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

const int DHT_PIN = 18;
DHTesp dht;
const char* ssid = "Wokwi-GUEST"; // SSID WiFi
const char* password = "";         // Mot de passe WiFi
const char* mqtt_server = "test.mosquitto.org"; // URL du serveur Mosquitto

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

void setup_wifi() {
  delay(10);
  Serial.println();
  Serial.print("Connexion à ");
  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 connecté");
  Serial.println("Adresse IP :");
  Serial.println(WiFi.localIP());
}

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

void reconnect() {
  while (!client.connected()) {
    Serial.print("Tentative de connexion MQTT...");
    String clientId = "ESP32Client-";
    clientId += String(random(0xffff), HEX);
    if (client.connect(clientId.c_str())) {
      Serial.println("Connecté");
      client.publish("/ThinkIOT/Publish", "Bienvenue");
      client.subscribe("/ThinkIOT/Subscribe");
    } else {
      Serial.print("Échec, rc=");
      Serial.print(client.state());
      Serial.println(" Réessai dans 5 secondes");
      delay(5000);
    }
  }
}

void setup() {
  pinMode(2, OUTPUT);
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
  dht.setup(DHT_PIN, DHTesp::DHT22);
}

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

  unsigned long now = millis();
  if (now - lastMsg > 2000) { // Publish data every 10 seconds
    lastMsg = now;

    // Generate random temperature and humidity values within a specific range
    float randomTemp = random(20, 30);      // Example: Generate a random value between 20 and 30 for temperature
    float randomHumidity = random(40, 70);   // Example: Generate a random value between 40 and 70 for humidity

    // Concatenate the temperature and humidity in a message
    String message = "Temperature: " + String(randomTemp, 2) + ", Humidity: " + String(randomHumidity, 1);

    // Publish the message containing both temperature and humidity
    client.publish("/Thinkitive/temp_hum", message.c_str());

    Serial.println(message);
  }
}