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

namespace EMISOnline.CommonLogic.EducationalServices
{
    public class CourseWareServices : BaseServices, ICourseWareServices
    {
        public CourseWareDAL CourseWareDAL { get; set; }

        public IGridResultSet<CourseWareView> GetCourseWareList(int pageIndex, int pageSize,  string CourseVideoName,DateTime? beginTime, DateTime? endTime)
        {
            Expression<Func<CourseWareView, bool>> exp = (e => true);
            //if (!string.IsNullOrEmpty(grademajorName))
            //{
            //    exp = exp.And(e => e.GrademajorName.Contains(grademajorName.Trim()));
            //}
            //if (!string.IsNullOrEmpty(courseName))
            //{
            //    exp = exp.And(e => e.CoursematerialName.Contains(courseName.Trim()));
            //}
            //if (!string.IsNullOrEmpty(createUser))
            //{
            //    exp = exp.And(e => e.CreateUserName.Contains(createUser.Trim()));
            //}
            if (!string.IsNullOrEmpty(CourseVideoName))
            {
                exp = exp.And(e => e.CourseVideoName.Contains(CourseVideoName.Trim()));
            }
            if (beginTime.HasValue)
            {
                exp = exp.And(e => e.CreateTime >= beginTime);
            }
            if (endTime.HasValue)
            {
                DateTime d = endTime.Value.AddDays(1);
                exp = exp.And(e => e.CreateTime <= d);
            }

            var list = CourseWareDAL.GetCourseWareList().Where(exp).OrderByDescending(e => e.GrademajorName).ThenBy(e => e.CoursematerialName).ThenBy(e => e.CourseVideoName)
                .ThenByDescending(e => e.CreateTime).ToGridResultSet(pageIndex, pageSize);

            return list;
        }
    }
}