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("questions")]
	public class Question
	{
		[Key]
		[Column("id")]
		public Guid Id { get; set; }

		[Required]
		[Column("title")]
		[MaxLength(65535)]
		public string Title { get; set; }

		[Column("answer")]
		[MaxLength(65535)]
		public string? Answer { get; set; }



		[Required]
		[Column("type")]
		[MaxLength(20)]
		public QuestionType Type { get; set; } = QuestionType.Unknown;

		[Column("difficulty_level")]
		[MaxLength(10)] 
		public DifficultyLevel DifficultyLevel { get; set; } = DifficultyLevel.easy;

		[Column("subject_area")]
		public SubjectAreaEnum SubjectArea { get; set; } = SubjectAreaEnum.Unknown;


		[Column("options")]
		public string? Options { get; set; }

		[Column("key_point")]
		public Guid? KeyPointId { get; set; }

		[Column("lesson")]
		public Guid? LessonId { get; set; }


		[Required]
		[Column("created_by")]
		public Guid CreatorId { get; set; }

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

		[Column("updated_at")]
		public DateTime UpdatedAt { get; set; }

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


		// Navigation Properties
		[ForeignKey(nameof(CreatorId))]
		public User Creator { get; set; }

		[ForeignKey(nameof(KeyPointId))]
		public KeyPoint? KeyPoint { get; set; }
		[ForeignKey(nameof(LessonId))]	
		public Lesson? Lesson { get; set; }
		
		public ICollection<AssignmentQuestion>? AssignmentQuestions { get; set; }

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


}