AMessanger-Avalonia-Client/AMessanger/ViewModels/MainViewModel.cs

using AMessanger.Models;
using AMessanger.Services;
using Avalonia.Threading;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using System.Collections.ObjectModel;
using System.Windows.Input;

namespace AMessanger.ViewModels;

public partial class MainViewModel : ViewModelBase
{
    [ObservableProperty]
    public partial ObservableCollection<Message> Messages { get; private set; } = new();

    [ObservableProperty]
    public partial string Message { get; set; } = string.Empty;

    [ObservableProperty]
    public partial string UserName { get; set; } = "Test user";

    public ICommand SendButtonCommand { get; private set; }

    private readonly ChatService _chat;

    public MainViewModel(ChatService chatService)
    {
        _chat = chatService;
        _chat.OnMessageRecieved += OnMessageRecived;

        SendButtonCommand = new RelayCommand(SendMessage);
    }

    private void OnMessageRecived(Message message)
    {
        Dispatcher.UIThread.Post(() => Messages.Add(message));
    }

    private void SendMessage()
    {
        if (string.IsNullOrWhiteSpace(Message))
            return;

        _chat.SendMessageAsync(new Message(UserName, Message.Trim()));
        Message = string.Empty;
    }
}