#define BLYNK_TEMPLATE_ID "TMPL6jHJBZ0U5"
#define BLYNK_TEMPLATE_NAME "tebe"
#define BLYNK_AUTH_TOKEN "gSMn66bhfMe7-XEgGxM6XRbsZ3om8V2y"

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

// ⚠️ GANTI INI 3 HAL!
char auth[] = "gSMn66bhfMe7-XEgGxM6XRbsZ3om8V2y";
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// Pin Definitions
#define DHT_PIN 4
#define DHT_TYPE DHT22
#define RELAY_PIN 5

// Objects
DHT dht(DHT_PIN, DHT_TYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);
BlynkTimer timer;

// Variables
float temperature = 0;
float humidity = 0;
bool relayState = false;
float tempThreshold = 28.0;
float humidThreshold = 60.0;
unsigned long lastUpdate = 0;
const unsigned long updateInterval = 2000;

void setup() {
  Serial.begin(115200);
  
  // Initialize Hardware
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, LOW);
  dht.begin();
  lcd.init();
  lcd.backlight();
  
  
  // LCD Startup
  lcd.setCursor(0, 0);
  lcd.print("Sistem Starting...");
  lcd.setCursor(0, 1);
  lcd.print("Connect WiFi...");
  
  // Blynk Connect
  Blynk.begin(auth, ssid, pass);
  
  // Timer untuk Blynk update
  timer.setInterval(2000L, blynkUpdate);
  
  Serial.println("=== SISTEM SIAP ===");
  lcd.clear();
  lcd.print("Blynk OK!");
  delay(1000);
}

void loop() {
  Blynk.run();
  timer.run();
  
  // Update sensor setiap 2 detik
  if (millis() - lastUpdate > updateInterval) {
    readSensors();
    autoControlRelay();
    updateDisplay();
    printToSerial();
    lastUpdate = millis();
  }
}

void readSensors() {
  temperature = dht.readTemperature();
  humidity = dht.readHumidity();
  
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("❌ DHT Read Failed!");
    temperature = 0;
    humidity = 0;
    return;
  }
}

// ========================= BLYNK FUNCTIONS =========================
// Update data ke Blynk (3 widget: V0=Switch, V1=Suhu, V2=Kelembaban)
void blynkUpdate() {
  Blynk.virtualWrite(V1, temperature);  // Suhu ke Value Display V1
  Blynk.virtualWrite(V2, humidity);     // Kelembaban ke Value Display V2
}

// Blynk Switch V0 - Manual Control Relay
BLYNK_WRITE(V0) {
  int value = param.asInt();
  relayState = value;
  digitalWrite(RELAY_PIN, relayState);
  
  String status = relayState ? "ON (Manual)" : "OFF (Manual)";
  Serial.println("🔘 Blynk: " + status);
}

// ========================= AUTO CONTROL =========================
void autoControlRelay() {
  bool autoOn = (temperature > tempThreshold) || (humidity > humidThreshold);
  
  if (autoOn && !relayState) {
    relayState = true;
    digitalWrite(RELAY_PIN, HIGH);
    Serial.println("🤖 AUTO: Relay ON (Threshold)");
    
  }
  else if (!autoOn && relayState) {
    relayState = false;
    digitalWrite(RELAY_PIN, LOW);
    Serial.println("🤖 AUTO: Relay OFF");
  }
}

// ========================= DISPLAY =========================
void updateDisplay() {
  lcd.clear();
  
  // Baris 1: Suhu & Kelembaban
  lcd.setCursor(0, 0);
  lcd.print("T:");
  lcd.print(temperature, 1);
  lcd.print("C H:");
  lcd.print(humidity, 1);
  lcd.print("%");
  
  // Baris 2: Relay + Threshold
  lcd.setCursor(0, 1);
  lcd.print("R:");
  lcd.print(relayState ? "ON" : "OFF");
  lcd.print(" TH:");
  lcd.print(tempThreshold, 0);
  lcd.print("C");
}

void printToSerial() {
  Serial.println("═════ STATUS ═════");
  Serial.print("🌡️  Suhu:     "); Serial.print(temperature, 1); Serial.println(" °C");
  Serial.print("💧  Kelembaban: "); Serial.print(humidity, 1); Serial.println(" %");
  Serial.print("🔌  Relay:     "); Serial.println(relayState ? "ON" : "OFF");
  Serial.print("🎯  Threshold: "); Serial.print(tempThreshold); Serial.print("°C / "); Serial.print(humidThreshold); Serial.println("%");
  Serial.println("══════════════════");
}