LibrarySystem.java

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class LibrarySystem {

    private static Map<Integer, Books> books = new HashMap<>();
    private static int bookCounter = 1; //system's book ID number starts at 1
    private static Scanner scanner = new Scanner(System.in);


    //adds a book to the system. Asks for the book's title, genre, page count. Makes checked in true when send to maps
    public static void addBook(){
        System.out.println("Enter book's title.");
        String title = scanner.nextLine();
        System.out.println("Enter book's genre.");
        String genre = scanner.nextLine();
        System.out.println("Enter book's page count.");
        int pageCount = scanner.nextInt();

        books.put(bookCounter, new Books(title,genre,pageCount));
        System.out.println("The book has been successfully been added to the system. It's # is: "+ bookCounter+"\n");
        bookCounter++; //increments for the next book.

    }
    
    //checks in a book which changes the availability status
    public static void checkInBook() {
    	System.out.println("Enter the book's #: ");
        int bookIndex = scanner.nextInt();
        scanner.nextLine();
        
        Books userBook = books.get(bookIndex);
        if (userBook.isCheckedIn()==false) {
        	userBook.checkIn();
            System.out.println("You have checked in: " + userBook.getTitle());
        } else if (userBook.isCheckedIn()) {
            System.out.println("The book is already checked in.");
        } else {
            System.out.println("Book not found.");
        }
        
    }
    
    //checks out a book which changes the availability status
 // Check out a book
    public static void checkOutBook() {
        System.out.println("Enter the ID of the book to check out:");
        int id = scanner.nextInt();
        scanner.nextLine(); // Consume newline

        Books book = books.get(id);
        if (book != null && book.isCheckedIn()) {
            book.checkOut();
            System.out.println("You have checked out: " + book.getTitle());
        } else if (book != null) {
            System.out.println("The book is already checked out.");
        } else {
            System.out.println("Book not found.");
        }
        
       // books.put(bookCounter, book);
        
    }
    
    public static void viewBooks() {
    	books.forEach((key, value) -> System.out.println("\nBook " + key + ": " + "\nTitle - " + value.getTitle() + "\nGenre - " + value.getGenre() + "\nPage Count - " + value.getPageCount() + "\nAvailable - " + value.isCheckedIn()));
    }
    
    public static void banBook() {
    		System.out.println("Enter the book's #: ");
        int bookIndex = scanner.nextInt();
        scanner.nextLine();
        
        Books userBook = books.get(bookIndex);
    	
    		books.remove(bookIndex);
    		
    		System.out.println("You have banned " + userBook.getTitle() + "...but now you must replace it >:(");
    		
    		System.out.println("Enter book's title.");
        String title = scanner.nextLine();
        System.out.println("Enter book's genre.");
        String genre = scanner.nextLine();
        System.out.println("Enter book's page count.");
        int pageCount = scanner.nextInt();

        books.put(bookIndex, new Books(title,genre,pageCount));
        
        System.out.println("You have successfully swapped " + userBook.getTitle() + " with " + title + " :D");
    }

	public static void displayMenu() {
		int choice;
		do {
			System.out.println("Library Menu:");
			System.out.println("1. Add Book");
			System.out.println("2. View All Books");
			System.out.println("3. Check Out Book");
			System.out.println("4. Check In Book");
			System.out.println("5. Ban A Book");
			System.out.println("6. Exit");
			System.out.print("Enter your choice: ");
			choice = scanner.nextInt();
			scanner.nextLine(); // Consume newline

			switch (choice) {
			case 1:
				addBook();
				break;
			case 2:
				viewBooks();
				break;
			case 3:
				checkOutBook();
				break;
			case 4:
				checkInBook();
				break;
			case 5:
				banBook();
				break;
			case 6:
				System.out.println("Exiting the system. Goodbye!");
				break;
			default:
				System.out.println("Invalid choice. Please try again.");
			}
		} while (choice != 6);
	}

	public static void main(String[] args) {
		//Create default books in the library
        books.put(bookCounter, new Books("Hunger Games", "Young adult", 374));
        bookCounter++;
        books.put(bookCounter, new Books("Daemon", "Sci-fi", 444));
        bookCounter++;
        books.put(bookCounter, new Books("Where the Sidewalk Ends", "Children Story", 176));
        bookCounter++;
        books.put(bookCounter, new Books("The Giving Tree", "Children Story", 52));
        bookCounter++;
		
		displayMenu();
	}


public Books get(int id) {
	
	return books.get(id);
}

}