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 DeleteUserCommandHandlerTests
{
    private readonly IIdentityService _identityService = Substitute.For<IIdentityService>();
    private readonly IXuiPanelGateway _gateway = Substitute.For<IXuiPanelGateway>();
    private readonly ITelegramNotifier _telegramNotifier = Substitute.For<ITelegramNotifier>();
    private readonly ICurrentUser _currentUser = Substitute.For<ICurrentUser>();
    private readonly ILogger<DeleteUserCommandHandler> _logger = Substitute.For<
        ILogger<DeleteUserCommandHandler>
    >();

    [Fact]
    public async Task Handle_WhenAdminTargetsSelf_ReturnsCannotDeleteSelfWithoutTouchingConfigs()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var adminId = Guid.NewGuid();
        _currentUser.UserId.Returns(adminId);

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

        var result = await handler.Handle(new DeleteUserCommand(adminId), CancellationToken.None);

        Assert.False(result.IsSuccess);
        Assert.Equal(UserErrors.CannotDeleteSelf, result.Error);
        await _identityService
            .DidNotReceive()
            .DeleteUserAsync(Arg.Any<Guid>(), Arg.Any<CancellationToken>());
    }

    [Fact]
    public async Task Handle_Success_RevokesConfigsWritesAuditNotifiesThenDeletesUser()
    {
        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.AssignRemoteClient("external-id");

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

        _currentUser.UserId.Returns(adminId);
        _gateway
            .RemoveClientAsync(
                Arg.Any<Node>(),
                Arg.Any<string>(),
                Arg.Any<string>(),
                Arg.Any<VpnProtocol>(),
                Arg.Any<CancellationToken>()
            )
            .Returns(Result.Success());
        _identityService
            .DeleteUserAsync(userId, Arg.Any<CancellationToken>())
            .Returns(Result.Success());

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

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

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

        await _gateway
            .Received(1)
            .RemoveClientAsync(
                Arg.Is<Node>(n => n.Id == node.Id),
                inbound.RemoteInboundId,
                "external-id",
                config.Protocol,
                Arg.Any<CancellationToken>()
            );
        await _telegramNotifier
            .Received(1)
            .NotifyUserAsync(userId, Arg.Any<string>(), Arg.Any<string?>(), Arg.Any<CancellationToken>());
        await _identityService.Received(1).DeleteUserAsync(userId, Arg.Any<CancellationToken>());

        var audit = Assert.Single(dbContext.AuditLogs.Local);
        Assert.Equal("UserDeleted", audit.Action);
        Assert.Equal(adminId, audit.ActorId);
        Assert.Equal(userId.ToString(), audit.TargetId);
    }

    [Fact]
    public async Task Handle_NoConfigs_SkipsGatewayButStillDeletesUser()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var userId = Guid.NewGuid();
        _currentUser.UserId.Returns(Guid.NewGuid());
        _identityService
            .DeleteUserAsync(userId, Arg.Any<CancellationToken>())
            .Returns(Result.Success());

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

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

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

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

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

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

        Assert.False(result.IsSuccess);
        Assert.Equal(UserErrors.NotFound, result.Error);
    }
}