nst-personal · Feb 10, 2024 · Feb 10, 2024 · Feb 10, 2024 · Feb 10, 2024 · Feb 10, 2024
diff --git a/src/main/java/Calculator.java b/src/main/java/Calculator.java
@@ -0,0 +1,25 @@
+import java.util.ArrayList;
+import java.util.List;
+
+public class Calculator {
+    private List<Product> productList = new ArrayList<>();
+    private double currentSum;
+
+    public void add(Product product) {
+        productList.add(product);
+        addToSum(product.getPrice());
+    }
+
+    private void addToSum(double price) {
+        currentSum += price;
+    }
+
+    public double getSum() {
+        return currentSum;
+    }
+
+    public List<Product> getProducts() {
+        return productList;
+    }
+
+}
diff --git a/src/main/java/Main.java b/src/main/java/Main.java
@@ -1,6 +1,83 @@
+import java.util.Scanner;
 
 public class Main {
     public static void main(String[] args) {
-        System.out.println("Hello world!");
+        Calculator calculator = new Calculator();
+        Scanner scanner = new Scanner(System.in);
+        int numberOfPeople = getNumberOfPeople(scanner);
+        fillProducts(calculator, scanner);
+        displayProducts(calculator);
+        calculateSumPerPerson(calculator, numberOfPeople);
+        scanner.close();
     }
+    private static int getNumberOfPeople(Scanner scanner) {
+        int numberOfPeople = 0;
+        while (numberOfPeople <= 1) {
+            System.out.println("Enter number of people to split the bill");
+            if (scanner.hasNextInt()) {
+                numberOfPeople = scanner.nextInt();
+                if (numberOfPeople <= 0) {
+                    System.out.println("The number of people must be positive");
+                } else if (numberOfPeople == 1) {
+                    System.out.println("There is no point in counting");
+                }
+            } else {
+                System.out.println("Invalid input. Please enter value");
+                scanner.next();
+            }
+        }
+        return numberOfPeople;
+    }
+
+    private static void fillProducts(Calculator calculator, Scanner scanner) {
+        System.out.println("Add product");
+        String action = null;
+        while (action == null || !action.equalsIgnoreCase("done")) {
+            addProduct(scanner, calculator);
+            System.out.println("Do you want to add more? Fill 'done' to complete");
+            action = scanner.next();
+        }
+    }
+
+    private static void addProduct(Scanner scanner, Calculator calculator) {
+        String name = null;
+        while (name == null || name.trim().isEmpty()) {
+            System.out.println("Enter name of product");
+            name = scanner.next();
+        }
+        double price = 0.0;
+        while (price <= 0 || isValueHas2Digits(price)) {
+            System.out.println("Enter price of product");
+            if (scanner.hasNextDouble()) {
+                price = scanner.nextDouble();
+                if (price <= 0 || isValueHas2Digits(price)) {
+                    System.out.println("The number of people must be positive and has 2 digits after dot");
+                }
+            } else {
+                System.out.println("Invalid input. Please enter value");
+                scanner.next();
+            }
+        }
+        calculator.add(new Product(name, price));
+        System.out.println("Product added");
+    }
+
+    private static boolean isValueHas2Digits(double price) {
+        return Math.abs(price * 100 - Math.round(price * 100)) > 0.001;
+    }
+
+    private static void displayProducts(Calculator calculator) {
+        System.out.println("Added products:");
+        RubleFormatter rubleFormatter = new RubleFormatter();
+        for (Product product: calculator.getProducts()) {
+            System.out.printf("%s || %.2f %s\n", product.getName(), product.getPrice(), rubleFormatter.format(product.getPrice()));
+        }
+    }
+
+    private static void calculateSumPerPerson(Calculator calculator, int numberOfPeople) {
+        double sumPerPerson = calculator.getSum() / numberOfPeople;
+        RubleFormatter rubleFormatter = new RubleFormatter();
+        System.out.printf("Sum per person  ===>  %.2f %s\n", sumPerPerson, rubleFormatter.format(sumPerPerson));
+    }
+
 }
diff --git a/src/main/java/Product.java b/src/main/java/Product.java
@@ -0,0 +1,17 @@
+public class Product {
+    private String name;
+    private double price;
+    public Product(String name, double price) {
+        this.name = name;
+        this.price = price;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public double getPrice() {
+        return price;
+    }
+
+}
diff --git a/src/main/java/RubleFormatter.java b/src/main/java/RubleFormatter.java
@@ -0,0 +1,16 @@
+public class RubleFormatter {
+    public String format(double number) {
+        int floorNumber = (int) Math.floor(number);
+        int lastDigit = floorNumber % 10;
+        int lastTwoDigits = floorNumber % 100;
+        if (lastTwoDigits >= 11 && lastTwoDigits <= 19) {
+            return "rubley";
+        } else if (lastDigit == 1) {
+            return "ruble";
+        } else if (lastDigit >= 2 && lastDigit <= 4) {
+            return "rublya";
+        } else {
+            return "rubley";
+        }
+    }
+}