Veetver · Veetver · Mar 7, 2024
diff --git a/src/main/java/BillDivider.java b/src/main/java/BillDivider.java
@@ -0,0 +1,107 @@
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+import java.util.Scanner;
+
+public class BillDivider {
+    private final String INT_REGEX = "\\b(?<!\\.)\\d+(?!\\.)\\b";
+    private final String DOUBLE_REGEX = "\\d*\\.\\d{2}";
+    private int userCount;
+    private List<Item> itemList = new ArrayList<>();
+    private Scanner scanner = new Scanner(System.in);
+    PluralHelper pluralRubles = new PluralHelper("Рублю", "Рубля", "Рублей");
+    PluralHelper pluralGuests = new PluralHelper("гость", "гостя", "гостей");
+    public void createAndSplitBill() {
+        getUserCount();
+        requestItems();
+        intermediateResult();
+        splitBill();
+    }
+    private void getUserCount() {
+        this.userCount = readIntUntilValid("Введите кол-во человек: ");
+    }
+    private int readIntUntilValid(String requestMessage) {
+        System.out.print(requestMessage);
+        String value = scanner.nextLine();
+        boolean isValidValue = value.matches(INT_REGEX) && Integer.parseInt(value) > 1;
+
+        while (!isValidValue) {
+            System.out.println("Ошибка, введено неверное значение, попробуйте снова...");
+            System.out.print(requestMessage);
+
+            value = scanner.nextLine();
+            isValidValue = value.matches(INT_REGEX) && Integer.parseInt(value) > 1;
+        }
+
+        return Integer.parseInt(value);
+    }
+    private void requestItems() {
+        String input = "";
+        while (!input.equalsIgnoreCase("Завершить")) {
+            addItem(requestItem());
+            System.out.println("Желаете добавить еще один товар?\nВведите \"Завершить\", если хотите закончить добавление.");
+            input = scanner.nextLine();
+        }
+    }
+    private void addItem(Item newItem) {
+        itemList.add(newItem);
+
+        String newItemName = newItem.getName();
+        String line = "~".repeat(47 + newItemName.length());
+
+        System.out.println(line);
+        System.out.printf("Товар \"%s\", стоимостью %s успешно добавлен!%n", newItemName, pluralRubles.getFormattedPluralPattern(newItem.getPrice(), "%.2f %s"));
+        System.out.println(line);
+    }
+    private Item requestItem() {
+        String name = readStringUntilValid("Введите название товара: ");
+        double price = readDoubleUntilValid("Введите Стоимость (в формате рубли.копейки): ");
+        return new Item(name, price);
+    }
+    private String readStringUntilValid(String requestMessage) {
+        System.out.print(requestMessage);
+        String value = scanner.nextLine();
+
+        while (value.trim().isEmpty()) {
+            System.out.println("Ошибка, введено неверное значение, попробуйте снова...");
+            System.out.print(requestMessage);
+            value = scanner.nextLine();
+        }
+
+        return value;
+    }
+    private double readDoubleUntilValid(String requestMessage) {
+        System.out.print(requestMessage);
+        String value = scanner.nextLine();
+
+        while (!value.matches(DOUBLE_REGEX)) {
+            System.out.println("Ошибка, введено неверное значение, попробуйте снова...");
+            System.out.print(requestMessage);
+            value = scanner.nextLine();
+        }
+
+        return Double.parseDouble(value);
+    }
+    private void intermediateResult() {
+        int tabSpace = Math.max(15, Collections.max(itemList.stream().map(Item::getName).toList(), Comparator.comparing(String::length)).length());
+        String lineCurve = "~".repeat(tabSpace * 2 + 7);
+        String linePlain = "-".repeat(tabSpace * 2 + 7);
+
+        System.out.println(lineCurve);
+        System.out.println(pluralGuests.getFormattedPluralPattern(userCount, "Общий чек на %.0f %s"));
+        System.out.println(lineCurve);
+        System.out.println("Добавленные товары:");
+        System.out.println(lineCurve);
+        System.out.printf("| %-" + tabSpace + "s | %-" + tabSpace + "s |%n", "Название товара", "Стоимость");
+        System.out.println(linePlain);
+        for (Item item : itemList) {
+            System.out.printf("| %-" + tabSpace + "s | %-" + tabSpace + "s |%n", item.getName(), pluralRubles.getFormattedPluralPattern(item.getPrice(), "%.2f %s"));
+        }
+        System.out.println(linePlain);
+    }
+    private void splitBill() {
+        double perGuest = itemList.stream().map(Item::getPrice).reduce(0.0, Double::sum) / userCount;
+        System.out.println(pluralRubles.getFormattedPluralPattern(perGuest, "Каждый должен заплатить по %.2f %s"));
+    }
+}
diff --git a/src/main/java/Item.java b/src/main/java/Item.java
@@ -0,0 +1,35 @@
+import java.util.List;
+import java.util.Objects;
+
+public class Item {
+    private final String name;
+    private final double price;
+
+    public Item(String name, double price) {
+        this.name = name;
+        this.price = price;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public double getPrice() {
+        return price;
+    }
+
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        }
+        if (!(obj instanceof Item otherItem)) { return false; }
+        return otherItem.name.equals(this.name) && (otherItem.price == this.price);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(this.name, this.price);
+    }
+}
diff --git a/src/main/java/Main.java b/src/main/java/Main.java
@@ -1,6 +1,8 @@
+import java.util.Scanner;
 
 public class Main {
     public static void main(String[] args) {
-        System.out.println("Hello world!");
+        BillDivider divider = new BillDivider();
+        divider.createAndSplitBill();
     }
 }
diff --git a/src/main/java/PluralHelper.java b/src/main/java/PluralHelper.java
@@ -0,0 +1,23 @@
+public class PluralHelper {
+    private String one;
+    private String couple;
+    private String some;
+    public PluralHelper(String one, String couple, String some) {
+        this.one = one;
+        this.couple = couple;
+        this.some = some;
+    }
+    private String getStringFormattedPlurals(double count) {
+        int val = Math.abs((int)count) % 100;
+        int num = val % 10;
+        if (val > 10 && val < 20) return some;
+        if (num > 1 && num < 5) return couple;
+        if (num == 1) return one;
+        return some;
+    }
+
+    public String getFormattedPluralPattern(double count, String pattern) {
+        return String.format(pattern, count, getStringFormattedPlurals(count));
+    }
+
+}