import java.io.File;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.Scanner;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class LogInTest {



	public static void main(String[] args) throws NoSuchAlgorithmException {
		// TODO Auto-generated method stub
		Scanner input = new Scanner (System.in);

		try {

			DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
			DocumentBuilder db = dbf.newDocumentBuilder();
			Document doc = db.parse(new File("salesperson.xml"));

			NodeList salesuser = doc.getElementsByTagName("salesperson");

		    Element docEle = doc.getDocumentElement();
		    NodeList nl = docEle.getChildNodes();

		    /*
		    if (nl != null && nl.getLength() > 0) {
		        for (int i = 0; i < nl.getLength(); i++) {
		            if (nl.item(i).getNodeType() == Node.ELEMENT_NODE) {
		                Element el = (Element) nl.item(i);
		                if (el.getNodeName().contains("staff")) {
		                    names [i] = el.getElementsByTagName("name").item(0).getTextContent();
		                    password [i] = el.getElementsByTagName("password").item(0).getTextContent();

		                }
		            }
		        }
		    }
			*/
			for (int i = 0; i < salesuser.getLength(); i++) {
				Node usernode = salesuser.item(i);
			String[]	names = new String [salesuser.getLength()];
			String[]	password = new String [salesuser.getLength()];

				if(usernode.getNodeType() == Node.ELEMENT_NODE) {

					Element firstElement = (Element)usernode;

					NodeList nameList = firstElement.getElementsByTagName("name");
					Element nameElement = (Element)nameList.item(0);

					NodeList textFNList = nameElement.getChildNodes();
					names [i] = ((Node)textFNList.item(0)).getNodeValue().trim();

					NodeList passwordList = firstElement.getElementsByTagName("password");
					Element firstNameElement = (Element)passwordList.item(0);

					NodeList textFNList1 = firstNameElement.getChildNodes();
					password [i] = ((Node)textFNList1.item(0)).getNodeValue().trim();

					//System.out.println(names[i]+ "\t" + password[i]);
				}
				int count = 0;

			while (count != 2){
				System.out.println("Enter username: ");
				String username = input.nextLine();

				System.out.println("Enter password: ");
				String pass = input.nextLine();

				count++;
					MessageDigest passwordhash = MessageDigest.getInstance("MD5");
					passwordhash.reset();
					passwordhash.update(pass.getBytes());
					byte[] digest = passwordhash.digest();
					BigInteger bigint = new BigInteger(1, digest);
					String hashed = bigint.toString(16);
					while (hashed.length() < 32) {
						hashed = "0" + hashed;
					}


				boolean found = Arrays.asList(names).contains(username);
				boolean found1 = Arrays.asList(password).contains(hashed);

				if (found == true&&found1==true){
					System.out.println(username+" & "+hashed+" is found");
					break;
				} else {
					System.out.println(username+" & "+hashed+" not found");
					continue;
				}
			}
		}

		}catch (Exception e){
			System.out.println(e.getMessage());

		}



	}

}