using Ant.Core;
using Ant.Infrastructure;
using Ant.ORM;
using Ant.Query.QueryExpressions;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;

namespace Ant.Query
{
    class OrderedQuery<T> : Queryable<T>, IOrderedQuery<T>
    {
        public OrderedQuery(AntORM dbContext, QueryExpression exp, bool trackEntity)
            : base(dbContext, exp, trackEntity)
        {

        }
        /// <summary>
        /// 按升序执行次要排序
        /// </summary>
        /// <typeparam name="K"></typeparam>
        /// <param name="predicate"></param>
        /// <returns></returns>
        public IOrderedQuery<T> ThenBy<K>(Expression<Func<T, K>> predicate)
        {
            OrderExpression e = new OrderExpression(QueryExpressionType.ThenBy, typeof(T), this.QueryExpression, predicate);
            return new OrderedQuery<T>(this.DbContext, e, this._trackEntity);
        }
        /// <summary>
        /// 按降序执行次要排序
        /// </summary>
        /// <typeparam name="K"></typeparam>
        /// <param name="predicate"></param>
        /// <returns></returns>
        public IOrderedQuery<T> ThenByDesc<K>(Expression<Func<T, K>> predicate)
        {
            OrderExpression e = new OrderExpression(QueryExpressionType.ThenByDesc, typeof(T), this.QueryExpression, predicate);
            return new OrderedQuery<T>(this.DbContext, e, this._trackEntity);
        }
    }
}