RewriteEngine On

# Handle CORS preflight requests
RewriteCond %{REQUEST_METHOD} OPTIONS
RewriteRule ^(.*)$ $1 [R=200,L]

# Route cart operations
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^add/?$ add.php [L]
RewriteRule ^update/?$ update.php [L]
RewriteRule ^remove/?$ remove.php [L]
RewriteRule ^clear/?$ clear.php [L]

# Default to index.php for GET requests
RewriteCond %{REQUEST_METHOD} GET
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^.*$ index.php [L]