#include <Adafruit_MPU6050.h>
#include <Adafruit_Sensor.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h>
#include <DHT.h>

#define DHTPIN 7
#define DHTTYPE DHT22

const int buzzerPin = 5;
const float threshold = 0.5;
const int pirPin = 8;
int pirState = LOW;
int servoPin = 9;
Servo myservo;

Adafruit_MPU6050 mpu;
LiquidCrystal_I2C lcd(0x27, 20, 4);
DHT dht(DHTPIN, DHTTYPE);

sensors_event_t event;
float ax_prev, ay_prev;
bool earthquakeDetected = false;
float temperature, humidity, dewPoint, heatIndex;
const unsigned long earthquakeAlertDuration = 5000;
unsigned long startTime;  // Declare startTime at a higher scope

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

  lcd.init();
  lcd.backlight();

  while (!mpu.begin()) {
    delay(1000);
  }
  mpu.setAccelerometerRange(MPU6050_RANGE_8_G);

  myservo.attach(servoPin);
  myservo.write(90);

  dht.begin();

  pinMode(buzzerPin, OUTPUT);
  pinMode(pirPin, INPUT);
  ax_prev = 0.0;
  ay_prev = 0.0;
}

void loop() {
  mpu.getAccelerometerSensor()->getEvent(&event);
  pirState = digitalRead(pirPin);

  temperature = dht.readTemperature();
  humidity = dht.readHumidity();
  
  // Calculate dew point using a separate function (you need to implement this)
  dewPoint = calculateDewPoint(temperature, humidity);

  heatIndex = dht.computeHeatIndex(temperature, humidity, false);

  if (!earthquakeDetected && (
      abs(event.acceleration.x - ax_prev) > threshold ||
      abs(event.acceleration.y - ay_prev) > threshold )) {
    earthquakeDetected = true;

    digitalWrite(buzzerPin, HIGH);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("*** EARTHQUAKE! ***");
    lcd.setCursor(0, 1);
    lcd.print("Seek safe shelter!");

    startTime = millis();

    while (millis() - startTime < earthquakeAlertDuration) {
    }
  }

  if (pirState == HIGH) {
    myservo.write(0);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("** Animal on road! **");
    lcd.setCursor(0, 1);
    lcd.print("Roads closed!");
    delay(5000);
  } else if (pirState == LOW && !earthquakeDetected) {
    myservo.write(90);
    delay(5000);
  }
  lcd.clear();
  lcd.setCursor(0, 1);
  lcd.print("Temp:");
  lcd.setCursor(6, 1);
  lcd.print(temperature);
  lcd.print(" C");

  lcd.setCursor(1, 3);
  lcd.print("Humid:");
  lcd.setCursor(7, 3);
  lcd.print(humidity);
  lcd.print("%");
  ax_prev = event.acceleration.x;
  ay_prev = event.acceleration.y;

  if (earthquakeDetected && (millis() - startTime >= earthquakeAlertDuration)) {
    earthquakeDetected = false;
    digitalWrite(buzzerPin, LOW);

  }

  delay(500);
}

float calculateDewPoint(float temperature, float humidity) {
  return 0;
}