import time #time.sleep()

import sys #sys.exit()

import os #os.path.isfile()

import json #json.load() , json.dump()

quizzes = ["Maths",", Business"] #names of the quizzes

if not os.path.isfile("users.txt"):  #checks for the file "users.txt"
    userfile = open("users.txt","w") #if it doesn't exist, it is created

    userfile.close()

if not os.path.isfile("teacher_password.txt"):
    with open("teacher_password.txt","w") as teacherfile:
        teacherfile.write("admin456") #password for the teacher account is written to file

if not os.path.isfile("quizzes.txt"):
    with open("quizzes.txt","w") as quizfile:
        for x in quizzes: #each variable in quizzes is stored in a temporary variable: x
            quizfile.write(x) #and then written to the file


def start():
    userInput = input("Do you have an account? Y or N: ")

    while userInput.lower() not in ("y","n"): #userInput.lower() converts the variable to lower case letters
        userInput = input("Please enter Y or N: ") #this loop will not be broken until the user enters a valid input

    if userInput.lower() == "y":
        login()

    else:
        register()


def register():
    name = input("Please enter your name: ")

    age = input("Please enter your age: ")

    while 1:

        try:
            age = int(age) #converts age to an integer
            break #breaks the loop

        except ValueError: #but if age can't be converted to an integer (e.g. "one")
            age = input("Please enter a vaild number: ") #the user is asked for their age again

    yearGroup = input("Please enter your year group: ")

    username = name[:3] + str(age) #takes the first three letters of the user's name and combines it with their age to create their username

    with open("users.txt") as usercheck:
        users = usercheck.read() #users contains the contents of "users.txt"

    incorrectinputs = ["/",":","\"","?","<",">","|","[\]"] #file names cannot contain these characters so they can't be in username

    for x in username: #stores each character in username in a temporary variable - x
        if x in incorrectinputs: #if x is in the list variable "incorrectinputs"
            username = username.strip(x) #it is erased from username

    while username in users: #if the username has been stored in "users.txt" already
        username = username + "1" #"1" is added to the username to ensure it's unique

    with open("users.txt","a") as userfile:
        userfile.write(username + ", ") #the username is added to "users.txt"

    with open(username +"_info.txt","w") as userinfo: #creates a file with the users info
        userinfo.write("username: " + username + "\n")

        userinfo.write("name: " + name + "\n")

        userinfo.write("age: " + str(age) + "\n")

        userinfo.write("year group: " + str(yearGroup) + "\n") #all of the users details are stored in this file

    print("Welcome ", name, ", your username is: ", username)

    password = input("Please create a password: ")

    with open(username + "_password.txt","w") as passwordfile:
        passwordfile.write(password) #writes the user's password to a password file

    print("You will now be prompted to log in...")

    time.sleep(0.5) #creates a half-second pause

    login()


def login():
    givenUsername = input("Please enter your username: ")

    givenPassword = input("Please enter your password: ")

    if givenUsername.lower() == "teacher": #checks if the user is trying to log in to the teacher account
        with open("teacher_password.txt") as teacherpwfile:  #opens the teacher's password file
            teacherpw = teacherpwfile.read() #the password is read from the file

        if givenPassword == teacherpw:
            admin()

        else:
            print("Incorrect password. Please try again.")
            login()

    try:
        with open(givenUsername + "_password.txt") as pwfile: #tries to open the user's password file
            password = pwfile.read() #the password is read from the file

    except IOError: #unless the file doesn't exist which means that the user doesn't exist
        repeat = input("Invalid username. Press T to try again, or to register, press R: ") #gives the user the option to try again or register

        while repeat.lower() not in ("r","t"): #checks if the users input is valid
            repeat = input("Please enter T or R: ")

        if repeat.lower() == "t":
            login()

        else:
            register()

    if givenPassword == password:
        print("Welcome, ", givenUsername)

        username = givenUsername

        if not os.path.isfile(username +"_results.txt"): #checks for the user's results file
            with open(username +"_results.txt", "w") as resultsfile: #if it doesn't exist the file is created
                resultsfile.write("Username: " + username + "\n") #and the user's username is written to the file

        with open("username.json","w") as u:
            json.dump(username, u) #stores the username in a json file

        main_menu()

    else:
        print("Incorrect password. Please try again.")
        login()


def main_menu():
    with open("username.json") as u:
            username = json.load(u) #loads the username from a json file

    with open(username +"_results.txt") as resultsfile: #opens the user's results file
        check = resultsfile.read() #the contents of the file are stored in "check"

    if check.count("Quiz") == 6: #there are six quizzes, so if "Quiz" appears in the file 6 times, it means the user has taken every quiz
        print("You have taken every quiz. You will now be logged out.")
        start()

    with open("quizzes.txt") as quizfile:
        quizzes = quizfile.read() #reads the names of all the quizzes from "quizzes.txt"

    subject = input("Please choose a quiz on one of the following - " + quizzes + ": ")

    while subject.lower() not in quizzes.lower(): #checks if the users input is a valid quiz
        subject = input("Please enter one of the following - " + quizzes + ": ")

    difficulty = input("Choose a difficulty, Easy, Medium or Hard: ")

    while difficulty.lower() not in ("easy","medium","hard"): #checks if the user has entered a valid difficulty
        difficulty = input("Please enter Easy, Medium or Hard: ")

    quizname = (subject.lower() + "quiz" + difficulty.lower()) #creates the name of the quiz from the subject and difficulty

    with open("quizname.json", "w") as q:
        json.dump(quizname, q) #the quiz name is stored in a json file

    with open("difficulty.json", "w") as d:
        json.dump(difficulty, d) #the difficulty is stored in a json file

    quiz()


def quiz():
    with open("username.json") as u:
            username = json.load(u)

    with open("quizname.json") as q:
        quizname = json.load(q) #loads quiz name from a json file

    with open("difficulty.json") as d:
        difficulty = json.load(d) #loads difficulty from a json file

    with open(username +"_results.txt") as resultsfile:
        check = resultsfile.read()

    if quizname in check: #checks if the quiz name is in the user's results file
        print("You have already taken this quiz.") #if it is, it means they have taken this quiz
        main_menu()

    results = open(username + "_results.txt","a")
    results.write("Quiz: " + quizname + "\n") #adds the name of the quiz to the results file

    questions = []

    with open(quizname + ".csv") as questionfile: #opens the question file
        while 1: #creates a never-ending loop
            in_line = questionfile.readline() #stores a line of the question file to the variable "in_line"

            if not in_line: #checks if "in_line" is empty, which would mean that all of the questions have been read from the file
                break

            questions.append(in_line) #appends each line of the question file to the list variable "questions"

    count = 0 #number of answered questions

    score = 0 #number of correctly answered questions

    for line in questions: #each line of the question file is stored in a temporary variable - "line"
        inputs = line.split(",") #"inputs" is a list variable made by separating "line" into different values by a comma

        question = inputs[0] #the first value in any of the files is always the question

        a = inputs[1] #the second value is always "a"

        b = inputs[2] #the third value is always "b"

        if "correct" in a: #checks for the word "correct" in "a"
            a = a.replace("correct","") #if it's there, it's erased from "a"

            answer = "a" #the correct input becomes the letter "a"

            correctanswer = a #and the correct answer is "a"

        else:
            b = b.replace("correct","") #the same is done for "b"

            answer = "b"

            correctanswer = b

        if difficulty.lower() == "easy": #checks if the difficulty is easy
            question += (" Is it A: " + a + " or B: " + b) #if it is then there are only two options: A or B

            validinputs = ["a","b"]

            invalidinput = ("Please enter A or B.") #this message is outputted when the user's input is invalid

        try:
            c = inputs[3] #checks the question file for a fourth value: "c"

            if "correct" in c:
                c = c.replace("correct","")

                answer = "c"

                correctanswer = c

            if difficulty.lower() == "medium":
                question += " Is it A: " + a + ", B: " + b + " or C: " + c #if the difficulty is medium there are three options: A, B or C

                validinputs = ["a","b","c"]

                invalidinput = ("Please enter A, B or C.")

        except IndexError: #if "c" doesn't exist
            pass #nothing happens

        try:
            d = inputs[4] #checks for a fifth value: "d"

            if "correct" in d:

                d = d.replace("correct","")

                answer = "d"

                correctanswer = d

            if difficulty.lower() == "hard":

                question += " Is it A: " + a + ", B: " + b + ", C: " + c + " or D: " + d #there are four options for hard: A,B,C and D

                validinputs = ["a","b","c","d"]

                invalidinput = ("Please enter A, B, C or D.")

        except IndexError:
            pass

        userAnswer = input(question) #asks the user for their answer

        while userAnswer.lower() not in validinputs: #checks if the user's input is valid
            print(invalidinput)

            userAnswer = input(question)

        if userAnswer.lower() == answer:
            print("Correct!")

            results.write("Question: " + question + "Answer: " + userAnswer + " - Correct\n") #writes the question, answer and result to the user's results file

            score += 1 #adds one to the user's score

        else:
            print("Sorry, the answer was: ", correctanswer) #shows the user the correct answer if they got it wrong

            results.write("Question: " + question + "Answer: " + userAnswer + " - Incorrect\n")

        count += 1 #adds 1 to the # of questions answered

    print("Your final score is: ", score) #outputs final score

    percentage = (score / count) * 100 #calculates percentage from the score and total number of questions

    if not os.path.isfile(quizname + ".json"): #checks for a json file containing the variables "totalscore" and "scorecount"
        scores  = open(quizname + ".json","w")#if it doesn't exist, the file is created

        scores.close()

        totalscore = 0

        scorecount = 0 #and both of the variables are set at 0

    else: #if it does exist:
        with open(quizname + ".json") as t:
            totalscore = json.load(t)

        with open(quizname + ".json") as s:
            json.load(s) #both variables are loaded from the file

    totalscore += score #the users score is added to the total number of scores

    scorecount += 1 #the number of times the quiz has been taken increases by 1

    with open(quizname + ".json","w") as s:
        json.dump(scorecount, s)

    with open(quizname + ".json","w") as t:
        json.dump(totalscore, t) #the variables are saved to the json file

    avgscore = totalscore / scorecount #the average score is calculated using "totalscore" and "scorecount"

    print("Your percentage is: ", percentage, "%") #outputs percentage

    if percentage == 0:
        grade = "E" #1 question is worth 20%

    elif percentage == 20:
        grade = "D" #every correct question moves you up a grade

    elif percentage == 40:
        grade = "C"

    elif percentage == 60:
        grade = "B"

    elif percentage == 80:
        grade = "A"

    else:
        grade = "A*" #100% is an A*

    print("Your grade is: ", grade) #outputs grade

    try:
        quizresults = open(quizname + "_results.txt","a") #tries to open the results file for the quiz

    except IOError: #unless it doesn't exist
        quizresults = open(quizname + "_results.txt","w") #in which case it's created

    quizresults.write(username + ": " + str(score) + "\n") #the username and score is written to this file

    quizresults.close()

    results.write("\nFinal score: " + str(score) + "\n") #the user's final score is written to their results file

    results.write("Grade: " + grade + "\n********************\n") #along with their grade

    results.close()

    with open(quizname + "_avgscore.txt","w") as average:
        average.write(str(avgscore)) #the average score for the quiz is saved to another text file

    menu()


def menu():
    with open("username.json") as u:
            username = json.load(u)

    with open(username + "_results.txt") as check: #opens the user's results file
        resultscheck = check.read() #the contents of the file are stored in "resultscheck"

    if resultscheck.count("Quiz") == 6:
        print("You have taken every quiz. You will now be logged out.")

        start()

    print("""
    If you would like to do another quiz, press C.
    If you would like to log out, press E.
    If you would like to quit, press Q.""")

    userInput = input("Please choose one of the above options to continue: ")

    while userInput.lower() not in ["c","e","q"]: #checks if the user's input is valid
        userInput = input("Please enter C, E or Q: ")

    if userInput.lower() == "q":
        sys.exit() #exits the program

    elif userInput.lower() == "e":
        start()

    else:
        main_menu()


def admin():
    print("""
    If you would like to check a student's results, press S.
    If you would like to check the results for a quiz, press R.
    If you would like to log out, press E.
    If you would like to quit, press Q""")

    choice = input("Please choose one of the above options to continue: ")

    while choice.lower() not in ["s","r","e","q"]: #checks if the user's input is valid
        choice = input("Please enter S, R, E or Q: ")

    if choice.lower() == "s":
        user_report()

    elif choice.lower() == "r":
        quiz_report()

    elif choice.lower() == "e":
        start()

    else:
        sys.exit()


def user_report():
    with open("users.txt") as userfile:
        users = userfile.readline() #the contents of "users.txt" is stored in users

    user = input("Please enter their username: ")

    while user not in users: #if user is not in users then the user doesn't exist
        user = input("The username you entered does not exist. Please try again: ")

    try:
        with open(user + "_results.txt") as report: #tries to open the file containing the user's results
            results = report.read() #the contents of the file are stored in "results"

        print(results) #outputs the users results

    except IOError: #unless the file doesn't exist
        print("This user has not completed any quizzes.")

    admin()


def quiz_report():
    with open("quizzes.txt") as quizfile: #"quizzes.txt" contains the name of every quiz
        quizzes = quizfile.read()

    subject = input("Please enter one of the following - " + quizzes + ":")

    while subject.lower() not in quizzes.lower():
        quizname = input("Please enter one of the following - " + quizzes + ":")

    difficulty = input("Choose a difficulty, Easy, Medium or Hard: ")

    while difficulty.lower() not in ("easy","medium","hard"):
        difficulty = input("Please enter Easy, Medium or Hard.")

    chosenquiz = (subject.lower() + "quiz" + difficulty.lower()) #creates the quizname from the subject and difficulty

    try:
        quizresults = open(chosenquiz + "_results.txt") #tries to open the results file for the chosen quiz

        average = open(chosenquiz + "_avgscore.txt") #as well as the file containing the average score

    except IOError: #unless these files do not exist
        print("No one has taken this quiz yet.")

        admin()

    avgscore = average.read() #the average score is read from the file

    average.close()

    print("Average Score: " + avgscore)

    student_list = []
    score_list = []

    for line in quizresults: #stores each line in quizresults in the temporary variable "line"
        lines = line.split(": ") #creates the list variable "lines" from "line" with the values being separated by a colon

        student = lines[0] #the username is behind the colon so its stored in the variable "student"

        score = int(lines[1]) #the score is in front of the colon so its converted to an integer and stored in the variable "score"

        student_list.append(student) #"student" is added to the list variable "student_list"

        score_list.append(score) #likewise for "score" and "score_list"

    quizresults.close()

    top_score = max(score_list) #takes the highest score from the list

    top_student = student_list[score_list.index(top_score)] #and the username of the corresponding student

    print(top_student + " achieved " + str(top_score) + ", the highest score.")

    with open(top_student + "_info.txt") as details:
        userinfo = details.read() #reads the students details from their info file

    print("The details of this user are:" + userinfo) #outputs the user's details

    admin()


start()