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 UnblockUserCommandHandlerTests
{
    private readonly IIdentityService _identityService = Substitute.For<IIdentityService>();
    private readonly IXuiPanelGateway _gateway = Substitute.For<IXuiPanelGateway>();
    private readonly IRealtimeNotifier _notifier = Substitute.For<IRealtimeNotifier>();
    private readonly ICurrentUser _currentUser = Substitute.For<ICurrentUser>();
    private readonly ILogger<UnblockUserCommandHandler> _logger = Substitute.For<
        ILogger<UnblockUserCommandHandler>
    >();

    [Fact]
    public async Task Handle_WhenUnblockSucceeds_ReEnablesDisabledConfigsAndWritesAudit()
    {
        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");
        config.Disable();

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

        _currentUser.UserId.Returns(adminId);
        _identityService
            .UnblockUserAsync(userId, 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 UnblockUserCommandHandler(
            dbContext,
            _identityService,
            _gateway,
            _notifier,
            _currentUser,
            _logger
        );

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

        Assert.True(result.IsSuccess);
        Assert.Equal(ConfigStatus.Active, config.Status);
        await _gateway
            .Received(1)
            .UpdateClientAsync(
                node,
                inbound.RemoteInboundId,
                config.ClientExternalId,
                config.Protocol,
                Arg.Any<string>(),
                true,
                null,
                Arg.Any<CancellationToken>()
            );
        await _notifier
            .Received(1)
            .NotifyConfigStatusChangedAsync(
                userId,
                config.Id,
                ConfigStatus.Active,
                Arg.Any<CancellationToken>()
            );
        Assert.Single(dbContext.AuditLogs.Local);
        Assert.Equal("UserUnblocked", dbContext.AuditLogs.Local.Single().Action);
    }

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

        _identityService
            .UnblockUserAsync(userId, Arg.Any<CancellationToken>())
            .Returns(Result.Failure(error));

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

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

        Assert.False(result.IsSuccess);
        Assert.Equal(error, result.Error);
        Assert.Empty(dbContext.AuditLogs);
    }

    [Fact]
    public async Task Handle_GatewayFails_KeepsConfigDisabledForRetryAndDoesNotNotify()
    {
        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");
        config.Disable();

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

        _currentUser.UserId.Returns(adminId);
        _identityService
            .UnblockUserAsync(userId, 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.Failure(Error.Failure("Xui.UpdateClientFailed", "Нода недоступна.")));

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

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

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