/**
 * Opens a phone number for calling. Uses native tel: navigation so the OS
 * or WebView can open the dialer. Does not use Telegram openLink() for tel:
 * (protocol is not supported; it closes the app on desktop and does nothing on mobile).
 */

/**
 * Builds a tel: URL from a phone string (digits and optional leading + only).
 */
function buildTelUrl(phone: string): string {
  const trimmed = String(phone).trim();
  if (trimmed === "") return "";
  const digits = trimmed.replace(/\D/g, "");
  if (digits.length === 11 && (digits[0] === "7" || digits[0] === "8")) {
    return `tel:+7${digits.slice(1)}`;
  }
  if (digits.length === 10) {
    return `tel:+7${digits}`;
  }
  return `tel:${trimmed.startsWith("+") ? "+" : ""}${digits}`;
}

/**
 * Opens the given phone number for calling. Tries window.open(telUrl) first
 * (reported to work for tel: in some Telegram WebViews), then a programmatic
 * click on a temporary tel: link. openLink(tel:) is not used — Telegram does
 * not support it (closes app on desktop, no dialer on mobile). Safe to call
 * from click handlers; does not throw.
 */
export function openPhoneLink(phone: string | null | undefined): void {
  if (phone == null || String(phone).trim() === "") return;
  const telUrl = buildTelUrl(phone);
  if (telUrl === "") return;
  if (typeof window === "undefined" || !window.document) return;

  const opened = window.open(telUrl);
  if (opened !== null) return;

  const anchor = window.document.createElement("a");
  anchor.href = telUrl;
  anchor.style.display = "none";
  anchor.setAttribute("aria-hidden", "true");
  window.document.body.appendChild(anchor);
  anchor.click();
  anchor.remove();
}