#define BLYNK_TEMPLATE_ID "TMPL6aAuMx5E8"
#define BLYNK_TEMPLATE_NAME "testing"
#define BLYNK_AUTH_TOKEN "BiD9QyOD77TRQoasS_mQ_FK_qkcUNUOu"

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

#define TRIG_PIN 32
#define ECHO_PIN 34
#define LED_PIN 21
#define LDR_PIN 18  // Define the pin for the LDR sensor
#define PIR_PIN 22  // Define the pin for the PIR motion sensor
#define BUZZER_PIN 25 // Define the pin for the buzzer

char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "huszzz";
char pass[] = "hellokitty";

BlynkTimer timer;
bool isBlynkConnected = false;
bool manualLEDControl = false; // To track manual control state

// Ultrasonic sensor distance measurement
long measureDistance() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  long duration = pulseIn(ECHO_PIN, HIGH);
  float distance = duration * 0.034 / 2;

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  return distance;
}

// Function to play a welcome doorbell melody
void playWelcomeMelody() {
  int melody[] = {262, 294, 330, 262, 330, 349, 392, 294, 349, 392};
  int durations[] = {400, 400, 400, 400, 400, 400, 600, 400, 400, 600};

  for (int i = 0; i < 10; i++) {
    tone(BUZZER_PIN, melody[i], durations[i]);
    delay(durations[i] * 1.5);
  }
  noTone(BUZZER_PIN);
}

// Send ultrasonic sensor data to Blynk
void sendUltrasonicData() {
  long distance = measureDistance();
  if (distance > 0) {
    Blynk.virtualWrite(V1, distance);

    if (distance <= 50) {
      Serial.println("Welcome home!! :)");
      playWelcomeMelody();
    } else {
      noTone(BUZZER_PIN);
      Serial.println("Buzzer OFF: Object out of range or no object.");
    }
  } else {
    Serial.println("Distance measurement failed.");
  }
}

// Blynk write handler for manual LED control
BLYNK_WRITE(V0) {
  int buttonState = param.asInt();
  if (buttonState == 1) {
    manualLEDControl = true;  // Enable manual control
    digitalWrite(LED_PIN, HIGH); // Turn LED ON
    Serial.println("LED ON (Manual)");
  } else {
    manualLEDControl = false; // Disable manual control
    digitalWrite(LED_PIN, LOW); // Turn LED OFF
    Serial.println("LED OFF (Manual)");
  }
}

// Check Wi-Fi and Blynk connection status
void checkConnections() {
  if (WiFi.status() != WL_CONNECTED) {
    Serial.println("Wi-Fi disconnected! Reconnecting...");
    WiFi.begin(ssid, pass);
    while (WiFi.status() != WL_CONNECTED) {
      delay(1000);
      Serial.print(".");
    }
    Serial.println("\nWi-Fi connected!");
  }

  if (!Blynk.connected()) {
    Serial.println("Blynk disconnected! Reconnecting...");
    Blynk.connect();
  }

  if (WiFi.status() == WL_CONNECTED && Blynk.connected()) {
    if (!isBlynkConnected) {
      Serial.println("Wi-Fi and Blynk connected!");
      isBlynkConnected = true;
    }
  } else {
    isBlynkConnected = false;
  }
}

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

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
  pinMode(LDR_PIN, INPUT);
  pinMode(PIR_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);

  Serial.println("Connecting to WiFi...");
  WiFi.begin(ssid, pass);

  int wifiRetries = 0;
  while (WiFi.status() != WL_CONNECTED && wifiRetries < 30) {
    delay(500);
    Serial.print(".");
    wifiRetries++;
  }

  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("\nWiFi Connected");
    Serial.print("IP Address: ");
    Serial.println(WiFi.localIP());
  } else {
    Serial.println("\nWiFi connection failed. Please check your credentials.");
    return;
  }

  Serial.println("Connecting to Blynk...");
  Blynk.begin(auth, ssid, pass, "blynk.cloud", 80);

  if (Blynk.connected()) {
    Serial.println("Blynk Connected");
  } else {
    Serial.println("Blynk connection failed. Please check your auth token or server.");
  }

  timer.setInterval(2000L, sendUltrasonicData);
  timer.setInterval(5000L, checkConnections);
}

void loop() {
  if (!manualLEDControl) {
    int ldrStatus = digitalRead(LDR_PIN);
    int pirStatus = digitalRead(PIR_PIN);

    if (ldrStatus == HIGH && pirStatus == HIGH) {
      digitalWrite(LED_PIN, HIGH);
      Serial.println("LED ON: Dark and motion detected.");
    } else {
      digitalWrite(LED_PIN, LOW);
      Serial.println("LED OFF: No motion or sufficient light.");
    }
  }

  if (Blynk.connected()) {
    Blynk.run();
  }
  timer.run();
}