package labjava.p0072;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;
public class Main {
    public static void main(String[] args) throws IOException {
        while(true){
        String userName="";
        Scanner sc = new Scanner(System.in);
        int choice;
        List<Account> account = new ArrayList<>();
        account.add(new Account("admin"));
        System.out.println("Choose Option Below");
        System.out.println("1.Add Acount");
        System.out.println("2.Login");
        choice = Integer.parseInt(sc.nextLine());
        switch (choice) {
            case 1:
                    System.out.println("Add Account Infomation");
                    System.out.println("Enter Your User Name");
                    userName=sc.nextLine();
                    if(checkValid(account,userName)==false){
                    account.add(new Account(userName));
                    }
                      break;
            case 2:
                for(Account x:account){
                    System.out.println("List Account: "+x.getUserName());
                }
                    /*System.out.println("Enter Your Password");
                    String Password=sc.nextLine();
                        while(checkPassword(Password)==true){
                            System.out.println("Re-Enter Your Password");
                            Password=sc.nextLine();
                        }
                     System.out.println("Enter Your Phone Number");
                     String Phone = sc.nextLine();
                     while(checkPhone(Phone)==false){
                         System.out.println("RE-Enter Your Phone Number");
                         Phone = sc.nextLine();
                     }
                    System.out.println("Enter Your Email");
                    String email = sc.nextLine();
                    while(checkEmail(email)==false){
                        System.out.println("RE-Enter Your Email");
                        email=sc.nextLine();
                    }
                    System.out.println("Enter Your Date of Birth");
                    String DoB= sc.nextLine();
                    while(checkDate(DoB)==false){
                        System.out.println("Re-Enter Your Date of Birth");
                        DoB= sc.nextLine();
                    }
                    System.out.println("Enter Your Address");
                    String Address=sc.nextLine();
                    String MD5=generatorMD5psw(Password);
                   */
    }

    }
    }
//check valid Password
public static boolean checkPassword(String password){
    return password.isEmpty()||password==null;
}
//check valid userName
public static boolean checkValid( List<Account> x,String userName) {
              for(Account a:x){
                  if(userName.matches(a.getUserName())||userName.isEmpty()||userName==null)
                      return true;
              }
              return false;
        }
//generator MD5 password
     public static String generatorMD5psw(String message) {
        String digest = null;
        try {
            MessageDigest md5 = MessageDigest.getInstance("MD5");
            byte[] hash = md5.digest(message.getBytes("UTF-8"));
            StringBuilder sb = new StringBuilder(2 * hash.length);
            for (byte b : hash) {
                sb.append(String.format("%02x", b & 0xff));
            }
            digest = sb.toString();
        } catch (UnsupportedEncodingException | NoSuchAlgorithmException error) {}
        return digest;
    }
 public static boolean checkPhone(String phone) {
        return phone.length() == 10 || phone.length() == 11;
    }
    public static boolean checkEmail(String email) {
        String regex = "^[\\w!#$%&’*+/=?`{|}~^-]+(?:\\.[\\w!#$%&’*+/=?`{|}~^-]+)*@(?:[a-zA-Z0-9_]+\\.)+[\\w]{2,7}$";
        return email.matches(regex);
    }
    public static boolean checkDate(String inDate) {
        DateFormat date = new SimpleDateFormat("dd/MM/yyyy");
        date.setLenient(false);
        try {
            date.parse(inDate.trim());
        } catch (ParseException err) {
            System.out.println("re-Enter Your Date of Birth");
            return false;
        }
        return true;
    }


     }