import { NextRequest, NextResponse } from 'next/server';

import { isAgentRuntimeConfigured, isProWorkbenchEnabled } from '@/lib/config/feature-flags';
import { verifyAccessTokenEdge } from '@/lib/server/access-token-edge';

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

  // Return an actual server-side 404 when either half of the workbench is off.
  // Edge middleware cannot reliably inspect server-only deployment variables,
  // so it enforces the public gate and leaves the complete runtime/database
  // check to Node. A Node-hosted middleware uses the same gate as startup.
  const canInspectServerRuntime = process.env.NEXT_RUNTIME !== 'edge';
  const workbenchEnabled =
    isProWorkbenchEnabled() && (!canInspectServerRuntime || isAgentRuntimeConfigured());
  if (!workbenchEnabled && (pathname === '/workbench' || pathname.startsWith('/workbench/'))) {
    return new NextResponse('Not found', { status: 404 });
  }

  const accessCode = process.env.ACCESS_CODE;
  if (!accessCode) {
    return NextResponse.next();
  }

  // Whitelist: access-code endpoints, health check
  if (pathname.startsWith('/api/access-code/') || pathname === '/api/health') {
    return NextResponse.next();
  }

  // Check cookie — validate HMAC signature, not just existence
  const cookie = request.cookies.get('openmaic_access');
  if (cookie?.value && (await verifyAccessTokenEdge(cookie.value, accessCode))) {
    return NextResponse.next();
  }

  // API requests without valid cookie → 401
  if (pathname.startsWith('/api/')) {
    return NextResponse.json(
      { success: false, errorCode: 'INVALID_REQUEST', error: 'Access code required' },
      { status: 401 },
    );
  }

  // Page requests → let through, frontend shows modal
  return NextResponse.next();
}

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