/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package cadastrousuario;

import com.google.gson.Gson;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Scanner;
import org.json.JSONObject;

/**
 *
 * @author RenanTeles
 */
public class CadastroUsuario {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws NoSuchAlgorithmException {
        // TODO code application logic here

        Scanner sc = new Scanner(System.in);
        System.out.println("Cadastre nome do Usuário:");
        String newUser = sc.nextLine();

        System.out.println("Cadastre Senha do Usuário:");
        String newPassword = sc.nextLine();

        String hashSenha = transformaHash(newPassword);

        Usuario user = new Usuario();
        user.setHashSenha(hashSenha);
        user.setNome(newUser);

        JSONObject objeto = new JSONObject();
        objeto.put("nome", user.getNome());
        objeto.put("senha", user.getHashSenha());

        String cadastraUser = new Gson().toJson(objeto);

        saveFileJson(cadastraUser);

    }


    private static String transformaHash(String senha) throws NoSuchAlgorithmException{

       MessageDigest md = MessageDigest.getInstance("MD5");
       md.update(senha.getBytes());
       byte[] hashMd5 = md.digest();
       String hashString = paraStringHexa(hashMd5);
       //System.out.println(hashString);
       String HashFinal = hashString.substring(0, 5);
       //System.out.println(HashFinal);

       return HashFinal;

    }

    private static String paraStringHexa(byte[] bytes) {
        StringBuilder s = new StringBuilder();
        for (int i = 0; i < bytes.length; i++) {
            int parteAlta = ((bytes[i] >> 4) & 0xf) << 4;
            int parteBaixa = bytes[i] & 0xf;
            if (parteAlta == 0) s.append('0');
            s.append(Integer.toHexString(parteAlta | parteBaixa));
        }
        return s.toString();
    }

    public static void saveFileJson (String stringJson){

        try {

            File file = new File("cadastroUser.json");
            try (FileWriter fileWriter = new FileWriter(file)) {
                fileWriter.write(stringJson);
                fileWriter.flush();
            }
        } catch (IOException e) {
        }


    }

//    private static gravaTxt(){
//
//
//
//
//    }
//
}