server {
    listen 80;
    listen [::]:80;

    server_name _;
    root /var/www/html;
    index index.php index.html index.htm;

    # Basic security headers (can be extended per-site)
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "no-referrer-when-downgrade" always;
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;

    # Deny access to hidden files and directories
    location ~ (^|/)[.] {
        deny all;
        access_log off;
        log_not_found off;
    }

    # Static files: long cache, immutable where appropriate
    location ~* \.(?:css|js|gif|jpe?g|png|ico|svg|woff2?|ttf|eot)$ {
        try_files $uri =404;
        access_log off;
        expires 30d;
        add_header Cache-Control "public, max-age=2592000, immutable";
    }

    location = /favicon.ico { access_log off; log_not_found off; }
    location = /robots.txt  { access_log off; log_not_found off; allow all; }

    # Main front controller; fall back to index.php
    location / {
        try_files $uri $uri/ /index.php$is_args$args;
    }

    # PHP-FPM handling; pass to php-fpm:9000 (docker service name)
    location ~ [^/]
    \.php(/|$) {
        # Prevent direct access to PHP files in uploads or other writable dirs if necessary
        try_files $document_root$fastcgi_script_name =404;

        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        # Use TCP FPM backend service name. Matches the php-fpm image we built.
        fastcgi_pass php-fpm:9000;
        fastcgi_index index.php;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_param PATH_INFO $fastcgi_path_info;
        fastcgi_param HTTPS $https if_not_empty;
        fastcgi_read_timeout 300;
    }

    # Block access to .ht* files
    location ~* /\.(?:ht|git) {
        deny all;
    }

    # Optional: small buffer for large headers (WordPress with many cookies/plugins)
    fastcgi_buffers 16 16k;
    fastcgi_buffer_size 32k;

    # Prevent clickjacking on all responses
    add_header X-Frame-Options "SAMEORIGIN";
}

# Default server; allow override by mounting /etc/nginx/conf.d/default.conf