# Program:      Lesson 6 Assignment
# Programmer:   Andrew McKinley
# Date:         5/28/16
# Purpose:      The purpose of this program is to demonstrate the use of functions
#               To check for bad data and give a friendly error message.



# Define variables
import locale
locale.setlocale( locale.LC_ALL, '')

item_cnt = 0        # Amount of items
price = 3.5         # $3.50 for a box
total_qty = 0       # Total amount of boxes

cookie_list = []
cookie_list = "Savannah Thin-Mints Tag-a-Longs Peanut-Butter Sandwich".split()

order_list = []



# Banner
print("Welcome to your order for girl scout cookies!")
print()



# Function to calculate the total
def calc_tot(qty):
    return qty * 3.5



# Function to display the main menu
def disp_menu():
    choice_list = ["a", "d", "m", "q"]
    while True:
        print("What would you like to do?")
        print("a = add an item")
        print("d = delete an item")
        print("m = display the order")
        print("q = quit")
        choice = input("Make a choice > ")
        if choice in choice_list:
            return choice
        else:
            print("Invalid option. Please try again.")



# Function to display the items in the cookie list
def disp_items():
    print("Please choose a cookie flavor. Enter the item number.")
    for c in range(len(cookie_list)):
        print("{}.\t{}".format(c+1, cookie_list[c]))
    print()



# Function for the add process
def add_process():
    # Get and validate the user's input
    valid_data = False
    while not valid_data:
        disp_items()
        try:
            item = int(input("Enter an item number > "))
            if 1 <= item <= len(cookie_list):
                valid_data = True
            else:
                print("\nInvalid item number. Please try again.")

        except Exception as detail:
            print("error:", detail)

    # Validate the quantity input
    valid_data = False
    while not valid_data:
        try:
            qty = int(input("Enter the quantity > "))

            if 1 <= qty <= 10:
                valid_data = True
            else:
                print("\nThat was not a valid amount. Please try again.")
        except Exception as detail:
            print("Error:", detail)
            print("Please try again.")

    # Multiplication for the function
    item_total = locale.currency(calc_tot(qty), grouping=True)

    # Display the users choice
    print("\nYou chose: {} boxes of {} for a total of {}".format(qty,
                                                                 cookie_list[item-1],
                                                                 item_total))
    print()

    # Verify before including this item
    valid_data = False
    while not valid_data:
        incl = input("Would you like to include this in your order? (y/n) > ")
        print()
        if incl.lower() == "y":
            inx = item - 1
            detail_list = [inx, qty]
            order_list.append(detail_list)
            valid_data = True
            print("{} was added to your order.".format(cookie_list[inx]))
        elif incl.lower() == "n":
            print("{} was not added to your order.".format(cookie_list[inx]))
            valid_data = True
        else:
            print("Invalid response. Please try again.")



# Function used to delete an item from the list
def del_item():
    if len(order_list) == 0:
        print("You have no items in your order to delete.")
    else:
        print("\nChoose an item to delete")
        disp_order()
        valid_data = False
        while not valid_data:
            try:
                choice = int(input("Enter the item number you would like to delete > "))
                if 1 <= choice <= len(order_list):
                    choice = choice - 1
                    print("Item #{}. {} with {} boxes has been deleted.".format(choice + 1,
                                                                            order_list[choice][0],
                                                                            order_list[choice][1]))
                    del order_list[choice]
                    del order_list[choice]
                    valid_data = True
            except Exception as detail:
                print("Error:", detail)
                print("Please try again.")



# Function to display the order
def disp_order():
    order_total = 0.0
    print()
    print("Girl scout cookie order for NAME")
    print()
    print("Item #\tName\t\tQuantity\tPrice")
    for c in range (len(order_list)):
        item_total = calc_tot(order_list[c][1])
        fmt_item_total = locale.currency(item_total, grouping=True)
        order_total += item_total
        fmt_order_total = locale.currency(order_total, grouping=True)
        print("{}.\t\t{}\t\t\t{}\t\t\t{}".format(c + 1,
                                 order_list[c][0],
                                 order_list[c][1],
                                 fmt_item_total))
        print("-" * 20)
        print("Your order contains {} amount of items for a total of {}.".format(len(order_list),
                                                                                 fmt_order_total))

# Main Program
while True:
    choice = disp_menu()
    if choice == "a":
        add_process()
    elif choice == "d":
        del_item()
    elif choice == "q":
        break
    disp_order()