# Import
import pandas

import math


# Functions go here
def make_statement(statement, decoration):
    """Emphasises headings by adding decoration at the start and end"""
    return f"{decoration * 3} {statement} {decoration * 3}"


def string_check(question, valid_answers=('yes', 'no'), num_letters=1):
    """Checks that users enter the full word or the 'n' letter/s of a word from a list of valid responses"""
    while True:
        response = input(question).lower()

        for item in valid_answers:
            # check if the response is the entire word
            if response == item:
                return item

            # check if it's the "n" letters
            elif response == item[:num_letters]:
                return item

        print(f"Please choose an option from {valid_answers}")


def instructions():
    print(make_statement("Instructions", "ℹ️"))

    print('''
    WELCOME TO TERRY'S TURKISH TEMPLE  

    Here’s how to place your order:  

    1. Enter your full name so we know who the order belongs to.  
    2. Provide a valid phone number so we can contact you if needed.  
    3. Browse the menu and choose the items you’d like to order.  
    4. Decide how you’d like to pay – Cash or Credit.  
    5. Choose whether you’d like Pickup or Delivery.  
    6. Check your order details carefully before confirming.  

    Enjoy your meal, and thank you for dining with us at Terry’s Turkish Temple! 😁
        ''')


def not_blank(question):
    """Checks that a user response is not blank"""

    while True:
        response = input(question)

        if response != "":
            return response

        print("Sorry this can't be blank. Please try again. \n")


def budget_check(question, min, max):
    """Checks users enter an integer"""

    error = f"Please enter a number between {min} and {max}"

    while True:

        try:

            response = int(input(question))

            if min <= response <= max:
                return response
            elif response > max:
                print("Sorry, too high a budget will cause too much stress on our employees")
                print(error)
            elif response < min:
                print("Sorry, you cant buy anything on our menu")
                print(error)
            else:
                print(error)

        except ValueError:
            print(error)


def int_check(question, min, max):
    """Checks users enter an integer"""

    error = f"Please enter a number between {min} and {max}"

    while True:

        try:

            response = int(input(question))

            if min <= response <= max:
                return response
            elif response > max:
                print(error)
            elif response < min:
                print(error)
            else:
                print(error)

        except ValueError:
            print(error)


def currency(x):
    """Formats numbers as currency ($#.##)"""
    return "${:.2f}".format(x)


def phone(question, min, max):
    error = f'Please enter a valid phone number between {min} and {max} numbers long'

    while True:

        try:

            response = input(question)

            if response.isdigit() and min <= len(response) <= max:
                return response
            elif len(response) > max:
                print("Sorry, That isn't a legal phone number")
                print(error)
            elif len(response) < min:
                print("Sorry, That isn't a legal phone number")
                print(error)
            else:
                print(error)

        except ValueError:
            print(error)


# initialise variables / non-default options for string checker
payment_ans = ('cash', "credit")
heading_string = make_statement("TERRY'S TURKISH TEMPLE", "=")
active_order = 1

# Credit card surcharge (currently 5%)
CREDIT_SURCHARGE = 0.05

while active_order == 1:

    main_food_list = [
        {"item": "Chicken Kebab", "price": 12, "stock": 25, "quantity": 0},
        {"item": "Lamb Kebab", "price": 12, "stock": 25, "quantity": 0},
        {"item": "Mixed Meat Kebab", "price": 16, "stock": 20, "quantity": 0},
        {"item": "Chicken on Chips", "price": 20, "stock": 15, "quantity": 0},
        {"item": "Lamb on Chips", "price": 20, "stock": 15, "quantity": 0},
        {"item": "Mixed Meat on Chips", "price": 25, "stock": 12, "quantity": 0},
        {"item": "Family Share Meal (Special)", "price": 50, "stock": 3, "quantity": 0},
    ]

    # print heading
    print(f"{heading_string}")

    # initialising lists, variabales...etc
    food_list = []
    cart = []
    running_price = 0

    # ask if they want to see the instructions
    want_instructions = string_check("Do you want to see the instructions?   ")
    # display if 'yes'
    if want_instructions == "yes":
        instructions()

    # get the users name
    name = not_blank("What is your name?")

    # get the users phone number
    phone_number = phone("What is your phone number?    ", 8, 11)

    # Ask for a Budget
    print("Let's establish a budget for you ")
    budget = budget_check("What is your budget (Minimum $12, Maximum $200)?\n", 12, 200)
    original_budget = budget
    print(
        f"Thank you for choosing your budget, we will make sure to only display items within your budget of ${budget}\n"
    )

    # create a loop function, so they can order food while their budget is higher than what the cheapest item is
    while budget > 11.99:
        max_number = 0
        # Creating list of food they can buy
        food_list = [item for item in main_food_list if item["price"] <= budget and item["stock"] > 0]

        # Displaying that list
        for i, item in enumerate(food_list, start=1):
            print(f"{i}. {item['item']} - ${item['price']} (Stock: {item['stock']})")
            max_number += 1
        print()

        # ask user for input on what food they would like
        want_food = int_check("Please select the number of which food you would like?", 0, max_number)

        # checks to see if they inputted 0 which means they don't want anything
        if want_food == 0:
            print("You have ended your current order")
            break

        # setting the max amount of that item they can buy
        selected_item = food_list[want_food - 1]
        max_amt = int(budget / selected_item['price'])
        max_amt = math.floor(max_amt)

        # sets the max they can buy to be whatever is lower: budget minimum or stock minimum
        if max_amt > selected_item["stock"]:
            max_amt = selected_item["stock"]
        print(f"You can buy up to {max_amt} of this item")

        # asks user how many of those items they would like if they can afford more than 1
        if max_amt > 1:
            selected_items = int_check(f"How many {selected_item['item']}'s would you like?", 0, int(max_amt))

            # else, they would only be able to buy one, hence well just add it to cart
        else:
            selected_items = 1
            print("You can only afford 1, so we’ll add that.")

        if selected_items >= 1:
            # Track Totals
            selected_item['quantity'] += selected_items
            print()

            # Add to cart
            cart.append({
                "item": selected_item['item'],
                "price": selected_item['price'],
                "quantity": selected_items
            })

            # update totals
            budget -= selected_item['price'] * selected_items
            running_price += selected_item['price'] * selected_items
            selected_item['stock'] -= selected_items

            # Print Feedback
            print(f"You selected {selected_items}: {selected_item['item']} price: ${selected_item['price']}")
            print()
            print(f"You have spent a total of: {currency(running_price)} so far")
            print(f"Your new budget is {currency(budget)}")
            print()

    # checks if budget is still equal to or higher than 12 and if it isn't, the current order ends and this message
    # displays
    if budget < 12:
        print("Whoops! It Looks like you don't have enough money to buy more food\n")
        print()

    # asks the user if they are happy with their cart and would like to continue to payment
    want_to_continue = string_check("Are you satisfied with your order and wish to continue to payment")
    print()
    if want_to_continue == 'yes':
        active_order = active_order - 1
    elif want_to_continue == 'no':
        continue

# receipt
receipt = pandas.DataFrame(cart)

# currency formatting
receipt["Total"] = receipt["price"] * receipt["quantity"]
for column in ["price", "Total"]:
    receipt[column] = receipt[column].apply(currency)

# Output receipt frame without index
receipt_string = receipt.to_string(index=False)

# strings and headings
order_details_heading = make_statement("Order Details", "-")

total_paid = sum(item['price'] * item['quantity'] for item in cart)
num_sold = sum(item['quantity'] for item in cart)
num_sold_string = f"Total items: {num_sold}"
name_string = f"Name: {name}"
phone_string = f"Phone: {phone_number}"

# ask user for payment method (cash / credit / ca / cr)
pay_method = string_check("Payment method: ", payment_ans, 2)

if pay_method == "cash":
    surcharge = 0

    # if paying by credit, calculate surcharge
else:
    surcharge = total_paid * CREDIT_SURCHARGE
    total_paid += total_paid * CREDIT_SURCHARGE

pay_method_string = f"Payment Method: {pay_method}"
total_paid_string = f"Grand Total: {currency(total_paid)}"
surcharge_string = f"Surcharge: {currency(surcharge)} (only applies to payment made with card"

# List of strings to be outputted / written to file
to_write = [heading_string,
            order_details_heading,
            name_string,
            phone_string,
            receipt_string, "\n",
            pay_method_string,
            surcharge_string,
            total_paid_string,
            num_sold_string, ]

for item in to_write:
    print(item)
# create file to hold data (add .txt extension)
file_name = "turkish_receipt"
write_to = "{}.txt".format(file_name)

text_file = open(write_to, "w+")

# write the item to file
for item in to_write:
    text_file.write(item)
    text_file.write("\n")