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

// -------- Define Pins -----------

//Button Pin (pulled down to ground)
#define BUTTON_PIN 13     // ✓
#define GAS_1_PIN 34      // ✓
#define GAS_2_PIN 39      // ✓
#define dht11_PIN 4       // ✓
#define redLED_PIN 16     // ✓
#define greenLED_PIN 17   // ✓
#define blueLED_PIN 18    // ✓
#define buzzer1_PIN 21    // ✓
#define buzzer2_PIN 22    // ✓

DHT dht(4, DHT11);

int old_hum = 0;
int count = 0;

int GAS_1_Value;
int GAS_2_Value;
float temp_Value;
float hum_Value;

volatile bool buttonPressedFlag = false;

const unsigned long BOT_MTBS = 1000; // mean time between scan messages
unsigned long bot_lasttime;          // last time messages' scan has been done

// Wifi network station credentials
#define WIFI_SSID "network"
#define WIFI_PASSWORD "123456789"
// Telegram BOT Token (Get from Botfather)
#define BOT_TOKEN "5360711622:AAGDERb3AC-MfQyCZkQwTtjNkQuaXKM1N3s"
//"5047012559:AAH7kbV_cqOglOJxyBEctmevjoKS6Tp295g"
//"5018567050:AAGiKQLOERxiFGlKYVZA5bI_bKz4vPeOp54"

// Use @myidbot (IDBot) 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 "473975732"
//"-697950614"
//"473975732"

WiFiClientSecure secured_client;
UniversalTelegramBot bot(BOT_TOKEN, secured_client);

//////////////////////////////////////////////////////////

void handleNewMessages(int numNewMessages)
{
  Serial.println("handleNewMessages");
  Serial.println(String(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 == "/send_test_action")
    {
      bot.sendChatAction(chat_id, "typing");
      delay(4000);
      bot.sendMessage(chat_id, "Did you see the action message?");
    }

    if (text == "/Sensor_Data") {
      int   value1  = checkGAS_1();
      int   value2 = checkGAS_2();
      float value3 = checkTemp();
      float value4 = checkHum();
      bot.sendMessage(chat_id, "GAS[1] reading is : " + String(value1));
      bot.sendMessage(chat_id, "GAS[2] reading is : " + String(value2));
      bot.sendMessage(chat_id, "Temprature reading is : " + String(value3));
      bot.sendMessage(chat_id, "Humidity reading is : " + String(value4));
    }

    if (text == "/options") {
      String keyboardJson = "[[\"/Sensor_Data\"]]";
      bot.sendMessageWithReplyKeyboard(chat_id, "Choose from one of the following options", "", keyboardJson, true);
    }

    if (text == "/start")
    {
      String welcome = "Welcome to Universal Arduino Telegram Bot library, " + from_name + ".\n";
      welcome += "This is Chat Action Bot example.\n\n";
      welcome += "/Sensor_Data : to return the current sensors data\n";
      welcome += "/options : returns a custom reply keyboard\n";
      bot.sendMessage(chat_id, welcome);
    }
  }
}
//////////////////////////////////////////////////////////



void setup() {
  Serial.begin(115200);
  Serial.println();

  pinMode(BUTTON_PIN, INPUT);
  pinMode(GAS_1_PIN, INPUT);
  pinMode(GAS_2_PIN, INPUT);
  pinMode(dht11_PIN, INPUT);
  dht.begin();
  pinMode(redLED_PIN, OUTPUT);
  pinMode(greenLED_PIN, OUTPUT);
  pinMode(blueLED_PIN, OUTPUT);
  pinMode(buzzer1_PIN, OUTPUT);
  pinMode(buzzer2_PIN, OUTPUT);

  digitalWrite(redLED_PIN, 0);
  digitalWrite(greenLED_PIN, 1);
  digitalWrite(blueLED_PIN, 1);
  digitalWrite(buzzer1_PIN, 0);
  digitalWrite(buzzer2_PIN, 0);

  attachInterrupt(BUTTON_PIN, interuptButtonPressed, RISING);


  // attempt to connect to Wifi network:
  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);

  bot.sendMessage(CHAT_ID, "Bot started up", "");
  delay(20000);
  Serial.println("delay finished");
}

int checkGAS_1() {
  int value1 = analogRead(GAS_1_PIN);
  Serial.print("GAS[1] value: ");
  Serial.println(value1);
  return value1;
}
int checkGAS_2() {
  int value2 = analogRead(GAS_2_PIN);
  Serial.print("GAS[2] value: ");
  Serial.println(value2);
  return value2;
}
float checkTemp() {
  float value3 = dht.readTemperature();
  Serial.print("temprature value: ");
  Serial.println(value3);
  return value3;
}
float checkHum() {
  float value4 = dht.readHumidity();
  Serial.print("humidity value: ");
  Serial.println(value4);
  return value4;
}

void interuptButtonPressed() {
  Serial.println("SOS Button was pressed!!");
  int button = digitalRead(BUTTON_PIN);
  if (button == HIGH)
  {
    buttonPressedFlag = true;
  }
  return;
}
void handleButtonPressed() {
  bot.sendMessage(CHAT_ID, "SOS Button was pressed!! HELP");
  buttonPressedFlag = false;
}

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();
  }
  ///////////////////////////////////////////
  delay(50);
  if ( buttonPressedFlag ) {
    handleButtonPressed();
  }
  delay(50);
  GAS_1_Value = checkGAS_1();
  if (GAS_1_Value > 900) {
    bot.sendMessage(CHAT_ID, "GAS[1] detected " + String(GAS_1_Value));
    digitalWrite(redLED_PIN, 1);
    digitalWrite(blueLED_PIN, 0);
    digitalWrite(buzzer1_PIN, 1);
  }
  else if (GAS_1_Value < 900 && GAS_2_Value < 1500 && temp_Value < 30 && hum_Value < 93) {
    digitalWrite(redLED_PIN, 0);
    digitalWrite(blueLED_PIN, 1);
    digitalWrite(buzzer1_PIN, 0);
  }
  delay(50);
  GAS_2_Value = checkGAS_2();
  if (GAS_2_Value > 1500) {
    bot.sendMessage(CHAT_ID, "GAS[2] detected " + String(GAS_2_Value));
    digitalWrite(redLED_PIN, 1);
    digitalWrite(blueLED_PIN, 0);
    digitalWrite(buzzer1_PIN, 1);
  }
  else if (GAS_1_Value < 900 && GAS_2_Value < 1500 && temp_Value < 30 && hum_Value < 93) {
    digitalWrite(redLED_PIN, 0);
    digitalWrite(blueLED_PIN, 1);
    digitalWrite(buzzer1_PIN, 0);
  }
  delay(50);
  temp_Value = checkTemp();
  hum_Value = checkHum();
  if (temp_Value > 30) {
    bot.sendMessage(CHAT_ID, "HIGH Tempreture detected " + String(temp_Value));
    digitalWrite(redLED_PIN, 1);
    digitalWrite(greenLED_PIN, 0);
    digitalWrite(buzzer2_PIN, 1);
  }
  else if (GAS_1_Value < 900 && GAS_2_Value < 1500 && temp_Value < 30 && hum_Value < 93) {
    digitalWrite(redLED_PIN, 0);
    digitalWrite(greenLED_PIN, 1);
    digitalWrite(buzzer2_PIN, 0);
  }
  if (hum_Value > 93) {
    digitalWrite(redLED_PIN, 1);
    digitalWrite(greenLED_PIN, 0);
    if (old_hum != hum_Value) {
      count = 0;
    }
    if (count < 5) {
      old_hum = hum_Value;
      count = count + 1;
      bot.sendMessage(CHAT_ID, "HIGH Humidity detected " + String(hum_Value));
      digitalWrite(buzzer2_PIN, 1);
    }
    else {
      digitalWrite(buzzer2_PIN, 0);
    }
  }
  else if (GAS_1_Value < 900 && GAS_2_Value < 1500 && temp_Value < 30 && hum_Value < 93) {
    digitalWrite(redLED_PIN, 0);
    digitalWrite(greenLED_PIN, 1);
    digitalWrite(buzzer2_PIN, 0);
  }
  delay(50);

}//end of Loop