/**************************************************************************************************
 *  Program Name:     Programming Project 5.7: Bookshelf
 *  Class Name:       pp5_7.Librarian
 *  Author:           Terry Weiss
 *  Date Written:     October 15, 2015
 *  Program Description:
 *     This class handles everything with the `Bookshelf`. It allows the User to store a book,
 *  browse the list of books by various categories, view the details of a particular book and
 *  take a book off the shelf.
 **************************************************************************************************/
package pp5_7;

//import pp5_7.Book;
//import pp5_7.Bookshelf;
//import Prompt;

/**
 *  This class is the driver behind {@link pp5_7.Bookshelf}. It uses menus to allow the User to
 *  store a book, browse the list of books by various categories, view the details of a particular
 *  book and take a book off the shelf.
 *
 * @author Terry Weiss
 * @see pp5_7.Book
 * @see pp5_7.Bookshelf
 */
public class Librarian {
    /*
     * Definitions of all menu options for {@link #mainMenu}
     */
    private static enum Main_Options {
        MAIN_OPTION_ADD_BOOK, MAIN_OPTION_REMOVE_BOOK, MAIN_OPTION_BROWSE, MAIN_OPTION_QUIT;

        /**
         * Converts an int menu option to a Main_Options option. Since menus start at 1, all
         * options are returned as 1 less to start at 0.
         *
         * @param option Integer option to be converted
         * @return Converted value of Main_Options
         */
        public static Main_Options fromInteger( int option ) {
            return Main_Options.values()[option - 1];
        }
    }

    /*
     * Definitions of all menu options for {@link #browseMenu}
     */
    private static enum Browse_Options {
        BROWSE_OPTION_BROWSE_ALL, BROWSE_OPTION_BROWSE_AUTHORS, BROWSE_OPTION_BROWSE_GENRES,
        BROWSE_OPTION_BROWSE_SIZE, BROWSE_OPTION_CATEGORIZE_AUTHORS,
        BROWSE_OPTION_CATEGORIZE_GENRES, BROWSE_OPTION_VIEW_BY_AUTHOR, BROWSE_OPTION_VIEW_BY_GENRE,
        BROWSE_OPTION_VIEW_BOOK_DETAILS, BROWSE_OPTION_MAIN_MENU;

        /**
         * Converts an int menu option to a Browse_Options option.  Since menus start at 1, all
         * options are returned as 1 less to start at 0.
         *
         * @param option Integer option to be converted
         * @return Converted value of Browse_Options
         */
        public static Browse_Options fromInteger( int option ) {
            return Browse_Options.values()[option - 1];
        }

    }


    /*
     *  {@link pp5_7.Bookshelf} instance that holds each {@link pp5_7.Book}
     */
    private static final Bookshelf shelf = new Bookshelf();




    /*
     * Creates the main menu prompt message and prompts the user for which option to proceed.
     *
     * @return Menu option selected
     * @see pp5_7.Prompt
     */
    private static int mainMenu() {
        String prompt = "\n"
                + "\t1. Add a book\n"
                + "\t2. Remove a book\n"
                + "\t3. Browse\n"
                + "\t4. Quit\n"
                + "Please select an option";

        return Prompt.intInRange(prompt, 1, Main_Options.MAIN_OPTION_QUIT.ordinal() + 1,
                                    "Not a valid option.");
    }

    /*
     * Prompts the user for a {@link pp5_7.Book}'s details, creates the new Book and adds it
     * to the {@link pp5_7.Bookshelf}.
     *
     * @see pp5_7.Bookshelf#addBook
     */
    private static void addBook() {
        String title = Prompt.string("Enter title");
        String author = Prompt.string("Enter author");
        int pages = Prompt.wholeNumber("Enter number of pages");
        String genre = Prompt.string("Enter genre");

        Book book = new Book(title, pages, author, genre);
        shelf.addBook(book);
        System.out.println("Added " + book + " to the shelf.");
    }

    /*
     * Removes a book from the bookshelf, or displays a message that the book doesn't exist.
     */
    private static void removeBook() {
        String title = Prompt.string("Enter title");

        if (shelf.removeBook(title)) {
            System.out.println("Removed " + title + " from the shelf.");
        }
        else {
            System.out.println("That book doesn't exist.");
        }
    }


    /*
     * Creates the browse menu prompt message and prompts the user for which option to proceed.
     *
     * @return Menu option selected
     * @see pp5_7.Prompt
     */
    private static int browseMenu() {
        String prompt = "\n"
                + "\t1.  Browse all books\n"
                + "\t2.  Browse by authors\n"
                + "\t3.  Browse by genres\n"
                + "\t4.  Browse by size\n"
                + "\t5.  Categorize by author\n"
                + "\t6.  Categorize by genre\n"
                + "\t7.  View books by a certain author\n"
                + "\t8.  View books in a certain genre\n"
                + "\t9.  View book details\n"
                + "\t10. Return to main menu\n"
                + "Please select an option";

        return Prompt.intInRange(prompt, 1, Browse_Options.BROWSE_OPTION_MAIN_MENU.ordinal() + 1,
                                    "Not a valid option.");
    }

    /*
     * Displays all {@link pp5_7.Book}s on the {@link pp5_7.Bookshelf}, sorted by their title.
     *
     * @see pp5_7.Bookshelf#browse
     */
    private static void browseAll() {
        System.out.println("\nAll books in " + shelf + ":");
        System.out.print(shelf.browse());
    }

    /*
     * Displays all {@link pp5_7.Book}s on the {@link pp5_7.Bookshelf}, sorted by their author.
     *
     * @see pp5_7.Bookshelf#browseBooksByAuthor
     */
    private static void browseAuthors() {
        System.out.println("\nAll books in " + shelf + ":");
        System.out.print(shelf.browseByAuthor());
    }

    /*
     * Displays all {@link pp5_7.Book}s on the {@link pp5_7.Bookshelf}, sorted by their genre.
     *
     * @see pp5_7.Bookshelf#browseBooksByGenre
     */
    private static void browseGenres() {
        System.out.println("\nAll books in " + shelf + ":");
        System.out.print(shelf.browseByGenre());
    }

    /*
     * Displays all {@link pp5_7.Book}s on the {@link pp5_7.Bookshelf}, sorted by their size.
     *
     * @see pp5_7.Bookshelf#browseBySize
     */
    private static void browseSize() {
        System.out.println("\nAll books in " + shelf + ":");
        System.out.print(shelf.browseBySize());
    }

    /*
     * Displays all {@link pp5_7.Book}s on the {@link pp5_7.Bookshelf}, categorized and sorted
     * by their author.
     *
     * @see pp5_7.Bookshelf#browseByCategory
     */
    private static void browseCategorizeAuthors() {
        System.out.println("\nAll books in " + shelf + ":");
        System.out.print(shelf.browseByCategory("author"));
    }

    /*
     * Displays all {@link pp5_7.Book}s on the {@link pp5_7.Bookshelf}, categorized and sorted
     * by their genre.
     *
     * @see pp5_7.Bookshelf#browseByCategory
     */
    private static void browseCategorizeGenres() {
        System.out.println("\nAll books in " + shelf + ":");
        System.out.print(shelf.browseByCategory("genre"));
    }

    /*
     * Prompts for an author and displays all {@link pp5_7.Book}s on the {@link pp5_7.Bookshelf}
     * written by that author, sorted by their title.
     *
     * @see pp5_7.Bookshelf#browseBooksOfAuthor
     */
    private static void browseBooksByAuthor() {
        String author = Prompt.string("Pick an author");

        System.out.println("\nAll books by " + author + ":");
        System.out.print(shelf.browseBooksOfAuthor(author));
    }

    /*
     * Prompts for a genre and displays all {@link pp5_7.Book}s on the {@link pp5_7.Bookshelf}
     * that are in that genre, sorted by their title.
     *
     * @see pp5_7.Bookshelf#browseBooksOfGenre
     */
    private static void browseBooksByGenre() {
        String genre = Prompt.string("Pick a genre");

        System.out.println("\nAll " + genre + " books:");
        System.out.print(shelf.browseBooksOfGenre(genre));
    }

    /*
     * Prompts for a title and displays the details of that {@link pp5_7.Book}
     *
     * @see pp5_7.Bookshelf#viewBook
     */
    private static void browseViewDetails() {
        String title = Prompt.string("Enter a title");
        System.out.println(shelf.viewBook(title));
    }



    /**
     * Runs the menus to allows the User to store a book, browse the list of books by various
     * categories, view the details of a particular book, and take a book off the shelf.
     *
     * @param args Command line input isn't currently supported
     * @throws pp5_7.Prompt.OptionOutOfBoundsException In case a menu choice isn't valid
     * @see pp5_7.Book
     * @see pp5_7.Bookshelf
     */
    public static void main( String args[] ) throws Prompt.OptionOutOfBoundsException {
        int mainChoice, browseChoice;
        do {
            mainChoice = mainMenu();

            switch (Main_Options.fromInteger(mainChoice)) {
                case MAIN_OPTION_ADD_BOOK:
                    addBook();
                    break;
                case MAIN_OPTION_REMOVE_BOOK:
                    removeBook();
                    break;
                case MAIN_OPTION_BROWSE:
                    do {
                        browseChoice = browseMenu();

                        switch (Browse_Options.fromInteger(browseChoice)) {
                            case BROWSE_OPTION_BROWSE_ALL:
                                browseAll();
                                break;
                            case BROWSE_OPTION_BROWSE_AUTHORS:
                                browseAuthors();
                                break;
                            case BROWSE_OPTION_BROWSE_GENRES:
                                browseGenres();
                                break;
                            case BROWSE_OPTION_BROWSE_SIZE:
                                browseSize();
                                break;
                            case BROWSE_OPTION_CATEGORIZE_AUTHORS:
                                browseCategorizeAuthors();
                                break;
                            case BROWSE_OPTION_CATEGORIZE_GENRES:
                                browseCategorizeGenres();
                                break;
                            case BROWSE_OPTION_VIEW_BY_AUTHOR:
                                browseBooksByAuthor();
                                break;
                            case BROWSE_OPTION_VIEW_BY_GENRE:
                                browseBooksByGenre();
                                break;
                            case BROWSE_OPTION_VIEW_BOOK_DETAILS:
                                browseViewDetails();
                                break;
                            case BROWSE_OPTION_MAIN_MENU:
                                System.out.println("Returning to the main menu.");
                                break;
                            default:
                                throw new Prompt.OptionOutOfBoundsException(
                                                    "Browse menu option doesn't exist");
                        }
                    } while (browseChoice != Browse_Options.BROWSE_OPTION_MAIN_MENU.ordinal() + 1);
                    break;
                case MAIN_OPTION_QUIT:
                    System.out.println("Please come again!");
                    break;
                default:
                    throw new Prompt.OptionOutOfBoundsException("Main menu option doesn't exist");
            }
        } while (mainChoice != Main_Options.MAIN_OPTION_QUIT.ordinal() + 1);
    }
}