upstream frontend {
    server frontend:5173;
}

# ── HTTP Development Server ──
server {
    listen 80 default_server;
    client_max_body_size 100M;
    resolver 127.0.0.11 valid=30s ipv6=off;
    set $backend_upstream backend:5000;

    # API requests → Flask backend
    location /api/ {
        proxy_pass http://$backend_upstream;
        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;

        # Timeout for large file uploads
        proxy_read_timeout 300s;
        proxy_send_timeout 300s;
        proxy_connect_timeout 60s;
    }

    # Frontend (Vite dev server)
    location / {
        proxy_pass http://frontend;
        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 Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }

    # Health check
    location /health {
        proxy_pass http://$backend_upstream/api/health;
    }
}