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

#define DHTPIN 15  // Pin tempat Anda menghubungkan output sensor DHT22
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);

LiquidCrystal_I2C lcd(0x27, 16, 2);  // Alamat I2C LCD dan jumlah kolom dan baris

#define RELAY_PIN_1 5  // Pin untuk Relay 1
#define RELAY_PIN_2 25 // Pin untuk Relay 2

const char* ssid = "Wokwi-GUEST"; ///  wifi ssid 
const char* password = "";
const char* mqtt_server = "test.mosquitto.org";// mosquitto server url

WiFiClient espClient;
PubSubClient client(espClient);
unsigned long lastMsg = 0;

void setup_wifi() { 
  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.mode(WIFI_STA); 
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) { 
    delay(500);
    Serial.print(".");
  }

  randomSeed(micros());

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void callback(char* topic, byte* payload, unsigned int length) { 
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  for (int i = 0; i < length; i++) { 
    Serial.print((char)payload[i]);
  }
}

void reconnect() { 
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    String clientId = "ESP32Client-";
    clientId += String(random(0xffff), HEX);
    if (client.connect(clientId.c_str())) {
      Serial.println("Connected");
      client.publish("/ThinkIOT/Publish", "Monitoring Suhu ");
      client.subscribe("/ThinkIOT/Subscribe"); 
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void displayWelcomeScreen() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("M Naufal Hendri");
  lcd.setCursor(0, 1);
  lcd.print("2103411046");
  delay(2000);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("M Naufal Hendri");
  lcd.setCursor(0, 1);
  lcd.print("121114169");
  delay(2000);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("M Naufal Hendri");
  lcd.setCursor(0, 1);
  lcd.print("5009210137");
}

void displayTemperature(float temperature) {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Suhu: ");
  lcd.print(temperature);
  lcd.print(" C");
  delay(2000);
}

void controlRelays(float temperature) {
  if (temperature < 32.0) {
    lcd.clear();
    digitalWrite(RELAY_PIN_1, HIGH);  // Menyalakan Relay 1 (lampu pemanas) 
    lcd.setCursor(0, 1);
    lcd.print("PEMANAS MENYALA");
  } else {
    digitalWrite(RELAY_PIN_1, LOW);  // Mematikan Relay 1 (lampu pemanas)
    delay(3000);
  }

  if (temperature > 35.0) {
    lcd.clear(); 
    digitalWrite(RELAY_PIN_2, HIGH);  // Menyalakan Relay 2 (kipas pendingin)
    lcd.setCursor(0, 1);
    lcd.print("KIPAS MENYALA");
  } else {
    digitalWrite(RELAY_PIN_2, LOW);  // Mematikan Relay 2 (kipas pendingin)
    delay(3000);
  }
}

void setup() {
  pinMode(2, OUTPUT);     
  Serial.begin(115200);
  setup_wifi(); 
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback); 
  dht.begin();
  lcd.init();  // Inisialisasi LCD
  lcd.backlight();
  displayWelcomeScreen();
  pinMode(RELAY_PIN_1, OUTPUT);
  pinMode(RELAY_PIN_2, OUTPUT);
}

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  unsigned long now = millis();
  if (now - lastMsg > 2000) { // perintah publish data
    lastMsg = now;
    float temperature = dht.readTemperature();
    float humidity = dht.readHumidity();

    String tempStr = String(temperature, 2);
    String humStr = String(humidity, 1);

    client.publish("/Thinkitive/temp", tempStr.c_str()); // publish temp topic /ThinkIOT/temp
    client.publish("/Thinkitive/hum", humStr.c_str());   // publish hum topic /ThinkIOT/hum

    Serial.print("Temperature: ");
    Serial.println(tempStr);
    Serial.print("Humidity: ");
    Serial.println(humStr);

    displayTemperature(temperature);
    controlRelays(temperature);
  }
}