Relay/RelayClient/ChatSimulator.cs

namespace RelayClient;

public static class ChatSimulator
{
    public static event Action<ChatMessage>? MessageSent;

    public static void Send(string senderUsername, string text)
    {
        var message = new ChatMessage
        {
            SenderUsername = senderUsername,
            Text = text,
            Timestamp = DateTime.Now
        };

        MessageSent?.Invoke(message);
    }
}

public sealed class ChatMessage
{
    public required string SenderUsername { get; set; }
    public required string Text { get; set; }
    public required DateTime Timestamp { get; set; }
}