char money[5] = "";
char PIN[5]="";


//take care of some special events
void keypadEvent(byte key){

  byte barra, barra_old;
  boolean flag_break = 0;

  unsigned long currentMillis = millis();
  unsigned long previousMillis = currentMillis;

  //Serial.flush();  ya no funciona en Arduino UNO
  while(Serial.available()>0) Serial.read();

  switch (customKeypad.getState()){
  case PRESSED:
    switch (key){
    case 'A':  
      lcd.clear();
      lcd.print("INIT RFID");
      lcd.setCursor(0, 1);

      while(currentMillis - previousMillis < 5000)
      {
        currentMillis = millis();
        barra = ((currentMillis - previousMillis)*17)/5000;

        if(barra != barra_old)
        {
          barra_progreso(barra);
          barra_old = barra;
        }
        
        if( rfid_read() )
        {
          if(keypadPIN())
          {
            httpCall( 1, 0 );
            //httpRequest( 1, 0);  // operacio = INIT, money = 0
            //delay(4000); // espero para salir del while
          }
        }

      }

      lcdInit();

      break;
    case 'B': 
      lcd.clear();
      lcd.print("BAJA RFID");
      while(currentMillis - previousMillis < 5000)
      {
        currentMillis = millis();
        barra = ((currentMillis - previousMillis)*17)/5000;

        if(barra != barra_old)
        {
          barra_progreso(barra);
          barra_old = barra;
        }

        if( rfid_read() )
        {
          if(keypadPIN())
          {
            httpCall( 2, 0 );
            //httpRequest( 2, 0);  // operacio = INIT, money = 0
            //delay(4000); // espero para salir del while
          }
        }

      }
      
      lcdInit();
      
      break;
    case 'C':  
      lcd.clear();
      lcd.print("COBRO RFID");
      while(currentMillis - previousMillis < 5000)
      {
        currentMillis = millis();
        barra = ((currentMillis - previousMillis)*17)/5000;

        if(barra != barra_old)
        {
          barra_progreso(barra);
          barra_old = barra;
        }

        if( rfid_read() )
        {
          if(keypadPIN())
          {
            if(keypadMoney())
            {
              httpCall( 4, money );
              //httpRequest( 4, money);  // operacio = INIT, money = 0
              //delay(4000); // espero para salir del while
            }
          }
        }

      }

      lcdInit();

      break;
    case 'D':  
      lcd.clear();
      lcd.print("DESCUENTO RFID");
      lcd.setCursor(0, 1);
      while(currentMillis - previousMillis < 5000)
      {
        currentMillis = millis();
        barra = ((currentMillis - previousMillis)*17)/5000;

        if(barra != barra_old)
        {
          barra_progreso(barra);
          barra_old = barra;
        }

        if( rfid_read() )
        {        
          if(keypadPIN()) // si captura de pin es correcta!
          {
            if(keypadMoney())
            {
              httpCall( 3, money );
              //httpRequest( 3, money);  // operacio = INIT, money = 0
              //delay(4000); // espero para salir del while
            }
          }
        }
      }
      
      lcdInit();

      break;

    case '*': 
      lcd.clear();
      lcd.print("SALDO RFID");
      lcd.setCursor(0, 1);
      while(currentMillis - previousMillis < 5000)
      {
        currentMillis = millis();
        barra = ((currentMillis - previousMillis)*17)/5000;

        if(barra != barra_old)
        {
          barra_progreso(barra);
          barra_old = barra;
        }
        
        if( rfid_read() )
        {
          if(keypadPIN())
          {
            httpCall( 5, 0 );
          }
        }
      }

      lcdInit();
      
      break;
    }

    //break;
    
  }
}



void barra_progreso(int progreso)
{

  Serial.print(progreso);
  Serial.print(" ");
  if(progreso <= 16)
  {
    lcd.setCursor(progreso-1,1);
    lcd.write(255);
  }

}




boolean keypadMoney(){ 

  byte i = 0;
  boolean scape = true;
  unsigned long currentMillis = millis();
  unsigned long previousMillis = currentMillis;

  Serial.println("------------------------------");
  Serial.println("Enter MONEY");
  lcd.clear();
  lcd.print("Enter Quantity:");
  lcd.setCursor(0,1);

  while ( (currentMillis - previousMillis < 30000) && scape ) // or '#' or pulsadas 4 teclas
  {
    currentMillis = millis();
    char customKey = customKeypad.getKey();

    if (customKey != NO_KEY) {
      //Serial.println(key);

      switch (customKeypad.getState())
      {
      case PRESSED:
        // añadimos numeros al array
        if(customKey == '#')
        {
          money[i] = '\0';
          scape = false;
        }
        else
        {
          money[i] = customKey;
          Serial.print(money[i]);
          lcd.write(money[i]);

          if(i>=3)
            scape = false;
          else
            i++;
        }  

        break;
      case RELEASED:
        break;
      case HOLD:
        break;
      }

    }
  }

  if(!scape)
  {
    Serial.println();
    Serial.println("------------------------------");
    Serial.print("Money captured: ");
    Serial.println(money);
    return(true);
  }
  else
  {
    Serial.println();
    Serial.println("------------------------------");
    Serial.println("TIME OUT");
    return(false);
  }

}


boolean keypadPIN(){ // FUNCION PIN

  byte i = 0;
  boolean scape = true;
  unsigned long currentMillis = millis();
  unsigned long previousMillis = currentMillis;

  Serial.println("------------------------------");
  Serial.println("Enter PIN");
  lcd.clear();
  lcd.print("Enter PIN:");
  lcd.setCursor(0,1);

  while ( (currentMillis - previousMillis < 30000) && scape )
  {
    currentMillis = millis();
    char customKey = customKeypad.getKey();

    if (customKey != NO_KEY)
    {
      //Serial.println(customKey);

      switch (customKeypad.getState())
      {
      case PRESSED:

        // añadimos numeros al array
        PIN[i] = customKey;
        Serial.print(PIN[i]);
        lcd.write(PIN[i]);

        if(i>=3)
          scape = false;
        else
          i++;

        break;
      case RELEASED:
        break;
      case HOLD:
        break;
      }

    }

  }

  if(!scape)
  {
    Serial.println();
    Serial.println("------------------------------");
    Serial.print("PIN captured: ");
    Serial.println(PIN);
    return(true);
  }
  else
  {
    Serial.println();
    Serial.println("------------------------------");
    Serial.println("TIME OUT");
    return(false);
  }

}