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

#define DHTPIN D0

// Uncomment whatever type you're using!
//#define DHTTYPE DHT11   // DHT 11
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
//#define DHTTYPE DHT21   // DHT 21 (AM2301)

// Wifi network station credentials
#define WIFI_SSID "Color"
#define WIFI_PASSWORD "YourPass"

// Telegram BOT Token (Get from Botfather)
#define BOT_TOKEN "YourToken"
#define CHAT_ID "YourID"

WiFiClientSecure secured_client;

UniversalTelegramBot bot(BOT_TOKEN, secured_client);

DHT dht(DHTPIN, DHTTYPE);

const unsigned long BOT_MTBS = 1000; // mean time between scan messages
unsigned long bot_lasttime; // last time messages' scan has been done
float temperatureC;
float temperatureF;
float humidity;
int btn;
int led = D10;
int lastButtonState = 0;
void setup()
{
  pinMode(led, OUTPUT);
  Serial.begin(9600);
  Serial.println(F("Ousiafb's XIO_ESP32"));

  dht.begin();

  // attempt to connect to Wifi network:
  Serial.print("Connecting to Wifi SSID ");
  Serial.print(WIFI_SSID);
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  secured_client.setCACert(TELEGRAM_CERTIFICATE_ROOT); // Add root certificate for api.telegram.org
  while (WiFi.status() != WL_CONNECTED)
  {
    Serial.print(".");
    delay(500);
  }
  Serial.print("\nWiFi connected. IP address: ");
  Serial.println(WiFi.localIP());
}

void loop()
{
  btn = digitalRead(D1);
  buttonSateChange();
  humidity = dht.readHumidity();
  // Read temperature as Celsius (the default)
  temperatureC = dht.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
  temperatureF = dht.readTemperature(true);

  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 buttonSateChange() {
  // compare the buttonState to its previous state
  if (btn != lastButtonState) {
    // if the state has changed, increment the counter
    if (btn == HIGH) {
      // if the current state is HIGH then the button went from off to on:
      String msg = "Someone just opened the door";
      bot.sendMessage(CHAT_ID, msg, "");
      Serial.println("opened");
    } 
    else if (btn == LOW) {
      // if the current state is LOW then the button went from on to off:
      String msg = "Someone just closed the door";
      bot.sendMessage(CHAT_ID, msg, "");
      Serial.println("closed");
    }
    // Delay a little bit to avoid bouncing
    delay(50);
  }
  // save the current state as the last state, for next time through the loop
  lastButtonState = btn;
}



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 == "/ButtonState")
      {
        String Door = "";
        String msg = "DoorState: ";
        if (btn == 1)
        {
          Door = "Ay Caramba! You didn't close the door";
        }
        else if (btn == 0)
        {
          Door = "From what I can sense the door is closed";
        }
        msg += msg.concat(Door);
        bot.sendMessage(chat_id, msg, "");
      }
      if (text == "/ON")
      {
        String msg = "Turning led ON :";
        bot.sendMessage(chat_id, msg, "");
        digitalWrite(led, HIGH);
      }
      if (text == "/OFF")
      {
        String msg = "Turning led OFF :";
        bot.sendMessage(chat_id, msg, "");
        digitalWrite(led, LOW);
      }
      if (text == "/start")
      {
        String welcome = "Ousiafb XIO_ESP32.\n";
        welcome += "/tempC : Temperature in celcius \n";
        welcome += "/tempF : Temperature in faranthit\n";
        welcome += "/humidity : Humidity\n";
        welcome += "/ButtonState : 0 or 1\n";
        welcome += "/ON or /OFF to turn led OFF\n";
        bot.sendMessage(chat_id, welcome, "Markdown");
      }
    }
  }
}