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 RejectPaymentRequestCommandHandlerTests
{
    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<RejectPaymentRequestCommandHandler> _logger = Substitute.For<
        ILogger<RejectPaymentRequestCommandHandler>
    >();

    private RejectPaymentRequestCommandHandler CreateHandler(IAppDbContext dbContext, Guid adminId) =>
        new(
            dbContext,
            _identityService,
            _gateway,
            _notifier,
            _telegramNotifier,
            FakeCurrentUser.Authenticated(adminId, "admin"),
            _logger
        );

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

    [Fact]
    public async Task Handle_WhenAwaitingConfirmation_RejectsAndNotifiesUser()
    {
        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);

        var result = await CreateHandler(dbContext, adminId)
            .Handle(new RejectPaymentRequestCommand(request.Id, "Платёж не найден"), CancellationToken.None);

        Assert.True(result.IsSuccess);
        Assert.Equal(PaymentRequestStatus.Rejected, request.Status);
        Assert.Equal("Платёж не найден", request.RejectionReason);
        await _telegramNotifier
            .Received(1)
            .NotifyUserAsync(
                userId,
                Arg.Is<string>(m => m!.Contains("Платёж не найден")),
                Arg.Any<string?>(),
                Arg.Any<CancellationToken>()
            );
    }

    [Fact]
    public async Task Handle_WhenRequestNotFound_ReturnsRequestNotFound()
    {
        using var dbContext = InMemoryDbContextFactory.Create();

        var result = await CreateHandler(dbContext, Guid.NewGuid())
            .Handle(new RejectPaymentRequestCommand(Guid.NewGuid(), null), CancellationToken.None);

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

    [Fact]
    public async Task Handle_WhenStillUnpaidAndNoOtherPendingRequest_SuspendsConfigsImmediately()
    {
        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 config = 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);
        request.MarkPaymentSent();
        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, adminId)
            .Handle(new RejectPaymentRequestCommand(request.Id, null), CancellationToken.None);

        Assert.True(result.IsSuccess);
        Assert.Equal(ConfigStatus.Expired, config.Status);
        // enable:false — истечение управляется полностью на нашей стороне, панельный expiresAt
        // сбрасывается в "без срока" (см. BillingConfigResumer.NoExpiry), не реальную просроченную дату.
        await _gateway
            .Received(1)
            .UpdateClientAsync(
                Arg.Any<Node>(),
                inbound.RemoteInboundId,
                "ext-1",
                VpnProtocol.Vless,
                Arg.Any<string>(),
                false,
                Arg.Is<DateTimeOffset?>(d => d == DateTimeOffset.UnixEpoch),
                Arg.Any<CancellationToken>()
            );
        // Фронт (/billing) должен узнать о смене статуса сразу, не дожидаясь опроса.
        await _notifier.Received(1).NotifyBillingStatusChangedAsync(userId, Arg.Any<CancellationToken>());
    }

    [Fact]
    public async Task Handle_WhenAnotherSubscriptionRequestStillPending_DoesNotSuspend()
    {
        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 config = 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);
        request.MarkPaymentSent();
        var otherRequest = PaymentRequest.Create(userId, PaymentPeriod.Quarter, 1500);
        otherRequest.MarkPaymentSent();
        dbContext.PaymentRequests.AddRange(request, otherRequest);
        await dbContext.SaveChangesAsync(CancellationToken.None);

        _identityService
            .GetProfileAsync(userId, Arg.Any<CancellationToken>())
            .Returns(Profile(userId, paidUntil: DateTimeOffset.UtcNow.AddDays(-1)));

        var result = await CreateHandler(dbContext, adminId)
            .Handle(new RejectPaymentRequestCommand(request.Id, null), CancellationToken.None);

        Assert.True(result.IsSuccess);
        Assert.Equal(ConfigStatus.Active, config.Status);
        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>()
            );
    }
}