import { AppError } from '../common/errors/app-error';
import type { CapturedPayment } from './gateway.contract';
export interface ExpectedPayment {
  orderId: string;
  paymentId: string;
  amountMinor: string;
  currency: string;
  expiresAt: Date;
  cancelled: boolean;
  alreadyCaptured: boolean;
}
export function captureDecision(
  expected: ExpectedPayment,
  event: CapturedPayment,
  now: Date,
) {
  if (
    event.orderId !== expected.orderId ||
    event.paymentId !== expected.paymentId
  )
    throw new AppError('PAYMENT_REFERENCE_MISMATCH');
  if (event.currency !== expected.currency)
    throw new AppError('PAYMENT_CURRENCY_MISMATCH');
  if (event.amountMinor !== expected.amountMinor)
    throw new AppError('PAYMENT_AMOUNT_MISMATCH');
  if (expected.alreadyCaptured) return 'DUPLICATE' as const;
  if (expected.cancelled || expected.expiresAt <= now)
    return 'REVIEW_AND_REFUND' as const;
  return 'COMMIT_RESERVED_STOCK' as const;
}
export function refundAmount(
  captured: bigint,
  completed: bigint,
  pending: bigint,
  requested: bigint,
) {
  if (
    [captured, completed, pending].some((value) => value < 0n) ||
    requested <= 0n ||
    completed + pending + requested > captured
  )
    throw new AppError('REFUND_AMOUNT_INVALID');
  return requested.toString();
}