namespace HrynCo.NotificationService.Worker.Services.EmailProcessing;

public static class RecipientAddressRedactor
{
    public static string Redact(string? address)
    {
        if (string.IsNullOrWhiteSpace(address))
            return "<missing>";

        int separator = address.LastIndexOf('@');
        if (separator <= 0 || separator == address.Length - 1)
            return "***";

        string local = address[..separator];
        string domain = address[(separator + 1)..];
        int dot = domain.LastIndexOf('.');
        string domainName = dot > 0 ? domain[..dot] : domain;
        string suffix = dot > 0 ? domain[dot..] : string.Empty;

        return $"{local[0]}***@{domainName[0]}***{suffix}";
    }
}