import { NextResponse } from "next/server";
import type { NextRequest } from "next/server";
import { getConfig } from "@/lib/config/load";
import { verifySessionCookieValue } from "@/lib/auth/session";

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

/** Optimistic (cookie-only) check - centralizes redirect logic per the Next.js Proxy guidance.
 * Every Route Handler also calls `requireAuth()` itself as the real, defense-in-depth check. */
export async function proxy(request: NextRequest) {
  const { config } = getConfig();
  if (!config.auth.enabled) return NextResponse.next();

  const { pathname } = request.nextUrl;
  if (
    PUBLIC_PATHS.some(
      (path) => pathname === path || pathname.startsWith("/_next"),
    )
  ) {
    return NextResponse.next();
  }

  const isApiRoute = pathname.startsWith("/api/");

  if (isApiRoute) {
    // Token-authed API clients won't have a session cookie; let the route handler's requireAuth()
    // do the real check instead of rejecting here.
    if (request.headers.get("authorization")?.startsWith("Bearer "))
      return NextResponse.next();
  }

  const sealed = request.cookies.get("triggershell_session")?.value;
  const session = await verifySessionCookieValue(sealed);

  if (!session?.userId) {
    if (isApiRoute) {
      return NextResponse.json({ error: "Unauthorized" }, { 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).*)"],
};