using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations.Schema;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Entities.Contracts
{
	[Table("assignment_questions")]
	public class AssignmentQuestion
	{
		[Key]
		[Column("id")]
		public Guid Id { get; set; }

		[Column("question_id")]
		public Guid? QuestionId { get; set; } // 设为可空

		// 当 IsGroup 为 true 时，此为 QuestionGroup 的外键
		[Column("question_group_id")] // 新增一个外键列
		public Guid? QuestionGroupId { get; set; } // 设为可空

		[Required]
		[Column("group_id")]
		[ForeignKey("AssignmentGroup")]
		public Guid AssignmentGroupId { get; set; }


		[Required]
		[Column("question_number")]
		public byte QuestionNumber { get; set; }


		[Column("created_at")]
		public DateTime CreatedAt { get; set; }

		[Column("score")]
		public float? Score { get; set; }

		[Required]
		[Column("bgroup")]
		public bool IsGroup { get; set; }

		[Column("deleted")]
		public bool IsDeleted { get; set; }


		public Question Question { get; set; }
		public QuestionGroup QuestionGroup { get; set; }	
		public ICollection<SubmissionDetail> SubmissionDetails { get; set; }
		public AssignmentGroup AssignmentGroup { get; set; }

		public AssignmentQuestion()
		{
			Id = Guid.NewGuid();
			SubmissionDetails = new HashSet<SubmissionDetail>();
		}
	}
}