using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
using System.Xml;
using System.Xml.Serialization;


/// <summary>
/// Summary description for Book
/// </summary>

[XmlRoot("BookStore")]
public class BookStore
{
    LinkedList<Book> booksList;

    public BookStore(){
        booksList = new LinkedList<Book>();
    }

    public void SaveToXML(string path)
    {
        XmlSerializer s = new XmlSerializer(typeof(BookStore));
        TextWriter w = new StreamWriter(path);
        s.Serialize(w, booksList);
        w.Close();
    }

    public void LoadFromXML(string path)
    {
        XmlSerializer s = new XmlSerializer(typeof(BookStore));
        TextReader r = new StreamReader(path);
        booksList = ((BookStore)s.Deserialize(r)).BooksList;
        r.Close();
    }

    public override string ToString()
    {
        string s = "";
        LinkedListNode<Book> l = booksList.First;
        while (l != null)
        {
            s += l.Value.Name + "; ";
            l = l.Next;
        }
        return s;
    }

    public void AddBook(Book book)
    {
        booksList.AddFirst(book);
    }

    public void RemoveBook(Book book)
    {
        booksList.Remove(book);
    }

    [XmlElement("Book")]
    public LinkedList<Book> BooksList
    {
        get { return booksList; }
        set { booksList = value; }
    }
}

public class Book
{
    [XmlAttribute("name")]
    private string name;
    [XmlAttribute("imageurl")]
    private string imageurl;
    [XmlAttribute("subject")]
    private string subject;
    [XmlAttribute("author")]
    private string author;
    [XmlAttribute("level")]
    private int level;
    [XmlAttribute("year")]
    private int year;
    [XmlAttribute("price")]
    private double price;

    public Book()
    {
    }

    public Book(string name, string imageurl, string subject, string author, int level, int year, double price)
    {
        this.name = name;
        this.imageurl = imageurl;
        this.subject = subject;
        this.author = author;
        this.level = level;
        this.year = year;
        this.price = price;
    }

    public string Name
    {
        get { return name; }
        set { name = value; }
    }

    public string Imageurl
    {
        get { return imageurl; }
        set { imageurl = value; }
    }

    public string Subject
    {
        get { return subject; }
        set { subject = value; }
    }

    public string Author
    {
        get { return author; }
        set { author = value; }
    }

    public int Level
    {
        get { return level; }
        set { if (value > 0) level = value; }
    }

    public int Year
    {
        get { return year; }
        set { if ((value > 1900) && (value <= DateTime.Now.Year)) year = value; }
    }

    public double Price
    {
        get { return price; }
        set { if (value >= 0) price = value; }
    }
}