//Konstanten
#define BUTTON_ZU 2
#define LED_OBEN 5
#define LED_UNTEN 6
#define BUTTON_AUF 3

#define ZEIT 25

#define STATE_OBEN 1
#define STATE_ZU 2
#define STATE_UNTEN 3
#define STATE_AUF 4
#define STATE_STOP 5



int state = STATE_OBEN;
int counter = ZEIT;

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

  //Pins konfigurieren
  pinMode(BUTTON_ZU, INPUT_PULLUP);
  pinMode(LED_OBEN, OUTPUT);
  pinMode(LED_UNTEN, OUTPUT);
  pinMode(BUTTON_AUF, INPUT_PULLUP);

  Serial.begin(115200);

}



void loop() {

  //Statemachine

  switch (state) {

    case STATE_OBEN:
      Serial.println("Bin im Zustand OBEN");

      digitalWrite(LED_OBEN, HIGH);
      digitalWrite(LED_UNTEN, LOW);


      //Zustandsübergang
      if (digitalRead(BUTTON_ZU) == LOW) {
        state = STATE_ZU;
      }

      break;

    case STATE_STOP:
      Serial.println("Bin im Zustand Stop");
      if (digitalRead(BUTTON_ZU) == LOW) {
        state = STATE_ZU;
      }
      else {
        if (digitalRead(BUTTON_AUF) == LOW) {
          state = STATE_AUF;
        }
      }
      break;


    case STATE_ZU:
      Serial.println("Bin im Zustand ZU");

      if (digitalRead(LED_UNTEN) == HIGH) {
        digitalWrite(LED_UNTEN, LOW);
      }
      else {
        digitalWrite(LED_UNTEN, HIGH);
      }

      digitalWrite(LED_OBEN, LOW);


      //Zustandsübergang

      counter = counter - 1;
      if (counter == 0) {
        state = STATE_UNTEN;
        counter = ZEIT;
      }
      if (digitalRead(BUTTON_ZU) == LOW) {
        state = STATE_STOP;
      }


      break;


    case STATE_UNTEN:
      Serial.println("Bin im Zustand UNTEN");

      digitalWrite(LED_UNTEN, HIGH);
      digitalWrite(LED_OBEN, LOW);

      if (digitalRead(BUTTON_AUF) == LOW) {
        state = STATE_AUF;
      }

      break;



    case STATE_AUF:
      Serial.println("Bin im Zustand AUF");

      digitalWrite(LED_UNTEN, LOW);
      if (digitalRead(LED_OBEN) == HIGH); {
        digitalWrite(LED_OBEN, LOW);
      }
      if (digitalRead(BUTTON_AUF) == LOW) {
        state = STATE_STOP;
      }








      //Zustandsübergang auf Oben
      if (state == STATE_AUF) {
        counter = counter - 1;
        if (counter == 0) {
          state = STATE_OBEN;
          counter = ZEIT;
        }

      }

      break;

  }

  delay(200);


}