const USD_KEY = "cyberlux-usd-store-credit";
const TX_KEY = "cyberlux-btc-claimed-txids";

export function loadUsdStoreCredit(): number {
  if (typeof window === "undefined") return 0;
  try {
    const raw = localStorage.getItem(USD_KEY);
    if (!raw) return 0;
    const n = Number.parseFloat(raw);
    return Number.isFinite(n) ? Math.round(n * 100) / 100 : 0;
  } catch {
    return 0;
  }
}

export function saveUsdStoreCredit(usd: number): void {
  if (typeof window === "undefined") return;
  const safe = Math.max(0, Math.round(usd * 100) / 100);
  localStorage.setItem(USD_KEY, String(safe));
}

export function loadClaimedTxids(): string[] {
  if (typeof window === "undefined") return [];
  try {
    const raw = localStorage.getItem(TX_KEY);
    if (!raw) return [];
    const parsed = JSON.parse(raw) as unknown;
    if (!Array.isArray(parsed)) return [];
    return parsed.map((x) => String(x)).filter((t) => /^[a-fA-F0-9]{64}$/.test(t));
  } catch {
    return [];
  }
}

export function saveClaimedTxids(txids: string[]): void {
  if (typeof window === "undefined") return;
  localStorage.setItem(TX_KEY, JSON.stringify([...new Set(txids)]));
}