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

namespace Model
{
    /// <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
    ///     question : the question which it answer to
    /// </summary>
    public class Answer
    {
        private uint id;
        private string? content;
        private uint idQuestion;
        public Question? question;

        //      getters and setters for attributes
        public uint Id
        {
            get => id;
            private set { id = value; }
        }
        public string Content
        {
            get => content == null ? "" : content;
            set { content = value == "" ? null : value; }
        }
        public uint IdQuestion
        {
            get => idQuestion; // null = no idQuestion
            private set { idQuestion = value; }
        }

        public Question? Question
        {
            get => question;
            private set { question = value; IdQuestion = value == null ? 0 : value.Id; }
        }
        /// <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="question">the question which it answer to</param>
        public Answer(string content, Question? question = null, uint id = 0)
        {
            Content = content;
            Id = id;
            Question = question;
        }

    }
}