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

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

#define PLUS_BUTTON_PIN 3
#define MINUS_BUTTON_PIN 2
#define OK_BUTTON_PIN 4

#define minWats 5
#define maxWats 65

int currentWats = 60;

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() {
  //setup display
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  displayLogo();
  //setup buttons
  pinMode(PLUS_BUTTON_PIN, INPUT_PULLUP);
  pinMode(MINUS_BUTTON_PIN, INPUT_PULLUP);
  pinMode(OK_BUTTON_PIN, INPUT_PULLUP);
  //set variables
  
}

void displayLogo(){
  display.clearDisplay();
  display.setCursor(43, 28);
  display.setTextColor(WHITE);
  display.setTextSize(1);
  display.print("nebulab");
  display.display();
  delay(1000);
}

void loop() {
  int buttonStatePlus = digitalRead(PLUS_BUTTON_PIN);
  int buttonStateMinus = digitalRead(MINUS_BUTTON_PIN);
  int buttonStateOK = digitalRead(OK_BUTTON_PIN);

  if (buttonStateMinus == HIGH && buttonStatePlus == LOW) {
    if(currentWats > minWats){
      currentWats --;
    }
  }
  else if (buttonStateMinus == LOW && buttonStatePlus == HIGH) {
    if(currentWats < maxWats){
      currentWats ++;
    }
  }
  menu();
}

void menu(){
  display.clearDisplay();//clear display

  display.setCursor(4, 4);
  display.setTextColor(WHITE);
  display.setTextSize(1);
  display.print(currentWats);
  display.print("W");

  display.display();//show on display
}