/**
 * Clean and normalize phone number - removes +1 prefix and formats to 10 digits
 * Handles: +17048043320, 17048043320, (704) 804-3320, 704-804-3320, etc.
 * 
 * @param string $phone Raw phone number input
 * @return string Clean 10-digit phone number (e.g., "7048043320")
 */
function cleanPhoneNumber($phone) {
    // Remove all non-numeric characters except +
    $cleaned = preg_replace('/[^\d+]/', '', $phone);
    
    // Remove leading + if present
    $cleaned = ltrim($cleaned, '+');
    
    // If 11 digits starting with 1, remove the leading 1 (US country code)
    if (strlen($cleaned) === 11 && $cleaned[0] === '1') {
        $cleaned = substr($cleaned, 1);
    }
    
    // Keep only last 10 digits if more than 10
    if (strlen($cleaned) > 10) {
        $cleaned = substr($cleaned, -10);
    }
    
    return $cleaned;
}

/**
 * Format phone number as (XXX) XXX-XXXX for display
 * 
 * @param string $phone Phone number (raw or cleaned)
 * @return string Formatted phone number
 */
function formatPhoneNumber($phone) {
    $cleaned = cleanPhoneNumber($phone);
    
    if (strlen($cleaned) === 10) {
        return '(' . substr($cleaned, 0, 3) . ') ' . 
               substr($cleaned, 3, 3) . '-' . 
               substr($cleaned, 6, 4);
    }
    
    return $phone; // Return original if not 10 digits
}