using NPOI.SS.Formula.Functions;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

using System.Linq;
using System.Threading.Tasks;

namespace _2021_backend.Models
{
    public class Session
    {

        public Session()
        {
            Id = 0;
        }
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        [Required()]
        [Display(Name = "场次int")]
        public int Id { get; set; }
        [Required()]
        [Display(Name = "活动日期")]
        [DataType(DataType.Date)]
        [DisplayFormat(DataFormatString = "{0:d}", ApplyFormatInEditMode = true)]
        public DateTime Day { get; set; }
        [Display(Name = "开始时间")]
        [DataType(DataType.Time)]
        [DisplayFormat(DataFormatString = "{0:t}", ApplyFormatInEditMode = true)]
        [Required()]
        public DateTime BeginTime { get; set; }
        [RegularExpression(@"^20[04]$", ErrorMessage = "200或204")]
        [Display(Name = "地点")]
        [Required()]
        public string Place { get; set; }
        [Display(Name = "主活动官")]
        public List<int> Chiefs { get; set; }

        [Display(Name = "可容纳人数")]
        public int Capacity { get; set; }

        [Display(Name = "短信通知")]
        public bool SendSMS { get; set; }
        [Display(Name = "活动的人")]
        public List<int> Students { get; set; }

    }
    public class SessionDto
    {

        public DateTime Day { get; set; }
        public DateTime BeginTime { get; set; }
    }


    public class SessionDtoComparer : IEqualityComparer<SessionDto>
    {
        #region IEqualityComparer<user> Members
        public bool Equals(SessionDto a, SessionDto b)
        {
            return a.Day == b.Day && a.BeginTime == b.BeginTime;
        }
        public int GetHashCode(SessionDto a)
        {
            return a.Day.GetHashCode() + a.BeginTime.GetHashCode();
        }
        #endregion
    }
}