package domaci09;

import java.util.ArrayList;
import java.util.Scanner;

public class Domaci01 {

    // Kolekcije u kojima se čuvaju podaci o korisnicima
    public static ArrayList<String> firstNames = new ArrayList<String>();
    public static ArrayList<String> lastNames = new ArrayList<String>();
    public static ArrayList<String> usernames = new ArrayList<String>();
    public static ArrayList<String> passwords = new ArrayList<String>();
    public static ArrayList<String> emails = new ArrayList<String>();
    public static ArrayList<String> ids = new ArrayList<String>();

    public static Scanner scanner = new Scanner(System.in);

    /**
     * Validira ime (počinje velikim slovom)
     */
    public static boolean isFirstNameValid(String firstName) {
        if (firstName.equals("")) {
            return false;
        }

        return Character.isUpperCase(firstName.charAt(0));
    }

    /**
     * Validira prezime (počinje velikim slovom)
     */
    public static boolean isLastNameValid(String lastName) {
        if (lastName.equals("")) {
            return false;
        }

        return Character.isUpperCase(lastName.charAt(0));
    }

    /**
     * Validira korisničko ime (sadrži samo slova)
     */
    public static boolean isUsernameValid(String username) {
        if (username.equals("")) {
            return false;
        }

        boolean containsLettersOnly = true;
        for (int i = 0; i < username.length(); i++) {
            if (!Character.isLetter(username.charAt(i))) {
                containsLettersOnly = false;
                break;
            }
        }

        return containsLettersOnly;
    }

    /**
     * Validira lozinku (sadrži bar jedno malo slovo, veliko slovo, cifru i specijalni znak
     * i ima između 6 i 12 znakova)
     */
    public static boolean isPasswordValid(String password) {
        if (password.equals("")) {
            return false;
        }

        boolean isValidLength = password.length() >= 6 && password.length() <= 12;

        boolean containsDigit = false;
        for (int i = 0; i < password.length(); i++) {
            if (Character.isDigit(password.charAt(i))) {
                containsDigit = true;
                break;
            }
        }

        boolean containsLowerCaseLetter = false;
        for (int i = 0; i < password.length(); i++) {
            if (Character.isLowerCase(password.charAt(i))) {
                containsLowerCaseLetter = true;
                break;
            }
        }

        boolean containsUpperCaseLetter = false;
        for (int i = 0; i < password.length(); i++) {
            if (Character.isUpperCase(password.charAt(i))) {
                containsUpperCaseLetter = true;
                break;
            }
        }

        boolean containsSpecialCharacter = false;
        for (int i = 0; i < password.length(); i++) {
            if (!Character.isLetter(password.charAt(i)) && !Character.isDigit(password.charAt(i))) {
                containsSpecialCharacter = true;
                break;
            }
        }

        return isValidLength && containsDigit && containsLowerCaseLetter && containsUpperCaseLetter && containsSpecialCharacter;
    }

    /**
     * Validira e-mail adresu (sadrži znak @)
     */
    public static boolean isEmailValid(String email) {
        if (email.equals("")) {
            return false;
        }

        return email.contains("@");
    }

    /**
     * Validira JMBG (ima tačno 13 cifara)
     */
    public static boolean isIDValid(String id) {
        if (id.equals("")) {
            return false;
        }

        boolean containsDigitsOnly = true;
        for (int i = 0; i < id.length(); i++) {
            if (!Character.isDigit(id.charAt(i))) {
                containsDigitsOnly = false;
                break;
            }
        }

        return id.length() == 13 && containsDigitsOnly;
    }

    /**
     * Registracija korisnika
     */
    public static void register() {
        String firstName;
        do {
            System.out.print("First Name: ");
            firstName = scanner.nextLine();
        } while (!isFirstNameValid(firstName));
        firstNames.add(firstName);

        String lastName;
        do {
            System.out.print("Last Name: ");
            lastName = scanner.nextLine();
        } while (!isLastNameValid(lastName));
        lastNames.add(lastName);

        String username;
        do {
            System.out.print("Username: ");
            username = scanner.nextLine();
        } while (!isUsernameValid(username));
        usernames.add(username);

        String password;
        do {
            System.out.print("Password: ");
            password = scanner.nextLine();
        } while (!isPasswordValid(password));
        passwords.add(password);

        String email;
        do {
            System.out.print("E-mail: ");
            email = scanner.nextLine();
        } while (!isEmailValid(email));
        emails.add(email);

        String id;
        do {
            System.out.print("ID: ");
            id = scanner.nextLine();
        } while (!isIDValid(id));
        ids.add(id);
    }

    /**
     * Prikaz svih korisnika
     */
    public static void list() {

        System.out.printf("|  First Name  |     Last Name     |   Username   |   Password   |          E-Mail          |       ID      |\n");
        for (int i = 0; i < usernames.size(); i++) {
            System.out.printf("| %12s | %17s | %12s | %12s | %24s | %13s |\n", firstNames.get(i), lastNames.get(i), usernames.get(i), passwords.get(i), emails.get(i), ids.get(i));
        }
    }

    /**
     * Prijavljivanje korisnika
     */
    public static void login() {
        System.out.print("Username: ");
        String username = scanner.nextLine();
        System.out.print("Password: ");
        String password = scanner.nextLine();

        for (int i = 0; i < usernames.size(); i++) {
            if (usernames.get(i).equals(username) && passwords.get(i).equals(password)) {
                System.out.println("Hello " + firstNames.get(i) + " " + lastNames.get(i) + ".");
                return;
            }
        }
        System.out.println("Wrong username or password.");
    }

    public static void main(String[] args) {

        firstNames.add("Marko");
        lastNames.add("Marković");
        usernames.add("marko.markovic");
        passwords.add("1!aAAA");
        emails.add("marko.markovic@gmail.com");
        ids.add("1234567890123");

        firstNames.add("Nikola");
        lastNames.add("Nikolić");
        usernames.add("nikola.nikolic");
        passwords.add("1!aAAA");
        emails.add("nikola.nikolic@gmail.com");
        ids.add("1234567890123");

        String answer = null;

        do {
            // Prikaz menija
            System.out.println("Menu:");
            System.out.println("1. Register");
            System.out.println("2. List");
            System.out.println("3. Login");
            System.out.println("x. Exit");

            answer = scanner.nextLine();

            // Poziv izabrane funkcije
            switch (answer) {
            case "1":
                register();
                break;
            case "2":
                list();
                break;
            case "3":
                login();
                break;
            case "x":
                break;
            default:
                System.out.println("Wrong option. Please try again.");
            }

        } while (!answer.equals("x"));

        scanner.close();
    }
}