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

namespace XYY.Core.Standard.ExcelHelper.MSExcelHelper
{
    public class MSExcelTableMapping : MSExcelClassMapping<System.Data.DataTable>
    {

    }

    public class MSExcelDefaultMapping<T> : MSExcelClassMapping<T>
    {

    }

    public abstract class MSExcelClassMapping<TClass>
    {
        public virtual int[] SheetIndexs(List<string> sheetNames)
        {
            return new int[] { 1 };
        }

        public virtual int RemarkIndex()
        {
            return 0;
        }

        public List<ExcelMappingItem> Items { get; set; } = new List<ExcelMappingItem>();
        public List<ExcelMappingAttrItem> Attrs { get; set; } = new List<ExcelMappingAttrItem>();




        //public List<ExcelMappingItem<TClass> items => new List<ExcelMappingItem>();
        public ExcelMappingItem Map<TMember>(Expression<Func<TClass, TMember>> expression)
        {
            var MappingItem = new ExcelMappingItem();
            if (expression.Body.NodeType == ExpressionType.MemberAccess)
            {
                MemberExpression memberExpression = expression.Body as MemberExpression;
                MappingItem = Map(memberExpression.Member);
                MappingItem.LambdaExpression = expression;
            }
            return MappingItem;
        } 

        public ExcelMappingItem Map(MemberInfo memberInfo)
        {
            var MappingItem = new ExcelMappingItem();
            if (memberInfo.MemberType == MemberTypes.Property)
            {
                PropertyInfo propertyInfo = memberInfo as PropertyInfo;
                MappingItem.PropertyInfo = propertyInfo;
                var pt = MappingItem.PropertyInfo.PropertyType;
                MappingItem.ColumnFormattext = ExcelFormattextHelper.GetColumnFormattext(pt);
                Items.Add(MappingItem);
                return MappingItem;
            }
            else
            {
                return MappingItem;
            }
        }
    }

}