using Ant.Core;
using Ant.Core.Visitors;
using Ant.Data;
using Ant.DbExpressions;
using Ant.Descriptors;
using Ant.Entity;
using Ant.Exceptions;
using Ant.Infrastructure;
using Ant.ORM;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Text;
using System.Transactions;

namespace Ant.SqlServer
{
    /// <summary>
    /// 
    /// </summary>
    public class MsSqlContext : DbContext
    {
        DbContextServiceProvider _dbContextServiceProvider;


        public MsSqlContext()
        {
            this.PagingMode = PagingMode.ROW_NUMBER;
            this._dbContextServiceProvider = new DbContextServiceProvider(PagingMode);

        }

        /// <summary>
        /// 数据库配置
        /// </summary>
        public string ConnectionString { get; set; }

        /// <summary>
        /// 数据库类型
        /// </summary>
        public override DatabaseType DatabaseType
        {
            get { return DatabaseType.MSSQLServer; }
        }
        /// <summary>
        /// 数据库配置
        /// </summary>
        public override DataAccess db
        {
            get { return new MSSqlDataAccess(ConnectionString); }
        }
        /// <summary>
        /// 开启事务
        /// </summary>
        public void BeginTransaction()
        {
            db.BeginTransaction();
        }
        /// <summary>
        /// 提交事务
        /// </summary>
        public void Commit()
        {
            db.Commit();
        }

        /// <summary>
        /// 回滚事务
        /// </summary>
        public void RollBack()
        {
            db.RollBack();
        }


        /// <summary>
        /// 调用说明
        /// public bool DataAcessPackageTrans(out string error)
        //{
        //    var db = DBExtend;
        //    //简化了事务写法,自动提交回滚
        //    return DataAcessPackageTrans(db,(out string ex) =>
        //    {
        //        ex = "";
        //        var product = new ProductData();
        //        product.BarCode = "code" + DateTime.Now.Millisecond;
        //        product.Number = 10;
        //        db.InsertFromObj(product);
        //        return false; //会回滚
        //    }, out error);
        //} 
        /// 使用DbTransaction封装事务(不推荐)
        /// </summary>
        /// <param name="db"></param>
        /// <param name="method"></param>
        /// <param name="error"></param>
        /// <returns></returns>
        public bool DataAcessPackageTrans(DataAccess sqldb, TransMethod method, out string error)
        {
            error = "";
            sqldb.BeginTransaction();
            try
            {
                var a = method(out error);
                if (!a)
                {
                    sqldb.RollBack();
                    return false;
                }
                sqldb.Commit();
            }
            catch (Exception ero)
            {
                error = "提交事务时发生错误:" + ero.Message;
                sqldb.RollBack();
                return false;
            }
            return true;
        }


        /// <summary>
        /// 调用说明
        /// public bool TransactionTest(out string error)
        //{
        //    //简化了事务写法,自动提交回滚
        //    return PackageTrans((out string ex) =>
        //    {
        //        ex = "";
        //        var product = new ProductData();
        //        product.BarCode = "code" + DateTime.Now.Millisecond;
        //        product.Number = 10;
        //        ProductDataManage.Instance.Add(product);
        //        return false; //会回滚
        //    }, out error);
        //}
        /// 使用TransactionScope封装事务[基本方法]分布式事务
        /// </summary>
        /// <param name="method"></param>
        /// <param name="error"></param>
        /// <returns></returns>
        public bool PackageTrans(TransMethod method, out string error)
        {
            error = "";
            using (var trans = new TransactionScope())
            {
                try
                {
                    var a = method(out error);
                    if (!a)
                    {
                        return false;
                    }
                    trans.Complete();
                }
                catch (Exception ero)
                {
                    error = "提交事务时发生错误:" + ero.Message;
                    return false;
                }
            }
            return true;
        }

        /// <summary>
        /// 数据库分页类型（SQL2005或者2008下，使用ROW_NUMBER()分页）（SQL2012下，使用OFFSET/FETCH NEXT分页）
        /// </summary>
        public PagingMode PagingMode { get; set; }
        /// <summary>
        /// 创建用哪种数据库解析SQL语句
        /// </summary>
        public override IDbContextServiceProvider DbContextServiceProvider
        {
            get { return this._dbContextServiceProvider; }
        }
    }
}