#define BLYNK_TEMPLATE_ID "TMPL2otFL4awh"           
#define BLYNK_TEMPLATE_NAME "iot assignment"
#define BLYNK_AUTH_TOKEN "J5ftGHmkGZt9BVwV_nDe6f3uXknlw8Gf"
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <DHT.h>

// Pin Definitions
#define DHTPIN 4            // DHT22 Data Pin
#define DHTTYPE DHT22       // DHT sensor type
#define LDRPIN 34           // LDR Analog Pin
#define LEDPIN 16           // LED Pin

// Blynk Auth Token
char auth[] = "J5ftGHmkGZt9BVwV_nDe6f3uXknlw8Gf";    // Replace with your Blynk authentication token

// Wi-Fi Credentials (Using Wokwi-GUEST)
char ssid[] = "Wokwi-GUEST";  // Open access point
char pass[] = "";             // No password

// DHT Sensor
DHT dht(DHTPIN, DHTTYPE);
bool temperatureEnabled = true;  // Default state for temperature switch

// Blynk Virtual Pins
#define TEMP_DISPLAY V8
#define TEMP_SWITCH V1
#define ALARM_SOUND V2
#define TIME_OF_DAY V6
#define LIGHT_DISPLAY V4

BLYNK_WRITE(TEMP_SWITCH) {
  int switchState = param.asInt();
  temperatureEnabled = (switchState == 1);
  Serial.println(temperatureEnabled ? "Temperature Reading: ENABLED" : "Temperature Reading: DISABLED");
}

void sendTemperatureToBlynk() {
  if (temperatureEnabled) {
    float temp = dht.readTemperature();
    if (!isnan(temp)) {
      Blynk.virtualWrite(TEMP_DISPLAY, temp);
      Serial.print("Temperature: ");
      Serial.println(temp);
      checkTemperatureAlarm(temp);
    } else {
      Serial.println("Error reading temperature!");
    }
  }
}

void checkTemperatureAlarm(float temp) {
  if (temp < 10 || temp > 50) {
    Blynk.virtualWrite(ALARM_SOUND, 1);
    Serial.println("ALARM: Temperature out of range!");
  } else {
    Blynk.virtualWrite(ALARM_SOUND, 0);
  }
}

void handleLDR() {
  int ldrValue = analogRead(LDRPIN);
  String timeOfDay;

  if (ldrValue < 200) {
    timeOfDay = "Morning";
    digitalWrite(LEDPIN, LOW);
    Blynk.virtualWrite(LIGHT_DISPLAY, 0);
  } else if (ldrValue < 700) {
    timeOfDay = "Afternoon";
    digitalWrite(LEDPIN, HIGH);
    Blynk.virtualWrite(LIGHT_DISPLAY, 1);
  } else {
    timeOfDay = "Night";
    digitalWrite(LEDPIN, HIGH);
    Blynk.virtualWrite(LIGHT_DISPLAY, 1);
  }

  Blynk.virtualWrite(TIME_OF_DAY, timeOfDay);

  Serial.print("LDR Value: ");
  Serial.print(ldrValue);
  Serial.print(" | Time of Day: ");
  Serial.println(timeOfDay);
}

void setup() {
  Serial.begin(9600);
  Serial.print("Connecting to WiFi");

  WiFi.begin("Wokwi-GUEST", "");  // Connect to Wokwi-GUEST network
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println(" Connected!");

  dht.begin();  // Initialize DHT sensor
  Blynk.config(auth);  // Initialize Blynk without blocking
  pinMode(LEDPIN, OUTPUT);
  digitalWrite(LEDPIN, LOW);
  Serial.println("System Initialized...");
}

void loop() {
  Blynk.run();
  sendTemperatureToBlynk();
  handleLDR();
  delay(1000);  // 1-second delay
}