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

namespace Entities.Contracts
{
	[Table("lesson")]
	public class Lesson
	{
		[Key]
		public Guid Id { get; set; }

		[StringLength(255)]
		public string Title { get; set; } = string.Empty;

		public string Description { get; set; } = string.Empty;

		[Required]
		public Guid TextbookID { get; set; }


		[ForeignKey(nameof(TextbookID))]
		public Textbook Textbook { get; set; }

		[InverseProperty(nameof(KeyPoint.Lesson))]
		public ICollection<KeyPoint>? KeyPoints { get; set; }

		[InverseProperty(nameof(Question.Lesson))]
		public ICollection<Question>? Questions { get; set; }

		[InverseProperty(nameof(LessonQuestion.Lesson))]
		public ICollection<LessonQuestion>? LessonQuestions { get; set; } 



		public Lesson()
		{
			Id = Guid.NewGuid();
			KeyPoints = new HashSet<KeyPoint>();
			Questions = new HashSet<Question>();	
			LessonQuestions = new HashSet<LessonQuestion>();	
		}
	}
}