/**
 * 06 — Payment fees (3-mode: included / absorb / surcharge)
 *
 * A payment method can carry a processor fee. `feeMode` decides who pays it:
 *   - "included"  — the customer pays the goods total (fee not added); the
 *                   merchant bears the fee.
 *   - "absorb"    — the merchant eats the fee; customer still pays goods.
 *   - "surcharge" — the fee is added ON TOP; the customer pays goods + fee.
 *
 * Only "surcharge" changes what the customer is billed. This example shows the
 * two things a storefront needs:
 *   1. PREVIEW the surcharge line at method-select time with estimateSurcharge()
 *      — a bit-exact client-side mirror of the server math (no round-trip).
 *   2. Read the EXACT, authoritative fee off the checkout response payment.fee.
 *
 * ⚠️ payment.total is GROSS (goods + surcharge). Never re-add fee.amount to it.
 * ⚠️ Topups are ALWAYS net — never draw a surcharge line on a top-up.
 *
 * Run with:
 *   GAMECORE_API_KEY=gc_live_... bun run examples/06-payment-fees.ts
 */

import { GameCoreClient, estimateSurcharge } from "@gamecore-api/sdk";

const apiKey = process.env.GAMECORE_API_KEY!;
const baseUrl = "https://api.gamecore-api.tech";

const gc = new GameCoreClient({ apiKey, baseUrl });

// --- 1. Preview the surcharge for each method at selection time ---
const goodsTotal = 1000; // the cart subtotal the buyer currently sees
const methods = await gc.checkout.getPaymentMethods();

for (const m of methods) {
	const preview = estimateSurcharge({
		goods: goodsTotal,
		feePercent: m.feePercent,
		feeFixed: m.feeFixed,
		feeMode: m.feeMode,
	});
	if (preview.applies) {
		// e.g. "Card — Комиссия платёжной системы: 25 ₽ → к оплате 1025 ₽"
		console.log(
			`${m.label} — surcharge ${preview.fee} ₽ → pay ${preview.gross} ₽`,
		);
	} else {
		console.log(`${m.label} — no surcharge → pay ${goodsTotal} ₽`);
	}
}

// --- 2. After checkout.create(), the server fee is authoritative ---
// const res = await gc.checkout.create({ ... , paymentMethod: picked.type });
// const fee = res.payment?.fee;
// if (fee && fee.mode === "surcharge") {
//   // Render the real charged breakdown BEFORE redirecting to fee.amount:
//   //   Товары: fee.goodsTotal ₽ · Комиссия: fee.amount ₽ · Итого: res.payment.total ₽
//   console.log("charged breakdown", fee, "gross total", res.payment?.total);
// }