# Billing System Security
RewriteEngine On

# Block access to sensitive files
<Files ~ "^\.ht">
    Order allow,deny
    Deny from all
</Files>

# Protect config directory
<Directory "config">
    Order allow,deny
    Deny from all
</Directory>

# Protect includes directory
<Directory "includes">
    Order allow,deny
    Deny from all
</Directory>

# Protect classes directory
<Directory "classes">
    Order allow,deny
    Deny from all
</Directory>

# Security headers
<IfModule mod_headers.c>
    Header always set X-Content-Type-Options nosniff
    Header always set X-Frame-Options SAMEORIGIN
    Header always set X-XSS-Protection "1; mode=block"
</IfModule>

# Pretty URLs
RewriteRule ^admin/?$ admin/index.php [L]
RewriteRule ^admin/([^/]+)/?$ admin/$1.php [L]

# Block installer after installation
RewriteCond %{REQUEST_FILENAME} install\.php
RewriteCond %{DOCUMENT_ROOT}/config/installed.lock -f
RewriteRule .* - [R=404,L]

# Compress files
<IfModule mod_deflate.c>
    AddOutputFilterByType DEFLATE text/plain
    AddOutputFilterByType DEFLATE text/html
    AddOutputFilterByType DEFLATE text/css
    AddOutputFilterByType DEFLATE application/javascript
    AddOutputFilterByType DEFLATE application/json
</IfModule>