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

		[Column("title")]
		[MaxLength(255)]
		public string Title { get; set; }

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

		[Column("type")]
		[MaxLength(50)]
		public string Type { get; set; }

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

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

		[Column("total_questions")]
		public int TotalQuestions { get; set; } = 0;

		[Column("parent_question_group")]
		public Guid? ParentQG { get; set; }

		[Required]
		[Column("created_by")]
		[ForeignKey("Creator")]
		public Guid CreatedBy { 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; }

		[Column("valid_group")]
		public bool ValidGroup { get; set; }



		public User Creator { get; set; }
		public QuestionGroup ParentQuestionGroup { get; set; }
		public ICollection<QuestionGroup> ChildQuestionGroups { get; set; }
		public ICollection<AssignmentQuestion> AssignmentQuestions { get; set; }
		public ICollection<Question> Questions { get; set; }

		public QuestionGroup()
		{
			Id = Guid.NewGuid();
			Questions = new HashSet<Question>();
			CreatedAt = DateTime.UtcNow;
			UpdatedAt = DateTime.UtcNow;
			IsDeleted = false;
			ValidGroup = true;
		}
	}
}