package src;

import java.io.File;
import java.io.FileWriter;
import java.io.BufferedWriter;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;
import java.util.regex.Pattern;
import java.util.regex.Matcher;

public class Principal {

  public static boolean b = false;

  public static void main(String[] args) throws IOException {
    Scanner scan = new Scanner(System.in);
    String regex      =   "([\\w\\.])+@([a-zA-Z])+(\\.([a-zA-Z])+)+";
    File diretorio    =   new File("DiretorioCriado");
    File textoTxt     =   new File(diretorio, "Emails.txt");
    File textoTxt2    =   new File(diretorio, "EmailsCopiados.txt");
    Pattern pattern   =   Pattern.compile(regex);
    diretorio.mkdir();
    diretorio = new File("DiretorioCriado\\Emails.txt");
    BufferedWriter bufferedWriter = null;
    BufferedReader bufferedReader = null;
    try{
          bufferedWriter = new BufferedWriter(new FileWriter(diretorio, true));
          bufferedReader = new BufferedReader(new FileReader(diretorio));
          diretorio.createNewFile();
          textoTxt.createNewFile();
          textoTxt2.createNewFile();
          textoTxt2.delete();
          textoTxt2.createNewFile();
          String emailArm = "";
          do {
            System.out.println("Digite um email ou '0' para sair: ");
            emailArm = scan.nextLine();
            if(!(emailArm.equals("0"))){
              bufferedWriter.write(emailArm + " ");
              bufferedWriter.newLine();
              bufferedWriter.flush();
            }
          }while(!(emailArm.equals("0")));
          char[] input = new char[500];
          bufferedReader.read(input);
          String texto = "";
          System.out.println("-----------------------------------------------");
          for(char caracteresLidos : input) {
            texto += String.valueOf(caracteresLidos);
          }
          Matcher matcher = pattern.matcher(texto);
          while(matcher.find()) {
             System.out.println(matcher.start() + " - " + matcher.group());
          }
          System.out.println("-----------------------------------------------");
          System.out.println("Deseja remover algum email (S|N)? ");
          char respostaRemover = ' ';
          while(respostaRemover != 's' && respostaRemover != 'n'){
            respostaRemover = scan.next().charAt(0);
            if(respostaRemover == 'n') return;
          }
          b = true;
          respostaRemover = Character.toUpperCase(respostaRemover);
          System.out.println("Numero do email(1..2..)? ");
          int respostaInt = scan.nextInt();
          String textoCopiado = " ";
          String str = " ";
          matcher = pattern.matcher(texto);
          int i = 0;
          while(matcher.find()) {
            i++;
            if(i != respostaInt){
             System.out.println(matcher.start() + " - " + matcher.group());
             textoCopiado = matcher.group() + "\n";
             try(BufferedWriter bw = new BufferedWriter(new FileWriter(textoTxt2, true));
                 BufferedReader br = new BufferedReader(new FileReader(textoTxt2))){
                 bw.write(textoCopiado);
                 bw.newLine();
                 bw.flush();
             }catch(IOException e){
               e.printStackTrace();
             }
            }
          }
    }catch(IOException e) {
      e.printStackTrace();
      throw new IOException("(!)Atencao, erro na classe File. :()");
    }

  }

}