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

// Informations Wi-Fi
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// Informations MQTT
const char* mqtt_server = "broker.emqx.io";
const char* topic_luminosite = "led/luminosite"; // Topic pour recevoir les données

WiFiClient espClient;
PubSubClient client(espClient);

// Définition des broches pour les LEDs
#define RED_PIN 25
#define GREEN_PIN 26
#define BLUE_PIN 27

// Fonction pour connecter le Wi-Fi
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());
}

// Fonction pour connecter le client MQTT
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 to MQTT broker");
      // Abonnement au topic après connexion
      client.subscribe(topic_luminosite);
      Serial.print("Abonné au topic : ");
      Serial.println(topic_luminosite);
    } else {
      Serial.print("Failed, rc=");
      Serial.print(client.state());
      Serial.println(" trying again in 5 seconds");
      delay(5000);
    }
  }
}

// Fonction callback pour traiter les messages MQTT
void mqttCallback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message reçu sur le topic : ");
  Serial.println(topic);

  String message = "";
  for (int i = 0; i < length; i++) {
    message += (char)payload[i];
  }
  Serial.print("Payload reçu : ");
  Serial.println(message);

  if (strcmp(topic, topic_luminosite) == 0) {
    int brightness = message.toInt(); // Convertir la valeur reçue en entier
    brightness = constrain(brightness, 0, 255); // Limiter entre 0 et 255
    analogWrite(RED_PIN, brightness);
    analogWrite(GREEN_PIN, brightness);
    analogWrite(BLUE_PIN, brightness);
    Serial.print("Luminosité appliquée : ");
    Serial.println(brightness);
  }
}

void setup() {
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(mqttCallback);

  // Configurer les broches comme sorties
  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);
}

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