using Luna.Channels.Abstractions;
using Luna.Channels.Tests.Stubs;
using Luna.Core.Abstractions;
using Luna.Shared;
using Microsoft.Extensions.Logging;
using Moq;

namespace Luna.Channels.Tests;

[TestFixture]
[Category("Unit")]
public class ChannelManagerInterfaceTests
{
    private readonly Mock<ILogger<ChannelManager>> loggerMock = new();
    
    [Test]
    public void RegisterChannel_And_GetChannel_Returns_It()
    {
        var sessionManagerMock = new Mock<ISessionManager>();
        var stub = new ChannelManager(sessionManagerMock.Object, loggerMock.Object);
        var mockChannel = new Mock<IChannel>();
        mockChannel.Setup(c => c.ChannelId).Returns("test-1");

        stub.RegisterChannel(mockChannel.Object);
        var result = stub.GetChannel("test-1");

        Assert.That(result, Is.EqualTo(mockChannel.Object));
    }

    [Test]
    public void RegisterChannel_Duplicate_Id_Throws()
    {
        var sessionManagerMock = new Mock<ISessionManager>();
        var stub = new ChannelManager(sessionManagerMock.Object, loggerMock.Object);
        var mockChannel = new Mock<IChannel>();
        mockChannel.Setup(c => c.ChannelId).Returns("dup-1");

        stub.RegisterChannel(mockChannel.Object);

        Assert.That(() => stub.RegisterChannel(mockChannel.Object),
            Throws.TypeOf<InvalidOperationException>());
    }

    [Test]
    public void UnregisterChannel_Removes_Channel()
    {
        var sessionManagerMock = new Mock<ISessionManager>();
        var stub = new ChannelManager(sessionManagerMock.Object, loggerMock.Object);
        var mockChannel = new Mock<IChannel>();
        mockChannel.Setup(c => c.ChannelId).Returns("rem-1");

        stub.RegisterChannel(mockChannel.Object);
        stub.UnregisterChannel("rem-1");
        var result = stub.GetChannel("rem-1");

        Assert.That(result, Is.Null);
    }

    [Test]
    public void UnregisterChannel_Unknown_Id_No_Exception()
    {
        var sessionManagerMock = new Mock<ISessionManager>();
        var stub = new ChannelManager(sessionManagerMock.Object, loggerMock.Object);

        Assert.That(() => stub.UnregisterChannel("nonexistent-id"), Throws.Nothing);
    }

    [Test]
    public void GetAllChannels_Returns_All_Registered()
    {
        var sessionManagerMock = new Mock<ISessionManager>();
        var stub = new ChannelManager(sessionManagerMock.Object, loggerMock.Object);
        for (int i = 0; i < 3; i++)
        {
            var mockChannel = new Mock<IChannel>();
            mockChannel.Setup(c => c.ChannelId).Returns($"ch-{i}");
            stub.RegisterChannel(mockChannel.Object);
        }

        var all = stub.GetAllChannels();

        Assert.That(all.Count, Is.EqualTo(3));
    }

    [Test]
    public void MessageRouted_Event_Fires_When_Message_Is_Routed()
    {
        var sessionManagerMock = new Mock<ISessionManager>();
        var stub = new ChannelManager(sessionManagerMock.Object, loggerMock.Object);
        var mockChannel = new Mock<IChannel>();
        mockChannel.Setup(c => c.ChannelId).Returns("event-ch-1");

        ChannelMessageReceivedEventArgs? capturedArgs = null;
        stub.MessageRouted += (_, args) => capturedArgs = args;

        stub.RegisterChannel(mockChannel.Object);

        var message = new ChannelMessage(
            Guid.NewGuid().ToString(),
            Guid.NewGuid().ToString(),
            "sender-1",
            "Sender Name",
            "Hello",
            DateTimeOffset.UtcNow);

        var eventArgs = new ChannelMessageReceivedEventArgs
        {
            Message = message,
            Channel = mockChannel.Object
        };

        Assert.That(capturedArgs, Is.Not.Null);
    }
}