using Microsoft.Extensions.Logging;
using NSubstitute;
using PnvPanel.Application.Billing;
using PnvPanel.Application.Billing.MarkPaymentSent;
using PnvPanel.Application.Common.Interfaces;
using PnvPanel.Application.Common.Models;
using PnvPanel.Application.Tests.TestSupport;
using PnvPanel.Domain.Billing;
using PnvPanel.Domain.Inbounds;
using PnvPanel.Domain.Nodes;
using Xunit;

namespace PnvPanel.Application.Tests.Billing.MarkPaymentSent;

public class MarkPaymentSentCommandHandlerTests
{
    private readonly IIdentityService _identityService = Substitute.For<IIdentityService>();
    private readonly IXuiPanelGateway _gateway = Substitute.For<IXuiPanelGateway>();
    private readonly IRealtimeNotifier _notifier = Substitute.For<IRealtimeNotifier>();
    private readonly ITelegramNotifier _telegramNotifier = Substitute.For<ITelegramNotifier>();
    private readonly ILogger<MarkPaymentSentCommandHandler> _logger = Substitute.For<
        ILogger<MarkPaymentSentCommandHandler>
    >();

    private MarkPaymentSentCommandHandler CreateHandler(IAppDbContext dbContext, Guid userId) =>
        new(dbContext, _identityService, _gateway, _notifier, _telegramNotifier, FakeCurrentUser.Authenticated(userId, "alice"), _logger);

    private static CurrentUserProfile Profile(Guid userId, DateTimeOffset? paidUntil) =>
        new(
            userId,
            "alice",
            Guid.NewGuid(),
            "premium",
            IsActivated: true,
            IsBlocked: false,
            MaxConfigs: 5,
            MaxIpLimit: 3,
            SubscriptionToken: "sub-token",
            BillingEnabled: true,
            BillingPaidUntil: paidUntil,
            BillingSuspended: false
        );

    [Fact]
    public async Task Handle_WhenAwaitingPayment_MovesToAwaitingConfirmationAndNotifiesAdmins()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var userId = Guid.NewGuid();
        var request = PaymentRequest.Create(userId, PaymentPeriod.Year, 6000);
        dbContext.PaymentRequests.Add(request);
        await dbContext.SaveChangesAsync(CancellationToken.None);

        var result = await CreateHandler(dbContext, userId)
            .Handle(new MarkPaymentSentCommand(request.Id), CancellationToken.None);

        Assert.True(result.IsSuccess);
        Assert.Equal(PaymentRequestStatus.AwaitingConfirmation, request.Status);
        await _telegramNotifier
            .Received(1)
            .NotifyAdminsPaymentRequestedAsync(
                request.Id,
                Arg.Any<string>(),
                PaymentRequestKind.Subscription,
                PaymentPeriod.Year,
                6000,
                Arg.Any<CancellationToken>()
            );
    }

    [Fact]
    public async Task Handle_WhenAlreadyAwaitingConfirmation_ReturnsNotAwaitingPayment()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var userId = Guid.NewGuid();
        var request = PaymentRequest.Create(userId, PaymentPeriod.Year, 6000);
        request.MarkPaymentSent();
        dbContext.PaymentRequests.Add(request);
        await dbContext.SaveChangesAsync(CancellationToken.None);

        var result = await CreateHandler(dbContext, userId)
            .Handle(new MarkPaymentSentCommand(request.Id), CancellationToken.None);

        Assert.False(result.IsSuccess);
        Assert.Equal(BillingErrors.RequestNotAwaitingPayment, result.Error);
    }

    [Fact]
    public async Task Handle_WhenPaidUntilAlreadyExpired_ProtectsConfigsOnPanel()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var userId = Guid.NewGuid();

        var node = Node.Register(
            "node-1",
            new Uri("https://node1.example.com"),
            new NodeCredentials("admin", "protected"),
            null
        );
        var inbound = Inbound.FromRemote(node.Id, "1", VpnProtocol.Vless, "remark", 443);
        var config = Domain.Configs.VpnConfig.Create(userId, inbound.Id, VpnProtocol.Vless, null);
        config.AssignRemoteClient("ext-1");
        dbContext.Nodes.Add(node);
        dbContext.Inbounds.Add(inbound);
        dbContext.VpnConfigs.Add(config);

        var request = PaymentRequest.Create(userId, PaymentPeriod.Quarter, 1500);
        dbContext.PaymentRequests.Add(request);
        await dbContext.SaveChangesAsync(CancellationToken.None);

        _identityService
            .GetProfileAsync(userId, Arg.Any<CancellationToken>())
            .Returns(Profile(userId, paidUntil: DateTimeOffset.UtcNow.AddDays(-1)));
        _gateway
            .UpdateClientAsync(
                Arg.Any<Node>(),
                Arg.Any<string>(),
                Arg.Any<string>(),
                Arg.Any<VpnProtocol>(),
                Arg.Any<string>(),
                Arg.Any<bool?>(),
                Arg.Any<DateTimeOffset?>(),
                Arg.Any<CancellationToken>()
            )
            .Returns(Result.Success());

        var result = await CreateHandler(dbContext, userId)
            .Handle(new MarkPaymentSentCommand(request.Id), CancellationToken.None);

        Assert.True(result.IsSuccess);
        // enable:true — держим клиента рабочим на панели, пока заявка на проверке; expiresAt всегда
        // сбрасывается в "без срока" (см. BillingConfigResumer.NoExpiry), истечение — только локально.
        await _gateway
            .Received(1)
            .UpdateClientAsync(
                Arg.Any<Node>(),
                inbound.RemoteInboundId,
                "ext-1",
                VpnProtocol.Vless,
                Arg.Any<string>(),
                true,
                Arg.Is<DateTimeOffset?>(d => d == DateTimeOffset.UnixEpoch),
                Arg.Any<CancellationToken>()
            );
        await _notifier.Received(1).NotifyBillingStatusChangedAsync(userId, Arg.Any<CancellationToken>());
    }

    [Fact]
    public async Task Handle_WhenPaidUntilStillInFuture_DoesNotTouchGateway()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var userId = Guid.NewGuid();
        var request = PaymentRequest.Create(userId, PaymentPeriod.Quarter, 1500);
        dbContext.PaymentRequests.Add(request);
        await dbContext.SaveChangesAsync(CancellationToken.None);

        _identityService
            .GetProfileAsync(userId, Arg.Any<CancellationToken>())
            .Returns(Profile(userId, paidUntil: DateTimeOffset.UtcNow.AddDays(10)));

        var result = await CreateHandler(dbContext, userId)
            .Handle(new MarkPaymentSentCommand(request.Id), CancellationToken.None);

        Assert.True(result.IsSuccess);
        await _gateway
            .DidNotReceive()
            .UpdateClientAsync(
                Arg.Any<Node>(),
                Arg.Any<string>(),
                Arg.Any<string>(),
                Arg.Any<VpnProtocol>(),
                Arg.Any<string>(),
                Arg.Any<bool?>(),
                Arg.Any<DateTimeOffset?>(),
                Arg.Any<CancellationToken>()
            );
    }
}