName ?? existingUser.lastName,
    email: email ?? existingUser.email,
    phone: phone ?? existingUser.phone,
    authorities: role ? [role] : existingUser.authorities ?? [],
  };

  users[userIndex] = updatedUser;

  return NextResponse.json(updatedUser, { status: 200 });
}