import { NextRequest, NextResponse } from "next/server";
import { SESSION_COOKIE_NAME, verifySessionToken } from "@/lib/auth";

const PUBLIC_PATHS = ["/login", "/api/auth/login", "/api/auth/register"];

export async function middleware(request: NextRequest) {
  const { pathname } = request.nextUrl;

  if (
    PUBLIC_PATHS.includes(pathname) ||
    pathname.startsWith("/_next") ||
    pathname.startsWith("/favicon")
  ) {
    return NextResponse.next();
  }

  const token = request.cookies.get(SESSION_COOKIE_NAME)?.value;
  const userId = token ? await verifySessionToken(token) : null;

  if (!userId) {
    if (pathname.startsWith("/api")) {
      return NextResponse.json({ error: "Nicht authentifiziert." }, { status: 401 });
    }
    const loginUrl = new URL("/login", request.url);
    loginUrl.searchParams.set("next", pathname);
    return NextResponse.redirect(loginUrl);
  }

  return NextResponse.next();
}

export const config = {
  matcher: ["/((?!_next/static|_next/image|favicon.ico).*)"],
};