import { randomBytes } from "crypto";

export interface LNbitsInvoice {
  paymentHash: string;
  paymentRequest: string;
}

export interface LNbitsInvoiceStatus {
  paid: boolean;
  paidAt?: Date;
}

const paidInvoices = new Set<string>();

export async function createInvoice(
  amountSats: number,
  memo: string,
): Promise<LNbitsInvoice> {
  const paymentHash = randomBytes(32).toString("hex");
  const paymentRequest = `lnbcrt${amountSats}u1stub_${paymentHash.slice(0, 16)}`;
  console.log(`[stub] Created invoice: ${amountSats} sats — "${memo}" — hash=${paymentHash}`);
  return { paymentHash, paymentRequest };
}

export async function checkInvoicePaid(
  paymentHash: string,
): Promise<LNbitsInvoiceStatus> {
  if (paidInvoices.has(paymentHash)) {
    return { paid: true, paidAt: new Date() };
  }
  return { paid: false };
}

export function markInvoicePaid(paymentHash: string): void {
  paidInvoices.add(paymentHash);
  console.log(`[stub] Marked invoice paid: hash=${paymentHash}`);
}