from datetime import datetime # For print_receipt

# Display all items in cart with prices and total
def display_cart(cart):
    i = 1
    for item in cart:
        print(f"{i}. {item} - ${cart[item]:.2f}")
        i += 1

# Add item to cart or update if exists
def add_to_cart(cart, item, price):
    cart[item] = price
    return cart

# Remove item by position number
def remove_from_cart(cart, item_number):
    i = 1
    for item in cart:
        if i == item_number:
            cart.pop(item)
            return cart
    print("WARNING: No item with number {i} found!")
    return cart


# Calculate total price of all items
def calculate_total(cart):
    total = 0
    for item in cart:
        total += cart[item]
    return total

# Helper function for nicely printing lines in receipt
def print_fill(left_side, right_side, filler, line_len):
    middle = ""
    while len(f"{left_side}{middle}{right_side}") < line_len:
        middle += filler
    print(f"{left_side}{middle}{right_side}")


def print_receipt(cart):
    print("========== RECEIPT =======")
    print(f"Date: {datetime.now().date().isoformat()}")
    print("")
    for item in cart:
        print_fill(item, f" ${cart[item]:.2f}", ".", 26)
    print("")
    subtotal = calculate_total(cart)
    tax = 0.08 * subtotal
    print_fill("Subtotal:", f" ${subtotal}", " ", 26)
    print_fill("Tax (8%):", f" ${tax:.2f}", " ", 26)
    print("--------------------------")
    total = subtotal + tax
    print_fill("Total:", f" ${total:.2f}", " ", 26)
    print("==========================")


# # Main program
cart = {}  # Empty dictionary to store items and prices
while True:
    print("Menu:")
    print("1. Display Cart")
    print("2. Add to Cart")
    print("3. Remove from Cart")
    print("4. Get Total")
    print("5. Checkout")
    choice = input("Enter choice: ")
    if choice == "1":
        display_cart(cart)
    elif choice == "2":
        item = input("Item: ")
        price = float(input("Price: "))
        cart = add_to_cart(cart, item, price)
    elif choice == "3":
        item_number = int(input("Item Number: "))
        cart = remove_from_cart(cart, item_number)
    elif choice == "4":
        total = calculate_total(cart)
        print(f"Total: {total:.2f}")
    elif choice == "5":
        print_receipt(cart)
        break
    else:
        print(f"Invalid option: {choice}")