#include "DHTesp.h"
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include <PubSubClient.h>
#include <DHT.h>

//WiFi
const char *ssid = "Wokwi-GUEST";
const char *pass = ""; 

// MQTT broker
const char *mqtt_server = "broker.emqx.io";
const int mqtt_port = 1883;
const char *mqtt_usn = "emqx";
const char *mqtt_pass = "public";

// DHT22 Topic
const char* temperatureTopic = "emqx/suhuiv";
const char* humidityTopic = "emqx/humdiv";


// DHT 22 Declaration
#define DHTPIN 25
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE); 

DHTesp dhtSensor;
LiquidCrystal_I2C lcd(0x27, 16, 2);

//variable for storing the pushbutton status
long now = millis();
long lastMeasure = 0;

// WiFi & Client Publish Declaration
WiFiClient espClient;
PubSubClient client(espClient);

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

void setup() {
  dhtSensor.setup(25, DHTesp::DHT22);
   WiFi.begin(ssid, pass);
    while (WiFi.status() != WL_CONNECTED) {
        //delay(500);
        delay(1000);
        Serial.println("Connecting to WiFi..");
    }
    Serial.println("Connected to the Wi-Fi network");
    
    //Connecting to a mqtt server
    client.setServer(mqtt_server, mqtt_port);
    client.setCallback(callback);

    //Connecting Proccess
    while (!client.connected()) {
        String client_id = "esp32-client-";
        client_id += String(WiFi.macAddress());
        Serial.printf("The client %s connects to the public MQTT broker\n", client_id.c_str());

        //WiFi Condition
        if (client.connect(client_id.c_str(), mqtt_usn, mqtt_pass)) {
            Serial.println("Public EMQX MQTT broker connected");
        } else {
            Serial.print("failed with state ");
            Serial.print(client.state());
            delay(2000);
        }
    }

    //Starting DHT11 scanning
    dht.begin();

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

void loop() {
  TempAndHumidity  data = dhtSensor.getTempAndHumidity();
  
  lcd.setCursor(0,0);
  lcd.print("temperature: ");
  lcd.print(String(data.temperature, 2));
  lcd.print(" C");

  lcd.setCursor(0,1);
  lcd.print("humadity: ");
  lcd.print(String(data.humidity, 1));
  lcd.print(" %");

  delay(2000);
  client.loop();
  
  //untuk menjalankan waktu internal setiap milli seconds pada ESP32 secara independent..
  //ketika millis di baca maka millis akan terus menghitung waktu walau pun ESP32 nya sedang menjalan kan program yang lain
  now = millis();

  //Scanning Process
  if(now - lastMeasure > 2000){
    lastMeasure = now;
    float h = dht.readHumidity();
    float t = dht.readTemperature();
    float hic = dht.computeHeatIndex(t, h, false);

    //Check if any reads failed and exit early (to try again(;
    if(isnan(h) || isnan(t)){
       Serial.println("Failed to read from DHT sensor!");
       return;
    }

    client.publish(humidityTopic, String(h).c_str());
    client.publish(temperatureTopic, String(t).c_str());
  
    Serial.print(F("Humidity: "));
    Serial.print(h);
    Serial.print(F("% Temperature: "));
    Serial.print(t);
    Serial.println(" *C ");
  }
  delay(1000);
}