upstream backend {
    server backend:3000;
}

upstream frontend {
    server frontend:5173;
}

server {
    listen 80;
    server_name localhost;

    # Exact match for bare /api (no trailing slash).
    # nginx's `location /api/` below requires a trailing slash, so a request for
    # GET /api would fall through to the Vite proxy, which then forwards it to
    # the backend — arriving as an unmatched path that New Relic registers as
    # the phantom "Expressjs/GET/api$" transaction bucket.
    # This exact-match block catches it first and proxies it directly to the
    # backend, where AppController's @Get() handler returns a clean 200.
    location = /api {
        proxy_pass http://backend;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }

    # API requests -> NestJS backend
    location /api/ {
        proxy_pass http://backend;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_cache_bypass $http_upgrade;
    }

    # AI endpoints now return immediately (async processing in background)
    # No special timeout needed — kept for documentation purposes

    # Everything else -> Vite dev server (frontend)
    location / {
        proxy_pass http://frontend;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_cache_bypass $http_upgrade;
    }
}