java-package test111;

import java.util.*; import java.text.SimpleDateFormat; import java.util.stream.Collectors;

// ??? class Book { private String isbn; private String title; private String author; private String category; private int stock;

public Book(String isbn, String title, String author, String category, int stock) {
    this.isbn = isbn;
    this.title = title;
    this.author = author;
    this.category = category;
    this.stock = stock;
}

// Getter ? Setter ??
public String getIsbn() { return isbn; }
public String getTitle() { return title; }
public String getAuthor() { return author; }
public String getCategory() { return category; }
public int getStock() { return stock; }
public void setStock(int stock) { this.stock = stock; }

@Override
public String toString() {
    return "ISBN: " + isbn + ", Title: " + title + ", Author: " + author + ", Category: " + category + ", Stock: " + stock;
}

}

// ??? class Reader { private String cardId; private String name; private String contact; private int maxBooks;

public Reader(String cardId, String name, String contact, int maxBooks) {
    this.cardId = cardId;
    this.name = name;
    this.contact = contact;
    this.maxBooks = maxBooks;
}

// Getter ? Setter ??
public String getCardId() { return cardId; }
public String getName() { return name; }
public String getContact() { return contact; }
public int getMaxBooks() { return maxBooks; }
public void setMaxBooks(int maxBooks) { this.maxBooks = maxBooks; }

@Override
public String toString() {
    return "Card ID: " + cardId + ", Name: " + name + ", Contact: " + contact + ", Max Books: " + maxBooks;
}

}

// ????? class BorrowRecord { private String bookIsbn; private String readerCardId; private Date borrowDate; private Date dueDate; private boolean isReturned;

public BorrowRecord(String bookIsbn, String readerCardId) {
    this.bookIsbn = bookIsbn;
    this.readerCardId = readerCardId;
    this.borrowDate = new Date();
    this.dueDate = addDaysToCalendar(30); // ???????30??
    this.isReturned = false;
}

// Getter ? Setter ??
public String getBookIsbn() { return bookIsbn; }
public String getReaderCardId() { return readerCardId; }
public Date getBorrowDate() { return borrowDate; }
public Date getDueDate() { return dueDate; }
public boolean isReturned() { return isReturned; }
public void setReturned(boolean returned) { isReturned = returned; }

// ?????????
public int getOverdueDays() {
    if (!isReturned) {
        long diff = new Date().getTime() - dueDate.getTime();
        return (int) (diff / (1000 * 60 * 60 * 24));
    }
    return 0;
}

public double getFine() {
    return getOverdueDays() * 0.5; // ??1???0.5?
}

// ???????30?????
private Date addDaysToCalendar(int days) {
    Calendar cal = Calendar.getInstance();
    cal.setTime(borrowDate);
    cal.add(Calendar.DAY_OF_MONTH, days);
    return cal.getTime();
}

@Override
public String toString() {
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
    return "Book ISBN: " + bookIsbn + ", Reader Card ID: " + readerCardId + ", Borrow Date: " + sdf.format(borrowDate) + ", Due Date: " + sdf.format(dueDate) + ", Returned: " + isReturned;
}

}

// ?????? class LibrarySystem { private Map<String, Book> books = new HashMap<>(); // ISBN -> Book private List readers = new ArrayList<>(); // ???? private List borrowRecords = new ArrayList<>(); // ??????

// ????
public void addBook(Book book) {
    books.put(book.getIsbn(), book);
}

// ????
public void removeBook(String isbn) {
    books.remove(isbn);
}

// ????
public Book searchBookByIsbn(String isbn) {
    return books.get(isbn);
}

// ????
public void addReader(Reader reader) {
    readers.add(reader);
}

// ????

// ???? public void borrowBook(String isbn, String readerCardId) { Book book = searchBookByIsbn(isbn); Reader reader = readers.stream() .filter(r -> r.getCardId().equals(readerCardId)) .findFirst() .orElse(null);

    if (book == null || reader == null) {
        System.out.println("????????");
        return;
    }

    if (book.getStock() <= 0) {
        System.out.println("???????");
        return;
    }

    // ???????????????
    long borrowedCount = borrowRecords.stream()
            .filter(record -> record.getReaderCardId().equals(readerCardId) && !record.isReturned())
            .count();
    if (borrowedCount >= reader.getMaxBooks()) {
        System.out.println("????????????");
        return;
    }

    // ??????
    BorrowRecord record = new BorrowRecord(isbn, readerCardId);
    borrowRecords.add(record);

    // ??????
    book.setStock(book.getStock() - 1);
    System.out.println("?????");
}

// ????
public void returnBook(String isbn, String readerCardId) {
    BorrowRecord record = borrowRecords.stream()
            .filter(r -> r.getBookIsbn().equals(isbn) && r.getReaderCardId().equals(readerCardId) && !r.isReturned())
            .findFirst()
            .orElse(null);

    if (record == null) {
        System.out.println("????????????");
        return;
    }

    // ?????????
    int overdueDays = record.getOverdueDays();
    double fine = record.getFine();

    if (overdueDays > 0) {
        System.out.println("????? " + overdueDays + " ???? " + fine + " ??");
    }

    // ??????
    record.setReturned(true);

    // ??????
    Book book = searchBookByIsbn(isbn);
    if (book != null) {
        book.setStock(book.getStock() + 1);
    }
    System.out.println("?????");
}

// ?????????????? TOP10? public List getMostPopularBooks() { Map<String, Integer> bookBorrowCount = new HashMap<>(); for (BorrowRecord record : borrowRecords) { if (!record.isReturned()) continue; // ????????? bookBorrowCount.put(record.getBookIsbn(), bookBorrowCount.getOrDefault(record.getBookIsbn(), 0) + 1); }

    // ???????
    List<Book> sortedBooks = bookBorrowCount.entrySet().stream()
            .sorted(Map.Entry.<String, Integer>comparingByValue().reversed())
            .map(entry -> books.get(entry.getKey()))
            .collect(Collectors.toList());

    if (sortedBooks.isEmpty()) {
        System.out.println("???????");
        return new ArrayList<>();
    }

    return sortedBooks.subList(0, Math.min(10, sortedBooks.size()));
}

// ????????????1?????
public void cleanExpiredRecords() {
    long oneYearInMillis = 365 * 24 * 60 * 60 * 1000;
    Date oneYearAgo = new Date(System.currentTimeMillis() - oneYearInMillis);

    long cleanedCount = borrowRecords.stream()
            .filter(record -> record.isReturned() && record.getBorrowDate().before(oneYearAgo))
            .count();

    borrowRecords.removeIf(record -> record.isReturned() && record.getBorrowDate().before(oneYearAgo));
    System.out.println("???????????? " + cleanedCount + " ????");
}

// ????
public void exportData() {
    System.out.println("?????");
    books.values().forEach(System.out::println);

    System.out.println("\n?????");
    readers.forEach(System.out::println);

    System.out.println("\n???????");
    borrowRecords.forEach(System.out::println);
}

}

// ?? public class Main { public static void main(String[] args) { pachong pachong1 = new pachong(); LibrarySystem librarySystem = new LibrarySystem();

    // ????
    librarySystem.addBook(new Book("9787111658607", "Java????", "Bruce Eckel", "???", 10));
    librarySystem.addBook(new Book("9787115555963", "Effective Java", "Joshua Bloch", "???", 5));
    librarySystem.addBook(new Book("9787111634630", "????", "Thomas H. Cormen", "???", 3));

    // ????
    librarySystem.addReader(new Reader("R001", "??", "12345678901", 5));
    librarySystem.addReader(new Reader("R002", "??", "09876543210", 5));

    // ????
    librarySystem.borrowBook("9787111658607", "R001");
    librarySystem.borrowBook("9787115555963", "R001");
    librarySystem.borrowBook("9787111634630", "R002");

    // ????
    librarySystem.returnBook("9787111658607", "R001");

    // ?????????
    System.out.println("\n????????");
    librarySystem.getMostPopularBooks().forEach(System.out::println);

    // ????
    System.out.println("\n?????");
    librarySystem.exportData();
}

}