#if netcore
#else

using FreeSql.DataAnnotations;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using System.Linq;
using System.Linq.Expressions;
using System.Threading;

namespace FreeSql
{
    /// <summary>
    /// 包括 CreateTime/UpdateTime/IsDeleted 的实体基类
    /// </summary>
    [Table(DisableSyncStructure = true)]
    public abstract class BaseEntity
    {
        static IFreeSql _ormPriv;
        /// <summary>
        /// 全局 IFreeSql orm 对象
        /// </summary>
        public static IFreeSql Orm => _ormPriv ?? throw new Exception(@"使用前请初始化 BaseEntity.Initialization(new FreeSqlBuilder()
.UseAutoSyncStructure(true)
.UseConnectionString(DataType.Sqlite, ""data source=test.db;max pool size=5"")
.Build());");

        /// <summary>
        /// 初始化BaseEntity
        /// BaseEntity.Initialization(new FreeSqlBuilder()
        /// <para></para>
        /// .UseAutoSyncStructure(true)
        /// <para></para>
        /// .UseConnectionString(DataType.Sqlite, "data source=test.db;max pool size=5")
        /// <para></para>
        /// .Build());
        /// </summary>
        /// <param name="fsql">IFreeSql orm 对象</param>
        public static void Initialization(IFreeSql fsql)
        {
            _ormPriv = fsql;
            _ormPriv.Aop.CurdBefore += (s, e) => Trace.WriteLine(e.Sql + "\r\n");
        }
    }

    public abstract class BaseEntityReadOnly<TEntity> : BaseEntity where TEntity : class
    {
        /// <summary>
        /// 查询数据
        /// </summary>
        /// <returns></returns>
        public static ISelect<TEntity> Select
        {
            get
            {
                var select = Orm.Select<TEntity>().TrackToList(TrackToList); //自动为每个元素 Attach;
                return select;
            }
        }

        static void TrackToList(object list)
        {
            if (list == null) return;
            var ls = list as IList<TEntity>;
            if (ls == null)
            {
                var ie = list as IEnumerable;
                if (ie == null) return;
                var isFirst = true;
                foreach (var item in ie)
                {
                    if (item == null) return;
                    if (isFirst)
                    {
                        isFirst = false;
                        var itemType = item.GetType();
                        if (itemType == typeof(object)) return;
                        if (itemType.FullName.Contains("FreeSqlLazyEntity__")) itemType = itemType.BaseType;
                        if (Orm.CodeFirst.GetTableByEntity(itemType)?.Primarys.Any() != true) return;
                        if (item is BaseEntity<TEntity> == false) return;
                    }
                    (item as BaseEntity<TEntity>)?.Attach();
                }
                return;
            }
            if (ls.Any() == false) return;
            if (ls.FirstOrDefault() is BaseEntity<TEntity> == false) return;
            if (Orm.CodeFirst.GetTableByEntity(typeof(TEntity))?.Primarys.Any() != true) return;
            foreach (var item in ls)
                (item as BaseEntity<TEntity>)?.Attach();
        }

        /// <summary>
        /// 查询条件，Where(a => a.Id > 10)，支持导航对象查询，Where(a => a.Author.Email == "2881099@qq.com")
        /// </summary>
        /// <param name="exp">lambda表达式</param>
        /// <returns></returns>
        public static ISelect<TEntity> Where(Expression<Func<TEntity, bool>> exp) => Select.Where(exp);
        /// <summary>
        /// 查询条件，Where(true, a => a.Id > 10)，支导航对象查询，Where(true, a => a.Author.Email == "2881099@qq.com")
        /// </summary>
        /// <param name="condition">true 时生效</param>
        /// <param name="exp">lambda表达式</param>
        /// <returns></returns>
        public static ISelect<TEntity> WhereIf(bool condition, Expression<Func<TEntity, bool>> exp) => Select.WhereIf(condition, exp);

        /// <summary>
        /// 仓储对象
        /// </summary>
        protected IBaseRepository<TEntity> Repository { get; set; }

        /// <summary>
        /// 附加实体，在更新数据时，只更新变化的部分
        /// </summary>
        public TEntity Attach()
        {
            if (this.Repository == null)
                this.Repository = Orm.GetRepository<TEntity>();

            var item = this as TEntity;
            this.Repository.Attach(item);
            return item;
        }
    }
}

#endif