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

#define ledHot 2
#define ledCold 4
#define ledPower 14
#define buzzerPin 13
#define switchPin  15
#define DHTPIN 12
#define DHTTYPE DHT22

#define apiKey "II8NDNCPSJU5FO89"
#define channelNumber 2403873

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

int alarmCounter = 0;
int switchStatus;
bool alarmFirstTime = false; 
unsigned long previousMillis = 0; 
long interval = 0; 
WiFiClient client;

void setup() {
  Serial.begin(9600);
  Serial.print("Connecting to WiFi");
  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println(" Connected!");

  pinMode(buzzerPin, OUTPUT);
  pinMode(ledHot, OUTPUT);
  pinMode(ledCold, OUTPUT);
  pinMode(ledPower, OUTPUT);
  pinMode(switchPin, INPUT_PULLUP);

  digitalWrite(ledHot, 1);
  digitalWrite(ledCold, 1);
  digitalWrite(ledPower, 1);

  lcd.init();
  dht.begin();
  lcd.begin(16, 2);
  delay(2000);
  lcd.clear();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Temp: "); 
  lcd.setCursor(0, 1);
  lcd.print("Humi: ");
  ThingSpeak.begin(client);
}

void loop() {
  switchStatus = digitalRead(switchPin);

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

  if (isnan(h) || isnan(t) || isnan(f)) {
    lcd.setCursor(8, 0);
    lcd.print("Error   ");
    lcd.setCursor(10, 1);
    lcd.print("Error   ");
    return;
  }

  float temp = dht.readTemperature();

  lcd.setCursor(8, 0);
  lcd.print(temp, 1);
  lcd.print((char)223);
  lcd.print("C");
  lcd.setCursor(8, 1);
  lcd.print(h, 0);
  lcd.print("%");

  if (switchStatus == LOW) {
    digitalWrite(ledPower, HIGH);
  // Cek kondisi alarm setiap interval waktu
    if (millis() - previousMillis >= interval  || checkTemperatureChange(temp))  {
      ThingSpeak.setField(1, temp);
      ThingSpeak.setField(2, h);
      ThingSpeak.writeFields(channelNumber, apiKey);
      checkAlarmCondition(temp);
      previousMillis = millis(); // Update timestamp
      interval = 1200000; // alarm akan menyala kembali setelah 2 menit
    }
  }else{
    ThingSpeak.setField(1, temp);
    ThingSpeak.setField(2, h);
    ThingSpeak.writeFields(channelNumber, apiKey);
  }
  
  if (switchStatus == LOW) {
    Serial.println("Slide switch aktif (posisi ON)");
  } else {
    Serial.println("Slide switch tidak aktif (posisi OFF)");
  }
  delay(2000);
}

void soundAlarm(int frequency, int duration) {
  for (int i = 0; i < 5; i++) {
    tone(buzzerPin, frequency);
    delay(duration);            
    noTone(buzzerPin);          
    delay(duration);    
  }       
}

void checkAlarmCondition(float temp) {
  if (temp < 20) {
    digitalWrite(ledHot, LOW);
    digitalWrite(ledCold, HIGH);
    soundAlarm(1000, 500);
  } if (temp > 27) {
    digitalWrite(ledHot, HIGH);
    digitalWrite(ledCold, LOW);
    soundAlarm(500, 500);
  }else{
    digitalWrite(ledHot, LOW);
    digitalWrite(ledCold, LOW);
  }
  alarmCounter++; 
  if (alarmCounter >= 5) {
    delay(interval);   
  }
}

bool checkTemperatureChange(float temp) {
  static float previousTemp = temp; // Variabel untuk menyimpan suhu sebelumnya
  // Jika suhu berubah lebih dari 1 derajat Celsius, kembalikan true
  if (abs(temp - previousTemp) > 1.0) {
    previousTemp = temp; 
    return true;
  }
  return false;
}