using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using EMIS.Entities;
using EMIS.ViewModel;
using EMIS.ViewModel.ScoreManage;

namespace EMIS.ExtensionLogic.DataLogic.GraduationManage
{
    public class GraduationPreliminaryDAL : EMIS.DataLogic.GraduationManage.GraduationManage.GraduationPreliminaryDAL
    {
        /// <summary>
        /// 查询对应的毕业预审学生最终成绩信息StudentScoreView（根据相应的学生信息、毕业学期并且匹配执行计划）
        /// 注：学生最终成绩以执行计划为准（左连），未修习成绩默认为0分
        /// 注：匹配规则（以学生信息、课程信息为准，广中医个性化配置）
        /// </summary>
        /// <param name="expStudent"></param>
        /// <param name="expSchoolyear"></param>
        /// <returns></returns>
        public override IQueryable<StudentScoreView> GetGraPreStuFinScoreExecutablePlanViewQueryable(Expression<Func<CF_Student, bool>> expStudent,
                Expression<Func<EMIS.Entities.CF_Schoolyear, bool>> expSchoolyear)
        {
            var graPreStudentList = from gpstu in this.GetGraPreStudentQueryable(expStudent, expSchoolyear)
                                    select gpstu;

            var graPreStuFinScoreList = from finsco in FinallyScoreRepository.GetList(x => x.RecordStatus > (int)SYS_STATUS.UNUSABLE)
                                        join stu in graPreStudentList
                                        on finsco.UserID equals stu.UserID
                                        select new
                                        {
                                            FinallyScoreID = finsco.FinallyScoreID,
                                            SchoolyearID = finsco.SchoolyearID,
                                            UserID = finsco.UserID,
                                            CoursematerialID = finsco.CoursematerialID,
                                            CourseTypeID = finsco.CourseTypeID,
                                            SchoolyearNumID = finsco.SchoolyearNumID,
                                            StarttermID = finsco.StarttermID,
                                            ResultTypeID = finsco.ResultTypeID,
                                            CreateUserID = finsco.CreateUserID,
                                            Credit = finsco.Credit,
                                            TotalHours = finsco.TotalHours,
                                            ExamsCategoryID = finsco.ExamsCategoryID,
                                            ExamsStateID = finsco.ExamsStateID,
                                            TotalScore = finsco.TotalScore,
                                            ScoreCredit = finsco.ScoreCredit,
                                            GradePoint = finsco.GradePoint,
                                            CreateTime = finsco.CreateTime
                                        };

            var query = from stuep in this.GetGraPreStudentExecutablePlanViewQueryable(expStudent, expSchoolyear)
                        join finsco in graPreStuFinScoreList
                        on
                        new { UserID = stuep.UserID, CoursematerialID = stuep.CoursematerialID }
                        equals
                        new { UserID = finsco.UserID.Value, CoursematerialID = finsco.CoursematerialID }
                        into tempepfinsco
                        from epfinsco in tempepfinsco.DefaultIfEmpty()
                        select new StudentScoreView
                        {
                            SchoolyearID = stuep.SchoolyearID,
                            SchoolyearCode = stuep.SchoolyearCode,
                            UserID = stuep.UserID,
                            CoursematerialID = stuep.CoursematerialID,
                            CourseCode = stuep.CourseCode,
                            CourseName = stuep.CourseName,
                            CourseTypeID = stuep.CourseTypeID,
                            SchoolyearNumID = stuep.SchoolyearNumID,
                            StarttermID = stuep.StarttermID,
                            ResultTypeID = stuep.ResultTypeID,
                            Credit = stuep.Credit,
                            //TotalHours = stuep.Totalhours,(执行计划总学时类型不对，暂时不处理)
                            ExamsCategoryID = epfinsco.ExamsCategoryID,
                            ExamsStateID = epfinsco.ExamsStateID,
                            TotalScore = epfinsco.TotalScore ?? 0,
                            ScoreCredit = epfinsco.ScoreCredit ?? 0
                        };

            return query;
        }

    }
}