import Foundation

/// Phone number normalization utilities
public enum PhoneUtils {
    /// Normalize a phone number to a consistent format:
    /// - 10 digits → +1XXXXXXXXXX (US number)
    /// - 11 digits starting with 1 → +1XXXXXXXXXX
    /// - Already has + prefix → keep digits only
    /// - Otherwise → digits only
    public static func normalize(_ phone: String) -> String {
        let digits = phone.filter { $0.isNumber || $0 == "+" }
        if digits.hasPrefix("1") && !digits.hasPrefix("+") && digits.count == 11 {
            return "+" + digits
        }
        if !digits.hasPrefix("+") && digits.count == 10 {
            return "+1" + digits
        }
        return digits
    }
}