using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace Model
{
    public class Answer
    {
        /// <summary>
        /// define an answer for a Question with Mutiple Choice
        /// attributes :
        ///     id : identifier in the database
        ///     content : content of the answer
        ///     idQuestion : the id of the question which it answer to
        /// </summary>
        private int id;
        private string? content;
        private int idQuestion;

        /// <summary>
        /// getters and setters for attributes
        /// </summary>
        public int? Id
        {
            get => id == -1 ? null : id; // null = no id
            private set { id = value < -1 || value == null ? -1 : value.Value; }
        }
        public string Content
        {
            get => content == null ? "" : content;
            set { content = value == "" ? null : value; }
        }
        public int? IdQuestion
        {
            get => idQuestion == -1 ? null : idQuestion; // null = no idQuestion
            private set { idQuestion = value < -1 || value == null ? -1 : value.Value; }
        }
        /// <summary>
        /// constructor of an answer
        /// </summary>
        /// <param name="content">the content of the answer</param>
        /// <param name="id">the id in the database</param>
        /// <param name="idQuestion">the id of the question which it answer to</param>
        public Answer(string content, int? idQuestion = null, int? id = null)
        {
            Content = content;
            Id = id;
            IdQuestion = idQuestion;
        }

    }
}