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

namespace EMIS.ExtensionLogic.DataLogic.ExaminationManage
{
    public class ExaminationPLanDAL : EMIS.DataLogic.ExaminationManage.ExaminationPlanDAL
    {
        public override IQueryable<ExaminationPlanView> GetExaminationPlanByEducationMission(
            Expression<Func<EM_EducationMission, bool>> educationMissionExpression, 
            Expression<Func<EM_EducationMissionClass, bool>> emcExp)
        {
            var missionClassQuery = (
                         from emc in EducationMissionClassRepository.GetList(emcExp) 
                         join cm in CoursematerialRepository.Entities on emc.CoursematerialID equals cm.CoursematerialID
                         join ems in ExaminationModeSettingRepository.GetList(x => x.IsGeneratePlan == false)
                            on emc.ExaminationModeID equals ems.ExaminationModeID into dems
                         from eems in dems.DefaultIfEmpty() 
                         from esc in emc.EM_EducationSchedulingClass 
                         from s in esc.CF_Student 
                         where emc.RecordStatus != (int)EM_EducationMissionClassStatus.NotSubmitted
                            && eems.ExaminationModeSettingID == null && emc.HandleModeID == (int)CF_HandleMode.RequiredCourse
                         group emc by new
                         {
                             emc.EducationMissionID,
                             emc.CoursematerialID,
                             cm.CourseName,
                             emc.ExaminationModeID,
                             s.ClassmajorID,
                             s.CF_Classmajor.Name
                         } into g
                         select g.Key
                         );
            var q = (from em in EducationMissionRepository.GetList(educationMissionExpression)
                     join c in missionClassQuery
                         on em.EducationMissionID equals c.EducationMissionID
                     from eep in ExaminationPlanRepository.Entities.Where(x => x.EducationMissionID == em.EducationMissionID 
                        && x.ClassmajorID == c.ClassmajorID).DefaultIfEmpty()
                     where eep.ExaminationPlanID == null
                     select new ExaminationPlanView
                     {
                         SchoolyearID = em.SchoolyearID,
                         CollegeID = em.CollegeID,
                         CoursematerialID = c.CoursematerialID,
                         ExaminationModeID = c.ExaminationModeID,
                         ExaminationStyleID = (int)EX_ExaminationStyle.CloseBook,
                         EducationMissionID = em.EducationMissionID,
                         ClassmajorID = c.ClassmajorID,
                         ClassName = c.Name,
                         ExaminationDate = null,
                         StartTime = null,
                         EndTime = null,
                         Students = (from esc in educationSchedulingClassRepository.Entities 
                                     from emc in EducationMissionClassRepository.Entities.Where(x => x.EducationMissionClassID == esc.EducationMissionClassID)
                                     from s in esc.CF_Student 
                                     where emc.EducationMissionID == em.EducationMissionID && s.ClassmajorID == c.ClassmajorID 
                                     group s by s.UserID into g
                                     select g.FirstOrDefault())
                     });

            return q;
        }
    }
}