using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using AutoMapper;

namespace MyCode.Project.Infrastructure.Common
{
    public class AutoMapperHelper
    {

        /// <summary>
        /// 映射单个实体
        /// </summary>
        /// <typeparam name="T">目标对象</typeparam>
        /// <typeparam name="F">数据来源对象</typeparam>
        /// <param name="fromData">数据原变量</param>
        /// <returns></returns>
        public static T AutoMappToSingle<T,F>(F fromData)
        {
            var datatype = fromData.GetType();
            Mapper.Initialize(x => {
                x.CreateMap<F,T> ();
            });
           var  result = Mapper.Map<T>(fromData);
            return result;
        }


        /// <summary>
        /// 映射LIST
        /// </summary>
        /// <typeparam name="T">目标对象List</typeparam>
        /// <typeparam name="F">数据来源对象List</typeparam>
        /// <param name="fromData">数据原变量List</param>
        /// <returns></returns>
        public static List<T> AutoMappToList<T, F>(List<F> fromData)
        {
            var datatype = fromData.GetType();
            Mapper.Initialize(x => {
                x.CreateMap<F, T>();
            });
            var result = Mapper.Map<List<T>>(fromData);
            return result;
        }

        /// <summary>
        /// 将返回的实体中的指定类型的NULL值转为 指定的值 
        /// </summary>
        /// <typeparam name="T">要修改的实体的类型</typeparam>
        /// <typeparam name="H">要指定的值的类型</typeparam>
        /// <param name="ToEntity">要修改的实体</param>
        /// <param name="NewValue">要指定的值</param>        
        public static void ClearNullOfEntity<T, H>(T ToEntity, H NewValue) where T : new()
        {

            if (ToEntity != null)
            {
                PropertyInfo[] proFEntity = ToEntity.GetType().GetProperties();
                foreach (PropertyInfo pi in proFEntity)
                {
                    string NewValueTypeName = NewValue.GetType().Name;
                    string PiTypeName = pi.PropertyType.Name;
                    var item = pi.PropertyType.GenericTypeArguments.FirstOrDefault();
                    if (NewValue.GetType().Name.Equals(pi.PropertyType.Name) || (item != null && item.Name == NewValueTypeName))
                    {
                        var value = pi.GetValue(ToEntity);
                        if (value == null)
                        {
                            try
                            {
                                pi.SetValue(ToEntity, NewValue, null);
                            }
                            catch
                            {

                            }
                        }
                    }



                }
            }

        }
    }
}