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

// Ganti ke DHT11
#define DHTPIN 2
#define DHTTYPE DHT11

#define POT_SUHU A0

#define LED_HEATER1 9
#define LED_HEATER2 10

// LED indikator tambahan yang selalu menyala
#define LED_IND1 11
#define LED_IND2 12
#define LED_IND3 13

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 20, 4);

bool heaterOn = false;

unsigned long lastDhtMs = 0;
unsigned long lastLcdMs = 0;
const unsigned long dhtInterval = 1000;
const unsigned long lcdInterval = 250;

float suhuAsli = NAN, humidityAsli = NAN;
float suhu = NAN, kelembapan = NAN;

void setup() {
  pinMode(LED_HEATER1, OUTPUT);
  pinMode(LED_HEATER2, OUTPUT);
  pinMode(LED_IND1, OUTPUT);
  pinMode(LED_IND2, OUTPUT);
  pinMode(LED_IND3, OUTPUT);

  lcd.begin(20, 4);
  lcd.backlight();
  dht.begin();

  // Nyalakan LED indikator sistem
  digitalWrite(LED_IND1, HIGH);
  digitalWrite(LED_IND2, HIGH);
  digitalWrite(LED_IND3, HIGH);

  lcd.clear();
  lcd.setCursor(0, 1); lcd.print(" SISTEM PENGERINGAN ");
  lcd.setCursor(0, 2); lcd.print(" BIJI KOPI CASCARA  ");
  delay(1000);
  lcd.clear();
}

void readSensors() {
  unsigned long now = millis();
  if (now - lastDhtMs >= dhtInterval) {
    lastDhtMs = now;

    float t = dht.readTemperature();
    float h = dht.readHumidity();

    if (!isnan(t)) suhuAsli = t;
    if (!isnan(h)) humidityAsli = h;

    int potSuhu = analogRead(POT_SUHU);
    float offsetSuhu = map(potSuhu, 0, 1023, -10, 10); // ubah offset sesuai kebutuhan

    suhu = constrain(suhuAsli + offsetSuhu, -20, 100);
    kelembapan = constrain(humidityAsli, 0, 100);
  }
}

void controlLogic() {
  if (isnan(suhu)) return;

  // Logika heater: MATI di atas/sama dengan 45°C, NYALA di bawah 45°C
  if (suhu >= 40) {
    heaterOn = false;
  } else {
    heaterOn = true;
  }

  digitalWrite(LED_HEATER1, heaterOn ? HIGH : LOW);
  digitalWrite(LED_HEATER2, heaterOn ? HIGH : LOW);
}

void updateLCD() {
  unsigned long now = millis();
  if (now - lastLcdMs < lcdInterval) return;
  lastLcdMs = now;

  lcd.setCursor(0, 0);
  lcd.print("T:");
  if (!isnan(suhu)) {
    lcd.print(suhu, 1);
  } else {
    lcd.print("--.-");
  }
  lcd.write(byte(223));
  lcd.print("C  H:");
  if (!isnan(kelembapan)) {
    lcd.print(kelembapan, 1);
  } else {
    lcd.print("--.-");
  }
  lcd.print("%   ");

  lcd.setCursor(0, 1);
  lcd.print("Mode: AUTO          ");

  lcd.setCursor(0, 2);
  lcd.print("Heater: ");
  lcd.print(heaterOn ? "ON " : "OFF");
  lcd.print("        ");

  lcd.setCursor(0, 3);
  lcd.print("Offset:");
  int potVal = analogRead(POT_SUHU);
  float offsetSuhu = map(potVal, 0, 1023, 20, 40);
  lcd.print(offsetSuhu, 0);
  lcd.print("C         ");
}

void loop() {
  readSensors();
  controlLogic();
  updateLCD();
}