#include <Wire.h>
#include <RTClib.h>

RTC_DS1307 rtc;

const int trigPin = 2;
const int echoPin = 3;
const int buttonPin = 4;
const int buzzerPin = 5;
const int NIGHT_START_HOUR = 22; // Night mode starts at 10:00 PM (24-hour format)
const int NIGHT_END_HOUR = 7;    // Night mode ends at 7:00 AM (24-hour format)
const int DISTANCE_THRESHOLD = 5; // Threshold distance in meters

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(buzzerPin, OUTPUT);

  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }

  // Set the initial date and time (11:05 AM, 04/11/2023)
  if (!rtc.isrunning()) {
    rtc.adjust(DateTime(2023, 11, 4, 11, 5, 0)); // Year, Month, Day, Hour, Minute, Second
  }
}

void loop() {
  DateTime now = rtc.now();

  // Check if it's nighttime (between 10:00 PM and 7:00 AM)
  if (now.hour() >= NIGHT_START_HOUR || now.hour() < NIGHT_END_HOUR) {
    // Check for motion (ultrasonic sensor) detection
    digitalWrite(trigPin, LOW);
    delayMicroseconds(2);
    digitalWrite(trigPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(trigPin, LOW);
    int duration = pulseIn(echoPin, HIGH);
    int distance = duration * 0.034 / 2;
    if (distance < DISTANCE_THRESHOLD) {
      // Motion detected within the threshold distance during nighttime, activate alert (buzzer)
      digitalWrite(buzzerPin, HIGH);
      delay(1000);
      digitalWrite(buzzerPin, LOW);
    }

    // Check for manual activation (push button)
    if (digitalRead(buttonPin) == LOW) {
      // Button pressed during nighttime, activate alert (buzzer)
      digitalWrite(buzzerPin, HIGH);
      delay(1000);
      digitalWrite(buzzerPin, LOW);
      delay(1000); // Wait for a moment before allowing another button press
    }
  }

  // Rest of the code for other functionalities
}