# Final Project- Adrian Camano & Ryan Donaldson

# Import the UUID module to help us with generating a
# unique transaction ID
import uuid

# Generates a transaction ID
def generate_transaction_id():
    # Casts uuid object to a 128-bit hexadecimal string
    fullUuid = uuid.uuid4().hex
    # Only take the first section of the UUID to make it look more
    # like a real transaction ID
    transactionId = fullUuid[0:7]
    # Returns the transaction ID as an upper case string
    return transactionId.upper()

# Function that formats either of our inventories to print pretty
def print_inventory(storage):
    # If our dictionary is not empty, then format
    if bool(storage):
        # Iterate through our inventory to get the ID, title, and price of the item
        for partId, inventory in storage.iteritems():
            for title, price in inventory.iteritems():
                print "%s. %s - $%d" % (partId, title, price)
    else:
        # Print if our dictionary is empty
        print "There is nothing in our inventory or nothing in your shopping cart right now!"

# Function that ends our program
def end():
    print "Thank you for shopping with us!"
    pass

# Stores all of our computer store parts, ID as key, another dictionary as a value
# with title and price of the item
parts = {
    1: {"Logitech Keyboard": 100},
    2: {"Logitech VX Nano Wireless Mouse": 280},
    3: {"LG LCD LED Monitor": 650},
    4: {"Asus SABERTOOTH Z97 Motherboard": 200},
    5: {"Intel Core i7-5930K CPU": 580},
    6: {"SAPPHIRE NITRO Radeon R9 390 Graphics Card": 340},
    7: {"HIS Radeon R9 390 DirectX 12 System Fans": 320},
    8: {"Thermaltake Core V71 Computer Case": 120},
    9: {"Seagate Desktop HDD.15 Hard Drive": 130},
    10: {"Microsoft Windows 10 Home-64bit-OEM": 100}
}

# Stores all of the items in our shopping cart
shopping_cart = {

}

print "Welcome!"
print "\nPlease enter your username and password to begin."

# Stores our list of users
allowed_users = ['ADMIN']
# Stores our list of passwords for each user
passwords = ['admin']

# Asks for a username to login with
username = raw_input("Username: ")
# Asks for a password to login with
password = raw_input("Password: ")

# Controls if the user belongs to allowed_users, checks if a username or password
# can be found in each of their respective arrays
if username in allowed_users and password.lower() or password.upper() in passwords:
    print "\nWelcome, Admin!"
else:
    # End the program if they entered a wrong username or password
    print "\nAccess denied, please try again later!"
    exit()

# Stores the user's current balance
money = 1000.00

# Print amount of money in their balance when they login
print "Thanks for logging in! You have currently $%s in your account." % money

# Loops main menu until break
while True:
    # Print menu selection
    selection = raw_input("""What would you like to do?:
    \t1) Browse Inventory
    \t2) View Shopping Cart
    \t3) Leave
    """)

    if selection == "1":
        # If user chooses to browse inventory, print the inventory and ask if they
        # would like to purchase an item
        while True:
            print "Here is our current inventory:"
            print_inventory(parts)
            selection = int(raw_input("\nWhat would you like to purchase?: "))
            # If the ID of the user input can be found in the array, add it to
            # shopping cart
            if selection in parts:
                # Gets the value based on the ID in the inventory
                inv = parts[selection]
                # Since there's 1 key & value for each value of our inventory
                # it's safe to access the 0th element and assign to a
                # variable for title & price
                title = inv.keys()[0]
                price = inv.values()[0]
                # Add a new element to our dictionary
                shopping_cart[title] = price

                # Tell the user they have added the item to their shopping cart
                print "You have added %s - $%d to your shopping cart." % (title, price)

                continuee = raw_input("\nWould you like to continue shopping?: ")
                # If user wants to continue shopping, repeat this inner while
                # loop. Else, start over and print the main menu again
                if continuee == "Yes":
                    continue
                else:
                    break
    # If the user wants to view their shopping cart, format the dictionary
    # to be a readable by the user, add each price value to their total
    # price and then ask if they would like to checkout
    elif selection == "2":
        # Stores total price for all items
        total_price = 0

        # If the user has items in their shopping cart, continue
        if bool(shopping_cart):
            # Formats our dictionary to tell the user what's in their shopping cart
            print "Here is what's currently in your shopping cart:"
            i = 0
            for title, price in shopping_cart.iteritems():
                i = i + 1
                print "%s. %s - $%d" % (i, title, price)

            # Adds each price to their total price
            for price in shopping_cart.values():
                total_price += price

            checkout = raw_input("\nWould you like to checkout?: ")
            if checkout == "Yes":
                # If they choose to checkout, generate a transaction ID
                # and add sales tax & S+H to their cost
                transaction_id = generate_transaction_id()
                sales_tax = total_price * 0.07
                with_shipping_handling = total_price + sales_tax + 9.95
                # Print total cost & transaction
                print "\nTotal Cost: $%d" % (total_price)
                print "Total Cost w/ Sales Tax: $%d" % (total_price + sales_tax)
                print "Total Cost w/ Sales Tax & Shipping and Handling: $%d" % (with_shipping_handling)
                print "Transaction ID: %s" % (transaction_id)

                # If they do not have money to purchase all the items, end the
                # program
                if money < with_shipping_handling:
                    print "You do not have enough money to purchase all these items!"
                    break
                else:
                    # Clears all items from the shopping cart
                    shopping_cart.clear()
                    # Subtract total_price from their money
                    money -= with_shipping_handling
                    # Print their new balance
                    print "Your balance is now: $%d" % (money)

                    # If they would like to continue shopping, print the main menu
                    # again or else end the program
                    continue_shopping = raw_input("\nWould you like to continue shopping?: ")
                    if continue_shopping == "Yes":
                        continue
                    else:
                        end()
                        break
        # If the user has no items in their shopping cart, go back to the main menu
        else:
            print "You do not have any items in your shopping cart right now!"
            continue
    # End the program if a user wants to leave
    elif selection == "3":
        end()
        break
    # Prints the main menu again if an invalid command was entered
    else:
        print "Invalid command, please try again."
        continue