Menu

import java.io.File;
import java.io.FileNotFoundException;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.BufferedReader;
import java.util.ArrayList;
import java.util.Scanner;
import java.util.List;

public class Main {
    private static final String REVIEWS_FILE = "reviews.txt";
    public static final String RECORDS_FILE = "UsernameNpassword";

    List<String> cartitems = new ArrayList<>();
    List<Double> cartPrices = new ArrayList<>();
    List<Integer> cartQuantities = new ArrayList<>();


    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String currentUser = null; //Store Username

        String[] coffeeNames = {"Americano", "Espresso", "Latte", "Cappuccino", "Mocha", "Flat White", "Back to Menu"};
        double[] coffeePrices = {2.50, 2.75, 3.00, 3.50, 4.00, 3.25, 0.00};

        String[] foodNames = {"Fried rice", "Noodle", "Beef stewed with bread", "Brownie", "Back to Menu"};
        double[] foodPrices = {3.25, 3.00, 2.50, 1.00, 0.00};//Store the Username

        while (true) {
            System.out.println("Choose an operation:");
            System.out.println("1. Sign-Up");
            System.out.println("2. Login");
            System.out.println("3. Exit");
            String choice = scanner.nextLine();

            switch (choice) {
                case "1":
                    currentUser = register();
                    if (currentUser != null) {
                        System.out.println("Welcome to Javalicious " + currentUser);
                    } else {
                        System.out.println("Registration failed");
                        continue;
                    }
                    break;
                case "2":
                    currentUser = checkLoginUsernamePassword();
                    if (currentUser == null) {
                        System.out.println("Welcome to Javalicious " + currentUser);
                        continue;
                    }
                    break;
                case "3":
                    System.out.println("Exiting... Goodbye!");
                    scanner.close();
                    System.exit(0);
                default:
                    System.out.println("Invalid choice. Please try again.");
                    continue;
            }
            break;
        }
        List<CartItem> cart = new ArrayList<>();

        //Delivery or Pick Up
        while (true) {
            System.out.println("Pick up or order from our app?");
            String pickUpOrOrder = scanner.nextLine().trim();
            if (pickUpOrOrder.equalsIgnoreCase("order")) {
                System.out.print("Please provide your Gmail address: ");
                String gmailAddress = scanner.nextLine();
                break;
            } else if (pickUpOrOrder.equalsIgnoreCase("pick up")) {
                System.out.println("Got it, thank you!");
                break;
            } else {
                System.out.println("Invalid information.");
            }
        }

        while (true) {
            System.out.println("What would you like to do?");
            System.out.println("1. Coffee");
            System.out.println("2. Food");
            System.out.println("3. Go to Cart");
            System.out.println("4. Remove item");
            System.out.println("5. Proceed to checkout");
            System.out.println("6. Exit");
            System.out.println("Please choose an option:");
            String choice = scanner.nextLine().trim();

            switch (choice) {
                case "1":
                    addItem(scanner, "Coffee", coffeeNames, coffeePrices, cart);
                    break;
                case "2":
                    addItem(scanner, "Food", foodNames, foodPrices, cart);
                    break;
                case "3":
                    viewCart(cart);
                    break;
                case "4":
                    removeItem(scanner, cart);
                    break;
                case "5":
                    printCart(cart);
                    System.out.println("Thank you for your order 🙏 ");
                    break;
                case "6": System.exit(0);    
                default:
                    System.out.println("Invalid choice. Please try again.");
                    continue;

            }
            if (choice.equals("5")) break;
        }
        System.out.println("Would You like to leave a review 😊");
        Scanner input = new Scanner(System.in);
        String choice = input.nextLine();
        while (true) {
            if (choice.equals("yes")) {
                leaveReview(currentUser);
                break;
            } else if (choice.equals("no")) {
                System.out.println("Have a great day!!");
                break;
            }
            else {
                System.out.println("Invalid choice. Please try again.");
            }
        }

        displayReviews();
        scanner.close();
    }

    public static void addItem (Scanner scanner, String type, String[] items, double[] prices, List<CartItem> cart) {
        System.out.println("\n===== " + type + " Menu =====");
        for (int i = 0; i < items.length; i++) {
            System.out.printf("%d. %s - $%.2f%n" , i + 1, items[i], prices[i]);
        }
        int choice = -1;
        while (true) {
            System.out.print("Enter the number from the list: ");
            if (scanner.hasNextInt()) {
                choice = scanner.nextInt();
                scanner.nextLine();
                if (choice >= 1 && choice <= items.length) {
                    break;
                } else {
                    System.out.println("Please enter the number of the item from the list.");
                }
            } else {
                System.out.println("Sorry, please enter a number on the list.");
                scanner.nextLine();
            }
        }

        String item = items[choice - 1];
        double price = prices[choice - 1];

        if (item.equalsIgnoreCase("Back to Menu")) return;
        int quantity = -1;
        while (true) {
            System.out.print("Enter quantity: ");
            if (scanner.hasNextInt()) {
                quantity = scanner.nextInt();
                scanner.nextLine(); // consume newline
                if (quantity > 0) {
                    break;
                } else {
                    System.out.println("Hmm. Please buy at least one item.");
                }
            } else {
                System.out.println("Sorry, please enter a number.");
                scanner.nextLine(); // clear invalid input
            }
        }

        cart.add(new CartItem(item, quantity, price));
        System.out.println(item + " added to the cart.");
    }

    public static void removeItem (Scanner scanner, List<CartItem> cart) {
        if (cart.isEmpty()) {
            System.out.println("Sorry, You currently have no item in the cart.");
            return;
        }
        viewCart(cart);
        System.out.print("Enter the number of the item you would like to remove:");
        int index = scanner.nextInt();
        scanner.nextLine();

        if (index < 1 || index > cart.size()) {
            System.out.println("Sorry that number is not on the list");
            return;
        }

        CartItem removed = cart.remove(index -1 );
        return;
    }
    public static void viewCart(List<CartItem> cart) {
        if (cart.isEmpty()) {
            System.out.println("There is no item currently in your cart :(");
            
            return;
        }
        System.out.println("---------------------------");
        System.out.println("==== Your Items ====");
        System.out.println("---------------------------");
        double totalPrice = 0.0;
        int index = 1;
        for (CartItem item : cart) {
            System.out.println(index++ + ". " + item);
            totalPrice += item.getTotalPrice();
        }
        System.out.println("\n=====================");
        System.out.println("Total price: $" + totalPrice);
    }

    public static void printCart(List<CartItem> cart) {
        if (cart.isEmpty()) {
            System.out.println("There is no item currently in your cart :(");
            Scanner scanner = new Scanner(System.in);
            return;
        }
        System.out.println("---------------------------");
        System.out.println("==== Purchase Overview ====");
        System.out.println("---------------------------");
        double totalPrice = 0.0;
        int index = 1;
        for (CartItem item : cart) {
            System.out.println(index++ + ". " + item);
            totalPrice += item.getTotalPrice();
        }
        System.out.println("\n=====================");
        System.out.println("Total price: $" + totalPrice);
    }


    // Register Function
    public static String register() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter your Username:");
        String username = scanner.nextLine();
        while (!username.matches("[a-zA-Z0-9]+")) {
            System.out.println("Username should only contain alphanumeric characters. Please try again.");
            username = scanner.nextLine();
        }

        System.out.println("Enter your Password:");
        String password = scanner.nextLine();
        while (!password.matches("[a-zA-Z0-9]+")) {
            System.out.println("Password should only contain alphanumeric characters. Please try again.");
            password = scanner.nextLine();
        }

        try (BufferedWriter writer = new BufferedWriter(new FileWriter(RECORDS_FILE, true))) {
            writer.write(username + "," + password + "\n");
            System.out.println("You've successfully registered!");
            return username;
        } catch (IOException e) {
            System.out.println("Something went wrong.");
            return null;
        }
    }

    // Login Function
    public static String checkLoginUsernamePassword() {
        try {
            int attempts = 3;
            Scanner input = new Scanner(System.in);
            File file = new File(RECORDS_FILE);

            while (attempts > 0) {
                System.out.print("Enter username: ");
                String enteredUsername = input.nextLine();
                System.out.print("Enter password: ");
                String enteredPassword = input.nextLine();

                Scanner fileScanner = new Scanner(file);

                while (fileScanner.hasNextLine()) {
                    String line = fileScanner.nextLine();
                    String[] parts = line.split(",");
                    if (parts.length == 2) {
                        String username = parts[0];
                        String password = parts[1];
                        if (enteredUsername.equals(username) && enteredPassword.equals(password)) {
                            fileScanner.close();
                            System.out.println("You have successfully logged in!");
                            return username;
                        }
                    }
                }
                fileScanner.close();
                attempts--;
                System.out.println("Invalid username or password. " + attempts + " attempts remaining...");
            }
            System.out.println("Seems like we can't find your account. Let's create a new one");
        } catch (FileNotFoundException e) {
            System.out.println("Username not found.");
        }
        return null;
    }

    public static void displayReviews() {
        File file = new File(REVIEWS_FILE);
        if (!file.exists() || file.length() == 0) {
            System.out.println("No reviews available.");
            return;
        }

        try (BufferedReader reader = new BufferedReader(new FileReader(file))) {
            String line;
            boolean hasReviews = false;
            while ((line = reader.readLine()) != null) {
                hasReviews = true;
                String[] parts = line.split(",", 3);
                if (parts.length == 3) {
                    System.out.println("User: " + parts[0]);
                    System.out.println("Rating: " + parts[1]);
                    System.out.println("Comment: " + parts[2]);
                    System.out.println("------------------------------");
                }
            }
            if (!hasReviews) {
                System.out.println("No reviews available.");
            }
        } catch (IOException e) {
            System.out.println("Error reading reviews.");
        }
    }

    public static void leaveReview(String currentUser) {
        Scanner scanner = new Scanner(System.in);
        String ratingInput;
        while (true) {
            System.out.print("Enter your rating (1-5 stars): ");
            ratingInput = scanner.nextLine().trim();
            if (ratingInput.matches("[1-5]")) {
                ratingInput = "*".repeat(Integer.parseInt(ratingInput));
                break;
            } else if (ratingInput.matches("[*]{1,5}")) {
                break;
            } else {
                System.out.println("Invalid rating format. Please use 1 to 5 stars (*) or numbers (1-5).");
            }
        }

        System.out.print("Enter your review: ");
        String comment = scanner.nextLine();

        try (BufferedWriter writer = new BufferedWriter(new FileWriter(REVIEWS_FILE, true))) {
            writer.write(currentUser + "," + ratingInput + "," + comment + "\n");
            System.out.println("Thank you for your review," + currentUser);
        } catch (IOException e) {
            System.out.println("Error saving your review.");
        }
    }
}

class CartItem {
    String name;
    int quantity;
    double price;

    public CartItem(String name, int quantity, double price) {
        this.name = name;
        this.quantity = quantity;
        this.price = price;
    }

    public double getTotalPrice() {
        return price * quantity;
    }

    public String toString() {
        return name + "x" + quantity + " - $" + getTotalPrice();
    }
}