ANTOOZA-BACKEND/Tests/Application.Tests/FakeTossPaymentService.cs

using Application.Abstractions.Payment;

namespace Application.Tests;

/// <summary>
/// ITossPaymentService 수제 fake — PG 호출 횟수를 기록하고 설정된 결과/예외를 반환한다.
/// </summary>
internal sealed class FakeTossPaymentService : ITossPaymentService
{
    public TossPaymentResult ConfirmResult { get; set; } = Done();
    public Exception? ConfirmException { get; set; }
    public TossPaymentResult CancelResult { get; set; } = Cancelled();
    public Exception? CancelException { get; set; }
    public TossPaymentResult GetPaymentResult { get; set; } = Done();
    public Exception? GetPaymentException { get; set; }

    public int ConfirmCallCount { get; private set; }
    public int CancelCallCount { get; private set; }
    public int GetPaymentCallCount { get; private set; }

    public Task<TossClientConfig> GetClientConfigAsync(CancellationToken ct)
        => Task.FromResult(new TossClientConfig("test_ck_fake"));

    public Task<TossPaymentResult> ConfirmAsync(string paymentKey, string orderID, int amount, CancellationToken ct)
    {
        ConfirmCallCount++;

        if (ConfirmException is not null)
        {
            throw ConfirmException;
        }

        return Task.FromResult(ConfirmResult);
    }

    public Task<TossPaymentResult> CancelAsync(string paymentKey, string cancelReason, int? cancelAmount, CancellationToken ct)
    {
        CancelCallCount++;

        if (CancelException is not null)
        {
            throw CancelException;
        }

        return Task.FromResult(CancelResult);
    }

    public Task<TossPaymentResult> GetPaymentAsync(string paymentKey, CancellationToken ct)
    {
        GetPaymentCallCount++;

        if (GetPaymentException is not null)
        {
            throw GetPaymentException;
        }

        return Task.FromResult(GetPaymentResult);
    }

    /// <summary>승인/조회 성공 (status=DONE)</summary>
    public static TossPaymentResult Done(string? paymentKey = null, string? orderID = null, int? totalAmount = null) => new(
        Success: true, Code: null, Message: null,
        PaymentKey: paymentKey, OrderID: orderID, Status: "DONE",
        TotalAmount: totalAmount, Method: "카드", ApprovedAt: DateTime.UtcNow, ReceiptUrl: "https://receipt.antooza.test",
        VirtualAccountNumber: null, VirtualAccountBankCode: null, VirtualAccountHolder: null, VirtualAccountDueDate: null,
        Cancels: [], RawJson: "{}");

    /// <summary>토스의 명시적 거절 {code, message}</summary>
    public static TossPaymentResult Fail(string code = "REJECT_CARD_COMPANY", string message = "승인 거절")
        => Done() with { Success = false, Code = code, Message = message, Status = null };

    /// <summary>가상계좌 발급 (status=WAITING_FOR_DEPOSIT)</summary>
    public static TossPaymentResult WaitingDeposit() => Done() with
    {
        Status = "WAITING_FOR_DEPOSIT",
        VirtualAccountNumber = "9-4444-0000-1234",
        VirtualAccountBankCode = "20",
        VirtualAccountHolder = "개미투자",
        VirtualAccountDueDate = DateTime.UtcNow.AddDays(7)
    };

    /// <summary>취소 성공 (status=CANCELED, cancels[] 1건)</summary>
    public static TossPaymentResult Cancelled(int cancelAmount = 0) => Done() with
    {
        Status = "CANCELED",
        Cancels = new List<TossCancelDetail> { new("CANCEL-TX", cancelAmount, "취소", DateTime.UtcNow) }
    };
}