using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using EMISOnline.Entities;
using EMISOnline.DataLogic.Repositories;
using EMISOnline.ViewModel.Educational;
using System.Linq.Expressions;
using Bowin.Common.Linq;

namespace EMISOnline.DataLogic.Educational
{
    public class CourseBuildDAL
    {
        public CourseChapterRepository CourseChapterRepository { get; set; }
        public UserRepository UserRepository { get; set; }
        public CourseVideoRepository CourseVideoRepository { get; set; }
        public CourseChapter_VideoRepository CourseChapter_VideoRepository { get; set; }

        public IQueryable<CourseChapterView> GetCourseChapterList()
        {
            var query = from c in CourseChapterRepository.Entities
                        join u in UserRepository.Entities on c.CreateUserID equals u.UserID into chaCrus
                        from cu in chaCrus.DefaultIfEmpty()
                        select new CourseChapterView
                        {
                            CourseChapterID = c.CourseChapterID,
                            CoursematerialID = c.CoursematerialID,
                            Name = c.Name,
                            OrderID = c.OrderID,
                            ParentCourseChapterID = c.ParentCourseChapterID,
                            VideoTypeID = c.VideoTypeID,
                            OuterVideoUrl = c.OuterVideoUrl,
                            CreateTime = c.CreateTime,
                            CreateUserID = c.CreateUserID,
                            CreateUserName = cu.Name
                        };

            return query;
        }

        public IQueryable<CourseVideoView> GetChaperVideoList()
        {
            var query = from v in CourseVideoRepository.Entities
                        join ccv in CourseChapter_VideoRepository.Entities on v.CourseVideoID equals ccv.CourseVideoID
                        select new CourseVideoView
                        {
                            CourseVideoID = v.CourseVideoID,
                            Name = v.Name,
                            PlayUrl = v.PlayUrl,
                            CreateUserID = v.CreateUserID,
                            CreateTime = v.CreateTime,
                            CourseChapterID = ccv.CourseChapterID
                        };

            return query;
        }

        public IQueryable<CourseVideoView> GetVideoList()
        {
            var query = from v in CourseVideoRepository.Entities
                        select new CourseVideoView
                        {
                            CourseVideoID = v.CourseVideoID,
                            Name = v.Name,
                            PlayUrl = v.PlayUrl,
                            CreateUserID = v.CreateUserID,
                            CreateTime = v.CreateTime
                        };

            return query;
        }

        public EM_CourseChapter GetChapterSingle(Guid CourseChapterID)
        {
            return CourseChapterRepository.Entities.Where(c => c.CourseChapterID == CourseChapterID).FirstOrDefault();
        }

        public void DelChapterVideo(Guid CourseChapterID)
        {
            Expression<Func<EM_CourseChapter_Video, bool>> exp = (e => true);
            exp = exp.And(e => e.CourseChapterID == CourseChapterID);
            CourseChapter_VideoRepository.UnitOfWork.Remove(exp);
        }

        public void DelChapter(Guid CourseChapterID)
        {
            DelChapterVideo(CourseChapterID);

            Expression<Func<EM_CourseChapter, bool>> exp = (e => true);
            exp = exp.And(e => e.CourseChapterID == CourseChapterID);
            CourseChapterRepository.UnitOfWork.Remove(exp);
        }

        public bool IsAnySubChapter(Guid ParentCourseChapterID)
        {
            return CourseChapterRepository.Entities.Where(c => c.ParentCourseChapterID == ParentCourseChapterID).Any();
        }
    }
}