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

//define OLED parameters
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
#define SCREEN_ADDRESS 0x3C

Adafruit_SSD1306 display(SCREEN_WIDTH,SCREEN_HEIGHT,&Wire,OLED_RESET);

//buttons
int buttonPin1=17; //active high
int buttonPin2=16; //active low

void setup() {
  //display intialization
  if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }

  display.display();
  delay(1000);

  display.clearDisplay();
  print_line("Hello",0,0,2);
  delay(1000);

  print_line("World!",0,20,2);
  delay(1000);
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  //intialize the digital pins as input
  pinMode(buttonPin1, INPUT);
  pinMode(buttonPin2, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  int buttonState1=digitalRead(buttonPin1);
  int buttonState2=digitalRead(buttonPin2);

  if(buttonState1==HIGH){
    Serial.println("Button is pressed ACTIVE HIGH");
    delay(200); //Debounce
  }

  if(buttonState2==LOW){
    Serial.println("Button is pressed ACTIVE LOW");
    delay(200); //Debounce
  }
   //delay(10); // this speeds up the simulation
}

void print_line(String text, int column,int row, int text_size){
  display.setTextSize(text_size);       // Set text size
  display.setTextColor(SSD1306_WHITE);  // Set text color
  display.setCursor(column,row);     // Set cursor position
  display.println(text);    //Print text
  display.display();    //Update the display
}