using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.Windows.Input;
using DesktopBot.Models;

namespace DesktopBot.ViewModels
{
    /// <summary>
    /// Base ViewModel con implementazione INotifyPropertyChanged
    /// </summary>
    public class BaseViewModel : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        protected bool SetProperty<T>(ref T field, T value, [CallerMemberName] string propertyName = null)
        {
            if (Equals(field, value))
                return false;

            field = value;
            OnPropertyChanged(propertyName);
            return true;
        }
    }

    /// <summary>
    /// Implementazione semplice di ICommand
    /// </summary>
    public class RelayCommand : ICommand
    {
        private readonly Action<object> _execute;
        private readonly Func<object, bool> _canExecute;

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

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

        public bool CanExecute(object parameter) => _canExecute == null || _canExecute(parameter);

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

    /// <summary>
    /// Command senza parametri
    /// </summary>
    public class RelayCommand<T> : ICommand
    {
        private readonly Action<T> _execute;
        private readonly Func<T, bool> _canExecute;

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

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

        public bool CanExecute(object parameter) => _canExecute == null || _canExecute((T)parameter);

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