server {
    listen 80;
    server_name localhost;
    
    root /usr/share/nginx/html;
    index index.html;
    
    location / {
        try_files $uri $uri/ =404;
    }
    
    # Cache JavaScript files with version query params for 1 year (immutable)
    # Files without version params are not cached
    location ~* \.(js|mjs)(\?v=[^&]+)?$ {
        if ($args ~ "v=") {
            # Has version param - cache for 1 year (immutable)
            add_header Cache-Control "public, max-age=31536000, immutable";
        }
        if ($args !~ "v=") {
            # No version param - don't cache
            add_header Cache-Control "no-cache, no-store, must-revalidate";
            add_header Pragma "no-cache";
            add_header Expires "0";
        }
        add_header Vary "Accept-Encoding";
    }
    
    location = /version.json {
        add_header Cache-Control "no-cache, no-store, must-revalidate";
        add_header Pragma "no-cache";
        add_header Expires "0";
    }
    
    # Prevent caching of HTML
    location ~* \.html$ {
        add_header Cache-Control "no-cache, no-store, must-revalidate";
        add_header Pragma "no-cache";
        add_header Expires "0";
    }
    
    # Enable gzip compression
    gzip on;
    gzip_types text/html text/css application/javascript;
    gzip_min_length 1000;
}