export function normalizePhoneE164(input?: string | null) {
  const digits = String(input || "").replace(/\D/g, "")
  if (!digits) {
    return ""
  }

  if (digits.length === 10) {
    return `+1${digits}`
  }

  if (digits.length === 11 && digits.startsWith("1")) {
    return `+${digits}`
  }

  if (digits.length >= 11) {
    return `+${digits}`
  }

  return ""
}

export function splitDisplayName(name?: string | null) {
  const trimmed = String(name || "").trim()
  if (!trimmed) {
    return {
      firstName: "",
      lastName: "",
      displayName: "",
    }
  }

  const parts = trimmed.split(/\s+/)
  const firstName = parts.shift() || ""
  const lastName = parts.join(" ")

  return {
    firstName,
    lastName,
    displayName: [firstName, lastName].filter(Boolean).join(" "),
  }
}