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

#define buzzer 21

const byte rows = 4;
const byte columns = 4;
int holdDelay = 700; //Thời gian trễ để xem là nhấn 1 nút nhằm tránh nhiễu

char keys[rows][columns] =
{
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'},
};

byte rowPins[rows] = {19, 18, 5, 17}; //Cách nối chân với Arduino
byte columnPins[columns] = {16, 4, 0, 2};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, columnPins, rows, columns);

String defpass = "1234";
String password = "";

const char * MQTTServer = "broker.emqx.io";
const char * MQTT_Topic = "Phuc/Hoc/Keypad";

// Tạo ID ngẫu nhiên tại: https://www.guidgen.com/
const char * MQTT_ID = "phuc";
int Port = 1883;

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

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) {

}

void guidulieu(String a){
  client.publish(MQTT_Topic, a.c_str());
}

void setup() {
  Serial.begin(115200);
  WIFIConnect();
  client.setServer(MQTTServer, Port);
  pinMode(buzzer, OUTPUT);

}

void loop() {
  delay(10);
  if (!client.connected()) {
    MQTT_Reconnect();
  }
  digitalWrite(buzzer, HIGH);
    Serial.println("zzzzzz");
  delay(300);
  digitalWrite(buzzer, LOW);
    Serial.println("doi");
  delay(300);

  client.loop();
    char key = keypad.getKey();
    if (key != '#'){
      password += key;
    }else{
      guidulieu(password);
      Serial.println(password);
      password = "";
    }
}