using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using TwinCAT.TypeSystem;
using Heisig.HMI.AdsManager;

namespace HMIToolkit;

public sealed partial class HMIControlButtonVM : ObservableObject, IDisposable
{
	private IAdsManager? _adsManager;
	private readonly string _variableName;

	// Action triggered when the button is about to be clicked
	public event EventHandler? ButtonClickedStarted;

	// Action triggered when the button is done being clicked
	public event EventHandler? ButtonClickedEnded;

	// Event when button feedback changed
	public event EventHandler? FeedbackChanged;

	// Event when release changed
	public event EventHandler? ReleaseChanged;

	[ObservableProperty]
	private bool xRelease;

	// 0 = none, 1 = active, 2 = pending, 3 = waring, 4 = error
	[ObservableProperty]
	private short iFeedback;

	public HMIControlButtonVM()
	{
		_variableName = string.Empty;
		XRelease = false;
		IFeedback = 4;
	}

	public HMIControlButtonVM(IAdsManager adsManager, string variableName)
	{
		_adsManager = adsManager;
		_variableName = variableName;

		_adsManager.Register(_variableName + ".xRelease", XReleaseCahnged);
		_adsManager.Register(_variableName + ".eFeedback", IFeedbackChanged);
	}

	public void Dispose()
	{
		_adsManager?.Deregister(_variableName + ".xRelease", XReleaseCahnged);
		_adsManager?.Deregister(_variableName + ".eFeedback", IFeedbackChanged);
	}

	[RelayCommand]
	private void ButtonClicked()
	{
		ButtonClickedStarted?.Invoke(this, EventArgs.Empty);
		_adsManager?.WriteValue(_variableName + ".xRequest", true);
		ButtonClickedEnded?.Invoke(this, EventArgs.Empty);
	}

	private void XReleaseCahnged(object? sender, ValueChangedEventArgs e)
	{
		XRelease = (bool)e.Value;
		ReleaseChanged?.Invoke(this, EventArgs.Empty);
	}

	private void IFeedbackChanged(object? sender, ValueChangedEventArgs e)
	{
		IFeedback = (short)e.Value;
		FeedbackChanged?.Invoke(this, EventArgs.Empty);
	}
}