using FreeSql;
using FreeSql.ClickHouse.Curd;
using FreeSql.Internal.CommonProvider;
using System;
using System.Linq.Expressions;

public static partial class FreeSqlClickHouseGlobalExtensions
{

    /// <summary>
    /// 特殊处理类似 string.Format 的使用方法，防止注入，以及 IS NULL 转换
    /// </summary>
    /// <param name="that"></param>
    /// <param name="args"></param>
    /// <returns></returns>
    public static string FormatClickHouse(this string that, params object[] args) => _clickHouseAdo.Addslashes(that, args);
    static FreeSql.ClickHouse.ClickHouseAdo _clickHouseAdo = new FreeSql.ClickHouse.ClickHouseAdo();

    public static ISelect<T> LimitBy<T>(this ISelect<T> that, Expression<Func<T, object>> selector, int limit, int offset = 0)
    {
        if (limit <= 0 && offset <= 0) return that;
        var s0p = that as ClickHouseSelect<T>;
        var oldOrderBy = s0p._orderby;
        s0p._orderby = "";
        try
        {
            s0p.InternalOrderBy(selector);
            s0p._limitBy = $"limit {(offset > 0 ? $"{offset}, " : "")}{limit} by {s0p._orderby}";
        }
        finally
        {
            s0p._orderby = oldOrderBy;
        }
        return that;
    }
}