// for sensor
#include <OneWire.h>
#include <DallasTemperature.h>
#define ONE_WIRE_BUS 4
// Setup a oneWire instance to communicate with any OneWire devices
OneWire oneWire(ONE_WIRE_BUS);

// Pass our oneWire reference to Dallas Temperature sensor 
DallasTemperature sensors(&oneWire);

// for the display
#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)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

// Other global variables
bool fillCircle = false;

// Draw a small circle, change between emtpy and full to indicate that there is an update on the display and not stock
void drawCircle() {
  if(fillCircle){
    display.fillCircle(5, 5, 5, WHITE);
    fillCircle = !fillCircle;
  } else {
    display.drawCircle(5, 5, 5, WHITE);
    fillCircle = !fillCircle;
  }

}

// small function to write text on the display with option for changing font
void textToDisplay(char* text = "default", int fontSize = 1) {
  display.clearDisplay();
  drawCircle();
  display.setTextSize(fontSize);
  display.setTextColor(WHITE);
  display.setCursor(20, 0);
  // Display static text
  display.println(text);
  display.display(); 
}


void setup() {
  Serial.begin(9600);

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  // Start up the library
  sensors.begin();
  textToDisplay("Finished setup...");
  delay(1000);

}

void loop() {
  // Call sensors.requestTemperatures() to issue a global temperature and Requests to all devices on the bus
  sensors.requestTemperatures(); 
  float temp = sensors.getTempCByIndex(0);
  String message = String(temp) + " C";  // Convert float to String, then concatenate
  textToDisplay(message.c_str(),2);
  Serial.println(message.c_str());
  delay(1000);
}