using PnvPanel.Domain.Billing;
using PnvPanel.Domain.Exceptions;
using Xunit;

namespace PnvPanel.Domain.Tests.Billing;

public class PaymentRequestTests
{
    [Fact]
    public void Create_StartsInAwaitingPayment()
    {
        var request = PaymentRequest.Create(Guid.NewGuid(), PaymentPeriod.Quarter, 1500);

        Assert.Equal(PaymentRequestStatus.AwaitingPayment, request.Status);
        Assert.Equal(1500, request.AmountSnapshot);
    }

    [Fact]
    public void MarkPaymentSent_FromAwaitingPayment_MovesToAwaitingConfirmation()
    {
        var request = PaymentRequest.Create(Guid.NewGuid(), PaymentPeriod.Quarter, 1500);

        request.MarkPaymentSent();

        Assert.Equal(PaymentRequestStatus.AwaitingConfirmation, request.Status);
    }

    [Fact]
    public void MarkPaymentSent_WhenAlreadySent_Throws()
    {
        var request = PaymentRequest.Create(Guid.NewGuid(), PaymentPeriod.Quarter, 1500);
        request.MarkPaymentSent();

        Assert.Throws<DomainException>(() => request.MarkPaymentSent());
    }

    [Fact]
    public void Cancel_FromAwaitingPayment_MovesToCancelled()
    {
        var request = PaymentRequest.Create(Guid.NewGuid(), PaymentPeriod.Quarter, 1500);

        request.Cancel();

        Assert.Equal(PaymentRequestStatus.Cancelled, request.Status);
    }

    [Fact]
    public void Cancel_AfterMarkPaymentSent_Throws()
    {
        var request = PaymentRequest.Create(Guid.NewGuid(), PaymentPeriod.Quarter, 1500);
        request.MarkPaymentSent();

        Assert.Throws<DomainException>(() => request.Cancel());
    }

    [Fact]
    public void Confirm_FromAwaitingConfirmation_Succeeds()
    {
        var adminId = Guid.NewGuid();
        var request = PaymentRequest.Create(Guid.NewGuid(), PaymentPeriod.Year, 5000);
        request.MarkPaymentSent();

        request.Confirm(adminId);

        Assert.Equal(PaymentRequestStatus.Confirmed, request.Status);
        Assert.Equal(adminId, request.DecidedBy);
        Assert.NotNull(request.DecidedAt);
    }

    [Fact]
    public void Confirm_FromAwaitingPayment_Succeeds()
    {
        // Админ мог увидеть оплату раньше, чем пользователь нажал "Я оплатил".
        var request = PaymentRequest.Create(Guid.NewGuid(), PaymentPeriod.Year, 5000);

        request.Confirm(Guid.NewGuid());

        Assert.Equal(PaymentRequestStatus.Confirmed, request.Status);
    }

    [Fact]
    public void Reject_FromAwaitingConfirmation_SetsReason()
    {
        var request = PaymentRequest.Create(Guid.NewGuid(), PaymentPeriod.HalfYear, 3000);
        request.MarkPaymentSent();

        request.Reject(Guid.NewGuid(), "Платёж не найден");

        Assert.Equal(PaymentRequestStatus.Rejected, request.Status);
        Assert.Equal("Платёж не найден", request.RejectionReason);
    }

    [Fact]
    public void Confirm_WhenAlreadyDecided_Throws()
    {
        var request = PaymentRequest.Create(Guid.NewGuid(), PaymentPeriod.Quarter, 1500);
        request.Cancel();

        Assert.Throws<DomainException>(() => request.Confirm(Guid.NewGuid()));
    }
}