using Microsoft.EntityFrameworkCore;
using YD_WeChatApplet.Api.SmartSportsEntitys;
using YD_WeChatApplet.Api.Utilities;
using YD_WeChatApplet.Commons.Dto;
using YD_WeChatApplet.Commons.Dto.HomeWork;
using YD_WeChatApplet.Commons.Dto.School;
using YD_WeChatApplet.Context;
using YD_WeChatApplet.Services;

namespace YD_WeChatApplet.Api.Services.Impl
{
    public class StudentService : IStudentService
    {
        public SmartSportsContext _sportsContext;

        public StudentService(SmartSportsContext sportsContext)
        {
            _sportsContext = sportsContext;
        }

        /// <summary>
        /// 获取班级列表
        /// </summary>
        /// <returns></returns>
        public async Task<List<ClassListDto>> ClassListbyTeacher()
        {
            string teacherPhoneNo = UserLoginContext.Current.PhoneNo;

            var classList = await (
                from t in _sportsContext.Teacher
                join a in _sportsContext.ClassAssocTeacher on t.Id equals a.TeacherId
                join c in _sportsContext.Class on a.ClassId equals c.Id
                where t.TeacherPhoneNo == teacherPhoneNo
                select new ClassListDto()
                {
                    GradeId = c.GradeId,
                    ClassId = c.Id,
                    Name = $"{c.GradeName ?? ""}-{c.ClassName ?? ""}"
                }).ToListAsync();

            return classList;
        }

        /// <summary>
        /// 获取学生列表
        /// </summary>
        /// <param name="dto"></param>
        /// <returns></returns>
        public async Task<PageDataDto<StudentListDto>> StudentListByClassId(StudentListByClassIdDto dto)
        {
            var query = _sportsContext.Student.Where(x => x.ClassId == dto.ClassId);

            var totalCount = await query.CountAsync();

            var students = await query
                .Select(x => new StudentListDto()
                {
                    StudentNo = x.StudentNo,
                    StudentName = x.StudentName,
                    Sex = x.Sex,
                    Photo = x.Photo
                })
                .Skip((dto.PageIndex - 1) * dto.PageSize)
                .Take(dto.PageSize)
                .ToListAsync();

            return new PageDataDto<StudentListDto>
            {
                Total = totalCount,
                Datas = students
            };
        }
    }
}