IsaevMilan · Nov 30, 2022 · Jan 10, 2023 · Jan 10, 2023 · faritowich · Jan 13, 2023
diff --git a/src/main/java/CalculationResult.java b/src/main/java/CalculationResult.java
@@ -0,0 +1,27 @@
+import java.util.List;
+
+public class CalculationResult {
+
+    private final List<String> goodList;
+    private final float pricePerPerson;
+    private final String currencySuffix;
+
+    public CalculationResult(List<String> goodList, float pricePerPerson, String currencySuffix) {
+        this.goodList = goodList;
+        this.pricePerPerson = pricePerPerson;
+        this.currencySuffix = currencySuffix;
+    }
+
+    public float getPricePerPerson() {
+        return pricePerPerson;
+    }
+
+    public List<String> getGoodList() {
+        return goodList;
+    }
+
+    public String getCurrencySuffix() {
+        return currencySuffix;
+    }
+}
+
diff --git a/src/main/java/Calculator.java b/src/main/java/Calculator.java
@@ -0,0 +1,70 @@
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.util.LinkedList;
+import java.util.List;
+
+public class Calculator {
+
+    private static final String TERMINATE_COMMAND = "завершить";
+    private static final char PRICE_DELIMITER = '.';
+    private static final char MIN_DIGIT = '0';
+    private static final char MAX_DIGIT = '9';
+
+    private final BufferedReader reader;
+    private final int peopleCount;
+    private final PricePlurals formatter;
+
+    public Calculator(BufferedReader reader, int peopleCount, PricePlurals formatter) {
+        this.reader = reader;
+        this.peopleCount = peopleCount;
+        this.formatter = formatter;
+    }
+
+    public CalculationResult calculate() throws IOException {
+        final List<String> goodList = new LinkedList<>();
+        float totalPrice = 0F;
+        while (true) {
+            System.out.println("Введите наименование товара");
+            final String good = reader.readLine();
+            float price = 0F;
+            while (price <= 0) {
+                System.out.println("Введите цену товара. Число должно быть положительным.");
+                final String potentialPrice = reader.readLine();
+                if (isNotValidPrice(potentialPrice)) {
+                    System.out.println("Цена введена неправильно. Разрешены только цифры и формате 0,00 или 0 ");
+                    continue;
+                }
+                price += Float.parseFloat(potentialPrice);
+            }
+            goodList.add(good);
+            totalPrice += price;
+            System.out.println("Товар успешно добален");
+            System.out.println("Напишите любой символ для добавления товара\n"  + "или слово \"Завершить\" если хотите перейти к расчетам  ");
+            final String command = reader.readLine();
+            if (TERMINATE_COMMAND.equalsIgnoreCase(command)) {
+                break;
+            }
+        }
+        System.out.println("Общая сумма составила "+ totalPrice +" руб.");
+        final float pricePerPerson = totalPrice / peopleCount;
+        final String currencySuffix = formatter.getSuffix(pricePerPerson);
+        return new CalculationResult(goodList, pricePerPerson, currencySuffix);
+    }
+
+    private boolean isNotValidPrice(String price) {
+        boolean dotIncluded = false;
+        final int length = price.length();
+        for (int i = 0; i < length; ++i) {
+            final char symbol = price.charAt(i);
+            if (symbol == PRICE_DELIMITER) {
+                if (dotIncluded) return true;
+                dotIncluded = true;
+                continue;
+            }
+            if (symbol < MIN_DIGIT || symbol > MAX_DIGIT) {
+                return true;
+            }
+        }
+        return false;
+    }
+}
diff --git a/src/main/java/Main.java b/src/main/java/Main.java
@@ -1,8 +1,30 @@
-public class Main {
+// dev branch for Y.Practicum
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
 
-    public static void main(String[] args) {
-        // ваш код начнется здесь
-        // вы не должны ограничиваться только классом Main и можете создавать свои классы по необходимости
-        System.out.println("Привет Мир");
+public class Main {
+    public static void main(String[] args) throws IOException {
+        try (final BufferedReader reader = new BufferedReader(new InputStreamReader(System.in))) {
+            int peopleCount = 0;
+            int MIN_USER_COUNT=2;
+            while (peopleCount < MIN_USER_COUNT) {
+                System.out.println("Введите количество людей");
+                peopleCount = Integer.parseInt(reader.readLine());
+                if (peopleCount < MIN_USER_COUNT) {
+                    System.out.println("Количество людей не может быть меньше " + MIN_USER_COUNT);
+                }
+            }
+            final PricePlurals formatter = new PricePlurals();
+            final Calculator calculator = new Calculator(reader, peopleCount, formatter);
+            final CalculationResult result = calculator.calculate();
+            System.out.println("Список товаров:");
+            for (final String good : result.getGoodList()) {
+                System.out.println(good);
+            }
+            final String formattedPrice = String.format("%.2f %s", result.getPricePerPerson(), result.getCurrencySuffix());
+            System.out.printf("Каждый участник должен заплатить %s%n", formattedPrice);
+        }
     }
 }
diff --git a/src/main/java/PricePlurals.java b/src/main/java/PricePlurals.java
@@ -0,0 +1,23 @@
+public class PricePlurals {
+
+    private static final int RADIX = 10;
+    private static final int REMAINDER_ONE = 1;
+    private static final int REMAINDER_TWO = 2;
+    private static final int REMAINDER_THREE = 3;
+    private static final int REMAINDER_FOUR = 4;
+    private static final int ELEVEN = 11;
+    private static final int TWELVE = 12;
+    private static final int THIRTEEN = 13;
+    private static final int FOURTEEN = 14;
+
+    public String getSuffix(float price) {
+        final int roundedPrice = (int) price;
+        final int lastDigit = roundedPrice % RADIX;
+        if (lastDigit == REMAINDER_ONE && roundedPrice != ELEVEN) return "рубль";
+        if (lastDigit == REMAINDER_TWO && roundedPrice != TWELVE) return "рубля";
+        if (lastDigit == REMAINDER_THREE && roundedPrice != THIRTEEN) return "рубля";
+        if (lastDigit == REMAINDER_FOUR && roundedPrice != FOURTEEN) return "рубля";
+        return "рублей";
+    }
+}
+