#include <U8g2lib.h>
#include <Encoder.h>
#include <Bounce2.h>

// Pins für den Rotary Encoder
Encoder myEnc(2, 3);

// Pin für den Push-Button
const int buttonPin = 8;
Bounce2::Button button;
int ButtonPushed = 0;

long oldPosition  = 0;
int _Menue = 1;
const int _MenueSlides = 4;  // Grenze für die Zahl (1-4)
const int stepsPerIncrement = 4; // Anzahl der Encoder-Schritte pro Zähleränderung

// Display-Setup
U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);

void setup() {
  Serial.begin(9600);
  Serial.println("Encoder mit Push-Button Test:");

  // Konfiguration des Push-Buttons
  button.attach(buttonPin, INPUT_PULLUP);
  button.interval(10);  // Entprell-Intervall in Millisekunden

  // Initialisiere die Startposition
  myEnc.write(0);

  // Initialisiere das Display
  u8g2.begin();
  u8g2.enableUTF8Print(); // enable UTF8 support for the Arduino print() function
}

void loop() {
  updateEncoder();
  menuSelection();
  Button ();
  //delay(10); // Vermeidung übermäßiger CPU-Auslastung
}

void Button (){
  // Aktualisiere den Button-Status
  button.update();

  // Überprüfe, ob der Button gedrückt wurde
  if (button.fell()) {
    ButtonPushed = ButtonPushed +1;
    Serial.print("Button: ");
    Serial.println(ButtonPushed);

    if (ButtonPushed == 2)
      ButtonPushed = 0;
    }
  }



void updateEncoder() {
  long newPosition = myEnc.read();
  if ((newPosition - oldPosition) >= stepsPerIncrement || (newPosition - oldPosition) <= -stepsPerIncrement) {
    if (newPosition > oldPosition) {
      _Menue++;
    } else {
      _Menue--;
    }

    // Begrenzung des Zählers zwischen 1 und _MenueSlides
    if (_Menue > _MenueSlides) _Menue = 1;
    if (_Menue < 1) _Menue = _MenueSlides;

    oldPosition = newPosition; // Aktualisiere die alte Position

    Serial.print("Counter: ");
    Serial.println(_Menue);
  }


}

void menuSelection(){             // Auswahl des Menüs
    if (_Menue == 1){
    displayMain1();

    while (ButtonPushed == 1){    // Menü fixieren wenn knopf gedrückt

      u8g2.clearBuffer();          // clear the internal memory
      u8g2.setFont(u8g2_font_ncenB14_tr); // choose a suitable font
      u8g2.setCursor(0, 30);      // position the cursor
      u8g2.print("Button Pushed");          // print the current number
      u8g2.sendBuffer();           // transfer internal memory to the display
      Button ();
    }
  }
  else if (_Menue == 2) {
    displayMain2();
  }
    else if (_Menue == 3) {
    displayMain3();
  }
    else if (_Menue == 4) {
    displayMain4();
  }
}


void displayMain1() {
  u8g2.clearBuffer();          // clear the internal memory
  u8g2.setFont(u8g2_font_ncenB14_tr); // choose a suitable font
  u8g2.setCursor(50, 30);      // position the cursor
  u8g2.print("Menu 1");          // print the current number
  u8g2.sendBuffer();           // transfer internal memory to the display
}

void displayMain2() {
  u8g2.clearBuffer();          // clear the internal memory
  u8g2.setFont(u8g2_font_ncenB14_tr); // choose a suitable font
  u8g2.setCursor(50, 30);      // position the cursor
  u8g2.print("Menu 2");          // print the current number
  u8g2.sendBuffer();           // transfer internal memory to the display
}

void displayMain3() {
  u8g2.clearBuffer();          // clear the internal memory
  u8g2.setFont(u8g2_font_ncenB14_tr); // choose a suitable font
  u8g2.setCursor(50, 30);      // position the cursor
  u8g2.print("Menu 3");          // print the current number
  u8g2.sendBuffer();           // transfer internal memory to the display
}

void displayMain4() {
  u8g2.clearBuffer();          // clear the internal memory
  u8g2.setFont(u8g2_font_ncenB14_tr); // choose a suitable font
  u8g2.setCursor(50, 30);      // position the cursor
  u8g2.print("Menu 4");          // print the current number
  u8g2.sendBuffer();           // transfer internal memory to the display
}

void displayNumber() {
  u8g2.clearBuffer();          // clear the internal memory
  u8g2.setFont(u8g2_font_ncenB14_tr); // choose a suitable font
  u8g2.setCursor(50, 30);      // position the cursor
  u8g2.print(_Menue);          // print the current number
  u8g2.sendBuffer();           // transfer internal memory to the display
}