#define BLYNK_TEMPLATE_ID "TMPL3DyCpFLbf"
#define BLYNK_TEMPLATE_NAME "smart home"
#define BLYNK_AUTH_TOKEN "FrKQOMmZUF08kvGfPuts3DFg_3WBZVCB"

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <DHT.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

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

// Pins
#define LIGHT_PIN 2
#define FAN_PIN 18
#define PIR_PIN 5
#define DHT_PIN 4
#define DHT_TYPE DHT22

DHT dht(DHT_PIN, DHT_TYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Variables
bool autoMode = false;  // 🔥 start in MANUAL (important)
BlynkTimer timer;

unsigned long lastMotionTime = 0;
const int motionDelay = 10000;

bool blinkState = false;
bool shouldBlink = false;

int fanSpeed = 0;

// 🔘 MODE
BLYNK_WRITE(V0) {
  autoMode = param.asInt();

  if (!autoMode) {
    shouldBlink = false;
  }
}

// 💡 LIGHT
BLYNK_WRITE(V1) {
  if (!autoMode) {
    shouldBlink = false;
    digitalWrite(LIGHT_PIN, param.asInt());
  }
}

// 🌬️ FAN (PWM)
BLYNK_WRITE(V2) {
  if (!autoMode) {
    fanSpeed = param.asInt();
    analogWrite(FAN_PIN, fanSpeed);
  }
}

// 🔁 BLINK
void blinkLight() {
  if (autoMode && shouldBlink) {
    blinkState = !blinkState;
    digitalWrite(LIGHT_PIN, blinkState);
  }
}

// 📡 MAIN
void sendData() {
  float temp = dht.readTemperature();
  int motion = digitalRead(PIR_PIN);

  if (isnan(temp)) {
    Serial.println("DHT ERROR");
    return;
  }

  Serial.print("Temp: ");
  Serial.print(temp);
  Serial.print(" | Motion: ");
  Serial.println(motion);

  // AUTO MODE
  if (autoMode) {

    if (motion == HIGH) {
      shouldBlink = true;
      lastMotionTime = millis();
    }

    if (millis() - lastMotionTime > motionDelay) {
      shouldBlink = false;
      digitalWrite(LIGHT_PIN, HIGH);
    }

    if (temp > 30) {
      fanSpeed = map(temp, 30, 50, 100, 255);
    } else {
      fanSpeed = 0;
    }

    analogWrite(FAN_PIN, fanSpeed);
  }

  // 🔥 CRITICAL: Sync everything to Blynk
  Blynk.virtualWrite(V0, autoMode);
  Blynk.virtualWrite(V1, digitalRead(LIGHT_PIN));
  Blynk.virtualWrite(V2, fanSpeed);
  Blynk.virtualWrite(V3, temp);

  // LCD
  lcd.setCursor(0, 0);
  lcd.print("                ");
  lcd.setCursor(0, 0);
  lcd.print("T:");
  lcd.print(temp);
  lcd.print(autoMode ? " A" : " M");

  lcd.setCursor(0, 1);
  lcd.print("                ");
  lcd.setCursor(0, 1);
  lcd.print("L:");
  lcd.print(digitalRead(LIGHT_PIN) ? "ON " : "OFF");

  lcd.print("F:");
  lcd.print(fanSpeed > 0 ? "ON" : "OFF");
}

// 🔧 SETUP
void setup() {
  Serial.begin(115200);

  pinMode(LIGHT_PIN, OUTPUT);
  pinMode(FAN_PIN, OUTPUT);
  pinMode(PIR_PIN, INPUT);

  dht.begin();

  lcd.init();
  lcd.backlight();
  lcd.print("Connecting...");
  
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

  lcd.clear();

  // 🔥 IMPORTANT SYNC
  Blynk.syncVirtual(V0);
  Blynk.syncVirtual(V1);
  Blynk.syncVirtual(V2);

  timer.setInterval(1000L, sendData);
  timer.setInterval(500L, blinkLight);
}

// 🔁 LOOP
void loop() {
  Blynk.run();
  timer.run();
}