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

// const char * MQTTServer = "broker.hivemq.com";
const char * MQTTServer = "broker.emqx.io";
const char* topicPasswordEntered = "IoT/password_entered";
const char* topicPasswordResponse = "IoT/password_response";

const int buzzerPin = 4;

// Tạo ID ngẫu nhiên tại: https://www.guidgen.com/
const char * MQTT_ID = "8748c87e-736d-4327-9e75-a52a0e497dd8";
int Port = 1883;

WiFiClient espClient;
PubSubClient client(espClient);

String password = "1234"; 
String enteredPassword = ""; 



#define ROW_NUM     4 // four rows
#define COLUMN_NUM  4 // four columns

const uint8_t ledPins[] = {15, 2, 4, 5, 18, 19};
const int numLed = sizeof(ledPins) / sizeof(ledPins[0]);

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

byte pin_rows[ROW_NUM]      = {13, 12, 14, 27};
byte pin_column[COLUMN_NUM] = {26, 25, 33, 32};

Keypad keypad = Keypad(makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM);

int kpc = 144;
int transpose = 0;
int midC = 60;

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(topicPasswordEntered);
      Serial.println(" connected");
      client.subscribe(topicPasswordEntered); 
      Serial.print("MQTT Topic: ");
      Serial.print(topicPasswordResponse);
      client.subscribe(topicPasswordResponse);
      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();

  Serial.println("Callback triggered.");
  Serial.print("Received topic: ");
  Serial.println(topic);
  Serial.print("Received message: ");
  Serial.println(stMessage);

  if (String(topic) == topicPasswordResponse) {
    Serial.println("Received password response.");
    if (stMessage == "correct") {
      Serial.println("Password is correct. Beeping once.");
      beep(1); // Đúng mật khẩu, phát âm báo 1 lần
    } else if (stMessage == "incorrect") {
      Serial.println("Password is incorrect. Beeping three times.");
      beep(3); // Sai mật khẩu, phát âm báo 3 lần
    }
  }
}


void beep(unsigned int count) {
  for (unsigned int i = 0; i < count; i++) {
    digitalWrite(buzzerPin, HIGH);
    Serial.println("Beep");
    delay(100);
    digitalWrite(buzzerPin, LOW);
    if (i < count - 1) delay(100);
  }
}


void setup() {
  Serial.begin(115200);
  WIFIConnect();
  client.setServer(MQTTServer, Port);
  client.setCallback(callback);

  pinMode(buzzerPin, OUTPUT);
}



void loop() {
  delay(10);
  if (!client.connected()) {
    MQTT_Reconnect();
}

  client.loop(); // Đảm bảo xử lý các callback

  char key = keypad.getKey();
  if (key) {
    Serial.println(key);
    if (key == '#') {
      // Gửi mật khẩu đã nhập đến MQTT broker khi người dùng nhấn '#'
      client.publish(topicPasswordEntered, enteredPassword.c_str());
      enteredPassword = ""; // Reset mật khẩu đã nhập
    } else if (key == '*') {
      enteredPassword = ""; // Reset mật khẩu đã nhập khi người dùng nhấn '*'
    } else {
      enteredPassword += key; // Thêm ký tự đã nhập vào biến enteredPassword
    }
  }
}