export async function copyTextToClipboard(text: string): Promise<boolean> {
  if (
    typeof navigator !== "undefined" &&
    typeof window !== "undefined" &&
    window.isSecureContext !== false &&
    navigator.clipboard?.writeText
  ) {
    try {
      await navigator.clipboard.writeText(text);
      return true;
    } catch {
      // Fall through to execCommand fallback.
    }
  }

  if (typeof document === "undefined" || !document.body) {
    return false;
  }

  const textarea = document.createElement("textarea");
  textarea.value = text;
  textarea.setAttribute("readonly", "");
  textarea.style.position = "fixed";
  textarea.style.left = "-9999px";
  textarea.style.top = "0";
  textarea.style.opacity = "0";
  textarea.style.pointerEvents = "none";

  document.body.appendChild(textarea);

  try {
    textarea.focus();
    textarea.select();
    textarea.setSelectionRange(0, text.length);
    return document.execCommand("copy");
  } catch {
    return false;
  } finally {
    textarea.remove();
  }
}