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

// Inisialisasi RTC, LCD, DHT, dan sensor kelembapan tanah
RTC_DS3231 rtc;
LiquidCrystal_I2C lcd(0x27, 16, 2); // Ganti alamat jika perlu
#define DHTPIN 2
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);
#define SOIL_PIN A0  // Sensor kelembapan tanah analog

// Variabel tampilan bergantian
unsigned long lastSwitchTime = 0;
const unsigned long interval = 3000; // 3 detik
int displayState = 0; // 0: Waktu, 1: DHT, 2: Tanah

void setup() {
  Serial.begin(9600);
  Wire.begin();
  lcd.begin(16, 2);
  lcd.backlight();
  lcd.clear();

  dht.begin();

  if (!rtc.begin()) {
    Serial.println("RTC tidak ditemukan");
    lcd.setCursor(0, 0);
    lcd.print("RTC Error");
    while (1);
  }

  if (rtc.lostPower()) {
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }

  lcd.setCursor(0, 0);
  lcd.print("Sistem Siap");
  delay(2000);
  lcd.clear();
}

void loop() {
  unsigned long currentMillis = millis();

  if (currentMillis - lastSwitchTime >= interval) {
    displayState = (displayState + 1) % 3; // 0 -> 1 -> 2 -> kembali ke 0
    lastSwitchTime = currentMillis;
    lcd.clear();
  }

  if (displayState == 0) {
    // Tampilan waktu
    DateTime now = rtc.now();
    lcd.setCursor(0, 0);
    lcd.print(now.day());
    lcd.print('/');
    lcd.print(now.month());
    lcd.print('/');
    lcd.print(now.year());

    lcd.setCursor(0, 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());
    lcd.print(':');
    if (now.second() < 10) lcd.print('0');
    lcd.print(now.second());
  }

  else if (displayState == 1) {
    // Tampilan suhu & kelembapan udara
    float temp = dht.readTemperature();
    float hum = dht.readHumidity();

    if (isnan(temp) || isnan(hum)) {
      lcd.setCursor(0, 0);
      lcd.print("DHT Error");
    } else {
      lcd.setCursor(0, 0);
      lcd.print("Temp: ");
      lcd.print(temp);
      lcd.print((char)223);
      lcd.print("C");

      lcd.setCursor(0, 1);
      lcd.print("Hum : ");
      lcd.print(hum);
      lcd.print("%");
    }
  }

  else if (displayState == 2) {
    // Tampilan kelembapan tanah
    int soilValue = analogRead(SOIL_PIN); // nilai 0–1023
    int soilPercent = map(soilValue, 1023, 0, 0, 100); // sesuaikan arah pembacaan

    lcd.setCursor(0, 0);
    lcd.print("Soil: ");
    lcd.print(soilPercent);
    lcd.print("%");
  }

  delay(500); // delay pendek untuk stabilisasi
}