#include <Keypad.h>
#include <WiFi.h>
#include "PubSubClient.h"
#include <DHT.h>
#include <DHTesp.h>
const char * MQTTServer = "broker.hivemq.com";
const char * MQTT_Topic = "a";
const char * MQTT_ID = "8194acc9-23c8-4829-b11e-ffd228cf31bd";
int Port = 1883;
int buzzer=21;
const int DHTPIN = 25;
const int DHTTYPE = DHT22;
DHT dht(DHTPIN,DHTTYPE);

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' }
};

uint8_t colPins[COLS] = { 16, 4, 2, 15 };
uint8_t rowPins[ROWS] = { 19, 18, 5, 17 };

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(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);
    }
  }
}
String stMessage;
void callback(char* topic, byte* message, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  Serial.println(topic);
  Serial.print("Message: ");
  stMessage="";
  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    stMessage += (char)message[i];
  }
  Serial.println();
  if(stMessage=="true"){
    tone(buzzer, 1000);
    delay(300);
    noTone(buzzer);
    digitalWrite(buzzer, LOW);  
  }
  else if(stMessage=="false"){
    tone(buzzer, 1000);
    delay(300);
    noTone(buzzer);
    delay(300);
    tone(buzzer, 1000);
    delay(300);
    noTone(buzzer);
    delay(300);
    tone(buzzer, 1000);
    delay(300);
    noTone(buzzer);
    delay(300);
    digitalWrite(buzzer, LOW);  
  }
}
void testdht(){
  float doam = dht.readHumidity();
  float doC = dht.readTemperature();
  Serial.println(doam);
  Serial.println(doC);
  delay(10000);

  String temp = String(doC);
  String humidity = String(doam);
  String JSONMessage = " {\"temp\": \""+temp+"\", \"humidity\": \""+humidity+"\"}";
  client.publish("vlute/dht22/4223", (char*) JSONMessage.c_str());
   Serial.println(JSONMessage);
}
void setup() {
  Serial.begin(9600);
  pinMode(buzzer, OUTPUT);
  WIFIConnect();
  dht.begin();
  client.setServer(MQTTServer, Port);
  client.setCallback(callback);
  client.subscribe(MQTT_Topic);

}
String matkhau;
void loop() {
  if (!client.connected()) {
    MQTT_Reconnect();
  }
  client.loop();
  
  char key = keypad.getKey();
  if (key != NO_KEY && key!='#'&& key!='*') {
    if(matkhau.length()<6){
      matkhau=matkhau+key;
      Serial.println(key);
    }
    else{
      Serial.println("Mật khẩu không quá 6 kí tự, nhập lại!");
      matkhau="";
    }
  }
  else if(key=='*'){
    matkhau="";
    Serial.println("Đã reset mật khẩu");
  }
  else if(key=='#'){
    Serial.println("Mật khẩu đã gửi: "+matkhau);
    client.publish("matkhau/1235",matkhau.c_str());
    matkhau="";

  }
//  delay(10000);

//   float doam = dht.readHumidity();
//   float doC = dht.readTemperature();
//   Serial.println(doam);
//   Serial.println(doC);
//    String temp = String(doC);
//   String humidity = String(doam);
//   String JSONMessage = " {\"temp\": \""+temp+"\", \"humidity\": \""+humidity+"\"}";
//   client.publish("vlute/dht22/4223", (char*) JSONMessage.c_str());
//    Serial.println(JSONMessage);



}