#include <Wire.h>
#include <RTClib.h>
#include <LiquidCrystal_I2C.h>
#include "DHT.h"

#define DHTPIN 2     
#define DHTTYPE DHT22 
#define RELAYPIN 8

// Threshold suhu dan kelembaban
#define TEMP_THRESHOLD 30.0
#define HUMIDITY_THRESHOLD 60.0

// Jam operasi kipas
#define START_HOUR 7
#define END_HOUR 14

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);  // Coba 0x27 dulu, jika tidak berfungsi coba 0x3F
RTC_DS3231 rtc;

void setup() {
  Serial.begin(9600);
  dht.begin();

  // Inisialisasi RTC
  if (!rtc.begin()) {
    Serial.println("Tidak bisa menemukan RTC");
    while (1);
  }
  
  // Inisialisasi LCD
  lcd.init();        // Gunakan init() bukan begin()
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Sistem Kipas");
  lcd.setCursor(0, 1);
  lcd.print("Otomatis v1.0");
  delay(2000);
  lcd.clear();
  
  // Setup relay pin
  pinMode(RELAYPIN, OUTPUT);
  digitalWrite(RELAYPIN, LOW); // Pastikan kipas mati saat startup
  
  // Setting waktu RTC (uncomment jika perlu set manual)
  /*
  DateTime now = rtc.now();
  rtc.adjust(DateTime(
    now.year(),
    now.month(),
    now.day(),
    8,  // Jam manual
    0,  // Menit manual
    0   // Detik
  ));
  */
  
  Serial.println("Sistem siap!");
}

void loop() {
  // Baca sensor DHT22
  float temp = dht.readTemperature();
  float hum = dht.readHumidity();
  
  // Baca waktu dari RTC
  DateTime now = rtc.now();
  
  // Cek apakah pembacaan sensor berhasil
  if (isnan(temp) || isnan(hum)) {
    lcd.setCursor(0, 0);
    lcd.print("Sensor Error!   ");
    lcd.setCursor(0, 1);
    lcd.print("Periksa koneksi ");
    Serial.println("Error: Gagal membaca sensor DHT22");
    delay(2000);
    return;
  }
  
  // Tampilkan data di LCD
  displayData(temp, hum, now);
  
  // Logika kontrol kipas
  bool shouldTurnOn = false;
  
  // Cek kondisi: waktu operasi DAN suhu DAN kelembaban
  if (now.hour() >= START_HOUR && now.hour() < END_HOUR) {
    if (temp > TEMP_THRESHOLD && hum > HUMIDITY_THRESHOLD) {
      shouldTurnOn = true;
    }
  }
  
  // Kontrol relay
  if (shouldTurnOn) {
    digitalWrite(RELAYPIN, HIGH); // Kipas ON
    lcd.setCursor(0, 1);
    lcd.print("ON ");
    Serial.println("Kipas: ON");
  } else {
    digitalWrite(RELAYPIN, LOW); // Kipas OFF
    lcd.setCursor(0, 1);
    lcd.print("OFF");
    Serial.println("Kipas: OFF");
  }
  
  // Debug info ke Serial Monitor
  Serial.print("Waktu: ");
  Serial.print(now.hour());
  Serial.print(":");
  Serial.print(now.minute());
  Serial.print(" | Suhu: ");
  Serial.print(temp);
  Serial.print("°C | Kelembaban: ");
  Serial.print(hum);
  Serial.println("%");
  
  delay(1000);
}

void displayData(float temp, float hum, DateTime now) {
  // Baris pertama: Suhu dan status kipas
  lcd.setCursor(0, 0);
  lcd.print("T:");
  if (temp < 10) lcd.print(" ");
  lcd.print(temp, 1);
  lcd.print((char)223);
  lcd.print("C ");
  
  // Baris kedua: Kelembaban dan waktu
  lcd.setCursor(9, 0);
  lcd.print("H:");
  if (hum < 10) lcd.print(" ");
  lcd.print(hum, 1);
  lcd.print("% ");
  
  lcd.setCursor(4,1);
  lcd.print("Pukul :");
  // Tampilkan waktu di pojok kanan bawah
  lcd.setCursor(10, 1);
  if (now.hour() < 10) lcd.print("0");
  lcd.print(now.hour());
  lcd.print(":");
  if (now.minute() < 10) lcd.print("0");
  lcd.print(now.minute());
}