#include <DHT.h>

#define DHTPIN 4         // DHT22 data pin connected to GPIO 4
#define DHTTYPE DHT22    // DHT 22 (AM2302)
#define BUZZER_PIN 18    // Buzzer connected to GPIO 18
#define BUTTON_PIN 27    // Pushbutton connected to GPIO 27

DHT dht(DHTPIN, DHTTYPE);

// Thresholds for emergency (similar to ML model but simplified)
#define CRITICAL_HEART_RATE 100   // Above 100 bpm is critical
#define CRITICAL_TEMP 38.0        // Above 38°C is critical

void setup() {
  Serial.begin(115200);
  pinMode(BUTTON_PIN, INPUT_PULLUP);  // Button pin as input with pull-up
  pinMode(BUZZER_PIN, OUTPUT);        // Buzzer pin as output
  dht.begin();  // Initialize DHT22 sensor
  Serial.println("System initialized...");
}

void loop() {
  // Check if the button is pressed
  bool buttonPressed = (digitalRead(BUTTON_PIN) == LOW);
  if (buttonPressed) {
    Serial.println("Button pressed, checking conditions...");

    // Collect sensor data
    float temp = dht.readTemperature();
    if (isnan(temp)) {
      Serial.println("Failed to read from DHT22 sensor!");
      return;
    }

    int heartRate = random(60, 130);  // Simulate heart rate data for testing

    // Log data to serial monitor
    Serial.print("Heart Rate: ");
    Serial.println(heartRate);
    Serial.print("Body Temperature: ");
    Serial.println(temp);

    // Decision-making based on thresholds (replacing ML model)
    bool emergency = checkEmergency(heartRate, temp);

    if (emergency) {
      // If it's an emergency, activate buzzer and display warning
      Serial.println("Emergency detected! Activating buzzer...");
      activateEmergencySequence(heartRate, temp);
    } else {
      // If conditions are normal
      Serial.println("I am looking, you are all good.");
    }
  }

  delay(100);
}

bool checkEmergency(int heartRate, float temperature) {
  // Simple threshold-based check
  if (heartRate > CRITICAL_HEART_RATE || temperature > CRITICAL_TEMP) {
    return true;  // It's an emergency
  }
  return false;   // Normal condition
}

void activateEmergencySequence(int heartRate, float temperature) {
  // Activate buzzer and display emergency information
  digitalWrite(BUZZER_PIN, HIGH);
  delay(10000);  // Activate buzzer for 10 seconds (simulation)
  digitalWrite(BUZZER_PIN, LOW);
  
  // Log the emergency message (simulate notification)
  Serial.println("Emergency Message:");
  Serial.println("Hello user, your family member Mr. Ansh has stucked in an emergency situation..");
  Serial.println("Location: Gota, Ahmedabad");  // Static location for simulation
  Serial.print("Heart rate: ");
  Serial.print(heartRate);
  Serial.println(" bpm");
  Serial.print("Skin temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");
}