Solution

app/customer.py

@@ -0,0 +1,53 @@
+import math
+from app.shop import Shop
+
+
+class Customer:
+    def __init__(
+            self,
+            name: str,
+            product_cart: dict,
+            location: list[int],
+            money: int,
+            car: dict
+    ) -> None:
+        self.name = name
+        self.product_cart = product_cart
+        self.location = location
+        self.money = money
+        self.car = car
+
+    def customer_has_money(self) -> None:
+        print(f"{self.name} has {self.money} dollars")
+
+    def cost_of_the_trip(
+            self,
+            fuel_prize: float,
+            customer_location: list[int],
+            shop_location: list[int]) -> float:
+        distance = math.sqrt(
+            (shop_location[0] - customer_location[0]) ** 2
+            + (shop_location[1] - customer_location[1]) ** 2)
+        return round(self.car["fuel_consumption"]
+                     * distance / 100 * fuel_prize, 2)
+
+    def does_not_have_enough_money(self) -> None:
+        print(f"{self.name} doesn't have enough "
+              f"money to make a purchase in any shop")
+
+    def customer_ride_to_shop(self, shop_obj: Shop) -> None:
+        print(f"{self.name} rides to {shop_obj.name}")
+
+    def bought_milk(self, product_milk: float) -> None:
+        print(
+            f'{self.product_cart["milk"]} milks '
+            f'for {self.product_cart["milk"] * product_milk} dollars')
+
+    def bought_bread(self, product_bread: float) -> None:
+        print(
+            f'{self.product_cart["bread"]} bread '
+            f'for {self.product_cart["bread"] * product_bread} dollars')
+
+    def bought_butter(self, product_butter: float) -> None:
+        print(f'{self.product_cart["butter"]} butter '
+              f'for {self.product_cart["butter"] * product_butter} dollars')

app/main.py

@@ -1,3 +1,70 @@
-def shop_trip():
-    # write your code here
-    pass
+import os
+from datetime import datetime
+import json
+
+from app.shop import Shop
+from app.customer import Customer
+
+
+def shop_trip() -> None:
+    config_path = os.path.join(os.path.dirname(__file__), "config.json")
+    with open(config_path) as config:
+        config_data = json.load(config)
+    fuel_prize = config_data["FUEL_PRICE"]
+
+    list_customers = [Customer(customers["name"],
+                               customers["product_cart"],
+                               customers["location"],
+                               customers["money"],
+                               customers["car"]
+                               ) for customers in config_data["customers"]]
+
+    list_shops = [Shop(
+        shops["name"],
+        shops["location"],
+        shops["products"])
+        for shops in config_data["shops"]]
+
+    for customer in list_customers:
+        customer.customer_has_money()
+        costs = float("inf")
+        shop_obj = None
+        for shop in list_shops:
+            min_cost = (customer.cost_of_the_trip(
+                fuel_prize,
+                customer.location,
+                shop.location) * 2 + shop.price_products(
+                    customer.product_cart["milk"],
+                    customer.product_cart["bread"],
+                    customer.product_cart["butter"]
+            ))
+            if min_cost < costs:
+                costs = min_cost
+                shop_obj = shop
+            print(f"{customer.name}'s trip to "
+                  f"the {shop.name} costs {min_cost}")
+        if customer.money < costs:
+            customer.does_not_have_enough_money()
+
+        else:
+            customer.customer_ride_to_shop(shop_obj)
+            now = datetime.now()
+            print()
+            print(now.strftime("Date: %d/%m/%Y %H:%M:%S"))
+            print(f"Thanks, {customer.name}, for your purchase!")
+            print("You have bought:")
+            customer.bought_milk(shop_obj.products["milk"])
+            customer.bought_bread(shop_obj.products["bread"])
+            customer.bought_butter(shop_obj.products["butter"])
+            total_cost = (customer.product_cart["milk"]
+                          * shop_obj.products["milk"]
+                          + customer.product_cart["bread"]
+                          * shop_obj.products["bread"]
+                          + customer.product_cart["butter"]
+                          * shop_obj.products["butter"])
+            print(f"Total cost is {total_cost} dollars")
+            print("See you again!")
+            print()
+            print(f"{customer.name} rides home")
+            print(f"{customer.name} now has {customer.money - costs} dollars")
+            print()

app/shop.py

@@ -0,0 +1,15 @@
+class Shop:
+    def __init__(self, name: str, location: list[int], products: dict) -> None:
+        self.name = name
+        self.location = location
+        self.products = products
+
+    def price_products(
+            self,
+            quantity_milk: int,
+            quantity_bread: int,
+            quantity_butter: int
+    ) -> float:
+        return (self.products["milk"] * quantity_milk
+                + self.products["bread"] * quantity_bread
+                + self.products["butter"] * quantity_butter)

tests/test_main.py

@@ -6,7 +6,6 @@
 
 from app.main import shop_trip
 
-
 def test_shop_trip_output(monkeypatch):
     datetime_mock = MagicMock(wrap=datetime.datetime)
     datetime_mock.now.return_value = datetime.datetime(2021, 1, 4, 12, 33, 41)