using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace SqlSugar
{
    public class SqlServerBuilder : SqlBuilderProvider
    {
        public override string SqlTranslationLeft { get { return "["; } }
        public override string SqlTranslationRight { get { return "]"; } }
        public override bool SupportReadToken { get; set; } = true;

        public override string RemoveParentheses(string sql)
        {
            if (sql.Contains("ORDER BY")&&!sql.StartsWith("(SELECT TOP 1")&&!sql.Contains("(SELECT TOP 1000000")) 
            {
                sql = $"SELECT * FROM {sql.Replace("(SELECT ", "(SELECT TOP 1000000")} TEMP";
            }
            else if (sql.Contains("ORDER BY") && sql.StartsWith("(SELECT TOP 1"))
            {
                sql = $"SELECT * FROM ({ sql}) TEMP";
            }
            return sql;
        }
        public override void ChangeJsonType(SugarParameter paramter)
        {
            if (paramter.DbType ==  System.Data.DbType.AnsiString) 
            {
                paramter.DbType = System.Data.DbType.String;
            }
        }
        public override Task<bool> GetReaderByToken(System.Data.IDataReader dataReader, System.Threading.CancellationToken cancellationToken)
        {
            return((SqlDataReader)dataReader).ReadAsync(this.Context.Ado.CancellationToken.Value);
        }
    }
}