// Import libraries
#include "WiFi.h"
#include <PubSubClient.h>
#include <DHTesp.h>

// Define pins
#define MQTT_ON 14
#define MQTT_OFF 12
const int DHT_PIN = 15;
DHTesp dht;
/* Wokwi parameters */
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "test.mosquitto.org";

WiFiClient espClient;
PubSubClient client(espClient);
unsigned long lastMsg = 0;
float temp = 0;
float hum = 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){
    Serial.print(".");
    MQTT_state_OFF();
    delay(300);
  }

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

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

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

void setup() {
  pinMode(MQTT_ON, OUTPUT);
  pinMode(MQTT_OFF, OUTPUT);
  dht.setup(DHT_PIN, DHTesp::DHT22);
  setup_wifi();
  client.setServer(mqtt_server,1883);
  client.setCallback(callback);
  Serial.begin(115200);
  Serial.println("Inicializing WiFi...");
  WiFi.mode(WIFI_STA);
  Serial.print("Setup done");  
}


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

  unsigned long now = millis();
  if(now - lastMsg > 2000){
    lastMsg= now;
    TempAndHumidity data = dht.getTempAndHumidity();

    String temp = String (data.temperature, 2);
    client.publish("/temp", temp.c_str());
    String hum = String (data.humidity, 1);
    client.publish("/hum", hum.c_str());
  





  // Outputs
  Serial.print("Temperature: ");
  Serial.println(temp);
  Serial.print("Humidity");
  Serial.print(hum);
  }
}

void MQTT_state_ON(){
  digitalWrite(MQTT_ON,HIGH);
  digitalWrite(MQTT_OFF,LOW);
  Serial.println("MQTT_ON");
}

void MQTT_state_OFF(){
  digitalWrite(MQTT_ON,LOW);
  digitalWrite(MQTT_OFF,HIGH);
  Serial.println("MQTT_OFF");
  delay(100);
}