// Pure helpers for the public landing page, kept out of the Svelte component so the
// Telegram-channel link selection is unit-testable.

/**
 * telegramChannelLink returns the t.me link for the single bot's game channel, or null
 * when it is not configured. The channel username is a build-time var
 * (VITE_TELEGRAM_GAME_CHANNEL_NAME) because the test and prod contours run different
 * channels; it is the same channel the connector posts to via TELEGRAM_GAME_CHANNEL_ID
 * (the id to post, the name to link). A leading "@" is tolerated.
 */
export function telegramChannelLink(): string | null {
  const raw = import.meta.env.VITE_TELEGRAM_GAME_CHANNEL_NAME;
  const name = (raw as string | undefined)?.trim().replace(/^@/, '');
  return name ? `https://t.me/${name}` : null;
}