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

namespace Model
{
    public class Chapter
    {
        /// <summary>
        /// define a mathematical chapter or thematic
        /// attributes :
        ///     id : identifier in the database
        ///     name : name of the chapter
        /// </summary>
        int id;
        string? name;
        /// <summary>
        /// getters and setters for attributs
        /// </summary>
        public int? Id
        {
            get => id == -1 ? null : id ;
            private set { id = value == null || value < -1 ? -1 : value.Value; }
        }
        public string Name
        {
            get => name == null ? "" : name;
            set {  name = value == "" ? null : value; }
        }

        /// <summary>
        /// custructor of a mathematical chapter
        /// </summary>
        /// <param name="name">name of the chapter</param>
        /// <param name="id">id in the database</param>
        public Chapter(string name, int? id = null)
        {
            Name = name;
            Id = id;
        }
    }
}