//https://www.electronicwings.com/esp32/pir-sensor-interfacing-with-esp32
//https://esp32io.com/tutorials/esp32-servo-motor
//https://wokwi.com/projects/323706614646309460
//https://randomnerdtutorials.com/telegram-control-esp32-esp8266-nodemcu-outputs/
//https://randomnerdtutorials.com/telegram-esp32-motion-detection-arduino/
  
#include <ESP32Servo.h>
#include <WiFi.h>
#include <WiFiClientSecure.h>
#include <UniversalTelegramBot.h>   // Universal Telegram Bot Library written by Brian Lough: https://github.com/witnessmenow/Universal-Arduino-Telegram-Bot
#include <ArduinoJson.h>

const int servoPin = 26;
const int PIR_SENSOR_OUTPUT_PIN = 27;  /* PIR sensor O/P pin */

Servo servo;

// Replace with your network credentials
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// Initialize Telegram BOT
#define BOTtoken "6701738664:AAEArb4EUlI9D6litNG4uVjX1E12SiEjaVg"  // your Bot Token (Get from Botfather)

// Use @myidbot to find out the chat ID of an individual or a group
// Also note that you need to click "start" on a bot before it can
// message you
#define CHAT_ID "1295163847"

WiFiClientSecure client;
UniversalTelegramBot bot(BOTtoken, client);

// Checks for new messages every 1 second.
int botRequestDelay = 1000;
unsigned long lastTimeBotRan;

int state = 0;

// Handle what happens when you receive new messages
void handleNewMessages(int numNewMessages) {
  Serial.println("handleNewMessages");
  Serial.println(String(numNewMessages));

  for (int i=0; i<numNewMessages; i++) {
    // Chat id of the requester
    String chat_id = String(bot.messages[i].chat_id);
    if (chat_id != CHAT_ID){
      bot.sendMessage(chat_id, "Unauthorized user", "");
      continue;
    }
    
    // Print the received message
    String text = bot.messages[i].text;
    Serial.println(text);

    String from_name = bot.messages[i].from_name;

    if (text == "/start") {
      String welcome = "Welcome, " + from_name + ".\n";
      welcome += "Use the following commands to control your outputs.\n\n";
      welcome += "/open to turn servo 0  degree \n";
      welcome += "/lock to turn servo 90 degree \n";
      welcome += "/state to request current servo state \n";
      bot.sendMessage(chat_id, welcome, "");
    }

    if (text == "/open") {
      bot.sendMessage(chat_id, "Servo state set to 0", "");
      state = 0;
      servo.write(0);
      delay(100);
    }
    
    if (text == "/lock") {
      bot.sendMessage(chat_id, "Servo state set to 90", "");
      state = 1;
      servo.write(90);
      delay(100);
    }
    
    if (text == "/state") {
      if (state == 1){
        bot.sendMessage(chat_id, "Door is Locked", "");
      }
      else{
        bot.sendMessage(chat_id, "Door is Opened", "");
      }
      return;
    }
  }
}

void setup() {
  pinMode(PIR_SENSOR_OUTPUT_PIN, INPUT);
  servo.attach(servoPin, 500, 2400);
  Serial.begin(115200); /* Define baud rate for serial communication */

  // Connect to Wi-Fi
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  client.setCACert(TELEGRAM_CERTIFICATE_ROOT); // Add root certificate for api.telegram.org
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi..");
  }
  // Print ESP32 Local IP Address
  Serial.println(WiFi.localIP());
}

void loop() {

  if (millis() > lastTimeBotRan + botRequestDelay)  {
    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);
    }
    lastTimeBotRan = millis();
  }

  // int sensor_output;
  // sensor_output = digitalRead(PIR_SENSOR_OUTPUT_PIN);
  // if( sensor_output == LOW )
  // {
  //   Serial.print("No object in sight\n\n");
  //   delay(1000);
  //   servo.write(0);
  //   delay(100);
  // }
  // else
  // {
  //   Serial.print("Object detected\n\n");   
  //   delay(1000);
  //   servo.write(90);
  //   delay(100);
  // } 
}