using System;
using System.Windows.Input;

namespace IOTContainer.MvvmBase
{
    /// <summary>
    /// 命令基础类
    /// </summary>
    public class CommandBase : ICommand
    {
        #region 字段属性
        /// <summary>
        /// 事件
        /// </summary>
        private Action<object> _action;

        /// <summary>
        /// 判断可执行方法
        /// </summary>
        private Predicate<object> _canExecuteFunc;
        #endregion

        #region 对外方法
        /// <summary>
        /// 初始化事件
        /// </summary>
        /// <param name="action"></param>
        public CommandBase(Action<object> action)
        {
            this._action = action;
        }

        public CommandBase(Action<object> action, Predicate<object> canExecuteFunc)
        {
            this._action = action;
            this._canExecuteFunc = canExecuteFunc;
        }

        /// <summary>
        /// 执行事件
        /// </summary>
        /// <param name="parameter"></param>
        public void Execute(object parameter)
        {
            this._action?.Invoke(parameter);
        }

        /// <summary>
        /// 执行改变事件
        /// </summary>
        public event EventHandler CanExecuteChanged
        {
            add { CommandManager.RequerySuggested += value; }
            remove { CommandManager.RequerySuggested -= value; }
        }
        /// <summary>
        /// 执行改变
        /// </summary>
        /// <param name="parameter"></param>
        /// <returns></returns>
        public bool CanExecute(object parameter)
        {
            return this._canExecuteFunc?.Invoke(parameter) != false;
        }
        #endregion
    }
}