#python imports
from typing import List
from dataclasses import dataclass, field

#dependency imports
from .cart_item import CartItem
from .product import Product

@dataclass
class Cart:
    items: List[CartItem]
    total_price: float = field(init=False, default=0.0)

    def add_item(self, product: Product, quantity: int):
        for item in self.items:
            if item.product.id == product.id:
                item.quantity += quantity
                return
        self.items.append(CartItem(product=product, quantity=quantity))

    def remove_item(self, product_id: str):
        self.items = [item for item in self.items if item.product.id != product_id]

    def calculate_total_price(self) -> float:
        self.total_price = sum(item.calculate_total_price() for item in self.items)

    def list_items(self) -> List[str]:
        return [f"{item.quantity} x {item.product.name} - {item.calculate_total_price()} EUR" for item in self.items]