using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Linq.Expressions;
using System.Text;

namespace FWindSoft.Wpf
{
    public class EditableItem : INotifyPropertyChanged,IEditableObject
    {
        public EditableItem()
        {
            IsEdited = false;
            NewAdd = false;
            IsListenEditing = false;
        }

        #region 实现INotifyPropertyChanged
        public event PropertyChangedEventHandler PropertyChanged = (sender, e) => { };

       

        protected virtual void RaisePropertyChanged(String propertyName = "")
        {
            if (IsListenEditing)
            {
                this.IsEdited = true;
            }
            if (PropertyChanged != null)
            {

                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }
        protected void RaisePropertyChanged<T>(Expression<Func<T>> propertyExpression)
        {
            if (null != propertyExpression)
            {
                var memberExpression = propertyExpression.Body as MemberExpression;
                if (memberExpression != null)
                    RaisePropertyChanged(memberExpression.Member.Name);              
            }
            else
            {
                throw new ArgumentNullException("propertyExpression");
            }

        }
        #endregion

        #region 实现EditableObject,UI驱动数据
        private bool m_TempEdit;
        public virtual void BeginEdit()
        {
            if (IsListenEditing)
            {
                m_TempEdit=IsEdited;
                //IsEdited = true;
            }          
        }
        public virtual void CancelEdit()
        {
            if (IsListenEditing)
            {
                IsEdited = m_TempEdit;
            }
        }
        public virtual void EndEdit()
        {
            if (IsListenEditing&&!IsEdited)
            {
                this.IsEdited = true;
            }
        }

        #endregion
        /// <summary>
        /// 在集合中标志元素是否是新添加的
        /// </summary>
        public bool NewAdd { get; set; }
        /// <summary>
        /// 数据是否经过了编辑,状态仅由内部维护【当前类型数据，基础类元素，不包括关联类型元素的编辑状态】
        /// </summary>
        public bool IsEdited { get;private set; }
        /// <summary>
        /// 是否监控数据的编辑状态
        /// </summary>
        public bool IsListenEditing { get; set; }

        /// <summary>
        /// 设置数据是否处于编辑状态
        /// </summary>
        /// <param name="isEdited"></param>
        public void SetEditedState(bool isEdited)
        {
            this.IsEdited = IsEdited;
        }
        /// <summary>
        /// 是否处于编辑状态【包括关联的对象的编辑状态】
        /// </summary>
        /// <returns></returns>
        public virtual bool GetEditedState()
        {
            if (IsEdited)
                return true;
            var currentType = this.GetType();
            var properties = currentType.GetProperties();
            foreach (var propertyInfo in properties)
            {
                if (propertyInfo.PropertyType != typeof(EditableItem))
                    continue;
                EditableItem edit = propertyInfo.GetValue(this) as EditableItem;
                if (edit != null && edit.GetEditedState())
                    return true;
            }
            return false;

        }
    }
}