using System;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.Windows.Input;

namespace HMI.UI.Entity
{

    public class RelayCommand<T> : ICommand
    {
        /// <summary>
        /// 命令能否执行
        /// </summary>
        readonly Func<bool> _canExecute;
        /// <summary>
        /// 命令执行的方法
        /// </summary>
        readonly Action<T> _execute;

        /// <summary>
        /// 命令的构造函数
        /// </summary>
        /// <param name="action">命令需执行的方法</param>
        /// <param name="canExecute">命令是否可以执行的方法</param>
        public RelayCommand(Action<T> action, Func<bool> canExecute)
        {
            _execute = action;
            _canExecute = canExecute;
        }

        public RelayCommand(Action<T> action)
        {
            _execute = action;
        }

        /// <summary>
        /// 判断命令是否可以执行
        /// </summary>
        /// <param name="parameter"></param>
        /// <returns></returns>
        public bool CanExecute(Object parameter)
        {
            if (_canExecute == null)
                return true;
            return _canExecute();
        }

        /// <summary>
        /// 执行命令
        /// </summary>
        /// <param name="parameter"></param>
        public void Execute(Object parameter)
        {
            _execute((T)parameter);
        }

        /// <summary>
        /// 事件追加、移除
        /// </summary>
        public event EventHandler CanExecuteChanged
        {
            add
            {
                if (_canExecute != null)
                    CommandManager.RequerySuggested += value;
            }
            remove
            {
                if (_canExecute != null)
                    CommandManager.RequerySuggested -= value;
            }
        }

    }

    public class NotifyBase : INotifyPropertyChanged
    {
        #region ...
        public virtual event PropertyChangedEventHandler PropertyChanged;

        protected virtual void RaisePropertyChanged(string name)
        {

            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
        }

        protected void RaiseAndSetIfChanged<T>(ref T old, T @new, [CallerMemberName] string propertyName = null)
        {
            old = @new;
            if (propertyName != null)
            {
                RaisePropertyChanged(propertyName);
            }
        }
        #endregion
    }
}