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

const char* ssid = "Wokwi-GUEST";
const char* password = "";
WiFiClient wifiClient;

const char* mqttBroker = "broker.hivemq.com";
const char* mqttClientName = "Edgardo"; //CAMBIAR EL USUARIO
const char* mqttUser = ""; 
const char* mqttPass = ""; 
const char* name_topic = "efdi/led/JosepWokwi"; //CAMBIAR EL TOPICO
const char* send_topic = "efdi/led/FrancoP"; //CAMBIAR EL TOPICO
PubSubClient mqttClient(wifiClient);

bool state = false;
int LED = 13;
int BUT = 0;

void setup() {
  
  Serial.begin(115200);

  pinMode(LED, OUTPUT);
  pinMode(BUT, INPUT);

  // Connect to wifi
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
  
  // MQTT setup
  mqttClient.setServer(mqttBroker, 1883);
  mqttClient.setCallback(callback);
}

void loop() {
  // Check if we are still connected to the MQTT broker
  if (!mqttClient.connected()) {
    mqttConnect();
  }

  // Let PubSubClient library do his magic
  mqttClient.loop();

  // Add your publish code here --------------------
  if (!digitalRead(BUT)) {
    publishMessage(send_topic, "on", true);
  }

  else{
    publishMessage(send_topic, "off", true);
  }
  delay(1000);
}

void mqttConnect() {
  
  while (!mqttClient.connected()) {
  
    Serial.print("Attempting MQTT connection...");
  
    if (mqttClient.connect(mqttClientName, mqttUser, mqttPass)) {
  
      Serial.println("connected");
      mqttClient.publish("hello", mqttClientName);
      
      // Topic(s) subscription
      //mqttClient.subscribe(send_topic);
      mqttClient.subscribe(name_topic);
  
    } else {
      
      Serial.print("failed, rc=");
      Serial.print(mqttClient.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    
    }
  }
}

void callback(char* topic, byte* payload, unsigned int length) {
  String incommingMessage = "";
  for (int i = 0; i < length; i++){
    incommingMessage += (char)payload[i];
  } 
  Serial.println("Message arrived[" + String(topic) + "]" + incommingMessage);
  if(incommingMessage == "on"){
    digitalWrite(13, HIGH);
    Serial.println("LED ON");
  }
  else if(incommingMessage == "off"){
    digitalWrite(13, LOW);
    Serial.println("LED OFF");
  }
}

//======================================= publising as string
void publishMessage(const char* topic, String payload, boolean retained) {
  if (mqttClient.publish(topic, payload.c_str(), true))
    Serial.println("Message publised [" + String(topic) + "]: " + payload);
}