#include <Bounce2.h>

#define PIN_MODE INPUT_PULLUP
#define INTERVAL_IN_MS 10
#define TIMEOUT 2500

#define LED_RED 10
#define LED_YEL 9
#define LED_GRE 8

Bounce2::Button BTN_YEL = Bounce2::Button();
Bounce2::Button BTN_BLU = Bounce2::Button();
Bounce2::Button BTN_GRE = Bounce2::Button();

int z = 0; 
unsigned long last = millis(); 


void setup() {
  // put your setup code here, to run once:

  BTN_GRE.attach(7, PIN_MODE); 
  BTN_GRE.interval(INTERVAL_IN_MS);
  BTN_GRE.setPressedState (LOW);

  BTN_BLU.attach(6, PIN_MODE); 
  BTN_BLU.interval(INTERVAL_IN_MS);
  BTN_BLU.setPressedState (LOW);

  BTN_YEL.attach(5, PIN_MODE); 
  BTN_YEL.interval(INTERVAL_IN_MS);
  BTN_YEL.setPressedState (LOW);




}

void loop() {
  // put your main code here, to run repeatedly:

  BTN_GRE.update(); 
  BTN_BLU.update(); 
  BTN_YEL.update(); 


  
 switch(z)
    {
      case 0: 
      {
        digitalWrite(LED_RED, HIGH);
        if (BTN_GRE.pressed())
        {
          z = 1;
          last = millis();
        }
        break;
      }


      case 1:
        { 
          digitalWrite(LED_RED, LOW);
          digitalWrite(LED_YEL, HIGH);

          if (BTN_YEL.pressed())
          {
            z = 2;
            last = millis();
          }
          if (BTN_BLU.pressed())
          {
            z = -1;
            last = millis();
          }
          if (millis() - last > TIMEOUT)
          {
            z = 0;
          }
          break;
        }

      case 2:
      {
        if (BTN_BLU.pressed())
        {
          z = 3;
          last = millis();
        }
        if (BTN_YEL.pressed())
        {
          z = -1;
          last = millis();
        }
        if (millis() - last > TIMEOUT)
        {
          z = 0;
        }
        break;
      } 

      case 3:
      {
        if (BTN_BLU.pressed())
        {
          z = 4;
          last = millis();
        } 
        if (BTN_YEL.pressed())
        {
          z = -1;
          last = millis();
        }
        if (millis() - last > TIMEOUT)
        {
          z = 0;
        }
        break;
      }

      case 4:
      {
        if (BTN_YEL.pressed())
        {
          z = 5;
          last = millis();
        }
        if (BTN_BLU.pressed())
        {
          z = -1;
          last = millis();
        }
        if (millis() - last > TIMEOUT)
        {
          z = 0;
        }
        break;
      }

      case 5:
      {
        if (BTN_BLU.pressed())
        {
          z = 6;
          last = millis();
        }
        if (BTN_YEL.pressed())
        {
          z = -1;
          last = millis();
        }
        if (millis() - last > TIMEOUT)
        {
          z = 0;
        }
        break;
      }

      case 6:
      {
        if (BTN_GRE.pressed())
        {
          z = 7;
        }
        if (BTN_BLU.pressed() || BTN_YEL.pressed())
        {
          z = -1;
          last = millis();
        }
        if (millis() - last > TIMEOUT)
        {
          z = 0;
        }
        break;
      }

      case 7:
      {
        digitalWrite(LED_YEL, LOW);
        digitalWrite(LED_GRE, HIGH);
        if (BTN_GRE.pressed())
        {
          z = 0;
        }
        break;
      }
  }
}