from collections import defaultdict
import math
from services.DealsService import DealsService
from services.ProductService import ProductService


class BasketService:
    baskets = None
    dealsService = None
    productService = None

    def __init__(self) -> None:
        self.baskets = defaultdict()
        self.dealsService = DealsService()
        self.productService = ProductService()

    def total(self, sessionID: str) -> int:
        # this function should really be in a separate file but I am already over time
        # this round up function needs to be checked with stakeholders 
        # as it would generate millions in profit in a big online shop, 
        # but could be considered unfriendly towards consumers 
        def _round_up(val: float):
            return math.ceil(val * 100) / 100
        items = self.baskets[sessionID]
        prices = self.dealsService.get_items_with_final_prices(items)
        return _round_up(sum([item.price for item in prices]))

    def scan(self, session_id: str, itemId) -> None:
        item = self.productService.get_item_from_id(itemId)
        if session_id not in self.baskets:
            self.baskets[session_id] = []    
        self.baskets[session_id].append(item)