#include <TinyGPSPlus.h>
#include <WiFi.h>
#include <WiFiClientSecure.h>
#include <UniversalTelegramBot.h>

// Wifi network station credentials
#define WIFI_SSID "iPhone"
#define WIFI_PASSWORD "12333333"
// Telegram BOT Token (Get from Botfather)
#define BOT_TOKEN "5768226421:AAGsAirC4AgKH7MZCFevZ1cpPIaIyMHviYg"
String chat_id = "824758478";
const unsigned long BOT_MTBS = 1000; // mean time between scan messages
String stringMessage = "";
String lonGPS = "";
String latGPS = "";
char Buf[70];
WiFiClientSecure secured_client;
UniversalTelegramBot bot(BOT_TOKEN, secured_client);
unsigned long bot_lasttime;          // last time messages' scan has been done
bool Start = false;

#define Sensor_input 36
int sensor_Aout = 0;
TinyGPSPlus gps;

void setup() {
  Serial.begin(9600);
  Serial2.begin(9600);
  pinMode(Sensor_input, INPUT);
  delay(3000);
  // 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, "Attention");
}


void loop() {
  sensor_Aout = analogRead(Sensor_input);
  //Serial.print("Gas Sensor: ");
  //Serial.println(sensor_Aout);
  while (Serial2.available() > 0)
    if (gps.encode(Serial2.read()))
      displayInfo();
  if (millis() > 5000 && gps.charsProcessed() < 10) {
    Serial.println(F("No GPS detected: check wiring."));
    while (true);
  }
  if (sensor_Aout > 1800) {
    Serial.println("Gas");
    //http://maps.google.com/maps?&z=15&mrt=yp&t=k&q=20.123456+20.123456
    //Send Alert Telegram Message
    //String message = "Alert Gas Detected !! \n Sensor Value: " + String(sensor_Aout) + ".\n";
    //message += "http://maps.google.com/maps?&z=15&mrt=yp&t=k&q=" + String(lat_long) + "+" + String(lng_long) + ".\n";
    bot.sendMessage(chat_id, Buf);
    delay(10000);
  }
  else {
    //Serial.println("No Gas");
  }

}//end of LOOP


void displayInfo() {
  Serial.print(F("Location: "));
  if (gps.location.isValid()) {
    lonGPS = String(gps.location.lng(), 6);
    latGPS = String(gps.location.lat(), 6);
    Serial.print("Lat: ");
    Serial.print(latGPS);
    Serial.print(F(","));
    Serial.print("Lng: ");
    Serial.print(lonGPS);
    Serial.println();
    stringMessage = "http://www.google.com/maps/place/" + latGPS + "," + lonGPS;
    stringMessage.toCharArray(Buf, 70);
  }
  else  {
    Serial.print(F("INVALID"));
    stringMessage = "http://www.google.com/maps/place/21.861307,39.066032";
    stringMessage.toCharArray(Buf, 70);
  }
}