#include <Arduino.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <RTClib.h> // Library for DS1307 RTC
#include <WiFi.h>
#include <HTTPClient.h>

// Pin definitions
const int pirPin = 14;      // PIR sensor connected to GPIO 14
const int buzzerPin = 15;   // Buzzer connected to GPIO 15
const int ledPin = 4;       // LED connected to GPIO 4

// I2C address of the LCD
const int i2cAddress = 0x27; // Change this according to your LCD address

// ThingSpeak parameters
const char *ssid = "Wokwi-GUEST";
const char *password = "";
const String channelID = "GZCK9W91Z0STRAVC"; // Replace with your ThingSpeak channel ID
const char *server = "api.thingspeak.com";

// Set the LCD dimensions (16 columns and 2 rows)
LiquidCrystal_I2C lcd(i2cAddress, 16, 2);

// Define RTC object
RTC_DS1307 rtc;

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

  pinMode(pirPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(ledPin, OUTPUT);

  digitalWrite(buzzerPin, LOW);
  digitalWrite(ledPin, LOW);

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

  // Initialize RTC
  Wire.begin(); // Initialize I2C communication
  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }
  if (!rtc.isrunning()) {
    Serial.println("RTC is not running!");
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }

  // Connect to WiFi
  connectToWiFi();
}

void loop() {
  // Read motion sensor
  int motionState = digitalRead(pirPin);

  // Check motion
  if (motionState == HIGH) {
    Serial.println("Motion detected!");
    digitalWrite(buzzerPin, HIGH);

    // Display "Motion Detected!" along with the current time
    DateTime now = rtc.now();
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Motion Detected!");
    lcd.setCursor(0, 1);
    lcd.print("Time:");
    lcd.print(now.timestamp(DateTime::TIMESTAMP_TIME));

    // Send data to ThingSpeak with value "1"
    sendToThingSpeak(1);

    delay(1000);

    digitalWrite(buzzerPin, LOW);
    delay(5000);
  } else {
    // Display current time on LCD when no motion detected
    DateTime now = rtc.now();
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Time:");
    lcd.setCursor(0, 1);
    lcd.print(now.timestamp(DateTime::TIMESTAMP_TIME));

    // Control LED based on time
    int hour = now.hour();
    if (hour >= 18 || hour < 6) {
      digitalWrite(ledPin, HIGH); // Turn on LED at night (6 PM to 6 AM)
    } else {
      digitalWrite(ledPin, LOW);
    }

    // Send data to ThingSpeak with value "0"
    sendToThingSpeak(0);

    delay(1000); // Delay for a second
  }
}

void connectToWiFi() {
  Serial.println("Connecting to WiFi...");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("...");
  }
  Serial.println("WiFi connected");
}

void sendToThingSpeak(int value) {
  WiFiClient client;
  HTTPClient http;

  // Construct URL with data to send
  String url = "/update?api_key=";
  url += channelID;
  url += "&field1=";
  url += value;

  Serial.print("Sending data to ThingSpeak: ");
  Serial.println(url);

  // Make HTTP GET request
  if (http.begin(client, server, 80, url)) {
    int httpResponseCode = http.GET();
    if (httpResponseCode == 200) {
      Serial.println("Data sent successfully");
    } else {
      Serial.print("Error sending data to ThingSpeak. HTTP response code: ");
      Serial.println(httpResponseCode);
    }
    http.end();
  } else {
    Serial.println("Unable to connect to ThingSpeak");
  }
}