/**************************************************************************************************
 *  Program Name:     Programming Project 5.7: Bookshelf
 *  Class Name:       BookshelfFilestore
 *  Author:           Terry Weiss
 *  Date Written:     October 15, 2015
 *  Program Description:
 *     This class loads and saves all instance data for a book that will be used in `Bookshelf`.
 **************************************************************************************************/
package pp5_7;

//import Book
//import Bookshelf
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;


/**
 *
 * @author Terry
 */
public final class BookshelfFilestore {
    private static final String DEFAULT_SHELF_FILENAME = "shelf.bl";
    private static File shelfFile;
    private static PrintWriter writer;
    private static List<Book> shelf;


    BookshelfFilestore() throws IOException, FileNotFoundException {
        shelfFile = new File(DEFAULT_SHELF_FILENAME);
        writer = new PrintWriter(new FileWriter(DEFAULT_SHELF_FILENAME));
        shelf = new ArrayList<>();
    }

    BookshelfFilestore( String filename ) throws IOException, FileNotFoundException {
        shelfFile = new File(filename);
        writer = new PrintWriter(new FileWriter(filename));
        shelf = new ArrayList<>();

        if (shelfFile.exists()) {
            loadBookshelf();
        }
    }

    BookshelfFilestore( List<Book> booklist ) throws IOException, FileNotFoundException {
        shelfFile = new File(DEFAULT_SHELF_FILENAME);
        writer = new PrintWriter(new FileWriter(DEFAULT_SHELF_FILENAME));
        shelf = booklist;
    }

    BookshelfFilestore( List<Book> booklist, String filename )
        throws IOException, FileNotFoundException
    {
        shelfFile = new File(filename);
        writer = new PrintWriter(new FileWriter(filename));
        shelf = booklist;

        if (shelfFile.exists()) {
            saveBookshelf();
        }
    }

    BookshelfFilestore( Bookshelf bookshelf ) throws IOException, FileNotFoundException {
        shelfFile = new File(bookshelf.getName() + ".bl");
        writer = new PrintWriter(new FileWriter(bookshelf.getName() + ".bl"));
        shelf = bookshelf.getBookList();
    }

    BookshelfFilestore( Bookshelf bookshelf, String filename )
        throws IOException, FileNotFoundException
    {
        shelfFile = new File(filename);
        writer = new PrintWriter(new FileWriter(filename));
        shelf = bookshelf.getBookList();

        if (shelfFile.exists()) {
            saveBookshelf();
        }
    }




    /**
     * Updates the working file using the specified filename.
     *
     * @param filename Relative path of new file to be used
     * @return <tt>true</tt> if new file currently exists
     * @throws IOException
     */
    public boolean useFile( String filename ) throws IOException {
        shelfFile = new File(filename);

        return shelfFile.exists();
    }




    /**
     * Writes all {@link pp5_7.Book}s to the current file.
     *
     * @return <tt>true</tt> if any books were saved
     */
    public boolean saveBookshelf() {
        if (shelf.isEmpty()) {
            return false;
        }
        else {
            for (Book book : shelf) {
                writer.write(book.getTitle() + "\n");
                writer.write(book.getPages() + "\n");
                writer.write(book.getAuthor() + "\n");
                writer.write(book.getGenre() + "\n");
                writer.write("\n");
                writer.flush();
            }

            return true;
        }
    }


    /**
     * Replaces current booklist with all the {@link pp5_7.Book}s from the current working file.
     *
     * @return List of Books loaded
     * @throws FileNotFoundException
     */
    public List<Book> loadBookshelf() throws FileNotFoundException {
        Scanner fileReader = new Scanner(shelfFile);
        fileReader.useDelimiter("\n\n");

        shelf.clear();
        while (fileReader.hasNext()) {
            String bookStr = fileReader.next();
            Scanner bookReader = new Scanner(bookStr);
            String title, author, genre;
            int pages;

            // For each book in the file's list
            for (int i = 0; bookReader.hasNext(); i++) {
                title  = bookReader.nextLine();
                pages  = Integer.parseInt(bookReader.nextLine());
                author = bookReader.nextLine();
                genre  = bookReader.nextLine();

                shelf.add(new Book(title, pages, author, genre));
            }
        }

        return shelf;
    }


    public static void main( String[] args ) throws IOException
    {
        List<Book> list = new ArrayList<>();

        list.add(new Book("Pizza Cookbook", 751, "Pizza Chef", "Non-fiction"));
        list.add(new Book("Space Cowboys", 152, "Somebody Cool", "Sci-Fi"));
        list.add(new Book("Space Cadets", 852, "Somebody Cool", "History"));
        list.add(new Book("Cable News", 659, "Johny", "Non-fiction"));
        list.add(new Book("Pizza Cookbook", 751, "Pizza Chef", "Non-fiction"));


        BookshelfFilestore bfs = new BookshelfFilestore(list);
        bfs.saveBookshelf();


        List<Book> list2 = bfs.loadBookshelf();

        for (Book book : list2) {
            System.out.println(book.displayDetails() + "\n");
        }
    }
}