# Check that users have entered a valid option based on a list
def string_checker(question, valid_ans):

    error = f"Please enter a valid option from the following list: {valid_ans}"

    while True:

        user_response = input(question).lower()

        for var_item in valid_ans:

            # Full word check
            if user_response == var_item:
                return var_item

            # Shortcut check
            words = var_item.replace("&", "").split()
            shortcut = ""

            for word in words:
                shortcut += word[0]

            if user_response == shortcut:
                return var_item

        print(error)
        print()


# Displays instructions
def instruction():
    print('''

📃📃📃Instructions📃📃📃

Enter your delivery address if you pick delivery.
You can type shortcuts for everything or type the whole word.

Examples:
d = delivery
p = pepperoni
hc = ham & cheese
bc = buffalo chicken
gp = garlic prawn
ms = mario special

Type x in the ordering section to finish your order and continue to the cart.
Type back in the cart to continue ordering. 
Each pizza will add two minutes to the total delivery time + 10 minutes
Each pizza will add two minutes to the pickup time
''')


# Integer checker
def int_check(question, low, high):

    error = f"Oops - please enter an integer between {low} and {high}."

    while True:

        try:
            response = int(input(question))

            if low <= response <= high:
                return response

            else:
                print(error)

        except ValueError:
            print(error)


# Menu display
def menu():
    print('''
📜📜📜MENU📜📜📜

1. Pepperoni (p)
2. Cheese (c)
3. Ham & Cheese (hc)
4. Vegetarian (v)
5. Cheesy Garlic (cg)
6. Buffalo Chicken (bc)
7. Onion (o)
8. Meatlovers (m)
9. Hawaiian (h)
10. Garlic Prawn (gp)
11. Mario Special (ms)

Type x to finish order and continue to cart.
''')


# Variables
yes_no = ["yes", "no"]
delivery_options = ["delivery", "pickup"]

menu_items = [
    "pepperoni",
    "cheese",
    "ham & cheese",
    "vegetarian",
    "cheesy garlic",
    "buffalo chicken",
    "onion",
    "meatlovers",
    "hawaiian",
    "garlic prawn",
    "mario special",
    "x"
]

cart = []

# Heading
print("🍕🍕Mario's Pizza🍕🍕")
print("Welcome to Mario's Pizza")
print()

# Instructions
want_instructions = string_checker(
    "Do you want to read the instructions? ",
    yes_no
)

if want_instructions == "yes":
    instruction()

# Delivery or pickup
order_type = string_checker(
    "Do you want delivery or pickup? ",
    delivery_options
)

if order_type == "delivery":
    address = input("Please enter your address: ")

else:
    print("Ok, your pickup time will be decided at the end")
    print()

# Show menu
ask_menu = string_checker(
    "Would you like to see the menu? ",
    yes_no
)

if ask_menu == "yes":
    menu()

# Ordering loop
while True:

    ask_order = string_checker(
        "What pizzas would you like? ",
        menu_items
    )

    if ask_order == "x":
        print("\nOrder finished.")
        break

    ask_amount = int_check(
        "How many would you like? ",
        1,
        99
    )

    cart.append([ask_order, ask_amount])

    print(f"{ask_amount} {ask_order} added to your cart")
    print()

# Cart / confirmation loop
while True:

    print("\n🛒🛒🛒 YOUR CART 🛒🛒🛒")

    if len(cart) == 0:
        print("Your cart is empty.")

    total_pizzas = 0

    for item in cart:
        pizza = item[0]
        quantity = item[1]
        total_pizzas += quantity
        print(f"{quantity} x {pizza}")

    # Time calculations
    pickup_time = (total_pizzas * 2)

    if order_type == "delivery":
        delivery_time = pickup_time + 10
        print(f"\n🚚 Estimated delivery time: {delivery_time} minutes")
    else:
        print(f"\n🍕 Estimated pickup time: {pickup_time} minutes")

    cart_choice = input(
        "\nType 'back' to continue ordering or press Enter to confirm order: "
    ).lower()

    if cart_choice == "back":

        while True:

            ask_order = string_checker(
                "What pizzas would you like? ",
                menu_items
            )

            if ask_order == "x":
                break

            ask_amount = int_check(
                "How many would you like? ",
                1,
                99
            )

            cart.append([ask_order, ask_amount])

            print(f"{ask_amount} {ask_order} added to your cart")
            print()

    else:
        print("\n✅ Order confirmed!")

        if order_type == "delivery":
            print(f"Your order will be delivered in approximately {delivery_time} minutes.")
        else:
            print(f"Your order will be ready for pickup in approximately {pickup_time} minutes.")

        break