#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);


void draw_menu(int selected_option) {
  display.clearDisplay();
  display.setCursor(0,0);
  display.setTextColor(BLACK, WHITE);
  display.println("------- Menu --------\n");
  display.setTextColor(WHITE);

  if (selected_option == 0) {
    display.setTextColor(BLACK, WHITE);
  } else {
    display.setTextColor(WHITE);
  }
  display.println("Option 00");

  if (selected_option == 1) {
    display.setTextColor(BLACK, WHITE);
  } else {
    display.setTextColor(WHITE);
  }
  display.println("Option 01");

  if (selected_option == 2) {
    display.setTextColor(BLACK, WHITE);
  } else {
    display.setTextColor(WHITE);
  }
  display.println("Option 02");

  display.display();
}

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

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { 
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }

  display.display();
  delay(500);
}

void loop() {
  int analogValue = analogRead(14);
  int valor = map(analogValue, 0, 4095, 0, 2);
  draw_menu(valor);
}