using Furion.FriendlyException;
using Mapster;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks;

namespace Myshipping.Application.Helper
{
    public static class MapsterExtHelper
    {
        /// <summary>
        /// 动态获取属性对应关系
        /// </summary>
        /// <typeparam name="TDto"></typeparam>
        /// <typeparam name="TEntity"></typeparam>
        /// <param name="property">字段代码</param>
        /// <returns>返回对应的字段代码</returns>
        public static string GetAdaptProperty<TDto, TEntity>(string property)
            where TDto : class
            where TEntity : class
        {
            try
            {
                var adapt = default(TDto).BuildAdapter().CreateMapExpression<TEntity>().Body as BlockExpression;

                var tryInfo = adapt.Expressions.FirstOrDefault(a => a.NodeType.ToString() == "Try");

                if (tryInfo == null)
                    throw Oops.Oh($"{nameof(GetAdaptProperty)} 读取TRY异常");

                var block = ((TryExpression)tryInfo).Body as BlockExpression;

                if (block == null)
                    throw Oops.Oh($"{nameof(GetAdaptProperty)} 读取BlockExpression异常");

                var blockNode = block.Expressions.FirstOrDefault(t => t.NodeType.ToString() == "Block");

                var member = (blockNode as BlockExpression).Expressions.Where(t => {
                    var right = ((t as BinaryExpression).Right as MemberExpression);

                    if (right == null)
                        return false;

                    var currInfo = right.Member;

                    return currInfo.Name.Equals(property, StringComparison.OrdinalIgnoreCase);
                }).FirstOrDefault();

                if (member != null)
                    return ((member as BinaryExpression).Left as MemberExpression).Member.Name;

            }
            catch (Exception ex)
            {
                throw Oops.Oh($"{nameof(GetAdaptProperty)} 读取BlockExpression异常");
            }

            return string.Empty;
        }


    }
}