using System.Windows.Input;

namespace Qrakhen.Qamp.Editor.Commands;

public class RelayCommand : ICommand
{
   private readonly Action<object?> _execute;
   private readonly Func<object?, bool> _canExecute;

   public RelayCommand(Action<object?> execute) : this(execute, null) { }

   public RelayCommand(Action<object?> execute, Func<object?, bool>? canExecute)
   {
      _execute = execute ?? throw new ArgumentNullException(nameof(execute));
      _canExecute = canExecute ?? (p => true);
   }

   public RelayCommand(Action execute) : this(p => execute()) { }

   public RelayCommand(Action execute, Func<bool> canExecute) : this(p => execute(), p => canExecute()) { }

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

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

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