using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using EMIS.DataLogic.Repositories;
using EMIS.ViewModel.SystemView;
using System.Linq.Expressions;
using EMIS.Entities;

namespace EMIS.DataLogic.SystemDAL
{
    public class AnnouncementDAL
    {
        public AnnouncementTypeRepository AnnouncementTypeRepository { get; set; }
        public AnnouncementRepository AnnouncementRepository { get; set; }
        public UserRepository UserRepository { get; set; }

        public IQueryable<AnnouncementTypeView> GetAnnouncementTypeView(Expression<Func<Sys_AnnouncementType, bool>> typeExpression)
        {
            var q = (from at in AnnouncementTypeRepository.GetList(typeExpression) 
                     orderby at.No
                     select new AnnouncementTypeView
                     {
                         AnnouncementTypeID = at.AnnouncementTypeID,
                         No = at.No,
                         Name = at.Name,
                         Description = at.Description,
                         RecordStatus = at.RecordStatus,
                         CreateUserID = at.CreateUserID,
                         CreateTime = at.CreateTime,
                         ModifyUserID = at.ModifyUserID,
                         ModifyTime = at.ModifyTime
                     });

            return q;
        }

        public IQueryable<AnnouncementView> GetAnnouncementView(Expression<Func<Sys_Announcement, bool>> expression)
        {
            var q = (from a in AnnouncementRepository.GetList(expression) 
                     join cu in UserRepository.GetList(x => x.CF_Staff != null) on a.CreateUserID equals cu.UserID into dcu 
                     from ecu in dcu.DefaultIfEmpty()
                     join mu in UserRepository.GetList(x => x.CF_Staff != null) on a.ModifyUserID equals mu.UserID into dmu 
                     from emu in dmu.DefaultIfEmpty() 
                     orderby a.CreateTime descending
                     select new AnnouncementView
                     {
                         AnnouncementID = a.AnnouncementID,
                         AnnouncementTypeID = a.AnnouncementTypeID,
                         AnnouncementTypeDesc = a.Sys_AnnouncementType.Name,
                         Title = a.Title,
                         Content = a.Content,
                         StartTime = a.StartTime,
                         EndTime = a.EndTime,
                         RecordStatus = a.RecordStatus,
                         CreateUserID = a.CreateUserID,
                         CreateUserName = ecu.Name,
                         CreateTime = a.CreateTime,
                         CreateDepartmentID = ecu.CF_Staff.DepartmentID,
                         CreateDepartmentName = ecu.CF_Staff.CF_Department.Name,
                         ModifyUserID = a.ModifyUserID,
                         ModifyUserName = emu.Name,
                         ModifyTime = a.ModifyTime
                     });

            return q;
        }
    }
}