Library Management System

import java.util.*;
import java.time.*;
import java.time.temporal.ChronoUnit;

class Book {
    private String bookId;
    private String title;
    private String author;
    private String category;
    private boolean isAvailable;
    private String issuedTo;
    private LocalDate issueDate;
    private LocalDate dueDate;
    
    public Book(String bookId, String title, String author, String category) {
        this.bookId = bookId;
        this.title = title;
        this.author = author;
        this.category = category;
        this.isAvailable = true;
        this.issuedTo = null;
    }
    
    public String getBookId() { return bookId; }
    public String getTitle() { return title; }
    public String getAuthor() { return author; }
    public String getCategory() { return category; }
    public boolean isAvailable() { return isAvailable; }
    public String getIssuedTo() { return issuedTo; }
    public LocalDate getDueDate() { return dueDate; }
    
    public void issueBook(String memberId) {
        this.isAvailable = false;
        this.issuedTo = memberId;
        this.issueDate = LocalDate.now();
        this.dueDate = issueDate.plusDays(14); // 14 days loan period
    }
    
    public int returnBook() {
        this.isAvailable = true;
        this.issuedTo = null;
        
        // Calculate fine if overdue
        LocalDate today = LocalDate.now();
        int fine = 0;
        if (today.isAfter(dueDate)) {
            long daysOverdue = ChronoUnit.DAYS.between(dueDate, today);
            fine = (int) (daysOverdue * 10); // $10 per day fine
        }
        
        this.issueDate = null;
        this.dueDate = null;
        return fine;
    }
    
    public void displayBookInfo() {
        System.out.println("\n┌─────────────────────────────────────────┐");
        System.out.println("│ Book ID     : " + bookId);
        System.out.println("│ Title       : " + title);
        System.out.println("│ Author      : " + author);
        System.out.println("│ Category    : " + category);
        System.out.println("│ Status      : " + (isAvailable ? "Available" : "Issued"));
        if (!isAvailable) {
            System.out.println("│ Issued To   : " + issuedTo);
            System.out.println("│ Due Date    : " + dueDate);
        }
        System.out.println("└─────────────────────────────────────────┘");
    }
}

class Member {
    private String memberId;
    private String name;
    private String email;
    private String phone;
    private ArrayList<String> borrowedBooks;
    private ArrayList<String> borrowHistory;
    
    public Member(String memberId, String name, String email, String phone) {
        this.memberId = memberId;
        this.name = name;
        this.email = email;
        this.phone = phone;
        this.borrowedBooks = new ArrayList<>();
        this.borrowHistory = new ArrayList<>();
    }
    
    public String getMemberId() { return memberId; }
    public String getName() { return name; }
    public ArrayList<String> getBorrowedBooks() { return borrowedBooks; }
    
    public void borrowBook(String bookId) {
        borrowedBooks.add(bookId);
        borrowHistory.add("Borrowed: " + bookId + " on " + LocalDate.now());
    }
    
    public void returnBook(String bookId) {
        borrowedBooks.remove(bookId);
        borrowHistory.add("Returned: " + bookId + " on " + LocalDate.now());
    }
    
    public void displayMemberInfo() {
        System.out.println("\n╔═════════════════════════════════════════╗");
        System.out.println("║         MEMBER INFORMATION              ║");
        System.out.println("╠═════════════════════════════════════════╣");
        System.out.println("║ Member ID   : " + memberId);
        System.out.println("║ Name        : " + name);
        System.out.println("║ Email       : " + email);
        System.out.println("║ Phone       : " + phone);
        System.out.println("║ Books Issued: " + borrowedBooks.size());
        System.out.println("╚═════════════════════════════════════════╝");
        
        if (!borrowedBooks.isEmpty()) {
            System.out.println("\nCurrently Borrowed Books:");
            for (String bookId : borrowedBooks) {
                System.out.println("  • " + bookId);
            }
        }
    }
    
    public void displayBorrowHistory() {
        System.out.println("\n───── Borrow History for " + name + " ─────");
        if (borrowHistory.isEmpty()) {
            System.out.println("No borrowing history");
        } else {
            for (String record : borrowHistory) {
                System.out.println("  " + record);
            }
        }
        System.out.println("─────────────────────────────────────────");
    }
}

class Library {
    private HashMap<String, Book> books;
    private HashMap<String, Member> members;
    private int bookCounter;
    private int memberCounter;
    
    public Library() {
        books = new HashMap<>();
        members = new HashMap<>();
        bookCounter = 1000;
        memberCounter = 5000;
        
        // Add some sample books
        addSampleBooks();
    }
    
    private void addSampleBooks() {
        addBook("Effective Java", "Joshua Bloch", "Programming");
        addBook("Clean Code", "Robert Martin", "Programming");
        addBook("The Pragmatic Programmer", "Hunt & Thomas", "Programming");
        addBook("A Tale of Two Cities", "Charles Dickens", "Fiction");
        addBook("1984", "George Orwell", "Fiction");
    }
    
    public String addBook(String title, String author, String category) {
        String bookId = "BK" + (++bookCounter);
        Book book = new Book(bookId, title, author, category);
        books.put(bookId, book);
        System.out.println("✓ Book added successfully! Book ID: " + bookId);
        return bookId;
    }
    
    public String registerMember(String name, String email, String phone) {
        String memberId = "MEM" + (++memberCounter);
        Member member = new Member(memberId, name, email, phone);
        members.put(memberId, member);
        System.out.println("✓ Member registered successfully! Member ID: " + memberId);
        return memberId;
    }
    
    public boolean issueBook(String bookId, String memberId) {
        Book book = books.get(bookId);
        Member member = members.get(memberId);
        
        if (book == null) {
            System.out.println("✗ Book not found!");
            return false;
        }
        
        if (member == null) {
            System.out.println("✗ Member not found!");
            return false;
        }
        
        if (!book.isAvailable()) {
            System.out.println("✗ Book is currently issued to another member");
            return false;
        }
        
        if (member.getBorrowedBooks().size() >= 3) {
            System.out.println("✗ Member has reached maximum borrow limit (3 books)");
            return false;
        }
        
        book.issueBook(memberId);
        member.borrowBook(bookId);
        
        System.out.println("\n✓ Book issued successfully!");
        System.out.println("  Book: " + book.getTitle());
        System.out.println("  Member: " + member.getName());
        System.out.println("  Due Date: " + book.getDueDate());
        
        return true;
    }
    
    public boolean returnBook(String bookId, String memberId) {
        Book book = books.get(bookId);
        Member member = members.get(memberId);
        
        if (book == null || member == null) {
            System.out.println("✗ Invalid book or member ID");
            return false;
        }
        
        if (book.isAvailable()) {
            System.out.println("✗ This book is not currently issued");
            return false;
        }
        
        int fine = book.returnBook();
        member.returnBook(bookId);
        
        System.out.println("\n✓ Book returned successfully!");
        if (fine > 0) {
            System.out.println("  ⚠ Overdue fine: $" + fine);
            System.out.println("  Please pay the fine at the counter");
        } else {
            System.out.println("  No fine. Thank you for returning on time!");
        }
        
        return true;
    }
    
    public void searchBooks(String keyword) {
        keyword = keyword.toLowerCase();
        boolean found = false;
        
        System.out.println("\n╔═════════════════════════════════════════╗");
        System.out.println("║         SEARCH RESULTS                  ║");
        System.out.println("╚═════════════════════════════════════════╝");
        
        for (Book book : books.values()) {
            if (book.getTitle().toLowerCase().contains(keyword) ||
                book.getAuthor().toLowerCase().contains(keyword)) {
                book.displayBookInfo();
                found = true;
            }
        }
        
        if (!found) {
            System.out.println("\nNo books found matching: " + keyword);
        }
    }
    
    public void displayAllBooks() {
        System.out.println("\n╔═════════════════════════════════════════╗");
        System.out.println("║         ALL BOOKS IN LIBRARY            ║");
        System.out.println("╚═════════════════════════════════════════╝");
        
        for (Book book : books.values()) {
            book.displayBookInfo();
        }
    }
    
    public void displayAvailableBooks() {
        System.out.println("\n╔═════════════════════════════════════════╗");
        System.out.println("║         AVAILABLE BOOKS                 ║");
        System.out.println("╚═════════════════════════════════════════╝");
        
        boolean found = false;
        for (Book book : books.values()) {
            if (book.isAvailable()) {
                book.displayBookInfo();
                found = true;
            }
        }
        
        if (!found) {
            System.out.println("\nNo books available at the moment");
        }
    }
    
    public Member getMember(String memberId) {
        return members.get(memberId);
    }
    
    public Book getBook(String bookId) {
        return books.get(bookId);
    }
}

public class LibraryManagement {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        Library library = new Library();
        
        System.out.println("╔═══════════════════════════════════════════╗");
        System.out.println("║   JAVAPEDIA LIBRARY MANAGEMENT SYSTEM     ║");
        System.out.println("╚═══════════════════════════════════════════╝\n");
        
        boolean running = true;
        
        while (running) {
            System.out.println("\n" + "═".repeat(45));
            System.out.println("              MAIN MENU");
            System.out.println("═".repeat(45));
            System.out.println("BOOK OPERATIONS:");
            System.out.println("  1. Add New Book");
            System.out.println("  2. Search Books");
            System.out.println("  3. Display All Books");
            System.out.println("  4. Display Available Books");
            System.out.println("\nMEMBER OPERATIONS:");
            System.out.println("  5. Register New Member");
            System.out.println("  6. View Member Info");
            System.out.println("  7. View Member History");
            System.out.println("\nTRANSACTIONS:");
            System.out.println("  8. Issue Book");
            System.out.println("  9. Return Book");
            System.out.println("\n  0. Exit");
            System.out.println("═".repeat(45));
            System.out.print("Enter your choice: ");
            
            int choice = scanner.nextInt();
            scanner.nextLine();
            
            switch (choice) {
                case 1:
                    System.out.print("\nEnter book title: ");
                    String title = scanner.nextLine();
                    System.out.print("Enter author name: ");
                    String author = scanner.nextLine();
                    System.out.print("Enter category: ");
                    String category = scanner.nextLine();
                    library.addBook(title, author, category);
                    break;
                    
                case 2:
                    System.out.print("\nEnter title or author to search: ");
                    String keyword = scanner.nextLine();
                    library.searchBooks(keyword);
                    break;
                    
                case 3:
                    library.displayAllBooks();
                    break;
                    
                case 4:
                    library.displayAvailableBooks();
                    break;
                    
                case 5:
                    System.out.print("\nEnter member name: ");
                    String name = scanner.nextLine();
                    System.out.print("Enter email: ");
                    String email = scanner.nextLine();
                    System.out.print("Enter phone: ");
                    String phone = scanner.nextLine();
                    library.registerMember(name, email, phone);
                    break;
                    
                case 6:
                    System.out.print("\nEnter member ID: ");
                    String memId = scanner.nextLine();
                    Member member = library.getMember(memId);
                    if (member != null) {
                        member.displayMemberInfo();
                    } else {
                        System.out.println("✗ Member not found!");
                    }
                    break;
                    
                case 7:
                    System.out.print("\nEnter member ID: ");
                    String memId2 = scanner.nextLine();
                    Member member2 = library.getMember(memId2);
                    if (member2 != null) {
                        member2.displayBorrowHistory();
                    } else {
                        System.out.println("✗ Member not found!");
                    }
                    break;
                    
                case 8:
                    System.out.print("\nEnter book ID: ");
                    String bookId = scanner.nextLine();
                    System.out.print("Enter member ID: ");
                    String memId3 = scanner.nextLine();
                    library.issueBook(bookId, memId3);
                    break;
                    
                case 9:
                    System.out.print("\nEnter book ID: ");
                    String bookId2 = scanner.nextLine();
                    System.out.print("Enter member ID: ");
                    String memId4 = scanner.nextLine();
                    library.returnBook(bookId2, memId4);
                    break;
                    
                case 0:
                    System.out.println("\n╔═══════════════════════════════════════════╗");
                    System.out.println("║  Thank you for using Library System!      ║");
                    System.out.println("╚═══════════════════════════════════════════╝\n");
                    running = false;
                    break;
                    
                default:
                    System.out.println("\n✗ Invalid choice!");
            }
        }
        
        scanner.close();
    }
}