#include <WiFi.h>
#include <NTPClient.h>
#include <WiFiUdp.h>
#include <LiquidCrystal_I2C.h>
#include <WiFiClientSecure.h>
#include <UniversalTelegramBot.h>

// Telegram BOT Token (Get from Botfather)
#define BOT_TOKEN "6484303460:AAGpkw526FkFw4OyUV71Pha221VvvDu0kVw"

//function I2C lcd 16x2
LiquidCrystal_I2C lcd(0x27, 16, 2);

//ntp udp 
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "asia.pool.ntp.org", 28800, 60000);

//wifi SSID ,password network
const char *ssid     = "Wokwi-GUEST";
const char *password = "";

//telegram setup function
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

//const LED
const int led_red= 19; //red LED on pin 19
const int led_yellow = 18; //red LED on pin 18
const int led_green = 5; //red LED on pin 5

//flag LED
int greenStatus = 0;
int redStatus =0;
int yellowStatus =0;

//telegram void read
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 == "/redon")
    {
      digitalWrite(led_red, HIGH); // turn the LED on (HIGH is the voltage level)
      redStatus = 1;
      bot.sendMessage(chat_id, "RED is ON", "");
    }

    if (text == "/redoff")
    {
      redStatus = 0;
      digitalWrite(led_red, LOW); // turn the LED off (LOW is the voltage level)
      bot.sendMessage(chat_id, "RED is OFF", "");
    }
//
    if (text == "/yellowon")
    {
      digitalWrite(led_yellow, HIGH); // turn the LED on (HIGH is the voltage level)
      yellowStatus = 1;
      bot.sendMessage(chat_id, "Yellow is ON", "");
    }

    if (text == "//yellowoff")
    {
      yellowStatus = 0;
      digitalWrite(led_yellow, LOW); // turn the LED off (LOW is the voltage level)
      bot.sendMessage(chat_id, "Yellow is OFF", "");
    }
//2green
    if (text == "/greenon")
    {
      digitalWrite(led_green, HIGH); // turn the LED on (HIGH is the voltage level)
      greenStatus = 1;
      bot.sendMessage(chat_id, "Green is ON", "");
    }

    if (text == "/greenoff")
    {
      greenStatus = 0;
      digitalWrite(led_green, LOW); // turn the LED off (LOW is the voltage level)
      bot.sendMessage(chat_id, "Green OFF", "");
    }

    if (text == "/status")
    {
      if (redStatus==1)
      {
        bot.sendMessage(chat_id, "Red is ON", "");
      }
      if (redStatus==0)
      {
        bot.sendMessage(chat_id, "Red is OFF", "");
      }
    
    if (yellowStatus==1)
      {
        bot.sendMessage(chat_id, "yellow is ON", "");
      }
     if (yellowStatus==0)
      {
        bot.sendMessage(chat_id, "Yellow is OFF", "");
      }
       if (greenStatus==1)
      {
        bot.sendMessage(chat_id, "Green is ON", "");
      }
     if (greenStatus==0)
      {
        bot.sendMessage(chat_id, "Green is OFF", "");
      }
    }

    if (text == "/start")
    {
      String welcome = "Welcome to lab2 DFN40312, " + from_name + ".\n";
      welcome += "CODES BY NASRUL\n\n";
      welcome += "/redon : to switch the Led RED ON\n";
      welcome += "/redoff : to switch the Led RED OFF\n";
      welcome += "/yellowon : to switch the Led YELLOW ON\n";
      welcome += "/yellowoff : to switch the Led YELLOW OFF\n";
      welcome += "/greenon : to switch the Led GREEN ON\n";
      welcome += "/greenoff : to switch the Led GREEN OFF\n";
      welcome += "/status : Returns current status of LED\n";
      bot.sendMessage(chat_id, welcome, "Markdown");
    }
  }
}

void setup() {
  //put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  //setup lcd
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("lab 2 v1");
  lcd.setCursor(0,1);
  lcd.print("By Farhan_2023");
  delay(1000);
  lcd.clear();

  //SSID network wifi setup
  WiFi.begin(ssid, password);
  while ( WiFi.status() != WL_CONNECTED ) {
    delay ( 500 );
    Serial.print ( "." );
  }

  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);
  pinMode(led_red, OUTPUT); // initialize digital ledPin as an output.
  pinMode(led_green, OUTPUT); // initialize digital ledPin as an output.
  pinMode(led_yellow, OUTPUT); // initialize digital ledPin as an output.
  secured_client.setCACert(TELEGRAM_CERTIFICATE_ROOT); // Add root certificate for api.telegram.org

}

void loop() {
  // put your main code here, to run repeatedly:
  timeClient.update();
  Serial.println(timeClient.getFormattedTime());
  //delay(1000);
  lcd.setCursor(0,0);
  lcd.print("Masa:");
  lcd.print(timeClient.getFormattedTime());

  //telegram read message from api
  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();
  }

  delay(10); // this speeds up the simulation
}