"""
Homework:
def getUsers() updated to your version! and make sure its in the correct file path.
Or just copy the text in to the file.

Then implement create user.
After that if you have time comment all the existing code explaining how it works.
"""
import getpass
import os
ALPHABET = ['A', 'Q', 'W', 'S', 'Z', 'X', 'C', 'D', 'E', 'R', 'F', 'V', 'B', 'G', 'T', 'Y', 'H', 'N', 'M', 'J', 'K',
            'L', 'O', 'I', 'U', 'P', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0']


USRERS = "users-new.csv"


def getUserLogin(userMsg="user: ", pswMsg="password: "):
    """
    this will ask the user for a user name and password
    """
    return [raw_input(userMsg), getpass.getpass(pswMsg)]


def getUsers():
    """
    this will open the csv file and split it at the commas to create a list of tow element lists
    """
    # REPLACE THIS WITH THE CSV FILE!!!
    # and if you get to the stage in your textbook about the csv module then have
    # a go at implementing it. Otherwise thats what we plan on doing next week.

    fileRead = File(USRERS, "r")
    for i in range(len(fileRead)):
        fileRead[i] = fileRead[i].replace("\n", "")
        fileRead[i] = fileRead[i].split(",")
    return fileRead


def login():
    """
    this function will call for a login
    then get a list of user logins
    and then call to check if any of the users where real
    and then return true
    """
    user = getUserLogin()
    users = getUsers()  # [["user", "psw"], []]
    user_index = findUser(users, user[0])
    if user_index != -1:
        if user[1] == users[user_index][1]:
            return True
    return False


def findUser(users, username):
    """
    this function will look through the list of users
    and then return if any were found
    """
    userFound = False
    count = 0
    while not userFound and count < len(users):
        if users[count][0] == username:
            userFound = True
        else:
            count += 1
    if not userFound:
        count = -1
    return count


def UserExists(user):
    """
    this will go through a list of users and check if any of the users are already the same
    """
    # how can we use findUser with this?
    OpenUsers = File(USRERS, "r")
    for i in range(len(OpenUsers)):
        OpenUsers[i] = OpenUsers[i].replace("\n", "").split(",")
        if OpenUsers[i][0] == user:
            print("Username already used")
            return False
    return True


def createUser():
    """
    check usernames doesn't already exist
    check passwords inputs are the same
    and basic password strength test e.g. length, numbers, specail chars
    invalid chars not in data? might not be needed
    """
    passwordSafe = False

    running = 1
    while running == 1:
        newUser = raw_input("Type your user name >>>")
        if UserExists(newUser):
            Password = getpass.getpass("Type your password >>>")
            PasswordC = getpass.getpass("Confirm your password >>>")
            if Password == PasswordC:
                For = len(Password)  # Bad varaible name with upper case but also meaningful?
                while not passwordSafe and For >= 0:
                    For -= 1
                    if Password[For] in ALPHABET:
                        passwordSafe = True

            if passwordSafe:
                UsernamePsw = str("\n" + newUser + "," + Password)
                File(USRERS, "a", UsernamePsw)
                running = 0
                main()


def main():
    """
    this function will ask the user for an option either Login or New Account
    then it will call ether login or createUser
    """
    # good meaningful varaible names, but meaningful data types? 1 True and 0 False would be a lot better
    choosing = 1
    running = True
    if not os.path.isfile(USRERS):
        newFile=open(USRERS,"wb")
        newFile.write("")
        newFile.close()
    while running:
        choose = raw_input("Type 1 for Login \nInput 2 for a new acount\n\n>>>")
        if choose == "1":
            choosing = False
            trys = 3
            quitLoop = False
            while not login() and trys > 0 and not quitLoop:
                trys-=1
                print("try agian")
            running = False
            print("access granted")
        if choose == "2":
            choosing = False
            createUser()
        elif choosing:
            print("plese type 1 or 2")


def File(fileName, task, usernamePsw=""):
    """
    this segment will open a file under the variable task and then
    either read the file or write to it.
    """
    if task == "r":
        fileOpen = open(USRERS, task)
        fileRead = fileOpen.readlines()
        # close is never called here
        fileOpen.close()
        return fileRead
    if task == "a" or "w":
        # filename should be used here instead of USRERS
        # even better use a global constant for file
        # also we want to work on the logic here but don't worry about that
        fileOpen = open(USRERS, task)
        fileOpen.writelines(usernamePsw)
        fileOpen.close()



main()