#include <Bounce2.h>
#define T1 11
#define T2 10
#define B 12
#define R 13
#define GR 9
#define GE 8

Bounce btn1 = Bounce();
Bounce btn2 = Bounce();
int e = 0;
int z = 0;


void setup() 
{
  Serial.begin(9600);
  btn1.attach(T1, INPUT_PULLUP);
  btn2.attach(T2, INPUT_PULLUP);
  btn1.interval(10);
  btn2.interval(10);
  pinMode(R, OUTPUT);
  pinMode(B, OUTPUT);
  pinMode(GR, OUTPUT);
  pinMode(GE, OUTPUT);
}

void eErkennen ()
{
  if (btn1.fell())
  {
    e = 2;
    return;
  }
  if(btn1.rose())
  {
    e = 1;
    return;
  }
  if(btn2.fell())
  {
    e = 4;
    return;
  }
  if(btn2.rose())
  {
    e = 3;
    return;
  }
}

void zustandsUebergang ()
{
  switch(e)
  {
    case 0:
    {
      z = 0;
      break;
    }
    case 1:
    {
      if(z == 1|| z == 2)
      {
        z = 2;
        break;
      }
      if(z == 3 || z == 4)
      {
        z = 4;
        break;
      }
      if(z == 9 || z == 10)
      {
        z = 10;
        break;
      }
      
      if(z == 5 ||z == 6 ||z == 7 ||z == 8)
      {
        z = 11;
      }
      
      break;
    }
    case 2: 
    {
      
      if(z == 0 || z == 1)
      {
        z = 1;
        break;
      }
      if(z == 6 || z == 8)
      {
        z = 8;
        break;
      }
      
      if(z == 2 ||z == 3 ||z == 4 ||z == 5||z == 7||z == 9||z == 10)
      {
        z = 11;
      }
      
      break;
    }
    case 3: 
    {
      if(z == 4|| z == 5)
      {
        z = 5;
        break;
      }
      if(z == 6 || z == 7)
      {
        z = 7;
        break;
      }
      if(z == 8 || z == 9)
      {
        z = 9;
        break;
      }
      if(z == 1 ||z == 2 ||z == 3 ||z == 10)
      {
        z = 11;
      }
      break;
    }
    case 4: 
    {
      if(z == 0|| z == 6)
      {
        z = 6;
        break;
      }
      if(z == 1 || z == 3)
      {
        z = 3;
        break;
      }
      if(z == 2 ||z == 4 ||z == 5 ||z == 7||z == 8||z == 9||z == 10)
      {
        z = 11;
        break;
      }
      break;
    }
  }
}

void zAuswerten ()
{
  if (z == 2)
  {
    digitalWrite(R, HIGH);
    //digitalWrite(B, LOW);
    //digitalWrite(GR, LOW);
    //digitalWrite(GE, LOW);
    z = 0;
  }
  if (z == 5)
  {
    //digitalWrite(R, LOW);
    //digitalWrite(B, LOW);
    digitalWrite(GR, HIGH);
    //digitalWrite(GE, LOW);
    z = 0;
  }
  if (z == 7)
  {
    //digitalWrite(R, LOW);
    //digitalWrite(B, LOW);
    //digitalWrite(GR, LOW);
    digitalWrite(GE, HIGH);
    z = 0;
  }
  if (z == 10)
  {
   // digitalWrite(R, LOW);
    digitalWrite(B, HIGH);
    //digitalWrite(GR, LOW);
    //digitalWrite(GE, LOW);
    z = 0;
  }
  if (z==11)
  {
    digitalWrite(R, LOW);
    digitalWrite(B, LOW);
    digitalWrite(GR, LOW);
    digitalWrite(GE, LOW);
    z = 0;
  }
}

void loop() 
{
  btn1.update();
  btn2.update();
  eErkennen();
  zustandsUebergang();
  zAuswerten();
  if(btn1.fell()|| btn2.fell()||btn1.rose()|| btn2.rose())
  {
    Serial.println(z);
  }
}