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

#define BTN_PIN 16

const char *mqtt_broker = "yandex-cpp.cloud.shiftr.io";
const char *topic = "light";
const char *mqtt_username = "yandex-cpp";
const char *mqtt_password = "O1UNfc6vB9DtjEvl";
const int mqtt_port = 1883;
const char *client_name = "switch-esp32";

bool btnLastState = true;
bool btnState = false;
bool lampState = false;

WiFiClient espClient;
PubSubClient client(espClient);

void connectWiFi(){
  Serial.print("Connecting to WiFi");
  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println(" Connected!");
}

void connectMQTT(){
  Serial.print("Connecting to MQTT");
  while (!client.connected()) {
          if (client.connect(client_name, mqtt_username, mqtt_password)) {
              Serial.println(" Connected!");
          } else {
              Serial.print(".");
              delay(1000);
          }
      }
}

void setup() {
  Serial.begin(115200);
  pinMode(BTN_PIN, INPUT_PULLUP);
  connectWiFi();
  client.setServer(mqtt_broker, mqtt_port);
  connectMQTT();
}

void checkBtn(){
  btnState = digitalRead(BTN_PIN);
  if (btnLastState == true && btnState == false) { // Проверили, что состояние изменилось 
    lampState = !lampState;
    if (lampState) {
      client.publish(topic, "on");
    } else {
      client.publish(topic, "off");
    }
  }

  btnLastState = btnState;
}

void loop() {
  if (WiFi.status() != WL_CONNECTED) {
    connectWiFi();
  }
  if (!client.connected()) {
    connectMQTT();
  }
  client.loop();
  checkBtn();
  delay(10);
}