user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;

events {
    worker_connections 1024;
    use epoll;
}

http {
    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for"';

    access_log /var/log/nginx/access.log main;

    # Performance optimizations
    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;
    client_max_body_size 20M;

    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types
        text/plain
        text/css
        text/xml
        text/javascript
        application/json
        application/javascript
        application/x-javascript
        application/xml+rss
        image/svg+xml;
    gzip_min_length 256;
    gzip_disable "msie6";

    # Security headers
    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 "strict-origin-when-cross-origin" always;

    server {
        listen 80;
        server_name localhost;
        root /usr/share/nginx/html;
        index index.html;

        # Charset
        charset utf-8;

        # Custom error pages
        error_page 404 /index.html;
        error_page 500 502 503 504 /50x.html;

        # Main location
        location / {
            try_files $uri $uri/ /index.html;
        }

        # Cache static assets
        location ~* \.(jpg|jpeg|png|gif|ico|svg|webp)$ {
            expires 1y;
            add_header Cache-Control "public, immutable";
            access_log off;
        }

        location ~* \.(css|js)$ {
            expires 1y;
            add_header Cache-Control "public, immutable";
            access_log off;
        }

        location ~* \.(woff|woff2|ttf|otf|eot)$ {
            expires 1y;
            add_header Cache-Control "public, immutable";
            access_log off;
        }

        # HTML files - shorter cache
        location ~* \.html$ {
            expires 1h;
            add_header Cache-Control "public, must-revalidate";
        }

        # Deny access to hidden files
        location ~ /\. {
            deny all;
            access_log off;
            log_not_found off;
        }

        # Deny access to backup files
        location ~ ~$ {
            deny all;
            access_log off;
            log_not_found off;
        }
    }
}