db = dict()
#Empty list that acts as a database

state = False
#State defined to start and stop while loop which acts as our on off switch for the database

def get_user():
    user1 = input("What is your username?\n")
    user = user1
    return user

def get_pass():
    password = input("What is your password?\n")
    return password
def login():
    #This is going to be called when user says he is logging in.
    #user and pass variables used to check in db for existing usernames
    user = get_user()
    password = get_pass()

    #if checks through every object in database to see if user and pass are in db
    if user in db and password == db[user][0]:
        print("Hello ", user,"\n")
        loginchoice(user)
        return user

    #Else catches if username and pass fail and call back decision function
    else:
        print("Error: Username or Password incorrect.\n")
        userinput()

def signup():
    #This is called when user chooses signing up
    #user and pass variables used to check in db for existing usernames
    user = input("What is your username?\n")
    password = input("What is your password?\n")

    #Boolean tree used if signup username is original and adds the input into database
    if user not in db:
        db[user] = [password, 0]
        print("Sign up complete. Please attempt to login. \n")
        userinput()
    #If boolean check fails it means there is identical username in database and it cannot add it
    else:
        print("This username already exists, please try again.\n")
        userinput()

def test():
    #This function prints out the db to make sure we are adding users and passwords to database
    print(db)
    userinput()

def userinput():
    #State activates while loop and "turns on" our database
    state = True

    #This function asks the user on whether they want to login or signup
    #Because it is setup this way it gives the user the ability to choose from several options.
    question = input("Press G to login, Press S to signup, Press T for test, or press Q to quit.\n")

    if question.lower() == 'g':
        login()
    elif question.lower() == 's':
        signup()
    elif question.lower() == 't':
        test()
    elif question.lower() == 'q':
        state = False
        print("Thanks for your time! Login soon.\n")
    else:
        print("ERROR: Invalid input\n")
        userinput()

def check_balance(user):
    print("Your balance is:", db[user][1])
    loginchoice(user)

def deposit(user):
    print(user)
    deposit = input("How much would you like to deposit?\n")
    db[user][1] += int(deposit)
    print("Your new balance is now:", db[user][1])
    loginchoice(user)

def withdraw(user):
    withdraw = input("How much would you like to withdraw?\n")
    db[user][1] -= int(withdraw)
    print("Your new balance is now:", db[user][1])
    loginchoice(user)

def loginchoice(user):
    #This function is called when login is successful.
    #It gives a further decision tree for logged in users.
    choice = input("What would you like to do?\n1.) Check balance. \n2.) Deposit money \n3.) Withdraw money \n4.) Back to menu. \n")
    if int(choice) == 1:
        check_balance(user)
    elif int(choice) == 2:
        deposit(user)
    elif int(choice) == 3:
        withdraw(user)
    elif int(choice) == 4:
        userinput()
    else:
        print("ERROR: Invalid input\n")
        loginchoice(user)


def game_start():
    userinput()

    while state == True:
        #While loop initiates database start and calls functions when needed.
        user = get_user()


game_start()