import random

balance =  "%.2f" % round(random.uniform(1,1000),2)


save = 0
attempt = 1
database = []
def getPassword(x):
    loop = 1
    while loop == 1:
        global attempt
        while attempt == 1:
            password = input("Enter Password: ")
            while len(password) > 8 or len(password) < 6:
                    password = input("Error. Password must be 6-8 characters. Try again: ")
            else:
                attempt = attempt + 1
        while attempt == 2:
            secondPassword = input("Re-Enter Password: ")
            if secondPassword == password:
                print("Registration sucessful.")
                attempt = 1
                return password
            else:
                print("Error. Passwords do not match.")
                attempt = 1

def changePassword():
  global save
  global database
  looping = 1
  success = 0
  oldpword = input("\nPlease enter your old password: ")
  while looping == 1:
    if oldpword == database[save][1]:
      newpword = input("Please enter your new password: ")
      redopword = input("Please enter your password again: ")
      while newpword != redopword:
        redopword = input("Passwords do not match. Try again:")
      database[save][1] = redopword
      success = 1
      break
      looping -= 1
    while oldpword != database[save][1] and success != 1:
      oldpword = input("Incorrect password. Try again: ")

def getUsername():
  loop = 1
  global database
  while loop == 1:
    username = input("\nEnter your Username: ")
    if len(database) == 1:
      while username == database[0][0]:
        username = input("Username taken. Try again: ")
    else:
      for counter in range(len(database)):
       while username == database[counter][0]:
          username = input("Username taken. Try again: ")
    return username

def getMaster():
  global database
  username = input("Enter your Master Username: ")
  password = input("Enter your Master Password: ")
  database.append([username,password,"%.2f" % round(random.uniform(1,1000),2)])

def Login():
  global save
  success = 0
  username = input("\nPlease enter your Username: ")
  for counter in range(0,len(database)):
    if username == database[counter][0]:
      save = counter
      success = 1
  if username != database[counter][0] and success != 1:
    print("Username not found.")
  if success == 1:
    password = input("Please enter your Password: ")
    logged = 0
    while logged == 0:
      if password == database[save][1]:
        print("\nSucessful login.")
        logged += 1
        return logged

      else:
        while password != database[save][1]:
          password = input("Incorrect password. Try again: ")


def LoggedIn():
  global masterloop
  global database
  global save
  balance = database[save][2]
  loop = 1
  while loop == 1:
    print("\nWhich of the following would you like to do?")
    print("\nA) View current balance")
    print("B) Deposit cash")
    print("C) Withdraw cash")
    print("D) Change your password")
    choice = input("").lower()

    if choice == "a":
      print("\nYour current account balance is:")
      print("           £"+str(balance))
    elif choice == "b":
      depamount = float(input("\nHow much would you like to deposit? "))
      print("Processing..")
      balance = float(balance) + depamount
      print("\nYour new current account balance is:")
      print("           £"+str(balance))

    elif choice == "c":
      withamount =  float(input("\nHow much would you like to withdraw? "))
      print("Processing..")
      while withamount > float(balance):
        print("\nYou do not have enough money.")
        print("Your current account balance is:")
        print("           £"+str(balance))
        withamount = float(input("\nPlease enter how much you would like to withdraw now: "))
      balance = float(balance) - withamount
      print("Your new current account balance is:")
      print("           £"+str(balance))
    elif choice == "d":
      changePassword()
    continuing = input("\nWould you like to continue? ").lower()
    if continuing == "yes":
      continue
    else:
      break


getMaster()
masterloop = 1
while masterloop == 1:
  choice = input("\nWould you like to login, create a new account or exit?").lower()
  if choice == "login":
    logged = Login()
    if logged == 1:
      LoggedIn()
  elif choice == "exit":
    masterloop -= 1
  else:
    username = getUsername()
    password = getPassword(attempt)
    database.append([username,password,"%.2f" % round(random.uniform(1,1000),2)])