#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <OneWire.h>
#include <DallasTemperature.h>

// OLED Display config
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// DS18B20 config
#define ONE_WIRE_BUS 5
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

// Data holders
float tempC = 0;
int bpm = 0;

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

  // OLED init
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println("OLED not found");
    while (true);
  }

  display.clearDisplay();
  display.setTextColor(SSD1306_WHITE);
  display.setTextSize(1);
  display.setCursor(0, 0);
  display.println("PupGuard Starting...");
  display.display();
  delay(2000);

  // Init temp sensor
  sensors.begin();
}

void loop() {
  // Simulate BPM (replace with actual reading if library is updated)
  bpm = random(60, 110);

  // Read temperature
  sensors.requestTemperatures();
  tempC = sensors.getTempCByIndex(0);
  tempC += 3.0; // adjust for DS18B20 offset

  // Print to Serial Monitor
  Serial.print("Heart Rate: ");
  Serial.print(bpm);
  Serial.print(" BPM | Temp: ");
  Serial.print(tempC, 1);
  Serial.println(" °C");

  // Display on OLED
  display.clearDisplay();
  display.setTextSize(1);
  display.setCursor(0, 0);
  display.println("PupGuard Monitor");

  display.setTextSize(2);
  display.setCursor(0, 16);
  display.print("BPM: ");
  display.println(bpm);

  display.setCursor(0, 40);
  display.print("Temp: ");
  display.print(tempC, 1);
  display.println("C");

  display.display();
  delay(2000);
}