using System;
using System.Collections.Generic;
using System.Data;
using System.Text;
using System.Threading.Tasks;
using System.Linq;
namespace SqlSugar 
{
    public partial class FastestProvider<T>:IFastest<T> where T:class,new()
    {
        private SqlSugarProvider context;
        private ISugarQueryable<T> queryable;
        private string AsName { get; set; }
        private int Size { get; set; }
        private EntityInfo entityInfo { get; set; }
        public FastestProvider(SqlSugarProvider sqlSugarProvider)
        {
            this.context = sqlSugarProvider;
            this.queryable = this.context.Queryable<T>();
            entityInfo=this.context.EntityMaintenance.GetEntityInfo<T>();
        }

        #region BulkCopy
        public int BulkCopy(List<T> datas)
        {
            return BulkCopyAsync(datas).ConfigureAwait(true).GetAwaiter().GetResult();
        }
        public async Task<int> BulkCopyAsync(List<T> datas)
        {
            if (Size > 0)
            {
                int resul=0;
                 await this.context.Utilities.PageEachAsync(datas, Size, async item =>
                {
                    resul+= await _BulkCopy(item);
                });
                return resul;
            }
            else
            {
                return await _BulkCopy(datas);
            }
        }
        #endregion

        #region BulkUpdate
        public int BulkUpdate(List<T> datas)
        {
            return BulkUpdateAsync(datas).ConfigureAwait(true).GetAwaiter().GetResult();
        }
        public async Task<int> BulkUpdateAsync(List<T> datas)
        {
           var whereColumns=entityInfo.Columns.Where(it => it.IsPrimarykey).Select(it=>it.DbColumnName??it.PropertyName).ToArray();
           var updateColumns = entityInfo.Columns.Where(it => !it.IsPrimarykey&&!it.IsIdentity&&!it.IsOnlyIgnoreUpdate&&!it.IsIgnore).Select(it => it.DbColumnName ?? it.PropertyName).ToArray();
           return await BulkUpdateAsync(datas,whereColumns,updateColumns);
        }
        public int BulkUpdate(List<T> datas, string[] whereColumns, string[] updateColumns) 
        {
            return BulkUpdateAsync(datas,whereColumns,updateColumns).ConfigureAwait(true).GetAwaiter().GetResult();
        }
        public async Task<int> BulkUpdateAsync(List<T> datas,string [] whereColumns,string [] updateColumns)
        {

            if (Size > 0)
            {
                int resul = 0;
                await this.context.Utilities.PageEachAsync(datas, Size, async item =>
                {
                    resul += await _BulkUpdate(item, whereColumns, updateColumns);
                });
                return resul;
            }
            else
            {
                return  await _BulkUpdate(datas, whereColumns, updateColumns);
            }
        }
        #endregion

        #region Core
        private async Task<int> _BulkUpdate(List<T> datas, string[] whereColumns, string[] updateColumns)
        {
            var isAuto = this.context.CurrentConnectionConfig.IsAutoCloseConnection;
            this.context.CurrentConnectionConfig.IsAutoCloseConnection = false;
            DataTable dt = ToDdateTable(datas);
            IFastBuilder buider = GetBuider();
            buider.Context = context;
            await buider.CreateTempAsync<T>(dt);
            await buider.ExecuteBulkCopyAsync(dt);
            //var queryTemp = this.context.Queryable<T>().AS(dt.TableName).ToList();//test
            var result = await buider.UpdateByTempAsync(GetTableName(), dt.TableName, updateColumns, whereColumns);
            this.context.DbMaintenance.DropTable(dt.TableName);
            this.context.CurrentConnectionConfig.IsAutoCloseConnection = isAuto;
            return result;
        }
        private async Task<int> _BulkCopy(List<T> datas)
        {
            DataTable dt = ToDdateTable(datas);
            IFastBuilder buider = new SqlServerFastBuilder();
            buider.Context = context;
            var result = await buider.ExecuteBulkCopyAsync(dt);
            return result;
        }
        #endregion

    }
}