# ── Production HTTPS Setup ────────────────────────────────────────
# To enable HTTPS, run certbot or use a reverse proxy like Caddy.
# Example with certbot:
#   server {
#       listen 443 ssl http2;
#       server_name yourdomain.com;
#       ssl_certificate     /etc/letsencrypt/live/yourdomain.com/fullchain.pem;
#       ssl_certificate_key /etc/letsencrypt/live/yourdomain.com/privkey.pem;
#       # ... copy the rest of this config below ...
#   }
#   server {
#       listen 80;
#       server_name yourdomain.com;
#       return 301 https://$server_name$request_uri;
#   }
# ─────────────────────────────────────────────────────────────────
server {
    listen 80;
    server_name _;

    # Root directory for the built frontend
    root /usr/share/nginx/html;
    index index.html;

    # Gzip compression for better performance
    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml text/javascript image/svg+xml;
    gzip_min_length 256;

    # Increase max body size for document uploads (matching backend MAX_FILE_SIZE: 10MB)
    client_max_body_size 10M;

    # ── API proxy ─────────────────────────────────────────────
    # All /api/* requests are forwarded to the FastAPI backend.
    # The frontend code in production should use /api/... as the
    # base path (e.g., fetch('/api/chat', ...)).
    location /api/ {
        proxy_pass http://backend:8000/;
        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;

        # Timeouts for long-running streaming chat requests
        proxy_read_timeout 120s;
        proxy_send_timeout 120s;

        # Disable buffering needed for streaming responses
        proxy_buffering off;
    }

    # ── SPA fallback ──────────────────────────────────────────
    # For any non-file, non-API route, serve index.html so React
    # Router can handle client-side routing.
    location / {
        try_files $uri $uri/ /index.html;
    }
}