Bookstore.java

import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class Bookstore {
    public static void main(String[] args) {
        Inventory inventory = new Inventory();
        Admin admin = new Admin("admin", "admin123");
        Customer[] customers = {
                new Customer("user1", "user123", "user1@example.com"),
                new Customer("user2", "user456", "user2@example.com"),
                new Customer("user3", "user789", "user3@example.com")
        };
        Book[] books = {
                new Book("Java Programming", "John Doe", 29.99),
                new Book("Python for Beginners", "Jane Smith", 19.99),
                new Book("C++ Programming", "Alice Johnson", 34.99),
                new Book("Data Structures in Java", "Bob Wilson", 27.99),
                new Book("JavaScript Fundamentals", "Mary Brown", 24.99),
                new Book("SQL Essentials", "David Davis", 22.99),
                new Book("Algorithms and Complexity", "Eva Evans", 39.99),
                new Book("Web Development with React", "Frank Lee", 29.99),
                new Book("Artificial Intelligence", "Grace Adams", 44.99),
                new Book("Machine Learning Basics", "Henry Harris", 36.99)
        };

        // Add books to inventory
        System.out.println("Adding books to inventory...");
        for (Book book : books) {
            admin.addBookToInventory(book);
            inventory.addBook(book);
        }

        // Simulate purchases and orders
        System.out.println("\nSimulating purchases and orders...");
        Order[] orders = new Order[customers.length];
        for (int i = 0; i < customers.length; i++) {
            orders[i] = new Order(customers[i]);
            orders[i].addBookToOrder(books[i * 2]);
            orders[i].addBookToOrder(books[i * 2 + 1]);
            orders[i].completeOrder();
        }

        // Create and add random reviews
        List<Review> randomReviews = generateRandomReviews(customers, books);
        ReviewManager reviewManager = new ReviewManager(randomReviews);

        // Calculate and display average ratings for each book
        DecimalFormat decimalFormat = new DecimalFormat("#.00");

        for (Book book : books) {
            List<Review> bookReviews = reviewManager.getReviewsForBook(book);

            System.out.println("Reviews for " + book.getTitle() + ":");
            if (bookReviews.isEmpty()) {
                System.out.println("No reviews available.");
            } else {
                double totalRating = 0;
                for (Review review : bookReviews) {
                    System.out.println(review);
                    totalRating += review.getRating();
                }
                double averageRating = totalRating / bookReviews.size();
                System.out.println("Average Rating: " + decimalFormat.format(averageRating));
            }
            System.out.println();
        }

        // Process payments and display rounded amounts
        for (int i = 0; i < customers.length; i++) {
            double totalAmount = books[i * 2].getPrice() + books[i * 2 + 1].getPrice();
            if (Payment.processPayment(customers[i], totalAmount)) {
                System.out.println("Payment successful for " + customers[i].getUsername() + " - $"
                        + decimalFormat.format(totalAmount));
            } else {
                System.out.println("Payment failed for " + customers[i].getUsername());
            }
        }
    }

    // Generate random reviews with concise comments based on rating
    private static List<Review> generateRandomReviews(Customer[] customers, Book[] books) {
        List<Review> randomReviews = new ArrayList<>();
        Random random = new Random();

        for (Customer customer : customers) {
            for (Book book : books) {
                int rating = random.nextInt(5) + 1; // Random rating between 1 and 5
                String[] comments = { "Terrible! Do not get!", "Not that great...", "Good.", "Really good!",
                        "Highly recommend!" };
                randomReviews.add(new Review(customer, book, comments[rating - 1], rating));
            }
        }

        return randomReviews;
    }
}