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

#define pin_led 12
#define pin_led2 33
#define DHT22PIN 23
bool ledState = LOW;

#define WIFI_AP "Wokwi-GUEST"
#define WIFI_PASS ""

#define BOTtoken "7080775992:AAFVw42vqvveY41QGO16Iv1P-louePEnFtU"
#define CHAT_ID "1564703747"

WiFiClientSecure client;
UniversalTelegramBot bot(BOTtoken, client);
DHT dht(DHT22PIN, DHT22);

int botRequestDelay = 100;
unsigned long lastTimeBotRan;

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 += "/led_on to turn GPIO ON \n";
      welcome += "/led_off to turn GPIO OFF \n";
      welcome += "/state to request current GPIO state \n";
      bot.sendMessage(chat_id, welcome, "");
    }

    if (text == "/led_on") {
      bot.sendMessage(chat_id, "LED state set to ON", "");
      ledState = HIGH;
      digitalWrite(pin_led2, ledState);
    }
    
    if (text == "/led_off") {
      bot.sendMessage(chat_id, "LED state set to OFF", "");
      ledState = LOW;
      digitalWrite(pin_led2, ledState);
    }
    
    if (text == "/state") {
      if (digitalRead(pin_led2)){
        bot.sendMessage(chat_id, "LED is ON", "");
      }
      else{
        bot.sendMessage(chat_id, "LED is OFF", "");
      }
    }
  }
}


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

  pinMode(pin_led, OUTPUT);
  pinMode(pin_led2, OUTPUT);

  WiFi.mode(WIFI_STA);
  WiFi.begin(WIFI_AP, WIFI_PASS);
  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());

  dht.begin();
}

void loop() {
  // put your main code here, to run repeatedly:

  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();
  }
  
  float humi = dht.readHumidity();
  float temp = dht.readTemperature();
  Serial.print("Temperature: ");
  Serial.print(temp);
  Serial.print("ºC ");
  Serial.print("Humidity: ");
  Serial.println(humi);

  if(temp > 35){
    digitalWrite(pin_led, HIGH);
  }else if(temp < 30){
    digitalWrite(pin_led, LOW);
  }
  delay(500);
}