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

/* ===== PIN ===== */
#define DHTPIN   4
#define DHTTYPE  DHT22

#define RELAY1   26
#define RELAY2   27

#define SW_MODE  18
#define SW_R1    19
#define SW_R2    23

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);

bool modeAuto;
float temp, hum;

void setup() {
  pinMode(RELAY1, OUTPUT);
  pinMode(RELAY2, OUTPUT);

  pinMode(SW_MODE, INPUT_PULLUP);
  pinMode(SW_R1, INPUT_PULLUP);
  pinMode(SW_R2, INPUT_PULLUP);

  // ===== Relay Active HIGH → ปิดไว้ก่อน =====
  digitalWrite(RELAY1, LOW);
  digitalWrite(RELAY2, LOW);

  dht.begin();
  lcd.init();
  lcd.backlight();
}

void loop() {

  // กดปุ่ม = AUTO
  modeAuto = (digitalRead(SW_MODE) == LOW);

  temp = dht.readTemperature();
  hum  = dht.readHumidity();

  // ป้องกัน DHT อ่านพลาด
  if (isnan(temp) || isnan(hum)) {
    lcd.setCursor(0, 0);
    lcd.print("DHT ERROR     ");
    delay(2000);
    return;
  }

  if (modeAuto) {
    // ===== AUTO MODE =====
    digitalWrite(RELAY1, (temp >= 30) ? LOW : HIGH);
    digitalWrite(RELAY2, (hum  >= 70) ? LOW: HIGH);
  } else {
    // ===== MANUAL MODE =====
    digitalWrite(RELAY1, digitalRead(SW_R1) == LOW ? LOW: HIGH);
    digitalWrite(RELAY2, digitalRead(SW_R2) == LOW ?LOW :HIGH);
  }

  lcd.setCursor(0, 0);
  lcd.print("T:");
  lcd.print(temp, 1);
  lcd.print("C H:");
  lcd.print(hum, 1);
  lcd.print(" ");

  lcd.setCursor(0, 1);
  lcd.print(modeAuto ? "MODE: AUTO   " : "MODE: MANUAL ");

  delay(2000);
}