using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;

namespace WpfApp1TRC20.ViewModels
{
    public class RelayCommand : ICommand
    {
        private readonly Func<Task> _execute;
        private readonly Func<bool> _canExecute;

        public RelayCommand(Func<Task> execute, Func<bool> canExecute = null)
        {
            _execute = execute ?? throw new ArgumentNullException(nameof(execute));
            _canExecute = canExecute;
        }

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

        public bool CanExecute(object parameter) => _canExecute?.Invoke() ?? true;

        public async void Execute(object parameter) => await _execute();
    }
}