#include <Wire.h>
#include <Adafruit_MPU6050.h>
#include <Adafruit_Sensor.h>
#include <OneWire.h>
#include <DallasTemperature.h>

// Pin Definitions
#define DS18B20_PIN 4
#define SOS_BUTTON 15
#define BUZZER 5
#define POTENTIOMETER A0 // Simulating MAX30102

// Sensor Objects
OneWire oneWire(DS18B20_PIN);
DallasTemperature tempSensor(&oneWire);
Adafruit_MPU6050 mpu;

void setup() {
    Serial.begin(115200);
    
    pinMode(SOS_BUTTON, INPUT_PULLUP);  // Changed to PULLUP for stability
    pinMode(BUZZER, OUTPUT);
    pinMode(POTENTIOMETER, INPUT);

    // Initialize DS18B20
    tempSensor.begin();

    // Initialize MPU6050
    if (!mpu.begin()) {
        Serial.println("MPU6050 not detected!");
        while (1);
    }
    Serial.println("MPU6050 initialized.");
}

void loop() {
    // Read simulated heart rate (Potentiometer value as MAX30102 substitute)
    int heartRate = map(analogRead(POTENTIOMETER), 0, 4095, 50, 180); // Scale to BPM range
    Serial.print("Heart Rate: ");
    Serial.print(heartRate);
    Serial.println(" BPM");

    // Read temperature
    tempSensor.requestTemperatures();
    float temperature = tempSensor.getTempCByIndex(0);
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.println(" °C");

    // Read accelerometer data for fall detection
    sensors_event_t a, g, temp;
    mpu.getEvent(&a, &g, &temp);
    float acceleration = sqrt(a.acceleration.x * a.acceleration.x +
                              a.acceleration.y * a.acceleration.y +
                              a.acceleration.z * a.acceleration.z);
    Serial.print("Acceleration: ");
    Serial.println(acceleration);

    // Fall Detection
    if (acceleration < 3.0) { // Adjust threshold as needed
        Serial.println("🚨 Fall Detected!");
        triggerBuzzer(500);
    }

    // Check SOS button
    if (digitalRead(SOS_BUTTON) == LOW) { // LOW means pressed (due to PULLUP)
        Serial.println("🚨 SOS Alert Triggered!");
        triggerBuzzer(1000);
    }

    Serial.println("----------------------");
    delay(1000); // Wait 1 second before next reading
}

// Function to trigger buzzer
void triggerBuzzer(int duration) {
    digitalWrite(BUZZER, HIGH);
    delay(duration);
    digitalWrite(BUZZER, LOW);
}