server {
    listen 80;
    server_name _;

    # Increase buffer for WAV downloads
    proxy_buffers         16 64k;
    proxy_buffer_size     128k;
    proxy_read_timeout    120s;

    # Gzip (skip audio/wav — already binary)
    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml;

    location / {
        proxy_pass         http://app:3000;
        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;
    }

    # Cache static Next.js assets aggressively
    location /_next/static/ {
        proxy_pass       http://app:3000;
        add_header       Cache-Control "public, max-age=31536000, immutable";
    }

    # WAV downloads — no nginx caching (app sets its own Cache-Control)
    location /api/generate {
        proxy_pass         http://app:3000;
        proxy_buffering    off;
        proxy_read_timeout 120s;
    }
}