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

namespace EMIS.DataLogic.Common.Students
{ 
    public class BatchRepeatDAL : DifferentDynamicDAL
    {
        public IQueryable<DifferentDynamicView> GetBatchRepeatProcessView(Expression<Func<CF_DifferentDynamic, bool>> exp)
        {
            var query = (from change in DifferentDynamicRepository.GetList(exp)
                         join user in UserRepository.Entities on change.UserID equals user.UserID
                         join classmajor in ClassmajorRepository.Entities on change.BeforeClassmajorID equals classmajor.ClassmajorID
                         join grade in GrademajorRepository.Entities on classmajor.GrademajorID equals grade.GrademajorID
                         join afterGrade in GrademajorRepository.Entities
                         on new { grade.FacultymajorID, SchoolyearID = grade.GradeID + 1 }
                         equals new { afterGrade.FacultymajorID, SchoolyearID = afterGrade.GradeID } into dafterGrade
                         from afterGrade in dafterGrade.DefaultIfEmpty()
                         join afterClass in ClassmajorRepository.Entities
                            on new { GrademajorID = (Guid?)afterGrade.GrademajorID, classmajor.ClassNum }
                            equals new { afterClass.GrademajorID, afterClass.ClassNum } into dafterClass
                         from afterClass in dafterClass.DefaultIfEmpty()
                         join afterClass1 in ClassmajorRepository.Entities
                            on afterGrade.GrademajorID equals afterClass1.GrademajorID into dafterClass1
                         from afterClass1 in dafterClass1.DefaultIfEmpty()
                         group new { Change = change, AfterClass = afterClass, AfterClass1 = afterClass1 }
                         by new { Change = change, User = user } into g
                         select new DifferentDynamicView
                         {
                             EntityID = g.Key.Change.StudentChangeID,
                             SchoolyearID = g.Key.Change.SchoolyearID,
                             UserID = g.Key.Change.UserID,
                             Name = g.Key.User.Name,
                             DifferentDynamicType = g.Key.Change.ChangeTypeID,
                             Reason = g.Key.Change.ChangeReasonID,
                             InSchoolStatusID = g.Key.Change.BeforeInSchoolStatusID,
                             StudentStatus = g.Key.Change.BeforeStudentStatus,
                             //StandardID = g.Key.Change.StandardID,
                             ClassmajorID = g.Key.Change.BeforeClassmajorID,
                             //AfterStandardID = g.Key.Change.StandardID,
                             AfterClassmajorID = g.Select(x => (Guid?)x.AfterClass.ClassmajorID).FirstOrDefault() ?? g.Select(x => (Guid?)x.AfterClass1.ClassmajorID).FirstOrDefault(),
                             AfterInSchoolStatusID = g.Key.Change.AfterInSchoolStatusID,
                             AfterStudentStatus = g.Key.Change.AfterStudentStatus,
                             ReturnSchoolyearID = g.Key.Change.ReturnSchoolyearID,
                             ApplyTypeID = g.Key.Change.ChangeApplyTypeID,
                             ApplyRemark = g.Key.Change.Description,
                             BeginTime = g.Key.Change.ChangeDate,
                             EndTime = g.Key.Change.ChangeDate,
                             //Source = g.Key.Change.Source,
                             //Direction = g.Key.Change.Direction,
                             EntityApprovalStatus = g.Key.Change.ApprovalStatus,
                             Remark = g.Key.Change.Remark,
                             EntityCreateTime = g.Key.Change.CreateTime,
                             EntityApplyDate = g.Key.Change.ChangeDate,
                             EntityCreateUserID = g.Key.Change.CreateUserID,
                         }
                         );

            return query;
        }
    }
}