#define BLYNK_TEMPLATE_ID "TMPL6TqZslt_a"
#define BLYNK_TEMPLATE_NAME "advance cooling system"

#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <DHT_U.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <ESP32Servo.h>
#include <BlynkSimpleEsp32.h>

#define BLYNK_AUTH_TOKEN "e-U2bUQ8BK6J0L6szeMUW6UJIGKKN2qo"
#define BLYNK_PRINT Serial

// Pin definitions
#define DHTPIN 4
#define DHTTYPE DHT22
#define PIRPIN 14
#define LED1PIN 15
#define LED2PIN 16
#define RELAYPIN 17
#define SERVOSIGNALPIN 18
#define BUZZERPIN 19

// Initialize DHT sensor
DHT dht(DHTPIN, DHTTYPE);

// Initialize OLED display
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

// Initialize Servo
Servo myServo;

bool systemState = false; // false: system off, true: system on
bool lastPirState = LOW; // To store the last state of the PIR sensor

char auth[] = BLYNK_AUTH_TOKEN;  // Blynk authentication token
char ssid[] = "Wokwi-GUEST";    // Your WiFi SSID
char pass[] = ""; // Your WiFi Password

BLYNK_CONNECTED() {
  Blynk.syncAll();
}

BLYNK_WRITE(V0) {
  int relayState = param.asInt(); // Get the value from the Blynk app
  if (relayState == 1) {
    digitalWrite(RELAYPIN, HIGH); // Turn on the relay
    systemState = true;
  } else {
    digitalWrite(RELAYPIN, LOW); // Turn off the relay
    systemState = false;
  }
}

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

  // Initialize DHT sensor
  dht.begin();

  // Initialize LEDs
  pinMode(LED1PIN, OUTPUT);
  pinMode(LED2PIN, OUTPUT);
  pinMode(BUZZERPIN, OUTPUT);

  // Initialize PIR sensor
  pinMode(PIRPIN, INPUT);

  // Initialize Relay
  pinMode(RELAYPIN, OUTPUT);
  digitalWrite(RELAYPIN, LOW); // Turn off relay initially

  // Initialize Servo (signal pin only, no power)
  myServo.attach(SERVOSIGNALPIN);
  myServo.write(0); // Initial position

  // Initialize OLED display
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  display.display();
  delay(2000);
  display.clearDisplay();
  display.display();

  // Connect to WiFi and Blynk
  Blynk.begin(auth, ssid, pass);
}

void loop() {
  Blynk.run(); // Run the Blynk library

  // Read PIR sensor
  int pirState = digitalRead(PIRPIN);

  // Read temperature and humidity
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  // Automatic system control based on temperature
  if (temperature >= 27) {
    digitalWrite(RELAYPIN, HIGH);
  } else if (temperature <= 22) {
    digitalWrite(RELAYPIN, LOW);
  }

  // Check if motion is detected and toggle system state
  if (pirState == HIGH && lastPirState == LOW) {
    systemState = !systemState;
    delay(500); // Debounce delay
  }

  lastPirState = pirState;

  if (systemState) {
    digitalWrite(LED2PIN, HIGH); // System ON indicator
    digitalWrite(RELAYPIN, HIGH); // Turn on relay to power servo

    // Wait for the relay to switch
    delay(100);

    // Move servo to active position
    myServo.write(90);

    // Check temperature and control LED1
    if (temperature > 30) {
      digitalWrite(LED1PIN, HIGH);
      Serial.print("Temp: ");
      Serial.println(temperature);
      Serial.print("Motion state: ");
      Serial.println(pirState);
      Serial.print("Humidity: ");
      Serial.println(humidity);
      Serial.println("led temp: ON ");
      Blynk.virtualWrite(V4, 1);

      soundBuzzer(); // Turn on buzzer if temperature > 30
    } else {
      digitalWrite(LED1PIN, LOW);
      Serial.print("Temp: ");
      Serial.println(temperature);
      Serial.print("Motion state: ");
      Serial.println(pirState);
      Serial.print("Humidity: ");
      Serial.println(humidity);
      Serial.println("led temp: OFF ");
      Blynk.virtualWrite(V4, 0);

      noTone(BUZZERPIN); // Turn off buzzer otherwise
    }

    // Display information on OLED
    display.clearDisplay();
    display.setTextSize(1);
    display.setTextColor(SSD1306_WHITE);
    display.setCursor(0, 0);
    display.print("Temp: ");
    display.print(temperature);
    display.println(" C");
    display.print("Humidity: ");
    display.print(humidity);
    display.println(" %");
    display.print("System: ON");
    display.setCursor(0, 30);
    display.print("Motion: ");
    display.println(pirState == HIGH ? "Detected" : "None");
    display.display();
  } else {
    digitalWrite(LED2PIN, LOW); // System OFF indicator
    digitalWrite(RELAYPIN, LOW); // Turn off relay to cut power to servo

    // Move servo to inactive position
    myServo.write(0);

    digitalWrite(LED1PIN, LOW); // Turn off LED1

    // Display system off message
    display.clearDisplay();
    display.setTextSize(1);
    display.setTextColor(SSD1306_WHITE);
    display.setCursor(0, 0);
    display.print("Temp: ");
    display.print(temperature);
    display.println(" C");
    display.print("Humidity: ");
    display.print(humidity);
    display.println(" %");
    display.print("System: OFF");
    display.setCursor(0, 30);
    display.print("Motion: ");
    display.println(pirState == HIGH ? "Detected" : "None");
    display.display();
  }

  // Control the LED for motion detection
  if (pirState == HIGH) {
    digitalWrite(LED2PIN, HIGH); // Turn on LED1 if motion is detected
    Blynk.virtualWrite(V3, 1);
  } else {
    digitalWrite(LED2PIN, LOW);
    Blynk.virtualWrite(V3, 0); // Turn off LED1 if no motion is detected
  }

  // Add a short delay to avoid bouncing
  delay(500);

  Blynk.virtualWrite(V1, temperature); // Send temperature to Blynk
  Blynk.virtualWrite(V2, humidity); // Send humidity to Blynk
}

void soundBuzzer() {
  for (int i = 0; i < 3; i++) {  // Change the loop to run 3 times instead of 2
    tone(BUZZERPIN, 1000); // Sound the buzzer
    delay(200);           // Sound the buzzer for 200 ms
    noTone(BUZZERPIN);    // Stop the buzzer sound         // Delay for 100 ms before repeating
  }
}