#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <DHT.h>

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

// Konfigurasi Pin Berdasarkan Gambar
#define DHTPIN 13       // Pin Sensor DHT22
#define DHTTYPE DHT22
#define PIR_PIN 27      // Pin Sensor PIR (Gerakan)
#define LDR_PIN 34      // Pin LDR (Analog)
#define RELAY_PIN 14    // Pin Relay (Lampu)
#define BUZZER_PIN 12   // Pin Buzzer

DHT dht(DHTPIN, DHTTYPE);

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

  // Inisialisasi Pin
  pinMode(PIR_PIN, INPUT);
  pinMode(LDR_PIN, INPUT);
  pinMode(RELAY_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);

  // Pastikan kondisi awal mati
  digitalWrite(RELAY_PIN, LOW);
  digitalWrite(BUZZER_PIN, LOW);

  // Inisialisasi OLED
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { 
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  
  dht.begin();
  display.clearDisplay();
  display.setTextColor(WHITE);
  Serial.println("Sistem Dimulai...");
}

void loop() {
  // Membaca data sensor
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  int lux = analogRead(LDR_PIN);
  int gerakan = digitalRead(PIR_PIN);

  // Cek apakah sensor DHT terbaca dengan benar
  if (isnan(h) || isnan(t)) {
    Serial.println("Gagal membaca sensor DHT!");
    return;
  }

  // --- LOGIKA UTAMA ---

  bool lampuOn = false;
  bool buzzerOn = false;

  // 1. Logika Lampu: Jika Gelap (<1000 Lux) DAN ada Gerakan
  if (lux < 1000 && gerakan == HIGH) {
    digitalWrite(RELAY_PIN, HIGH);
    lampuOn = true;
  } else {
    digitalWrite(RELAY_PIN, LOW);
  }

  // 2. Logika Buzzer: Jika Temp > 30C DAN Kelembapan < 40%
  if (t > 30 && h < 40) {
    tone(BUZZER_PIN, 800);
    buzzerOn = true;
  } else {
    noTone(BUZZER_PIN);
  }

  // --- TAMPILAN OLED ---
  display.clearDisplay();
  display.setTextSize(1);
  
  display.setCursor(0, 0);
  display.print("Temp: "); display.print(t); display.print(" C");
  
  display.setCursor(0, 15);
  display.print("Hum : "); display.print(h); display.print(" %");
  
  display.setCursor(0, 30);
  display.print("Lux : "); display.print(lux);

  display.setCursor(0, 50);
  display.print("Lampu: "); display.print(lampuOn ? "ON" : "OFF");
  display.setCursor(70, 50);
  display.print("BZR: "); display.print(buzzerOn ? "ON" : "OFF");
  
  display.display();

  // Print ke Serial Monitor untuk debugging
  Serial.print("Lux: "); Serial.print(lux);
  Serial.print(" | Temp: "); Serial.print(t);
  Serial.print(" | Hum: "); Serial.println(h);

  delay(500); // Update data setiap 0.5 detik
}