using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks;

namespace PLCCommunication.Common
{
    public class ModelTools
    {
        public static class PubClone<TEntity, TResult>
        {
            private static readonly Func<TEntity, TResult> cache = GetFunc();

            private static Func<TEntity, TResult> GetFunc()
            {
                ParameterExpression parameterExpression = Expression.Parameter(typeof(TEntity), "p");
                List<MemberBinding> memberBindingList = new List<MemberBinding>();

                foreach (var item in typeof(TResult).GetProperties())
                {
                    if (!item.CanWrite)
                    {
                        continue;
                    }

                    var _Property = typeof(TEntity).GetProperty(item.Name);
                    if (_Property == null) 
                    {
                        continue;
                    }
                    if (item.PropertyType.FullName != _Property.PropertyType.FullName) 
                    {
                        continue;
                    }

                    MemberExpression property = Expression.Property(parameterExpression, typeof(TEntity).GetProperty(item.Name));
                    MemberBinding memberBinding = Expression.Bind(item, property);
                    memberBindingList.Add(memberBinding);
                }

                MemberInitExpression memberInitExpression = Expression.MemberInit(Expression.New(typeof(TResult)), memberBindingList.ToArray());
                Expression<Func<TEntity, TResult>> lambda = Expression.Lambda<Func<TEntity, TResult>>(memberInitExpression, new ParameterExpression[] { parameterExpression });

                return lambda.Compile();
            }

            public static TResult Trans(TEntity tIn)
            {
                if (tIn == null) 
                {
                    return default(TResult);
                }
                return cache(tIn);
            }

            public static List<TResult> TransList(List<TEntity> list)
            {
                List<TResult> result = new List<TResult>();
                foreach (var item in list)
                {
                    result.Add(Trans(item));
                }
                return result;
            }
        }
    }
}