using System;
using System.Threading.Tasks;
using AsyncAwaitBestPractices;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using StabilityMatrix.Avalonia.Models;

namespace StabilityMatrix.Avalonia.ViewModels.Base;

public partial class ViewModelBase : ObservableValidator, IRemovableListItem
{
    private WeakEventManager? parentListRemoveRequestedEventManager;

    public event EventHandler ParentListRemoveRequested
    {
        add
        {
            parentListRemoveRequestedEventManager ??= new WeakEventManager();
            parentListRemoveRequestedEventManager.AddEventHandler(value);
        }
        remove => parentListRemoveRequestedEventManager?.RemoveEventHandler(value);
    }

    [RelayCommand]
    protected void RemoveFromParentList() =>
        parentListRemoveRequestedEventManager?.RaiseEvent(
            this,
            EventArgs.Empty,
            nameof(ParentListRemoveRequested)
        );

    public virtual void OnLoaded() { }

    public virtual Task OnLoadedAsync()
    {
        return Task.CompletedTask;
    }

    public virtual void OnUnloaded() { }

    public virtual Task OnUnloadedAsync()
    {
        return Task.CompletedTask;
    }
}