#include <WiFi.h>
#include "DHT.h"
#include <WiFiClientSecure.h>
#include <UniversalTelegramBot.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
DHT dht(18, DHT22); 

#define ledPin  2
#define WIFI_SSID     "Wokwi-GUEST"
#define WIFI_PASSWORD ""
#define BOT_TOKEN     "8412476718:AAFQhYH89R83iqoi3Z0VNxDlxEOivu9mu5w"

const unsigned long BOT_MTBS = 1000; // mean time between scan messages

WiFiClientSecure secured_client;
UniversalTelegramBot bot(BOT_TOKEN, secured_client);
unsigned long bot_lasttime; // last time messages' scan has been done
float suhu;
int kelembaban;

void handleNewMessages(int numNewMessages){
  Serial.print("handleNewMessages ");
  Serial.println(numNewMessages);

  for (int i = 0; i < numNewMessages; i++) {
    String chat_id = bot.messages[i].chat_id;
    String text = bot.messages[i].text;

    String from_name = bot.messages[i].from_name;
    if (from_name == "")
      from_name = "Guest";

    if (text == "/ledon") {
      digitalWrite(ledPin, LOW); 
      bot.sendMessage(chat_id, "Led is ON " + chat_id, "");
    }

    if (text == "/ledoff") {
      digitalWrite(ledPin, HIGH); 
      bot.sendMessage(chat_id, "Led is OFF"  + chat_id, "");
    }

    if (text == "/ceksensor") {
      String balasan = "Lapor Boss, Kondisi sensor saat ini:\n";
      balasan += "Suhu : " + String(suhu) + " Celsius\n";
      balasan += "Kelembaban : " + String(kelembaban) + " %\n";
      bot.sendMessage(chat_id, balasan, "Markdown");
    }

    if (text == "/start") {
      String welcome = "Welcome to Universal Arduino Telegram Bot library, " + from_name + ".\n";
      welcome += "This is Flash Led Bot example.\n\n";
      welcome += "/ledon : to switch the Led ON\n";
      welcome += "/ledoff : to switch the Led OFF\n";
      welcome += "/status : Returns current status of LED\n";
      bot.sendMessage(chat_id, welcome, "Markdown");
    }
  }
}

void setup(){
  Serial.begin(115200);
  Serial.println();
  pinMode(ledPin, OUTPUT); // initialize digital ledPin as an output.
  lcd.backlight(); lcd.init();
  lcd.setCursor(0,0); lcd.print("PROJECT TELEGRAM");
  lcd.setCursor(0,1); lcd.print("Connecting...");
  
  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());
  lcd.setCursor(0,1); lcd.print("WiFi Connected..");
  Serial.print("Retrieving time: ");
  configTime(0, 0, "pool.ntp.org"); // get UTC time via NTP
  time_t now = time(nullptr);
  while (now < 24 * 3600){
    Serial.print(".");
    delay(100);
    now = time(nullptr);
  }
  Serial.println(now);
  dht.begin();
}

void loop(){
  kelembaban = dht.readHumidity();
  suhu = dht.readTemperature();
  lcd.setCursor(0,1); 
  lcd.print("T="); lcd.print(suhu,1); lcd.write(223); lcd.print("C   ");
  lcd.print("H="); lcd.print(kelembaban); lcd.print("% ");

  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();
  }
}