// Pure helpers for the public landing page, kept out of the Svelte component so the
// platform-entry 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://telegram.me/${name}` : null;
}

/**
 * vkAppLink returns the VK Mini App link for the landing "Play on VK" entry, or null when it is
 * not configured. The link is a build-time var (VITE_VK_APP_LINK, the full URL
 * `https://vk.com/app<id>`) because the test and prod contours run the same VK app but the var
 * mirrors the per-contour Telegram entries.
 */
export function vkAppLink(): string | null {
  const raw = import.meta.env.VITE_VK_APP_LINK;
  const link = (raw as string | undefined)?.trim();
  return link ? link : null;
}