#define BLYNK_TEMPLATE_ID "TMPL6SVv-Q8qs"
#define BLYNK_TEMPLATE_NAME "TEST"
#define BLYNK_AUTH_TOKEN "n5JIDsXfHfBHJT_aNrtp7ZgSsj_Fyw0i"

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

#define RELAY_PIN  32
#define BUZZER_PIN 2
#define LED_PIN    15
#define LDR_PIN    34 // Pin ADC untuk sensor LDR

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

LiquidCrystal_I2C lcd(0x27, 16, 2);

unsigned long lastChangeTime = 0;
bool displayLightLevel = true;  // Toggle antara level cahaya dan kondisi

const float ADC_MAX = 4095.0; // Resolusi ADC ESP32
const float VREF = 3.3;       // Tegangan referensi ADC (volt)

void setup() {
  Wire.begin(21, 22);
  delay(200);
  lcd.init();
  lcd.backlight();
  lcd.print("LCD OK!");
  delay(1000);

  Serial.begin(115200);
  Serial.println("System Initialized");

  pinMode(RELAY_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(LED_PIN, OUTPUT);

  Blynk.begin(auth, ssid, pass); // Initialize Blynk connection
}

float readLightLevel() {
  int adcValue = analogRead(LDR_PIN); // Baca nilai ADC
  float voltage = (adcValue / ADC_MAX) * VREF; // Hitung tegangan
  float lightLevel = (1 - (voltage / VREF)) * 100; // Hitung persentase cahaya
  return lightLevel; // Kembalikan nilai tingkat cahaya dalam persentase
}

void loop() {
  float lightLevel = readLightLevel(); // Baca tingkat cahaya dari LDR

  unsigned long currentMillis = millis();

  if (currentMillis - lastChangeTime >= 1000) {
    lastChangeTime = currentMillis;
    displayLightLevel = !displayLightLevel;  // Toggle display
  }

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Light: ");
  lcd.print(lightLevel);
  lcd.print(" %");
  Blynk.virtualWrite(V0, lightLevel); // Kirim tingkat cahaya ke Blynk (V0)

  Serial.print("Light Level: ");
  Serial.print(lightLevel);
  Serial.println(" %");

  if (lightLevel > 50) { // Contoh ambang batas untuk kondisi gelap
    digitalWrite(RELAY_PIN, HIGH);
    digitalWrite(LED_PIN, HIGH);
    tone(BUZZER_PIN, 1000);
    Serial.println("Low Light: Warning!");
  } else {
    digitalWrite(RELAY_PIN, LOW);
    digitalWrite(LED_PIN, LOW);
    noTone(BUZZER_PIN);
  }

  delay(500);

  Blynk.run();  // Jalankan Blynk
}

// BLYNK_WRITE untuk kontrol LED dari aplikasi Blynk
BLYNK_WRITE(V2) {
  int pinValue = param.asInt(); // Baca nilai dari pin virtual V2 (Button widget)

  if (pinValue == 1) {  // Jika tombol ditekan
    digitalWrite(LED_PIN, HIGH);  // Nyalakan LED
    Serial.println("LED ON via Blynk");
  } else {  // Jika tombol dilepas
    digitalWrite(LED_PIN, LOW);  // Matikan LED
    Serial.println("LED OFF via Blynk");
  }
}