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

events {
  worker_connections 1024;
}

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;

  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_min_length 1024;
  gzip_types text/plain text/css text/xml text/javascript
             application/x-javascript application/xml+rss
             application/javascript application/json;

  server {
    listen 80;
    server_name _;
    root /usr/share/nginx/html;

    # 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 "no-referrer-when-downgrade" always;

    # CORS headers - allow requests from any origin
    add_header Access-Control-Allow-Origin "*" always;
    add_header Access-Control-Allow-Methods "GET, OPTIONS" always;
    add_header Access-Control-Allow-Headers "Content-Type" always;

    # Handle preflight requests
    if ($request_method = 'OPTIONS') {
      return 204;
    }

    # CSS and JS - long cache, versioning handled by filenames
    location ~* \.(css|js)$ {
      expires 1y;
      add_header Cache-Control "public, immutable, max-age=31536000" always;
    }

    # Fonts - long cache
    location ~* \.(woff|woff2|ttf|otf|eot)$ {
      expires 1y;
      add_header Cache-Control "public, immutable, max-age=31536000" always;
    }

    # Images - moderate cache
    location ~* \.(jpg|jpeg|png|gif|svg|ico|webp)$ {
      expires 30d;
      add_header Cache-Control "public, max-age=2592000" always;
    }

    # Everything else - short cache
    location / {
      expires 1h;
      add_header Cache-Control "public, max-age=3600" always;
      try_files $uri $uri/ =404;
    }
  }
}