/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package kitap;

/**
 *
 * @author PsiCat
 */
public class Book
{

    private final String _isbn;
    private final String _name;
    private final String _subject;

    public Book(String isbn, String name, String subject)
    {
        _name = name;
        _isbn = isbn;
        _subject = subject;
    }

    public String getName()
    {
        return _name;
    }

    public String getISBN()
    {
        return _isbn;
    }

    public String getSubject()
    {
        return _subject;
    }

    @Override
    public String toString()
    {
        return "Book ISBN:" + _isbn + " Name:" + _name + " Subject:" + _subject;
    }
}

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package kitap;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;

/**
 *
 * @author PsiCat
 */
public class Main
{

    private enum Read
    {

        ISBN,
        NAME,
        SUBJECT;
    }

    private enum Command
    {

        ADD("-add"),
        GET_LIST("-getList"),
        REMOVE("-remove"),
        QUIT("-quit");
        private String _value;

        Command(String value)
        {
            _value = value;
        }

        public String getValue()
        {
            return _value;
        }
    }
    private static Main _instance;
    private HashMap<String, Book> _books = new HashMap<String, Book>();

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws IOException
    {
        _instance = new Main();
    }

    public Main() throws IOException
    {
        String commandLine = "";

        System.out.println(Command.ADD.getValue() + ": to register a book.");
        System.out.println(Command.GET_LIST.getValue() + ": to get a list of registered books.");
        System.out.println(Command.REMOVE.getValue() + " <id>: to remove a registered book.");
        System.out.println(Command.QUIT.getValue() + ": to quit.");

        InputStreamReader converter = new InputStreamReader(System.in);
        BufferedReader in = new BufferedReader(converter);
        while (true)
        {
            commandLine = in.readLine();

            if (commandLine.equals(Command.ADD.getValue()))
                readBook();
            else if (commandLine.equals(Command.GET_LIST.getValue()))
                printList();
            else if (commandLine.equals(Command.REMOVE.getValue()))
                removeBook();
            else if (commandLine.equals(Command.QUIT.getValue()))
                kill();
            else
                System.out.println("Invalid command.");
        }
    }

    private void readBook() throws IOException
    {
        Book book;
        String commandLine = "";

        InputStreamReader converter = new InputStreamReader(System.in);
        BufferedReader in = new BufferedReader(converter);

        Read read = Read.ISBN;
        String isbn = null;
        String name = null;
        String subject = null;
        System.out.print("ISBN: ");
        while (true)
        {
            commandLine = in.readLine();

            if (commandLine != null && read == Read.ISBN)
            {
                isbn = commandLine;
                System.out.print("Name: ");
                read = Read.NAME;
            } else if (commandLine != null && read == Read.NAME)
            {
                name = commandLine;
                System.out.print("Subject: ");
                read = Read.SUBJECT;
            } else if (commandLine != null && read == Read.SUBJECT)
            {
                subject = commandLine;
                break;
            }
        }

        book = new Book(isbn, name, subject);
        registerBook(book);
    }

    private void registerBook(Book book)
    {
        if (!_books.containsKey(book.getISBN()))
        {
            _books.put(book.getISBN(), book);
            System.out.println("Book has successfully registered.");
        } else
        {
            System.out.println("Book is already registered.");
        }
        System.out.println("\n");
    }

    private void printList()
    {
        if (!_books.isEmpty())
        {
            System.out.println("List of registered books:");
            System.out.println(getList());
        } else
        {
            System.out.println("No books registered yet.");
        }
    }

    private void removeBook() throws IOException
    {
        String commandLine = "";

        InputStreamReader converter = new InputStreamReader(System.in);
        BufferedReader in = new BufferedReader(converter);

        String isbn = null;
        System.out.print("ISBN: ");
        while (true)
        {
            commandLine = in.readLine();

            if (commandLine != null)
            {
                isbn = commandLine;
                break;
            }
        }

        removeBook(isbn);
    }

    private void removeBook(String isbn)
    {
        if (_books.containsKey(isbn))
        {
            _books.remove(isbn);
            System.out.println("Book removed.");
        } else
        {
            System.out.println("No such book exist.");
        }
    }

    private Book getBook(String isbn)
    {
        Book book = null;

        if (_books.containsKey(isbn))
            book = _books.get(isbn);

        return book;
    }

    private String getList()
    {
        String list = new String();

        for (Book book : _books.values())
        {
            list += "ISBN:" + book.getISBN() + " ";
            list += "Name:" + book.getName() + " ";
            list += "Subject:" + book.getSubject() + "\n";
        }


        return list;
    }

    private void kill()
    {
        System.out.println("Terminating");
        System.exit(0);
    }
}