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

const char * MQTTServer = "broker.hivemq.com";
const char * MQTT_Topic = "KEYPAD";

// Tạo ID ngẫu nhiên tại: https://www.guidgen.com/
const char * MQTT_ID = "4ce1aeba-cc0d-467b-bb1c-9cac83950b09";
int Port = 1883;
const uint8_t ROWS = 4;
const uint8_t COLS = 4;
char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};
String abc = "";
uint8_t colPins[COLS] = { 16, 4, 2, 15  }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 19, 18, 5, 17 }; // Pins connected to R1, R2, R3, R4

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

WiFiClient espClient;
PubSubClient client(espClient);

void WIFIConnect() {
  Serial.println("Connecting to SSID: Wokwi-GUEST");
  WiFi.begin("Wokwi-GUEST", "");
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    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];
  }
}


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

  WIFIConnect();
  client.setServer(MQTTServer, Port);
  client.setCallback(callback);
}

void loop() {
  char key = keypad.getKey();

  if(key != '#'){
    
    Serial.println(key);
    {
      pass +=key;
    }
    else{
      GuiPass(pass);
      Serial.println(pass);
      pass= "";
    }
  }
  delay(10);
  client.loop();
}
//bt