#include <WiFi.h>
#include <PubSubClient.h>
#include <ArduinoJson.h>
#include "DHTesp.h"

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "broker.hivemq.com";
const char* stopic = "luuvachiase/led";
const char* ptopic = "luuvachiase/temp";

const int DHT_PIN = 15; 
char result_temp[10]; 
char result_hum[10]; 

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

DHTesp dhtSensor;

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(".");
  }

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

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Create a random client ID
    String clientId = "ESP8266Client-";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(clientId.c_str())) {
      Serial.println("connected");
      // Once connected, publish an announcement...
      client.publish(ptopic, "hello world");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

void publish_temp()
{
      TempAndHumidity  data_temp = dhtSensor.getTempAndHumidity();
      dtostrf(data_temp.temperature, 6, 2, result_temp); // Leave room for too large numbers!
      dtostrf(data_temp.humidity, 6, 2, result_hum); // Leave room for too large numbers!

      DynamicJsonDocument json(100);
      json["temp"] = result_temp;
      json["humi"] = result_hum;

      String jsonString;
      serializeJson(json, jsonString);
      
      const char* payload = jsonString.c_str();
      Serial.print("Publishing: ");
      Serial.println(payload);
      client.publish(ptopic, payload);
      Serial.print("Done!");

}

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

  pinMode(12, OUTPUT);     // Initialize the BUILTIN_LED pin as an output
  pinMode(14, OUTPUT);  
  pinMode(13, OUTPUT); 
  Serial.begin(115200);
  // Start the DHT22 sensor
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);

  setup_wifi();
  client.setServer(mqtt_server, 1883);
  
}

void loop() {
   if (!client.connected()) {
    reconnect();
  }
  client.loop();
  publish_temp();
  delay(3000);
}