#include <WiFi.h>
#include <WiFiClientSecure.h>
#include <UniversalTelegramBot.h>
#include "DHT.h"

#define BLYNK_TEMPLATE_ID "TMPL6-nECsGzz"
#define BLYNK_TEMPLATE_NAME "PROJECT KEL 1"
#define BLYNK_AUTH_TOKEN "UAuqBsffQDilaFu_js3EzSi0uwBYXYJs"

#define DHTPIN 12
#define Buzzer 2

#define DHTTYPE DHT22

#define WIFI_SSID "Wokwi-GUEST"
#define WIFI_PASSWORD ""

#define BOT_TOKEN "6732290998:AAGMISKT_R_f6hi7cG2TvPo7TLvWmLR2oWE"
#define CHAT_ID "6623025776"

WiFiClientSecure secured_client;

UniversalTelegramBot bot(BOT_TOKEN, secured_client);

DHT dht(DHTPIN, DHTTYPE);

const unsigned long BOT_MTBS = 1000;
unsigned long bot_lasttime;
float temperatureC;
float temperatureF;
float humidity;

void setup()
{
  Serial.begin(9600);
  pinMode(Buzzer, OUTPUT);
  Serial.println(F("DHTxx test!"));

  dht.begin();

  Serial.print("Connecting to Wifi SSID ");
  Serial.print(WIFI_SSID);
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  secured_client.setCACert(TELEGRAM_CERTIFICATE_ROOT);
  while (WiFi.status() != WL_CONNECTED)
  {
    Serial.print(".");
    delay(500);
  }
  Serial.print("\nWiFi connected. IP address: ");
  Serial.println(WiFi.localIP());
}

void loop()
{
  humidity = dht.readHumidity();
  temperatureC = dht.readTemperature();
  temperatureF = dht.readTemperature(true);
    if (temperatureC < 16)
      {
      tone(Buzzer,500);
      }
      else
      {
      noTone(Buzzer);
      }
  
  if (millis() - bot_lasttime > BOT_MTBS)
  {
    int numNewMessages = bot.getUpdates(bot.last_message_received + 1);
    while (numNewMessages)
    {
      Serial.println("got response");
      handleNewMessages(numNewMessages);
      numNewMessages = bot.getUpdates(bot.last_message_received + 1);
    }
    bot_lasttime = millis();
  }
}

void handleNewMessages(int numNewMessages)
{
  Serial.print("handleNewMessages ");
  Serial.println(numNewMessages);
  for (int i = 0; i < numNewMessages; i++)
  {
    String chat_id = String(bot.messages[i].chat_id);
    if (chat_id != CHAT_ID )
    {
      bot.sendMessage(chat_id, "Unauthorized user", "");
    }
    else
    {
      String text = bot.messages[i].text;
      String from_name = bot.messages[i].from_name;
      if (from_name == "")
        from_name = "Guest";
      if (text == "/tempC")
      {   String msg = "Temperature is ";
          msg += msg.concat(temperatureC);
          msg += "C";
          bot.sendMessage(chat_id,msg, "");
      }
      if (text == "/tempF")
      {  
          String msg = "Temperature is ";
          msg += msg.concat(temperatureF);
          msg += "F";
          bot.sendMessage(chat_id,msg, ""); 
      }
      if (text == "/humidity")
      {  
          String msg = "Humidity is ";
          msg += msg.concat(humidity);
          msg += "%"; 
          bot.sendMessage(chat_id,msg, ""); 
      }
      if (text == "/start")
      {
        String welcome = "DHTxx sensor readings.\n";
        welcome += "/tempC : Temperature in celcius \n";
        welcome += "/tempF : Temperature in faranthit\n";
        welcome += "/humidity : Humidity\n";
        bot.sendMessage(chat_id, welcome, "Markdown");
      }
    }
  }
}