/*
  Forum: https://forum.arduino.cc/t/verbesserungsvorschlage-code/1409208/50
  Wokwi: https://wokwi.com/projects/445367771608793089

  Diverse Möglichkeiten zur Auswertung von Buttons mit Debouncing

    pressed()
    released()
    changed()

  Zudem Auswertung mittels selbstsprechender Namen oder mittels Range Based For Loop

  2025/10/20
  ec2021

*/



constexpr byte btnPressed {LOW};
constexpr byte EinPin {2};
constexpr byte ResetPin {3};
constexpr byte OkPin {4};
constexpr byte WeiterPin {5};
constexpr unsigned long debounceTime {30};

enum btStates {UNCHANGED, RELEASED, PRESSED};

class buttonClass {
  private:
    const uint8_t pin;
    const char* name;
    unsigned long pressTime = 0;
    byte lastState = !btnPressed;
    byte state = !btnPressed;
  public:
    buttonClass(byte aPin, const char aName[]) : pin(aPin), name(aName) {};
    void init() {
      pinMode(pin, INPUT_PULLUP);
    };
    char* buttonName() {
      return name;
    };
    boolean pressed();
    boolean released();
    btStates changed();

};

boolean buttonClass::pressed() {
  byte actState = digitalRead(pin);
  if (lastState != actState) {
    lastState = actState;
    pressTime = millis();
  }
  if (state != lastState && millis() - pressTime > debounceTime) {
    state = lastState;
    return !state;
  }
  return false;
}

boolean buttonClass::released() {
  byte actState = digitalRead(pin);
  if (lastState != actState) {
    lastState = actState;
    pressTime = millis();
  }
  if (state != lastState && millis() - pressTime > debounceTime) {
    state = lastState;
    return state;
  }
  return false;
}

btStates buttonClass::changed() {
  byte actState = digitalRead(pin);
  if (lastState != actState) {
    lastState = actState;
    pressTime = millis();
  }
  if (state != lastState && millis() - pressTime > debounceTime) {
    state = lastState;
    return state ? RELEASED : PRESSED;
  }
  return UNCHANGED;
}


buttonClass ein {EinPin, "Ein"};
buttonClass res {ResetPin, "Reset"};
buttonClass ok {OkPin, "Ok"};
buttonClass next {WeiterPin, "Weiter"};

buttonClass btns[] {ein, res, ok, next};

void initAllBtns() {
  for (auto &b : btns) {
    b.init();
  }
}

void checkBtnPressByRangeBasedFor() {
  for (auto &b : btns) {
    if (b.pressed()) {
      Serial.print(b.buttonName());
      Serial.println(" pressed");
    };
  }
}

void checkBtnReleaseByRangeBasedFor() {
  for (auto &b : btns) {
    if (b.released()) {
      Serial.print(b.buttonName());
      Serial.println(" released");
    };
  }
}


void checkBtnChangedByRangeBasedFor() {
  for (auto &b : btns) {
    btStates btState = b.changed();
    if (btState != UNCHANGED) {
      Serial.print(b.buttonName());
      Serial.println(btState == RELEASED ? " released" : " pressed");
    };
  }
}

void checkBtnPressByName() {
  if (ein.pressed()) {
    Serial.println("Ein betätigt!");
  }
  if (res.pressed()) {
    Serial.println("Reset betätigt!");
  }
  if (ok.pressed()) {
    Serial.println("Ok betätigt!");
  }
  if (next.pressed()) {
    Serial.println("Weiter betätigt!");
  }
}

void setup() {
  Serial.begin(115200);
  initAllBtns();
}

byte mode = 2;

void loop() {
  switch (mode) {
    case 0:
      checkBtnPressByRangeBasedFor();
      break;
    case 1:
      checkBtnReleaseByRangeBasedFor();
      break;
    case 2:
      checkBtnChangedByRangeBasedFor();
      break;
    case 3:
      checkBtnPressByName();
      break;
  }
}