#include <U8g2lib.h>
#include <RotaryEncoder.h>

#define OLED_RESET 4
#define encoderCLK A2
#define encoderDT A3
#define encoderSW 7

U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, SCL, SDA, U8X8_PIN_NONE);

RotaryEncoder encoder(encoderDT, encoderCLK);
int selectedOption = 0;
int prevSelectedOption = -1;

// MENU OPTION
const char *menuItems[] = {
  "Option 1",
  "Option 2",
  "Option 3",
  "Option 4",
  "Option 5",
  "Language/Idioma"
};

int menuSize = sizeof(menuItems) / sizeof(menuItems[0]);

void setup() {
  Serial.begin(9600);
  pinMode(encoderSW, INPUT_PULLUP);
  u8g2.begin();
  u8g2.enableUTF8Print();
  u8g2.setFont(u8g2_font_courB12_tr);
  u8g2.setFontMode(0);
}

void loop() {
  encoder.tick();
  int encoderPos = encoder.getPosition();

  handleEncoder(encoderPos);

  if (digitalRead(encoderSW) == LOW) {
    handleSelection();
    delay(300);  // Debounce
  }

  if (selectedOption != prevSelectedOption) {
    prevSelectedOption = selectedOption;
    displayMenu();
  }
}

void handleEncoder(int encoderPos) {
  int newPosition = encoderPos;

  if (newPosition != selectedOption) {
    if (newPosition >= menuSize) {
      selectedOption = 0;
      newPosition = menuSize - 1;
    } else if (newPosition < 0) {
      selectedOption = menuSize - 1;
    } else {
      selectedOption = newPosition;
    }
  }
}

void handleSelection() {
  Serial.print("Selected Option: ");
  Serial.println(menuItems[selectedOption]);
  Serial.println(selectedOption);
}

void displayMenu() {
  //u8g2.clearDisplay();
  u8g2.firstPage();

  int y = 16; // Posición vertical inicial
  int displayStart = selectedOption;

  if (displayStart > 3) {
    displayStart = 3;
  }

  for (int i = displayStart; i < displayStart + 4; i++) {
    u8g2.setCursor(2, y);
    if (i == selectedOption) {
      u8g2.print(">");
    } else {
      u8g2.print(" ");
    }
    u8g2.print(menuItems[i]);
    y += u8g2.getFontAscent() - u8g2.getFontDescent() + 2; // Calcula el desplazamiento vertical
   
  }

  do {
  } while (u8g2.nextPage());
}