using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;

namespace iWare_SCADA_BusinessLogical.Utils
{
    public class EntityPropHelper
    {
        /// <summary>
        /// 反射实现两个类的对象之间相同属性的值的复制
        /// 适用于初始化新实体
        /// </summary>
        /// <typeparam name="D">返回的实体</typeparam>
        /// <typeparam name="S">数据源实体</typeparam>
        /// <param name="s">数据源实体</param>
        /// <returns>返回的新实体</returns>
        public static D Mapper<D, S>(S s)
        {
            D d = Activator.CreateInstance<D>(); //构造新实例
            try
            {
                var Types = s.GetType();//获得类型  
                var Typed = typeof(D);
                foreach (PropertyInfo sp in Types.GetProperties())//获得类型的属性字段  
                {
                    foreach (PropertyInfo dp in Typed.GetProperties())
                    {
                        if (dp.Name == sp.Name && dp.PropertyType == sp.PropertyType && dp.Name != "Error" && dp.Name != "Item")//判断属性名是否相同  
                        {
                            dp.SetValue(d, sp.GetValue(s, null), null);//获得s对象属性的值复制给d对象的属性  
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            return d;
        }

    }
    /// <summary>
    /// 用于属性属性赋值操作的帮助类
    /// </summary>
    /// <typeparam name="T">原对象类</typeparam>
    /// <typeparam name="S">目标对象类</typeparam>
    public class EntityPropHelper<T,S> where T:class where S:class
    {
        /// <summary>
        /// 将t中的各个对于的属性值赋值到s中相应的属性
        /// </summary>
        /// <param name="t">原对象</param>
        /// <param name="s">目标对象</param>
        /// <param name="columnMap">以T中的属性名为键，S中的属性名为值的字典</param>
        public static void CopyProp(T t, S s, Dictionary<string,string> columnMap) 
        {
            Type typeT = typeof(T);
            Type typeS = typeof(S);
                       
            var sProps = typeS.GetProperties(BindingFlags.Public | BindingFlags.Instance).ToList();
            var sPropDic = new Dictionary<string, PropertyInfo>();

            var keys = columnMap.Keys;
            var values = columnMap.Values;

            //遍历S的所有属性,将符合修改的存入字典中 
            sProps.ForEach(p => { if (values.Contains(p.Name)) { sPropDic.Add(p.Name, p); } });

            var tProps = typeT.GetProperties(BindingFlags.Public | BindingFlags.Instance).ToList();
            var tPropDic = new Dictionary<string, PropertyInfo>();

            //遍历S的所有属性,将符合修改的存入字典中 
            tProps.ForEach(p => { if (keys.Contains(p.Name)) { tPropDic.Add(p.Name, p); } });

            foreach(var key in keys)
            {
                var propValue = tPropDic[key].GetValue(t, null);
                sPropDic[columnMap[key]].SetValue(s, propValue, null);
            }

        }


        ///// <summary>
        ///// 将s中的各个对于的属性值赋值到t中相应的属性
        ///// </summary>
        ///// <param name="t">目标对象</param>
        ///// <param name="s">原对象</param>
        ///// <param name="columnMap">以T中的属性名为键，S中的属性名为值的字典</param>
        //public static void CopyProp(S s,T t , Dictionary<string, string> columnMap)
        //{


        //        Type typeT = typeof(T);
        //        Type typeS = typeof(S);

        //        var sProps = typeS.GetProperties(BindingFlags.Public | BindingFlags.Instance).ToList();
        //        var sPropDic = new Dictionary<string, PropertyInfo>();

        //        var keys = columnMap.Keys;
        //        var values = columnMap.Values;

        //        //遍历S的所有属性,将符合修改的存入字典中 
        //        sProps.ForEach(p => { if (values.Contains(p.Name)) { sPropDic.Add(p.Name, p); } });

        //        var tProps = typeT.GetProperties(BindingFlags.Public | BindingFlags.Instance).ToList();
        //        var tPropDic = new Dictionary<string, PropertyInfo>();

        //        //遍历S的所有属性,将符合修改的存入字典中 
        //        tProps.ForEach(p => { if (keys.Contains(p.Name)) { tPropDic.Add(p.Name, p); } });

        //        foreach (var key in keys)
        //        {
        //            var propValue = sPropDic[columnMap[key]].GetValue(s, null);

        //            tPropDic[key].SetValue(t, propValue, null);
        //        }


        //}

        /// <summary>
        /// 将t中的各个对于的属性值赋值到s中相应的属性
        /// </summary>
        /// <param name="t">原对象</param>
        /// <param name="s">目标对象</param>
        /// <param name="columnMap">以T中的属性名为键，S中的属性名为值的字典</param>
        public static void CopyProp(T t, S s,List<string> propNames)
        {
            Type typeT = typeof(T);
            Type typeS = typeof(S);

            var sProps = typeS.GetProperties(BindingFlags.Public | BindingFlags.Instance).ToList();
            var sPropDic = new Dictionary<string, PropertyInfo>();

           
            //遍历S的所有属性,将符合修改的存入字典中 
            sProps.ForEach(p => { if (propNames.Contains(p.Name)) { sPropDic.Add(p.Name, p); } });

            var tProps = typeT.GetProperties(BindingFlags.Public | BindingFlags.Instance).ToList();
            var tPropDic = new Dictionary<string, PropertyInfo>();

            //遍历S的所有属性,将符合修改的存入字典中 
            tProps.ForEach(p => { if (propNames.Contains(p.Name)) { tPropDic.Add(p.Name, p); } });

            foreach (var propName in propNames)
            {
                var propValue = tPropDic[propName].GetValue(t, null);
                sPropDic[propName].SetValue(s, propValue, null);
            }
        }
    }
}