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


// Tạo ID ngẫu nhiên tại: https://www.guidgen.com/
const char * MQTT_ID = "0286d2ae-2821-49e7-ad9b-e5a50193962b";
int Port = 1883;

WiFiClient espClient;
PubSubClient client(espClient);
const int ledPin = 2;
const int buttonPin = 16;

int lastButtonState;    
int currentButtonState; 
int cycleCounter = 0;

void WIFIConnect() {
  Serial.println("Connecting to SSID: Wokwi-GUEST");
  WiFi.begin("Wokwi-GUEST", "");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("WiFi connected");
  Serial.print(", IP address: ");
  Serial.println(WiFi.localIP());
}

void MQTT_Reconnect() {
  while (!client.connected()) {
    if (client.connect(MQTT_ID)) {
      Serial.print("MQTT Topic: ");
      Serial.print(MQTT_Topic);
      Serial.print(" connected");
      client.subscribe(MQTT_Topic);
      Serial.println("");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}
void callback(char* topic, byte* message, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  Serial.println(topic);
  Serial.print("Message: ");
  String stMessage;

  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    stMessage += (char)message[i];
  }
  Serial.println();
  if (stMessage == "on") {
    digitalWrite(ledPin, HIGH);
  }
  else if (stMessage == "off") {
    digitalWrite(ledPin, LOW);
  }
}

void setup() {
  Serial.begin(115200);
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(ledDO, OUTPUT);
  WIFIConnect();
  client.setServer(MQTTServer, Port);
  client.setCallback(callback);
  currentButtonState = digitalRead(buttonPin);
}

void loop() {
  lastButtonState = currentButtonState;
  currentButtonState = digitalRead(buttonPin);
  delay(10);
  if (!client.connected()) {
    MQTT_Reconnect();
  }
  client.loop();

  if (lastButtonState == HIGH && currentButtonState == LOW) {
    Serial.println("The button is pressed");

    while (currentButtonState == LOW) {
      for (int i = 0; i < 1; ++i) {
        digitalWrite(ledPin, HIGH);
        delay(5000);
        digitalWrite(ledPin, LOW);
        delay(5000);

        currentButtonState = digitalRead(buttonPin);
        if (currentButtonState == HIGH) {
          return; 
        }
      }

      cycleCounter++;
    }
  }

  delay(50);
}