ActiveConversationService.cs

namespace KaiChat.Services;

public interface IActiveConversationService
{
    void SetActive(string conversationId);
    string? GetActiveConversationId();
}

public sealed class ActiveConversationService : IActiveConversationService
{
    private readonly object _gate = new();
    private string? _conversationId;

    public void SetActive(string conversationId)
    {
        if (string.IsNullOrWhiteSpace(conversationId))
            return;

        lock (_gate)
        {
            _conversationId = conversationId;
        }
    }

    public string? GetActiveConversationId()
    {
        lock (_gate)
        {
            return _conversationId;
        }
    }
}