from random import *
import csv
import string
def menu_selector():
    #gets user input and validates it.
    invalid_input = True
    while invalid_input:
        try:
            user_choice = int(input('choose an option'))
            if user_choice == 1:
                #print('Register was selected')
                register_user()
                invalid_input = False
            elif user_choice == 2:
                #print('Login was selected')
                login_user()
                invalid_input = False
            elif user_choice == 3:
                #print('Quit was selected')
                invalid_input = False
                exit()
            else:
                print('Only numbers 1, 2 or 3 can be entered')
        except ValueError:
            print('Only numbers 1, 2 or 3 can be entered')


def register_user():
    print('Register user invoked')
    write_user_data()


def login_user():
    login()


def main_menu():
    #displays main menu
    title = '''
    Welcome to my system
    --------------------'''
    menu = '''
    1. Register
    2. Login
    3. Quit'''

    print(title)
    print()
    print(menu)
    menu_selector()

def loginmenu(username):
    title = 'Welcome '+ username
    deco = '-'

    menu = '''
    1. Quiz
    2. Manage (Admin Only)
    3. Quit'''

    print(title)
    print(deco *len(title))
    print()
    print(menu)


def test():
    print("Complete")



def login():
    with open("student_data.csv", "r") as file:
        read=csv.reader(file)
        invalid_login = True
        while invalid_login:
            username = input ('What is your username')
            password = input ('What is your password')
            for each in read:
                #print (each)
                if username in each and password in each:
                    print ('Login Successful')
                    invalid_login = False
                    break

                elif username not in each and password not in each:
                    print('Incorrect username or password')
    loginmenu(username)

def get_validate_userdata():
    missing_data = True
    while missing_data:
        name = input ('Enter your name: ')
        surname = input ('Enter your surname: ')
        age = input ('Enter your age')
        group = input ('Enter your yeargroup: ')
        password = password_check()
        if name == '' or surname == '' or group == '' or password == '' or age == '':
            print ('Fields cannot be blank')
        else:
            missing_data = False
            username =str(randint(10,99))+name[0:2]+surname[0:2]
            return (username, name, surname, group, age, password)
            break

def password_check():
    incorrect_data = True
    while incorrect_data:
        password = input ('Enter your password: ')
        for each in password:
            if each in string.ascii_uppercase:
                print('')
                incorrect_data = False
                break
        else:
                print ('Weak password, Your password must contain a capital letter')
    return password

def write_user_data():
    data = get_validate_userdata()
    data_to_write = []
    for each in data:
        data_to_write.append(each)
    print (data_to_write)
    with open ('student_data.csv','a',newline="") as studentFile:
        studentFileWriter = csv.writer(studentFile)
        studentFileWriter.writerow(data_to_write)
        print('data written successfully')
    studentFile.close()