#include "DHTesp.h"
#include <WiFi.h>
#include "PubSubClient.h"
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>

const char * MQTTServer = "broker.emqx.io";
const char * MQTT_Topic = "VLUTE/Ngoc";
const char * MQTT_DoAm = "DoAm";
const char * MQTT_NhietDo = "NhietDo";

// Tạo ID ngẫu nhiên tại: https://www.guidgen.com/
const char * MQTT_ID = "98e77b52-0a50-44ff-bc23-2c38d2a2b22e";
int Port = 1883;

#define ROW_NUM     4 
#define COLUMN_NUM  4 
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]      = {19, 18, 5, 17}; 
byte pin_column[COLUMN_NUM] = {16, 4, 0, 2};   

Keypad keypad = Keypad(makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM );
LiquidCrystal_I2C lcd(0x27, 16, 2); 

int cursorColumn = 0;
const int DHT_PIN = 15;
const int ledPin = 26;
const int ledPin1 = 23;
int button_pin = 21;
int Balarm = 13;
int Calarm = 12;
int PIRsensor = 2; 
int Led_TEST = 14;
int button_state = 0;
int nhietdo;
int doam;

DHTesp dhtSensor;

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);
      client.subscribe(MQTT_DoAm);
      client.subscribe(MQTT_NhietDo);

      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(ledPin1, HIGH);
  }
  else if (stMessage == "off") {
    digitalWrite(ledPin1, LOW);
  }
}



void setup() {
  Serial.begin(115200);
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  pinMode(PIRsensor, INPUT); // PIR sensor as input  
  pinMode(Balarm, OUTPUT);   // Buzzer alaram as output
  pinMode(Led_TEST, OUTPUT);
  pinMode(Calarm, OUTPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(ledPin1, OUTPUT);
  pinMode(button_pin, INPUT_PULLUP);
  lcd.init(); // initialize the lcd
  lcd.backlight();
  WIFIConnect();
  client.setServer(MQTTServer, Port);
  client.setCallback(callback);

}

void loop() {
  //bật tắt đèn bằng button
  button_state = digitalRead(button_pin);
  if (button_state == LOW)       
    digitalWrite(ledPin, HIGH); 
  else                          
    digitalWrite(ledPin, LOW);

  //nhiệt độ độ ẩm
  if (!client.connected()) {
    MQTT_Reconnect();
  }
  TempAndHumidity  data = dhtSensor.getTempAndHumidity();
  Serial.println("Temp: " + String(data.temperature, 2) + "°C");
  Serial.println("Humidity: " + String(data.humidity, 1) + "%");
  Serial.println("---");
  client.publish(MQTT_NhietDo, String(data.temperature, 2).c_str());
  client.publish(MQTT_DoAm, String(data.humidity, 1).c_str());
  client.loop();

  //bật tắt đèn bằng điều khiển web
  if (!client.connected()) {
    MQTT_Reconnect();
  }
  client.loop();

  //cảnh báo nhiệt độ, độ ẩm
  doam = int(data.humidity);
  nhietdo = int(data.temperature); 
  delay(500);                         
    if(nhietdo >=40, doam >=65){            
      tone(Calarm, 1600);
      delay(1000);  
    }
    else {
      noTone(Calarm);
    }

  //pir sensor
  int state = digitalRead(PIRsensor); 
  delay(500);                         
    if(state == HIGH){                
      //digitalWrite (Balarm , HIGH);  
      tone(Balarm, 1600);
      digitalWrite (Led_TEST , HIGH); 
      delay(1000);  
    }
    else {
      //digitalWrite (Balarm , LOW);   
      noTone(Balarm);
      digitalWrite (Led_TEST , LOW);
    }

    char key = keypad.getKey();

  if (key) {
    lcd.setCursor(cursorColumn, 0); // move cursor to   (cursorColumn, 0)
    lcd.print(key);                 // print key at (cursorColumn, 0)

    cursorColumn++;                 // move cursor to next position
    if(cursorColumn == 16) {        // if reaching limit, clear LCD
      lcd.clear();
      cursorColumn = 0;
    }
  }
  }