import math #this allows functions using maths to be used later on within the program
def end(credit):#defines the program
    print("dispense change:",credit,"p")
    print("Goodbye")
def choices(credit):#defines the program
    print("")#spacing for better structure
    print('you can choose from the products below')#tells user that they can choose from a list of products
    print("1.Water-50p")#choice 1 out of 5. 5 other choices are mentioned below. Also tells the user how much the products cost
    print("2.Yoghurt-100p")
    print("3.Chocolate-120p")
    print("4.Coke-160p")
    print("5.crisps-70p")
    print("You have",credit,"p")#tells the user how much credit they currently have
    choice=int(input("would you like product 1,2,3,4,5"))#this is where the choice is made for the user to buy a product
    water=50
    yoghurt=70
    wasabi=100
    chocolate=120
    coke=160
    crisps=70
    if choice=1:#if statement:if choice is 1 then it will lead to (mentioned below)
        print("you have picked a water that is 50p")#lets the user know they have picked the item corresponding with the number the inputted
        pricecheck=credit-water#variable 'pricecheck' takes away the item value from the credit
        if pricecheck<0:#if the 'pricecheck' is lower than 0, it shows that the user does not have enough
            print("you don't have enough money")#on the basis of the price check, it will tell the user they do not have enough money

        else:#if the credit is something else it shows that it is not below 0, thus meaning that it had to have been the case that the user had enough money on their balance
            credit=credit-water#variable 'credit' takes away water from credit
            print("")
            print("Dispense water")#dispenses water on the basis of the aforementioned else statement
            print("you have",credit,"p left")#tells you how much credit you have left

    elif choice==2:
        print("you have picked a yoghurt worth 100p")# **same process as previous item.
        pricecheck=credit-yoghurt
        if pricecheck<0:
            print("you don't have enough money")

        else:
            credit=credit-yoghurt
            print("")
            print("Dispense yoghurt")
            print("you have",credit,"p left")

    elif choice==3:
        print("you have picked a chocolate worth 120p")
        pricecheck=credit-chocolate
        if pricecheck<0:
            print("you don't have enough money")

        else:
            credit=credit-chocolate
            print("")
            print("Dispense chocolate")
            print("you have",credit,"p left")

    elif choice==4:
        print("you have picked a Coke worth 160p")
        pricecheck=credit-coke
        if pricecheck<0:
            print("you don't have enough money")

        else:
            credit=credit-coke
            print("")
            print("Dispense Coke")
            print("you have",credit,"p left")

    elif choice==5:
        print("you have picked crisps worth 70")
        pricecheck=credit-crisps
        if pricecheck<0:
            print("you don't have enough money")

        else:
            credit=credit-crisps
            print("")
            print("Dispense crisps")
            print("you have",credit,"p left")# **same process of tasks ends here


    newcredit=int(input("To input more credit enter 1, to buy another item enter 2, to dipense your goods and collect your change enter 3:"))#variable 'newcredit' gives the user 3 options on what  they would like to do.

    if newcredit==1:#if the choice of 'newcredit' is 1...
        balancee(credit)#lets the user input more credit

    elif newcredit == 2:#if the choice of 'newcredit' is 2...
        choices(credit)#loops back to choices as user wants to buy another item

    elif newcredit == 3:#if the choice of 'newcredit' is 3...
        end(credit)#ends the program



def balancee(credit):#defines the mentioned 'creditz'
    response=int(1)# response is integer 1
    while response==1:#while loop which is continuous. whenever user inputs 1 the following will occur...
        coins=int(input("Enter a single coin:10p=10 20p=20 50p=50 £1=100:"))#you can make your choice on the basis of the 'response' variable. 'coins' represents the new credit entered each time.
        credit=credit+coins#adds on the new credit you inputted
        print("your current credit is:",credit,"p")#prints your new credit. will always update it.
        response=int(input("If you would like to put in more coins- enter 1 for yes and 2 for no"))#lets the user make another choice. if choice is 1, it will loop back to the while loop, ultimately leading back to this choice again. this allows the user to buy as many items as possible

    choices(credit)




def vending_machine():
    print("welcome to the vending machine!!!")
    print("currently you have no credit.")
    credit=int(0)
    balancee(credit)

vending_machine()