using Ant.Data;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq.Expressions;

namespace Ant.ORM
{
    public interface IQuery<T>
    {
        IQuery<T> AsTracking();
        IEnumerable<T> AsEnumerable();
        /// <summary>
        /// 显示列
        /// </summary>
        /// <typeparam name="TResult"></typeparam>
        /// <param name="selector"></param>
        /// <returns></returns>
        IQuery<TResult> Select<TResult>(Expression<Func<T, TResult>> selector);
        /// <summary>
        /// 查询条件
        /// </summary>
        /// <param name="predicate"></param>
        /// <returns></returns>
        IQuery<T> Where(Expression<Func<T, bool>> predicate);
        /// <summary>
        /// 用IN作为查询条件的SQL语句
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <typeparam name="TValue"></typeparam>
        /// <param name="source"></param>
        /// <param name="propertySelector"></param>
        /// <param name="values"></param>
        /// <returns></returns>
        IQuery<T> WhereIn(Expression<Func<T, object>> propertySelector, params object[] values);
        /// <summary>
        /// 默认排序
        /// </summary>
        /// <typeparam name="K"></typeparam>
        /// <param name="predicate"></param>
        /// <returns></returns>
        IOrderedQuery<T> OrderBy<K>(Expression<Func<T, K>> predicate);
        /// <summary>
        /// 降序排序
        /// </summary>
        /// <typeparam name="K"></typeparam>
        /// <param name="predicate"></param>
        /// <returns></returns>
        IOrderedQuery<T> OrderByDesc<K>(Expression<Func<T, K>> predicate);
        /// <summary>
        /// 跳过序列中的指定位置之前的元素
        /// </summary>
        /// <param name="count"></param>
        /// <returns></returns>
        IQuery<T> Skip(int count);
        /// <summary>
        /// 提前序列中的指定位置之前的元素（TOP取条数据）
        /// </summary>
        /// <param name="count"></param>
        /// <returns></returns>
        IQuery<T> Top(int count);
        /// <summary>
        /// 对共享公共特性元素进行分组
        /// </summary>
        /// <typeparam name="K"></typeparam>
        /// <param name="predicate"></param>
        /// <returns></returns>
        IGroupingQuery<T> GroupBy<K>(Expression<Func<T, K>> predicate);
        /// <summary>
        /// 内连接
        /// </summary>
        /// <typeparam name="TSource"></typeparam>
        /// <param name="q"></param>
        /// <param name="on"></param>
        /// <returns></returns>
        IJoiningQuery<T, TSource> InnerJoin<TSource>(IQuery<TSource> q, Expression<Func<T, TSource, bool>> on);
        /// <summary>
        /// 左关联
        /// </summary>
        /// <typeparam name="TSource"></typeparam>
        /// <param name="q"></param>
        /// <param name="on"></param>
        /// <returns></returns>
        IJoiningQuery<T, TSource> LeftJoin<TSource>(IQuery<TSource> q, Expression<Func<T, TSource, bool>> on);
        /// <summary>
        /// 右关联
        /// </summary>
        /// <typeparam name="TSource"></typeparam>
        /// <param name="q"></param>
        /// <param name="on"></param>
        /// <returns></returns>
        IJoiningQuery<T, TSource> RightJoin<TSource>(IQuery<TSource> q, Expression<Func<T, TSource, bool>> on);
        /// <summary>
        /// 全连接
        /// </summary>
        /// <typeparam name="TSource"></typeparam>
        /// <param name="q"></param>
        /// <param name="on"></param>
        /// <returns></returns>
        IJoiningQuery<T, TSource> FullJoin<TSource>(IQuery<TSource> q, Expression<Func<T, TSource, bool>> on);
        //2017-12-2季健国加
        IJoiningQuery<T, TOther> InnerJoin<TOther>(Expression<Func<T, TOther, bool>> on);
        IJoiningQuery<T, TOther> LeftJoin<TOther>(Expression<Func<T, TOther, bool>> on);
        IJoiningQuery<T, TOther> RightJoin<TOther>(Expression<Func<T, TOther, bool>> on);
        IJoiningQuery<T, TOther> FullJoin<TOther>(Expression<Func<T, TOther, bool>> on);

        /// <summary>
        /// 返回序列中的第一个元素
        /// </summary>
        /// <returns></returns>
        ResponseModel First();
        /// <summary>
        /// 
        /// </summary>
        /// <param name="request"></param>
        /// <returns></returns>
        ResponseModel First(RequestModel request);
        /// <summary>
        /// 返回序列中的第一个元素
        /// </summary>
        /// <param name="predicate"></param>
        /// <returns></returns>
        ResponseModel First(Expression<Func<T, bool>> predicate);
        /// <summary>
        ///获取一条数据
        /// </summary>
        /// <returns></returns>
        ResponseModel FirstOrDefault();

        /// <summary>
        /// 
        /// </summary>
        /// <param name="request"></param>
        /// <returns></returns>
        ResponseModel FirstOrDefault(RequestModel request);


        /// <summary>
        /// 获取一条数据
        /// </summary>
        /// <param name="predicate"></param>
        /// <param name="request"></param>
        /// <returns></returns>
        ResponseModel FirstOrDefault(Expression<Func<T, bool>> predicate, RequestModel request);
        /// <summary>
        /// 获取列表数据
        /// </summary>
        /// <returns></returns>
        ResponseModel ToList();
        /// <summary>
        /// 
        /// </summary>
        /// <returns></returns>
        ResponseModel ToList(RequestModel request);
        /// <summary>
        /// 确定序列中是否有元素满足条件
        /// </summary>
        /// <returns></returns>
        ResponseModel Any();
        /// <summary>
        /// 确定序列中是否有元素满足条件
        /// </summary>
        /// <param name="predicate"></param>
        /// <returns></returns>
        ResponseModel Any(Expression<Func<T, bool>> predicate);

        /// <summary>
        /// 获取数据库记录
        /// </summary>
        /// <returns></returns>
        int Count();
        /// <summary>
        /// 获取数据库记录
        /// </summary>
        /// <param name="request"></param>
        /// <returns></returns>
        ResponseModel Count(RequestModel request);

        ResponseModel LongCount();
        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="TResult"></typeparam>
        /// <param name="selector"></param>
        /// <returns></returns>
        TResult Max<TResult>(Expression<Func<T, TResult>> selector);
        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="TResult"></typeparam>
        /// <param name="selector"></param>
        /// <returns></returns>
        TResult Min<TResult>(Expression<Func<T, TResult>> selector);

        Tuple<int, ResponseModel> Sum(Expression<Func<T, int>> selector, RequestModel request = null);
        Tuple<int?, ResponseModel> Sum(Expression<Func<T, int?>> selector, RequestModel request = null);
        Tuple<long, ResponseModel> Sum(Expression<Func<T, long>> selector, RequestModel request = null);
        Tuple<long?, ResponseModel> Sum(Expression<Func<T, long?>> selector, RequestModel request = null);
        Tuple<decimal, ResponseModel> Sum(Expression<Func<T, decimal>> selector, RequestModel request = null);
        Tuple<decimal?, ResponseModel> Sum(Expression<Func<T, decimal?>> selector, RequestModel request = null);
        Tuple<double, ResponseModel> Sum(Expression<Func<T, double>> selector, RequestModel request = null);
        Tuple<double?, ResponseModel> Sum(Expression<Func<T, double?>> selector, RequestModel request = null);
        Tuple<float, ResponseModel> Sum(Expression<Func<T, float>> selector, RequestModel request = null);
        Tuple<float?, ResponseModel> Sum(Expression<Func<T, float?>> selector, RequestModel request = null);

        Tuple<int, ResponseModel> Average(Expression<Func<T, int>> selector, RequestModel request = null);
        Tuple<int?, ResponseModel> Average(Expression<Func<T, int?>> selector, RequestModel request = null);
        Tuple<long, ResponseModel> Average(Expression<Func<T, long>> selector, RequestModel request = null);
        Tuple<long?, ResponseModel> Average(Expression<Func<T, long?>> selector, RequestModel request = null);
        Tuple<decimal, ResponseModel> Average(Expression<Func<T, decimal>> selector, RequestModel request = null);
        Tuple<decimal?, ResponseModel> Average(Expression<Func<T, decimal?>> selector, RequestModel request = null);
        Tuple<double, ResponseModel> Average(Expression<Func<T, double>> selector, RequestModel request = null);
        Tuple<double?, ResponseModel> Average(Expression<Func<T, double?>> selector, RequestModel request = null);
        Tuple<float, ResponseModel> Average(Expression<Func<T, float>> selector, RequestModel request = null);
        Tuple<float?, ResponseModel> Average(Expression<Func<T, float?>> selector, RequestModel request = null);
    }
}