import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;
import java.util.Scanner;
import java.util.StringTokenizer;
import java.util.concurrent.TimeUnit;

public class pack {

	// Program wide variables
	static Boolean debug = false; // True for debug mode
	static String invalidInput = "Please only input true/false or t/f";
	static String invalidLogin = "Sorry that username or password is not correct, please try again.";
	static String tooManyAttempts = "Sorry you have exceeded your 3 trys! Try again later.";
	static String loginPromptUser = "Please enter your username.";
	static String loginPromptUserDone = "Please enter your username or done to end the program.";
	static String loginPromptPass = "Please enter your password.";
	static String startParse = "Parsing your users file.";
	static String enterDone = "Enter done to quit.";
	static String firstName;
	static String lastName;
	static String username;
	static int quest = 4;
	static int testBankQ = 124;
	static int timesRan = 0;
	static String[] answeredQ = new String[quest];
	static Boolean[] answeredA = new Boolean[quest];
	static Boolean[] answeredC = new Boolean[quest];

	// idk what these are called
	static DateFormat dateFormat = new SimpleDateFormat("MM-dd-yyyy_HH-mm");
	static Date date = new Date();
	static Scanner kb = new Scanner(System.in);

	// magic
	public static void main(String Args[]) throws IOException {

		Random rand = new Random();
		Boolean run = true;
		int count = 0, right = 0, wrong = 0;

		// Debug false
		if (!debug) {
			while (run) {
				parse("UsersInfo.txt", "NewUsers.txt", 1);
				if (login(3, "NewUsers.txt")) { // Check login creds
					long startTime = System.currentTimeMillis();

					while (count < quest) {
						int r = rand.nextInt(testBankQ);

						System.out.println(count + 1 + ". " + read(r, "TestBank.txt"));
						boolean ans = input();
						answeredQ[count] = read(r, "TestBank.txt");
						answeredA[count] = ans;
						answeredC[count] = parseA(read(r, "Answers.txt"));

						if (ans != parseA(read(r, "Answers.txt"))) {
							wrong++;
						} else if (ans == parseA(read(r, "Answers.txt"))) {
							right++;
						}
						count++;
					}

					// Wraping it all up
					p("You got " + wrong + " wrong and " + right + " correct.");
					long endDiff = (System.currentTimeMillis() - startTime);

					makeReport(firstName, lastName, username, printTime(endDiff), right);
					timesRan++;
				} else {
					close();
				}

				while (count == quest) {
					if (login(3, "NewUsers.txt")) {
						count = 0;
					} else {
						close();
					}
				}
			}
			// Debug true
		} else {
			// Insert code here
		}
	}

	// Shortens System.out.println() to p()
	public static String p(String in) {
		System.out.println(in);
		return in;
	}

	// Close the program
	public static void close() {
		System.exit(0);
	}

	// Generates a report report(first, last, score, time, array of answers)
	public static void makeReport(String first, String last, String user, String time, int score) throws IOException {
		String fileName = user + "_COSC_236_Quiz_" + dateFormat.format(date) + ".txt";
		try {
			File file = new File(fileName);
			file.createNewFile();
		} catch (IOException e) {
			System.out.println("Ur wrong:");
			e.printStackTrace();
		}

		FileWriter out = new FileWriter(fileName);

		double percent = (((double) score) / ((double) quest) * 100);
		out.write("Name: " + first + " " + last + "\n");
		out.write("Score: " + percent + "%\n");
		out.write("Elapsed time: " + time + "\n");

		for (int i = 0; i < answeredQ.length; i++) {
			out.write(i + 1 + ". " + answeredQ[i]);
			if (answeredC[i] == answeredA[i]) {
				out.write(" - Correct!\n\n");
			} else {
				out.write(" - Wrong!\nThe correct answer is " + answeredC[i] + "\n\n");
			}
		}
		out.close();
	}

	// fuck this method
	public static String printTime(long endDiff) {
		StringBuilder sb = new StringBuilder(64);
		long startValue = endDiff;
		long days = TimeUnit.MILLISECONDS.toDays(endDiff);
		endDiff = endDiff - TimeUnit.DAYS.toMillis(days);
		long hours = TimeUnit.MILLISECONDS.toHours(endDiff);
		endDiff = endDiff - TimeUnit.HOURS.toMillis(hours);
		long minutes = TimeUnit.MILLISECONDS.toMinutes(endDiff);
		endDiff = endDiff - TimeUnit.MINUTES.toMillis(minutes);
		long seconds = TimeUnit.MILLISECONDS.toSeconds(endDiff);
		if (startValue >= 86400000) {
			sb.append(days);
			sb.append(" Days, ");
			sb.append(hours);
			sb.append(" hours, ");
			sb.append(minutes);
			sb.append(" minutes and ");
			sb.append(seconds);
			sb.append(" seconds.");
		} else if (startValue >= 3600000) {
			sb.append(hours);
			sb.append(" hours, ");
			sb.append(minutes);
			sb.append(" minutes and ");
			sb.append(seconds);
			sb.append(" seconds.");
		} else if (startValue >= 60000) {
			sb.append(minutes);
			sb.append(" minutes and ");
			sb.append(seconds);
			sb.append(" seconds.");
		} else {
			sb.append(seconds);
			sb.append(" seconds.");
		}
		return (sb.toString());
	}

	// Gets lines in a file
	public static int getLines(String file) throws IOException {
		BufferedReader reader = new BufferedReader(new FileReader(file));
		int x = 0;
		while (reader.readLine() != null) {
			x++;
		}
		reader.close();

		return x;
	}

	// Boolean login method | login(tries allowed, source file)
	public static Boolean login(int tries, String source) throws FileNotFoundException, IOException {
		if (timesRan == 0) {
			for (int x = 0; x < tries; x++) {
				p(loginPromptUser);
				String user = kb.next();
				p(loginPromptPass);
				String pass = kb.next();
				for (int i = 0; i < getLines(source); i++) {
					StringTokenizer st = null;
					st = new StringTokenizer(read(i, source));
					if (st.nextToken().equals(user)) {
						if (st.nextToken().equals(pass)) {
							username = user;
							firstName = st.nextToken();
							lastName = st.nextToken();
							return true;
						}
					}
				}
				p(invalidLogin);
			}
			p(tooManyAttempts);
			return false;
		} else {
			for (int x = 0; x < tries; x++) {
				p(loginPromptUserDone);
				String user = kb.next();
				if (user.toLowerCase().equals("done")) {
					return false;
				}
				p(loginPromptPass);
				String pass = kb.next();
				for (int i = 0; i < getLines(source); i++) {
					StringTokenizer st = null;
					st = new StringTokenizer(read(i, source));
					if (st.nextToken().equals(user)) {
						if (st.nextToken().equals(pass)) {
							username = user;
							firstName = st.nextToken();
							lastName = st.nextToken();
							return true;
						}
					}
				}
				p(invalidLogin);
			}
			p(tooManyAttempts);
			return false;
		}
	}

	// Takes valid input and outputs it as a boolean
	public static Boolean input() {
		Boolean cont = true, ans = null;

		do {
			String out = kb.nextLine().toLowerCase();

			if (out.equals("t") || out.equals("true")) {
				ans = true;
				cont = false;
			} else if (out.equals("f") || out.equals("false")) {
				ans = false;
				cont = false;
			} else {
				p(invalidInput);
			}
		} while (cont);

		return ans;
	}

	// Method that returns a string with a question read(line#, File)
	public static String read(int line, String source) throws FileNotFoundException {
		File ansFile = new File(source);
		Scanner ans = new Scanner(ansFile);
		String out = null;

		for (int i = 0; i <= line; i++) {
			if (i == line) {
				out = ans.nextLine();
			} else {
				ans.nextLine();
			}
		}
		ans.close();
		return out;
	}

	// Parse
	public static void parse(String source, String dest, int sect) throws FileNotFoundException, IOException {

		File f = new File(dest);

		if (!f.exists()) {
			FileWriter out = new FileWriter(dest);
			System.out.println(startParse);
			for (int x = 0; x < getLines(source); x++) {
				StringTokenizer st = new StringTokenizer(read(x, source));
				String[] make = new String[6];
				for (int i = 0; st.hasMoreTokens(); i++) {
					if (i == sect) {
						make[i] = passwd(10);
					} else {
						make[i] = st.nextToken();
					}
				}
				String strg = String.join(" ", make);
				out.write(strg + "\n");
			}
			out.close();
		}
	}

	// Generates a random password passwd(char#)
	public static String passwd(int length) {
		String chars = "AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz0123456789";
		StringBuilder strBldr = new StringBuilder(length);
		Random rand = new Random();

		for (int i = 0; i < length; i++)
			strBldr.append(chars.charAt(rand.nextInt(chars.length())));
		return strBldr.toString();
	}

	// Method that returns a boolean answer readA(line#, File)
	public static Boolean parseA(String source) {
		if (source.toLowerCase().equals("true")) {
			return true;
		} else {
			return false;
		}
	}
}