#define BLYNK_TEMPLATE_ID "TMPL3KdvY3Phx"
#define BLYNK_TEMPLATE_NAME "Test1"
#define BLYNK_AUTH_TOKEN "TkqQq1yVyAOIxiUmLsHT6PdIw1n_Q_gl"


#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <DHT.h>

char ssid[] = "Wokwi-GUEST";
char pass[] = "";

#define PIR_PIN 27
#define RELAY1  26  // PIR + Blynk
#define RELAY2  25  // Blynk only
#define RELAY3  33  // Blynk only
#define RELAY4  32  // Optional
#define BUZZER  14
#define RED_LED 12
#define GREEN_LED 13
#define DHTPIN  4
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);
BlynkTimer timer;

bool pirDetected = false;
bool blynkRelay1 = false;

BLYNK_WRITE(V0) { blynkRelay1 = param.asInt(); }
BLYNK_WRITE(V1) { digitalWrite(RELAY2, param.asInt()); }
BLYNK_WRITE(V2) { digitalWrite(RELAY3, param.asInt()); }

void blinkRedLED() {
  if (!pirDetected) {
    digitalWrite(RED_LED, HIGH);
    delay(300);
    digitalWrite(RED_LED, LOW);
    delay(300);
  }
}

void readSensors() {
  float temp = dht.readTemperature();
  float hum = dht.readHumidity();

  if (isnan(temp) || isnan(hum)) return;

  Blynk.virtualWrite(V3, temp);
  Blynk.virtualWrite(V4, hum);

  if (temp >= 55) {
    digitalWrite(BUZZER, HIGH);
    Blynk.logEvent("temp_alert", "High Temperature Detected!");
  } else {
    digitalWrite(BUZZER, LOW);
  }
}

void checkPIR() {
  pirDetected = digitalRead(PIR_PIN);
  if (pirDetected) {
    digitalWrite(GREEN_LED, HIGH);
    digitalWrite(RELAY1, LOW);  // ON
  } else {
    digitalWrite(GREEN_LED, LOW);
    if (blynkRelay1)
      digitalWrite(RELAY1, LOW);  // ON
    else
      digitalWrite(RELAY1, HIGH); // OFF
  }
}

void setup() {
  Serial.begin(115200);
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
  dht.begin();

  pinMode(PIR_PIN, INPUT);
  pinMode(RELAY1, OUTPUT);
  pinMode(RELAY2, OUTPUT);
  pinMode(RELAY3, OUTPUT);
  pinMode(RELAY4, OUTPUT);
  pinMode(BUZZER, OUTPUT);
  pinMode(RED_LED, OUTPUT);
  pinMode(GREEN_LED, OUTPUT);

  digitalWrite(RELAY1, HIGH);  // All off initially
  digitalWrite(RELAY2, HIGH);
  digitalWrite(RELAY3, HIGH);
  digitalWrite(RELAY4, HIGH);

  timer.setInterval(1000L, readSensors);
  timer.setInterval(500L, checkPIR);
}

void loop() {
  Blynk.run();
  timer.run();
  blinkRedLED(); // only blinks if no motion
}