using System;
using System.Windows.Input;

namespace Remotely.Agent.Installer.Win.Services
{
    public class RelayCommand : ICommand
    {
        private readonly Action<object> _action;

        private readonly Predicate<object> _canExecute;

        public RelayCommand(Action<object> action, Predicate<object> canExecute = null)
        {
            _action = action;
            _canExecute = canExecute;
        }

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

        public bool CanExecute(object parameter)
        {
            if (_canExecute is null)
            {
                return true;
            }
            return _canExecute.Invoke(parameter);
        }

        public void Execute(object parameter)
        {
            _action?.Invoke(parameter);
        }
    }
}
