from typing import final

from PySide6.QtWidgets import QWidget, QVBoxLayout, QLabel
from Movie import Movie
from enum import Enum

class ShopItemType(Enum):
    """
    Enum dictating types of items that can be bought from the cinema.
    """
    Movie = 0
    Popcorn = 1
    Frozen_Coke = 2

@final
class ShopItem:
    """
    Represents an item that can be bought from the cinema.
    """
    def __init__(self, shoptype: ShopItemType, quantity: int, movie: Movie | None = None):
        """
        Creates a new ShopItem.
        Throws:
            ValueError - type is ShopItemType.Movie, but movie is not provided as a paramater
        Example (creates a ShopItem with type popcorn and quantity 3):
            ShopItem(ShopItemType.Popcorn, 3)
        """
        self.type = shoptype
        self.movie = movie
        self.quantity = quantity
        self.cost: float
        match shoptype:
            case ShopItemType.Movie:
                if movie is not None:
                    self.cost = movie.price
                else:
                    raise ValueError("ShopItem with type ShopItemType.Movie must provide a movie as an argument")
            case ShopItemType.Popcorn:
                self.cost = 9.95
                pass
            case ShopItemType.Frozen_Coke:
                self.cost = 4.95

    def __repr__(self):
        return f"ShopItem(type={self.type}, movie={self.movie}, quantity={self.quantity}, cost={self.cost})"

@final
class Cart:

    cv: CartView | None = None

    def __init__(self):
        self.contents: list[ShopItem] = []

    def __repr__(self):
        return f"Cart(contents={self.contents})"

    def addItem(self, item: ShopItem):
        self.contents.append(item)
        pass

    def show(self):
        self.cv = CartView()
        self.cv.show()


cart = Cart()

class CartView(QWidget):
    def __init__(self):
        super().__init__()
        global cart
        self.setWindowTitle("Work in progress!")
        layout = QVBoxLayout()
        layout.addWidget(QLabel(f"Cart: {cart}"))
        self.setLayout(layout)