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

// ================= KONFIGURASI PIN =================
#define DHT_SENSOR_PIN 23 
#define POT_PIN        34
#define BUZZER_PIN     13
#define LED_RED        18 // FAST
#define LED_YELLOW     19 // MEDIUM
#define LED_GREEN      5  // OFF

#define DHT_SENSOR_TYPE DHT22 

LiquidCrystal_I2C lcd(0x27, 16, 2);
DHT dht_sensor(DHT_SENSOR_PIN, DHT_SENSOR_TYPE);

void setup() {
  Serial.begin(115200);
  delay(500);

  Serial.println("\n============================================");
  Serial.println("  Smart HVAC - Full System");
  Serial.println("  ESP32 + DHT22 + LCD + LED + BUZZER");
  Serial.println("============================================");

  dht_sensor.begin();
  lcd.init();
  lcd.backlight();
  
  pinMode(LED_RED, OUTPUT);
  pinMode(LED_YELLOW, OUTPUT);
  pinMode(LED_GREEN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(POT_PIN, INPUT);

  lcd.setCursor(0, 0);
  lcd.print("Smart HVAC Init");

  // Beep awal
  tone(BUZZER_PIN, 1000, 200);

  Serial.println("[INIT] Semua komponen siap!");
  delay(1500);
  lcd.clear();
}

void loop() {

  // ===== 1. BACA SETPOINT =====
  int potValue = analogRead(POT_PIN);
  float setpoint = map(potValue, 0, 4095, 20, 35);

  // ===== 2. BACA SUHU =====
  float tempAktual = dht_sensor.readTemperature();

  if (isnan(tempAktual)) {
    Serial.println("[ERROR] Sensor DHT gagal dibaca!");
    lcd.setCursor(0, 0);
    lcd.print("Sensor Error!   ");
    noTone(BUZZER_PIN);
    delay(500);
    return;
  }

  int fanLevel = 0;
  String fanStatus = "";

  // ===== 3. LOGIKA FAN + LED + BUZZER =====
  if (tempAktual < (setpoint + 1.0)) {
    // OFF
    digitalWrite(LED_GREEN, HIGH);
    digitalWrite(LED_YELLOW, LOW);
    digitalWrite(LED_RED, LOW);
    noTone(BUZZER_PIN);

    fanLevel = 0;
    fanStatus = "OFF";
  } 
  else if (tempAktual <= (setpoint + 4.0)) {
    // MEDIUM
    digitalWrite(LED_GREEN, LOW);
    digitalWrite(LED_YELLOW, HIGH);
    digitalWrite(LED_RED, LOW);

    tone(BUZZER_PIN, 500, 50); // beep pendek

    fanLevel = 1;
    fanStatus = "MEDIUM";
  } 
  else {
    // FAST (ALARM)
    digitalWrite(LED_GREEN, LOW);
    digitalWrite(LED_YELLOW, LOW);
    digitalWrite(LED_RED, HIGH);

    tone(BUZZER_PIN, 1500); // bunyi terus

    fanLevel = 2;
    fanStatus = "FAST";
  }

  // ===== 4. SERIAL MONITOR =====
  Serial.println("--------------------------------------------");
  Serial.print("[HVAC] Waktu    : ");
  Serial.print(millis() / 1000);
  Serial.println(" detik");

  Serial.print("[HVAC] Suhu     : ");
  Serial.print(tempAktual, 1);
  Serial.println(" C");

  Serial.print("[HVAC] Setpoint : ");
  Serial.print(setpoint, 0);
  Serial.println(" C");

  Serial.print("[HVAC] Error    : ");
  float err = tempAktual - setpoint;
  if (err >= 0) Serial.print("+");
  Serial.print(err, 1);
  Serial.println(" C");

  Serial.print("[HVAC] Fan      : ");
  Serial.println(fanStatus);

  // Bar indikator kecepatan
  int pct = (fanLevel == 0) ? 0 : (fanLevel == 1) ? 50 : 100;
  int filled = (pct * 20) / 100;

  Serial.print("[HVAC] Speed    : [");
  for (int i = 0; i < 20; i++) {
    if (i < filled) Serial.print("#");
    else Serial.print("-");
  }
  Serial.print("] ");
  Serial.print(pct);
  Serial.println("%");

  Serial.println("--------------------------------------------");

  // ===== 5. LCD =====
  lcd.setCursor(0, 0);
  lcd.print("T:");
  lcd.print(tempAktual, 1);
  lcd.print("C S:");
  lcd.print(setpoint, 0);
  lcd.print("C ");

  lcd.setCursor(0, 1);
  lcd.print("STATUS: ");
  lcd.print(fanStatus);
  lcd.print("   ");

  delay(500);
}