/*
Titel: State Machine (nahe an Original)
Author: Gregor Mausser
Date: 29.04.2026
*/


const int Led_Up = 3;
const int Led_Down = 2;
const int Button_Up = 11;
const int Button_Down = 8;


unsigned long starttime = 0;
long duration = 0;        
int direction = 0;        

//Überprüfen ob es eine Nummer ist
enum mode {
  Up,
  Drive_Up,
  Down,
  Drive_Down
};

mode state = Up;

//Flankenerkennung
bool lastButtonStateUp = HIGH;
bool lastButtonStateDown = HIGH;


void setup() {
  Serial.begin(9600);

  pinMode(Led_Up, OUTPUT);
  pinMode(Led_Down, OUTPUT);
  pinMode(Button_Up, INPUT_PULLUP);
  pinMode(Button_Down, INPUT_PULLUP);
}

void Flanke_Up() {
  bool readingUp = digitalRead(Button_Up);

  if (readingUp == LOW && lastButtonStateUp == HIGH) {
    state = Drive_Up;
    direction = +1;

    //Startzeit so setzen, dass aktuelle Position erhalten bleibt
    starttime = millis() - duration;

    Serial.println("Drive Up");
  }

  lastButtonStateUp = readingUp;
}


void Flanke_Down() {
  bool readingDown = digitalRead(Button_Down);

  if (readingDown == LOW && lastButtonStateDown == HIGH) {
    state = Drive_Down;
    direction = -1;

    // wichtig: gleiche Logik!
    starttime = millis() - duration;

    Serial.println("Drive Down");
  }

  lastButtonStateDown = readingDown;
}


void Time() {

  unsigned long Position = millis();

  //Wie lange sich die Rollo bewegt berechnen
  long unterschied = Position - starttime;

  if (direction == +1) {
    duration = unterschied;           //hochzählen
  } 
  else if (direction == -1) {
    duration = 5000 - unterschied;    //runterzählen
  }

  Serial.print("Dauer: ");
  Serial.println(duration);

  // Grenzen prüfen
  if (duration >= 5000) {
    duration = 5000;
    state = Up;
    Serial.println("Oben erreicht");
  }

  if (duration <= 0) {
    duration = 0;
    state = Down;
    Serial.println("Unten erreicht");
  }
}

void loop() {

  Flanke_Up();
  Flanke_Down();

  switch (state) {

    case Up:
      digitalWrite(Led_Up, HIGH);
      digitalWrite(Led_Down, LOW);
      break;

    case Down:
      digitalWrite(Led_Up, LOW);
      digitalWrite(Led_Down, HIGH);
      break;

    case Drive_Up:
    case Drive_Down:
      digitalWrite(Led_Up, LOW);
      digitalWrite(Led_Down, LOW);
      Time();   
      break;
  }
}