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

namespace PnvPanel.Application.Tests.Admin.Billing;

public class ConfirmPaymentRequestCommandHandlerTests
{
    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<ConfirmPaymentRequestCommandHandler> _logger = Substitute.For<
        ILogger<ConfirmPaymentRequestCommandHandler>
    >();

    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: paidUntil is null
        );

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

        _identityService
            .GetProfileAsync(userId, Arg.Any<CancellationToken>())
            .Returns(Profile(userId, paidUntil: null));
        _identityService
            .ExtendBillingPaidUntilAsync(userId, Arg.Any<DateTimeOffset>(), Arg.Any<CancellationToken>())
            .Returns(Result.Success());

        var handler = new ConfirmPaymentRequestCommandHandler(
            dbContext,
            _identityService,
            _gateway,
            _notifier,
            _telegramNotifier,
            FakeCurrentUser.Authenticated(adminId, "admin"),
            _logger
        );

        var before = DateTimeOffset.UtcNow;
        var result = await handler.Handle(
            new ConfirmPaymentRequestCommand(request.Id),
            CancellationToken.None
        );

        Assert.True(result.IsSuccess);
        Assert.Equal(PaymentRequestStatus.Confirmed, request.Status);
        await _identityService
            .Received(1)
            .ExtendBillingPaidUntilAsync(
                userId,
                Arg.Is<DateTimeOffset>(d => d >= before.AddMonths(3).AddMinutes(-1)),
                Arg.Any<CancellationToken>()
            );
    }

    [Fact]
    public async Task Handle_WhenPaidUntilInFuture_ExtendsFromExistingPaidUntil()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var adminId = Guid.NewGuid();
        var userId = Guid.NewGuid();
        var existingPaidUntil = DateTimeOffset.UtcNow.AddDays(20);
        var request = PaymentRequest.Create(userId, PaymentPeriod.Quarter, 1500);
        request.MarkPaymentSent();
        dbContext.PaymentRequests.Add(request);
        await dbContext.SaveChangesAsync(CancellationToken.None);

        _identityService
            .GetProfileAsync(userId, Arg.Any<CancellationToken>())
            .Returns(Profile(userId, paidUntil: existingPaidUntil));
        _identityService
            .ExtendBillingPaidUntilAsync(userId, Arg.Any<DateTimeOffset>(), Arg.Any<CancellationToken>())
            .Returns(Result.Success());

        var handler = new ConfirmPaymentRequestCommandHandler(
            dbContext,
            _identityService,
            _gateway,
            _notifier,
            _telegramNotifier,
            FakeCurrentUser.Authenticated(adminId, "admin"),
            _logger
        );

        await handler.Handle(new ConfirmPaymentRequestCommand(request.Id), CancellationToken.None);

        var expected = existingPaidUntil.AddMonths(3);
        await _identityService
            .Received(1)
            .ExtendBillingPaidUntilAsync(
                userId,
                Arg.Is<DateTimeOffset>(d => Math.Abs((d - expected).TotalSeconds) < 5),
                Arg.Any<CancellationToken>()
            );
    }

    [Fact]
    public async Task Handle_ResumesExpiredConfigsAndSyncsExpiry()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var adminId = Guid.NewGuid();
        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 expiredConfig = VpnConfig.Create(userId, inbound.Id, VpnProtocol.Vless, null);
        expiredConfig.AssignRemoteClient("ext-1");
        expiredConfig.Suspend();
        var activeConfig = VpnConfig.Create(userId, inbound.Id, VpnProtocol.Vless, null);
        activeConfig.AssignRemoteClient("ext-2");

        dbContext.Nodes.Add(node);
        dbContext.Inbounds.Add(inbound);
        dbContext.VpnConfigs.AddRange(expiredConfig, activeConfig);

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

        _identityService
            .GetProfileAsync(userId, Arg.Any<CancellationToken>())
            .Returns(Profile(userId, paidUntil: null));
        _identityService
            .ExtendBillingPaidUntilAsync(userId, Arg.Any<DateTimeOffset>(), Arg.Any<CancellationToken>())
            .Returns(Result.Success());
        _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 handler = new ConfirmPaymentRequestCommandHandler(
            dbContext,
            _identityService,
            _gateway,
            _notifier,
            _telegramNotifier,
            FakeCurrentUser.Authenticated(adminId, "admin"),
            _logger
        );

        var result = await handler.Handle(
            new ConfirmPaymentRequestCommand(request.Id),
            CancellationToken.None
        );

        Assert.True(result.IsSuccess);
        Assert.Equal(ConfigStatus.Active, expiredConfig.Status);
        Assert.NotNull(expiredConfig.ExpiresAt);
        Assert.NotNull(activeConfig.ExpiresAt);
        Assert.Equal(expiredConfig.ExpiresAt, activeConfig.ExpiresAt);
        // enable:true И expiresAt=новый newPaidUntil вместе (см. IXuiPanelGateway.UpdateClientAsync) —
        // и для ранее Expired конфига (ext-1), и для уже Active (ext-2): пользователь мог доплатить
        // заранее, панель должна узнать новый срок сразу, а не только когда конфиг реально просрочится.
        await _gateway
            .Received(1)
            .UpdateClientAsync(
                Arg.Any<Node>(),
                inbound.RemoteInboundId,
                "ext-1",
                VpnProtocol.Vless,
                Arg.Any<string>(),
                true,
                Arg.Is<DateTimeOffset?>(d => d == expiredConfig.ExpiresAt),
                Arg.Any<CancellationToken>()
            );
        await _gateway
            .Received(1)
            .UpdateClientAsync(
                Arg.Any<Node>(),
                inbound.RemoteInboundId,
                "ext-2",
                VpnProtocol.Vless,
                Arg.Any<string>(),
                true,
                Arg.Is<DateTimeOffset?>(d => d == activeConfig.ExpiresAt),
                Arg.Any<CancellationToken>()
            );
        await _notifier.Received(1).NotifyBillingStatusChangedAsync(userId, Arg.Any<CancellationToken>());
    }

    [Fact]
    public async Task Handle_WhenRoleChangeTopUp_ConfirmsWithoutExtendingPaidUntil()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var adminId = Guid.NewGuid();
        var userId = Guid.NewGuid();
        var existingPaidUntil = DateTimeOffset.UtcNow.AddDays(20);
        var request = PaymentRequest.CreateRoleChangeTopUp(userId, 1200);
        request.MarkPaymentSent();
        dbContext.PaymentRequests.Add(request);
        await dbContext.SaveChangesAsync(CancellationToken.None);

        _identityService
            .GetProfileAsync(userId, Arg.Any<CancellationToken>())
            .Returns(Profile(userId, paidUntil: existingPaidUntil));

        var handler = new ConfirmPaymentRequestCommandHandler(
            dbContext,
            _identityService,
            _gateway,
            _notifier,
            _telegramNotifier,
            FakeCurrentUser.Authenticated(adminId, "admin"),
            _logger
        );

        var result = await handler.Handle(
            new ConfirmPaymentRequestCommand(request.Id),
            CancellationToken.None
        );

        Assert.True(result.IsSuccess);
        Assert.Equal(PaymentRequestStatus.Confirmed, request.Status);
        await _identityService
            .DidNotReceive()
            .ExtendBillingPaidUntilAsync(
                Arg.Any<Guid>(),
                Arg.Any<DateTimeOffset>(),
                Arg.Any<CancellationToken>()
            );
    }

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

        var handler = new ConfirmPaymentRequestCommandHandler(
            dbContext,
            _identityService,
            _gateway,
            _notifier,
            _telegramNotifier,
            FakeCurrentUser.Authenticated(adminId, "admin"),
            _logger
        );

        var result = await handler.Handle(
            new ConfirmPaymentRequestCommand(request.Id),
            CancellationToken.None
        );

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