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

namespace PnvPanel.Application.Tests.Admin.Users;

public class BlockUserCommandHandlerTests
{
    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 ICurrentUser _currentUser = Substitute.For<ICurrentUser>();
    private readonly ILogger<BlockUserCommandHandler> _logger = Substitute.For<
        ILogger<BlockUserCommandHandler>
    >();

    [Fact]
    public async Task Handle_IdentityServiceFails_ReturnsFailureWithoutTouchingConfigs()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var userId = Guid.NewGuid();
        var failure = UserErrors.NotFound;
        _identityService
            .BlockUserAsync(userId, Arg.Any<CancellationToken>())
            .Returns(Result.Failure(failure));

        var handler = new BlockUserCommandHandler(
            dbContext,
            _identityService,
            _gateway,
            _notifier,
            _telegramNotifier,
            _currentUser,
            _logger
        );

        var result = await handler.Handle(new BlockUserCommand(userId), CancellationToken.None);

        Assert.False(result.IsSuccess);
        Assert.Equal(failure, result.Error);
        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>()
            );
    }

    [Fact]
    public async Task Handle_Success_DisablesActiveConfigsAndWritesAudit()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var userId = Guid.NewGuid();
        var adminId = 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, "my-config");

        dbContext.Nodes.Add(node);
        dbContext.Inbounds.Add(inbound);
        dbContext.VpnConfigs.Add(config);
        await dbContext.SaveChangesAsync(CancellationToken.None);

        _identityService
            .BlockUserAsync(userId, Arg.Any<CancellationToken>())
            .Returns(Result.Success());
        _currentUser.UserId.Returns(adminId);
        _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 BlockUserCommandHandler(
            dbContext,
            _identityService,
            _gateway,
            _notifier,
            _telegramNotifier,
            _currentUser,
            _logger
        );

        var result = await handler.Handle(new BlockUserCommand(userId), CancellationToken.None);

        Assert.True(result.IsSuccess);
        Assert.Equal(ConfigStatus.Disabled, config.Status);

        // name: null — блокировка не переименовывает клиента; expiresAt: null — блокировка не трогает
        // срок оплаты (см. IXuiPanelGateway.UpdateClientAsync).
        await _gateway
            .Received(1)
            .UpdateClientAsync(
                Arg.Is<Node>(n => n!.Id == node.Id),
                inbound.RemoteInboundId,
                config.ClientExternalId,
                config.Protocol,
                null,
                enable: false,
                expiresAt: null,
                Arg.Any<CancellationToken>()
            );
        await _notifier
            .Received(1)
            .NotifyConfigStatusChangedAsync(
                userId,
                config.Id,
                ConfigStatus.Disabled,
                Arg.Any<CancellationToken>()
            );

        var audit = Assert.Single(dbContext.AuditLogs.Local);
        Assert.Equal("UserBlocked", audit.Action);
        Assert.Equal(adminId, audit.ActorId);
    }

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

        _identityService
            .BlockUserAsync(userId, Arg.Any<CancellationToken>())
            .Returns(Result.Success());
        _currentUser.UserId.Returns(Guid.NewGuid());

        var handler = new BlockUserCommandHandler(
            dbContext,
            _identityService,
            _gateway,
            _notifier,
            _telegramNotifier,
            _currentUser,
            _logger
        );

        var result = await handler.Handle(new BlockUserCommand(userId), 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>()
            );
    }

    [Fact]
    public async Task Handle_GatewayFails_KeepsConfigActiveForRetryAndDoesNotNotify()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var userId = Guid.NewGuid();
        var adminId = 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, "my-config");

        dbContext.Nodes.Add(node);
        dbContext.Inbounds.Add(inbound);
        dbContext.VpnConfigs.Add(config);
        await dbContext.SaveChangesAsync(CancellationToken.None);

        _identityService
            .BlockUserAsync(userId, Arg.Any<CancellationToken>())
            .Returns(Result.Success());
        _currentUser.UserId.Returns(adminId);
        _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.Failure(Error.Failure("Xui.UpdateClientFailed", "Нода недоступна.")));

        var handler = new BlockUserCommandHandler(
            dbContext,
            _identityService,
            _gateway,
            _notifier,
            _telegramNotifier,
            _currentUser,
            _logger
        );

        var result = await handler.Handle(new BlockUserCommand(userId), CancellationToken.None);

        Assert.True(result.IsSuccess);
        Assert.Equal(ConfigStatus.Active, config.Status);
        await _notifier
            .DidNotReceive()
            .NotifyConfigStatusChangedAsync(
                Arg.Any<Guid>(),
                Arg.Any<Guid>(),
                Arg.Any<ConfigStatus>(),
                Arg.Any<CancellationToken>()
            );
    }
}