using TeamsISO.Engine.Controller;
using TeamsISO.Engine.Domain;

namespace TeamsISO.App.ViewModels;

/// <summary>
/// Per-row view model for a participant in the participant list.
/// Wraps a domain <see cref="Participant"/> and exposes ISO toggle and naming commands.
/// </summary>
public sealed class ParticipantViewModel : ObservableObject
{
    private readonly IIsoController _controller;
    private Participant _participant;
    private bool _isEnabled;
    private bool _isProcessing;
    private string _customName;

    public ParticipantViewModel(IIsoController controller, Participant participant)
    {
        _controller = controller;
        _participant = participant;
        _customName = string.Empty;
        ToggleIsoCommand = new AsyncRelayCommand(ToggleIsoAsync, () => !_isProcessing);
    }

    public Guid Id => _participant.Id;
    public string DisplayName => _participant.DisplayName;
    public string SourceMachine => _participant.CurrentSource?.MachineName ?? "(disconnected)";
    public string SourceFullName => _participant.CurrentSource?.FullName ?? "(disconnected)";
    public bool IsOnline => _participant.CurrentSource is not null;

    public bool IsEnabled
    {
        get => _isEnabled;
        set => SetField(ref _isEnabled, value);
    }

    public bool IsProcessing
    {
        get => _isProcessing;
        private set
        {
            if (SetField(ref _isProcessing, value))
                ToggleIsoCommand.RaiseCanExecuteChanged();
        }
    }

    public string CustomName
    {
        get => _customName;
        set => SetField(ref _customName, value);
    }

    public AsyncRelayCommand ToggleIsoCommand { get; }

    /// <summary>Refreshes the underlying participant data (called when the controller emits an updated list).</summary>
    public void Update(Participant updated)
    {
        _participant = updated;
        OnPropertyChanged(nameof(DisplayName));
        OnPropertyChanged(nameof(SourceMachine));
        OnPropertyChanged(nameof(SourceFullName));
        OnPropertyChanged(nameof(IsOnline));
    }

    private async Task ToggleIsoAsync()
    {
        IsProcessing = true;
        try
        {
            if (IsEnabled)
            {
                await _controller.DisableIsoAsync(Id, CancellationToken.None);
                IsEnabled = false;
            }
            else
            {
                await _controller.EnableIsoAsync(
                    Id,
                    string.IsNullOrWhiteSpace(_customName) ? null : _customName,
                    CancellationToken.None);
                IsEnabled = true;
            }
        }
        finally
        {
            IsProcessing = false;
        }
    }
}