# Практическая работа
# Тема: Обработка данных интернет-магазина


def load_products_from_file(filepath):
    products = []

    try:
        file = open(filepath, "r", encoding="utf-8")

        for line in file:
            line = line.strip()

            if line == "":
                continue

            parts = line.split(";")

            if len(parts) != 6:
                continue

            try:
                product = {
                    "id": int(parts[0]),
                    "name": parts[1],
                    "category": parts[2],
                    "price": float(parts[3]),
                    "quantity": int(parts[4]),
                    "description": parts[5]
                }
                products.append(product)
            except:
                continue

        file.close()

    except FileNotFoundError:
        print("Файл не найден")
    except:
        print("Ошибка при чтении файла")

    return products


def validate_product(product):
    if "id" not in product:
        return False
    if "name" not in product:
        return False
    if "category" not in product:
        return False
    if "price" not in product:
        return False
    if "quantity" not in product:
        return False
    if "description" not in product:
        return False

    if product["name"].strip() == "":
        return False
    if product["category"].strip() == "":
        return False
    if product["price"] < 0:
        return False
    if product["quantity"] < 0:
        return False

    return True


def filter_products_by_category(products, category):
    result = []

    for product in products:
        if product["category"].lower() == category.lower():
            result.append(product)

    return result


def search_products_by_keyword(products, keyword):
    result = []

    for product in products:
        text = product["name"] + " " + product["description"]

        if keyword.lower() in text.lower():
            result.append(product)

    return result


def sort_products_by_price(products, descending=False):
    return sorted(products, key=lambda x: x["price"], reverse=descending)


def calculate_discounted_price(price, discount_percent):
    new_price = price - price * discount_percent / 100
    return round(new_price, 2)


def build_cart(products, product_ids):
    cart = []

    for product_id in product_ids:
        for product in products:
            if product["id"] == product_id:
                cart.append(product)
                break

    return cart


def calculate_cart_total(cart, discounts=None):
    total = 0

    for product in cart:
        current_price = product["price"]

        if discounts is not None:
            if product["id"] in discounts:
                current_price = calculate_discounted_price(current_price, discounts[product["id"]])
            elif product["category"] in discounts:
                current_price = calculate_discounted_price(current_price, discounts[product["category"]])

        total += current_price

    return round(total, 2)


def group_products_by_category(products):
    groups = {}

    for product in products:
        category = product["category"]

        if category not in groups:
            groups[category] = []

        groups[category].append(product)

    return groups


def generate_order_report(cart, total_cost):
    report = "Отчет по заказу\n"
    report += "-------------------------\n"

    number = 1
    for product in cart:
        report += str(number) + ". " + product["name"] + " - " + str(product["price"]) + " руб.\n"
        number += 1

    report += "-------------------------\n"
    report += "Количество товаров: " + str(len(cart)) + "\n"
    report += "Итоговая стоимость: " + str(total_cost) + " руб.\n"

    return report


def main():
    products = load_products_from_file("data.txt")

    print("Загруженные товары:")
    for product in products:
        print(product)

    valid_products = []
    invalid_products = []

    for product in products:
        if validate_product(product):
            valid_products.append(product)
        else:
            invalid_products.append(product)

    print()
    print("Корректных товаров:", len(valid_products))
    print("Некорректных товаров:", len(invalid_products))

    filtered_products = filter_products_by_category(valid_products, "Электроника")
    print()
    print("Товары категории Электроника:")
    for product in filtered_products:
        print(product["name"], "-", product["price"], "руб.")

    found_products = search_products_by_keyword(valid_products, "игровой")
    print()
    print("Поиск по слову 'игровой':")
    for product in found_products:
        print(product["name"], "-", product["description"])

    sorted_products = sort_products_by_price(found_products)
    print()
    print("После сортировки по цене:")
    for product in sorted_products:
        print(product["name"], "-", product["price"], "руб.")

    if len(valid_products) > 0:
        old_price = valid_products[0]["price"]
        new_price = calculate_discounted_price(old_price, 10)

        print()
        print("Пример расчета скидки:")
        print("Старая цена:", old_price)
        print("Новая цена:", new_price)

    cart = build_cart(valid_products, [1, 3, 5])
    print()
    print("Корзина:")
    for product in cart:
        print(product["name"], "-", product["price"], "руб.")

    discounts = {
        1: 10,
        "Электроника": 5
    }

    total_cost = calculate_cart_total(cart, discounts)
    print()
    print("Итоговая стоимость корзины:", total_cost, "руб.")

    groups = group_products_by_category(valid_products)
    print()
    print("Группировка товаров по категориям:")
    for category in groups:
        print(category, "-", len(groups[category]), "товаров")

    report = generate_order_report(cart, total_cost)
    print()
    print(report)


if __name__ == "__main__":
    main()