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

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

#define green   25
#define yellow  26
#define red     27
#define led      2
#define kuning  18
#define DHTPIN  19     
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

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

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;

    Serial.print("Pengirim : ");
    Serial.print(chat_id); Serial.print(", ");
    Serial.println(from_name);
    if (from_name == "")
      from_name = "Guest";

    if (text == "/ledon"){
      digitalWrite(led, HIGH); // turn the LED on (HIGH is the voltage level)
      bot.sendMessage("chat_id", "Oke BOSS, Lampu saya nyalakan", "");
      bot.sendMessage("7407329348", "Oke BOSS, Lampu saya nyalakan", "");
    }

    if (text == "/ledoff"){
      digitalWrite(led, LOW); // turn the LED off (LOW is the voltage level)
      bot.sendMessage(chat_id, "Led is OFF", "");
    }

    if (text == "/ceksensor"){
      
    }

    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";
      welcome += "Contact Us: Difi (0852327864848) \n";
      bot.sendMessage(chat_id, welcome, "Markdown");
    }
  }
}

void setup() {
  pinMode(led,OUTPUT);
  pinMode(kuning,OUTPUT);
  pinMode(red,OUTPUT);
  pinMode(yellow,OUTPUT);
  pinMode(green,OUTPUT);
  
  lcd.backlight(); lcd.init();
  lcd.setCursor(0,0); lcd.print("  JAM DIGITAL  ");
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  dht.begin();

  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());

  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);
}

void loop() {
  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();
  }
  
  if(Serial.available()) {
    char input_serial = Serial.read();
    if(input_serial == 'a') {
      digitalWrite(kuning,HIGH);
      lcd.setCursor(9,1); lcd.print("K = ON ");
    }
    else if(input_serial == 'B') {
      digitalWrite(kuning,LOW);
      lcd.setCursor(9,1); lcd.print("K = OFF");
    }
  }
  digitalWrite(led,HIGH); 
  lcd.setCursor(0,1); lcd.print("LED ON ");
  delay(500);
  digitalWrite(led,LOW); 
  lcd.setCursor(0,1); lcd.print("LED OFF");
  delay(500);
  
  int   h = dht.readHumidity();
  float t = dht.readTemperature();
  lcd.setCursor(0,0); 
  lcd.print("T="); lcd.print(t,1); lcd.write(223); lcd.print("C   ");
  lcd.print("H="); lcd.print(h); lcd.print("% ");
  if(t<30) {
    digitalWrite(green,HIGH); 
    digitalWrite(yellow,LOW);
    digitalWrite(red,LOW);
  }
  else if(t>=30 && t<=40) {
    digitalWrite(green,LOW); 
    digitalWrite(yellow,HIGH);
    digitalWrite(red,LOW);
  }
  else {
    digitalWrite(green,LOW); 
    digitalWrite(yellow,LOW);
    digitalWrite(red,HIGH);
  }

  Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.println(F("°C "));
}