From 9b52b2f660839ee41699d16663b0a8ac4b913e32 Mon Sep 17 00:00:00 2001
From: VolkovaV <Volkova2007.>
Date: Thu, 29 Oct 2026 10:38:30 +0400
Subject: [PATCH] =?UTF-8?q?=D0=97=D0=B0=D0=B4=D0=B0=D0=BD=D0=B8=D0=B5=205:?=
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MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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---
 logic/__init__.py                             |   0
 logic/__pycache__/__init__.cpython-314.pyc    | Bin 0 -> 173 bytes
 .../product_calculator.cpython-314.pyc        | Bin 0 -> 2679 bytes
 logic/product_calculator.py                   |  44 ++++++++++++++++++
 tests/__init__.py                             |   0
 tests/__pycache__/__init__.cpython-314.pyc    | Bin 0 -> 173 bytes
 ...ct_calculator.cpython-314-pytest-9.1.1.pyc | Bin 0 -> 3796 bytes
 tests/test_product_calculator.py              |  31 ++++++++++++
 8 files changed, 75 insertions(+)
 create mode 100644 logic/__init__.py
 create mode 100644 logic/__pycache__/__init__.cpython-314.pyc
 create mode 100644 logic/__pycache__/product_calculator.cpython-314.pyc
 create mode 100644 logic/product_calculator.py
 create mode 100644 tests/__init__.py
 create mode 100644 tests/__pycache__/__init__.cpython-314.pyc
 create mode 100644 tests/__pycache__/test_product_calculator.cpython-314-pytest-9.1.1.pyc
 create mode 100644 tests/test_product_calculator.py

diff --git a/logic/__init__.py b/logic/__init__.py
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diff --git a/logic/product_calculator.py b/logic/product_calculator.py
new file mode 100644
index 0000000..0b244b2
--- /dev/null
+++ b/logic/product_calculator.py
@@ -0,0 +1,44 @@
+"""Расчет показателей товара для каталога."""
+
+from datetime import timedelta
+
+DISCOUNT_PERCENT = 25
+MANY_QUANTITY_THRESHOLD = 5
+
+
+def calculate_discounted_price(price, order_dates, calculation_date):
+    """Возвращает цену товара с учетом скидки.
+
+    Скидка 25% предоставляется, если в предыдущем календарном месяце
+    (относительно даты расчета) по товару не было заказов.
+
+    :param price: цена товара в рублях
+    :param order_dates: список дат заказов товара (datetime.date), может быть пустым
+    :param calculation_date: дата расчета (datetime.date)
+    :return: цена с учетом скидки, округленная до копеек
+    """
+    if price < 0:
+        raise ValueError("Цена не может быть отрицательной.")
+
+    current_month_start = calculation_date.replace(day=1)
+    previous_month_start = (current_month_start - timedelta(days=1)).replace(day=1)
+    has_orders_in_previous_month = any(
+        previous_month_start <= order_date < current_month_start
+        for order_date in order_dates
+    )
+
+    if has_orders_in_previous_month:
+        return price
+    return round(price * (100 - DISCOUNT_PERCENT) / 100, 2)
+
+
+def get_quantity_label(total_quantity):
+    """Возвращает «много», если пар больше пяти, иначе «мало».
+
+    :param total_quantity: количество пар суммарно по всем размерам
+    """
+    if total_quantity < 0:
+        raise ValueError("Количество не может быть отрицательным.")
+    if total_quantity > MANY_QUANTITY_THRESHOLD:
+        return "много"
+    return "мало"
diff --git a/tests/__init__.py b/tests/__init__.py
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diff --git a/tests/test_product_calculator.py b/tests/test_product_calculator.py
new file mode 100644
index 0000000..c861b58
--- /dev/null
+++ b/tests/test_product_calculator.py
@@ -0,0 +1,31 @@
+from datetime import date
+
+from logic.product_calculator import calculate_discounted_price, get_quantity_label
+
+def test_discounted_price_no_orders_in_previous_month_returns_price_with_discount():
+    price = 2000
+    order_dates = []
+    calculation_date = date(2027, 6, 15)
+
+    result = calculate_discounted_price(price, order_dates, calculation_date)
+
+    assert result == 1500
+
+def test_discounted_price_order_in_previous_month_returns_price_without_discount():
+    price = 2000
+    order_dates = [date(2027, 5, 10)]
+    calculation_date = date(2027, 6, 15)
+
+    result= calculate_discounted_price(price, order_dates, calculation_date)
+
+    assert result == 2000
+
+def test_quantity_label_five_pairs_returns_few():
+    result = get_quantity_label(5)
+
+    assert result == "мало"
+
+def test_quantity_label_six_pairs_return_many():
+    result = get_quantity_label(6)
+
+    assert result == "много"