using System;
using System.Windows.Input;

namespace ytLive.Helpers;

public class RelayCommand<T> : ICommand
{
    private readonly Action<T?> _execute;
    private readonly Predicate<T?>? _canExecute;

    public RelayCommand(Action<T?> execute, Predicate<T?>? canExecute = null)
    {
        _execute = execute;
        _canExecute = canExecute;
    }

    public event EventHandler? CanExecuteChanged
    {
        add => CommandManager.RequerySuggested += value;
        remove => CommandManager.RequerySuggested -= value;
    }

    public bool CanExecute(object? parameter)
    {
        if (parameter is T t) return _canExecute?.Invoke(t) ?? true;
        return _canExecute?.Invoke(default) ?? true;
    }

    public void Execute(object? parameter)
    {
        if (parameter is T t) _execute(t);
        else _execute(default);
    }
}