// Shared helpers for the Tauri app updater. Used by the auto-check modal
// (UpdateNotifier) and the manual check in Settings → Updates & Support.

export const SKIP_KEY = "rapport_update_skipped_version";
export const LAST_CHECK_KEY = "rapport_update_last_check";

export function isTauri() {
  return typeof window !== "undefined" && !!window.__TAURI_INTERNALS__;
}

export async function checkForAppUpdate({ respectSkip = true } = {}) {
  if (!isTauri()) return { available: false, isTauri: false };
  const { check } = await import("@tauri-apps/plugin-updater");
  const result = await check();
  localStorage.setItem(LAST_CHECK_KEY, new Date().toISOString());
  if (!result?.available) return { available: false, update: null, isTauri: true };
  if (respectSkip && localStorage.getItem(SKIP_KEY) === result.version) {
    return { available: false, update: result, isTauri: true, skipped: true };
  }
  return { available: true, update: result, isTauri: true };
}

export async function installAppUpdate(update, onProgress) {
  await update.downloadAndInstall(onProgress);
  const { relaunch } = await import("@tauri-apps/plugin-process");
  await relaunch();
}

export function skipUpdateVersion(version) {
  if (version) localStorage.setItem(SKIP_KEY, version);
}

export function getLastUpdateCheck() {
  return localStorage.getItem(LAST_CHECK_KEY);
}

export function formatLastCheck(iso) {
  if (!iso) return "noch nie";
  try {
    const d = new Date(iso);
    return d.toLocaleString("de-CH", {
      day: "2-digit", month: "long", year: "numeric",
      hour: "2-digit", minute: "2-digit",
    });
  } catch {
    return "—";
  }
}