# Main Nginx configuration optimized for production
user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;

# Worker configuration
events {
    worker_connections 1024;
    use epoll;
    multi_accept on;
}

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

    # Logging format
    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for" '
                    'rt=$request_time uct="$upstream_connect_time" '
                    'uht="$upstream_header_time" urt="$upstream_response_time"';

    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;
    server_tokens off;

    # Buffer sizes
    client_body_buffer_size 128k;
    client_max_body_size 50m;
    client_header_buffer_size 1k;
    large_client_header_buffers 4 4k;
    output_buffers 1 32k;
    postpone_output 1460;

    # Timeouts
    client_header_timeout 30s;
    client_body_timeout 30s;
    send_timeout 30s;

    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_min_length 1000;
    gzip_types
        text/plain
        text/css
        text/xml
        text/javascript
        application/json
        application/javascript
        application/xml+rss
        application/atom+xml
        image/svg+xml;

    # Rate limiting
    limit_req_zone $binary_remote_addr zone=api:10m rate=100r/m;
    limit_req_zone $binary_remote_addr zone=static:10m rate=1000r/m;
    limit_req_status 429;

    # Connection limiting
    limit_conn_zone $binary_remote_addr zone=conn_limit_per_ip:10m;
    limit_conn conn_limit_per_ip 10;

    # Include configurations
    include /etc/nginx/conf.d/*.conf;
    include /etc/nginx/sites-enabled/*.conf;
}