namespace BookShopSystem.Models
{
    using System;
    using System.Collections.Generic;
    using System.ComponentModel.DataAnnotations;

    public class Book
    {
        private ICollection<Category> categories;

        private ICollection<Book> relatedBooks;
        public Book()
        {
            this.categories = new HashSet<Category>();
            this.relatedBooks = new HashSet<Book>();
        }

        public int Id { get; set; }

        [MaxLength(50)]
        [MinLength(1)]
        [Required]
        public string Title { get; set; }

        [MaxLength(1000)]
        public string Description { get;set; }

        [Required]
        public int Copies { get; set; }

        [Required]
        public EditionType Edition{ get; set; }

        [Required]
        public decimal Price { get; set; }

        [Required]
        public DateTime? ReleaseDate { get; set; }

        [Required]
        public AgeRestriction AgeRestriction { get; set; }

        [Required]
        public int AuthorId { get; set; }

        public virtual Author Author { get; set; }

        public virtual ICollection<Book> RelatedBooks
        {
            get
            {
                return this.relatedBooks;
            }

            set
            {
                this.relatedBooks = value;
            }
        }

        public virtual ICollection<Category> Categories
        {
            get
            {
                return this.categories;
            }

            set
            {
                this.categories = value;
            }
        }
    }
}

namespace BookShopSystem.Models
{
    using System.Collections;
    using System.Collections.Generic;
    using System.ComponentModel.DataAnnotations;
    using System.ComponentModel.DataAnnotations.Schema;

    public class Author
    {
        private ICollection<Book> books;

        public Author()
        {
            this.books = new HashSet<Book>();
        }

        public int Id { get; set; }

        [NotMapped]
        public string FullName => this.FirstName + " " + this.LastName;

        [Required]
        public string FirstName { get; set; }

        [Required]
        public string LastName { get; set; }


        public virtual ICollection<Book> Books
        {
            get
            {
                return this.books;
            }
            set
            {
                this.books = value;
            }
        }
    }
}

namespace BookShopSystem.Models
{
    public enum EditionType
    {
        Normal = 0,
        Promo = 1,
        Gold = 2
    }
}