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

namespace iWareCommon.Utils
{
    /// <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);
            }
        }
    }
}