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

// -------- Define Pins -----------
#define Door_PIN    35    // ✓
#define GAS_PIN     34    // ✓
#define Flame_PIN   39    // ✓
#define Relay_PIN   23    // ✓
#define Camera_PIN  18    // ✓ changed from 16 to 18

int GasActivationValue    = 3000;
int FlameActivationValue  = 4000;

int MotionValue;
int GAS_Value;
int Flame_Value;
int door_opened_flag = 0;
int take_photo_flag = 0;
int counter = 0;

///////////////////////////////////// Door Sensor Interval
unsigned long prevMillis  = 0;
const    long interval    = 15000;// for fan 15 Second
///////////////////////////////////// Door Sensor Interval

///////////////////////////////////// Taking Photo Interval
unsigned long prevMillis2  = 0;
const    long interval2    = 5000;
///////////////////////////////////// Taking Photo Interval

///////////////////////////////////// For GPS and GSM
String s = "www.google.com/maps/dir/";
unsigned long intervalGSM = 10000;
static const uint32_t GPSBaud = 9600;
unsigned long previousMillis = 0;
int data_counter;
const size_t BUFSIZE = 300;
char f_buffer[BUFSIZE];
float *f_buf = (float*)f_buffer;
TinyGPSPlus gps;// The TinyGPSPlus object
///////////////////////////////////// For GPS and GSM

volatile bool buttonPressedFlag = false;

#define WIFI_SSID "Thamer"
#define WIFI_PASSWORD "123451234"
#define BOT_TOKEN "6836575708:AAF9ZuMQoycwyrg-ZrJe3AevoUM5gmuSIZs"
#define CHAT_ID "-4059146311"

WiFiClientSecure secured_client;
UniversalTelegramBot bot(BOT_TOKEN, secured_client);


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

  Serial.println("-.-");

  pinMode(Door_PIN, INPUT);
  pinMode(GAS_PIN, INPUT);
  pinMode(Flame_PIN, INPUT);
  pinMode(Relay_PIN, OUTPUT);
  pinMode(Camera_PIN, OUTPUT);

  digitalWrite(Relay_PIN, 0);
  digitalWrite(Camera_PIN, 0);

  //attachInterrupt(Door_PIN, interuptButtonPressed, FALLING);

  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(5000);
  setup_GPS_GSM_Modem();
  Serial.println("delay finished");
}

int checkGAS() {
  int value1 = analogRead(GAS_PIN);
  //Serial.print("GAS value: ");
  //Serial.println(value1);
  return value1;
}
int checkFlame() {
  int value2 = analogRead(Flame_PIN);
  //Serial.print("Flame value: ");
  //Serial.println(value2);
  return value2;
}
/*
  void interuptButtonPressed() {
  Serial.println("Door was opened!!");
  int button = digitalRead(Door_PIN);
  if (button == HIGH)
  {
    buttonPressedFlag = true;
  }
  return;
  }
  void handleButtonPressed() {
  bot.sendMessage(CHAT_ID, "Door was opened!!");
  //turn ON FAN
  digitalWrite(Relay_PIN, 1);
  prevMillis  = millis();
  door_opened_flag = 1;
  buttonPressedFlag = false;
  }
*/
void loop() {

  MotionValue = analogRead(Door_PIN);
  Serial.print("MotionValue: ");
  Serial.println(MotionValue);

  if (MotionValue > 10) {
    bot.sendMessage(CHAT_ID, "Motion Detected!!");
    //turn ON FAN
    digitalWrite(Relay_PIN, 1);
    prevMillis  = millis();
    door_opened_flag = 1;
  }
  if (door_opened_flag) {
    if (millis() - prevMillis >= interval) {
      Serial.println("15 seconds have passed");
      bot.sendMessage(CHAT_ID, "Fan is turning OFF Now");
      //turn OFF FAN
      digitalWrite(Relay_PIN, 0);
      door_opened_flag = 0;
    }
  }


  if (take_photo_flag) {
    if (millis() - prevMillis2 >= interval2) {
      prevMillis2 = millis();
      counter = counter + 1;
      Serial.println("5 seconds have passed");
      //bot.sendMessage(CHAT_ID, "Take Photo");
      //turn ON Camera
      digitalWrite(Camera_PIN, 1);
      delay(1000);
      digitalWrite(Camera_PIN, 0);
      if (counter >= 13) {
        take_photo_flag = 0;
        counter = 0;
      }
    }
  }
  /*
    if ( buttonPressedFlag ) {
      handleButtonPressed();
    }
  */
  delay(50);
  GAS_Value = checkGAS();
  if (GAS_Value > GasActivationValue) {
    sendSMS("GAS detected " + String(GAS_Value));
    delay(1000);
    bot.sendMessage(CHAT_ID, "GAS detected " + String(GAS_Value));
    prevMillis2 = millis();
    take_photo_flag = 1;
    digitalWrite(Camera_PIN, 1);
    delay(1000);
    digitalWrite(Camera_PIN, 0);
  }
  delay(50);
  Flame_Value = checkFlame();
  if (Flame_Value < FlameActivationValue) {
    sendSMS("Flame detected " + String(Flame_Value));
    delay(1000);
    bot.sendMessage(CHAT_ID, "Flame detected " + String(Flame_Value));
    prevMillis2 = millis();
    take_photo_flag = 1;
    digitalWrite(Camera_PIN, 1);
    delay(1000);
    digitalWrite(Camera_PIN, 0);
  }
  delay(50);

}//end of Loop


void setup_GPS_GSM_Modem() {
  Serial2.begin(GPSBaud);

  Serial.println("Starting...");
  Serial2.println("\r");
  Serial2.println("AT\r");
  delay(10);

  Serial2.println("\r");
  Serial2.println("AT+GPS=1\r");

  delay(100);
  Serial2.println("AT+CREG=2\r");
  delay(6000);

  //Serial2.print("AT+CREG?\r");
  Serial2.println("AT+CGATT=1\r");
  delay(6000);

  Serial2.println("AT+CGDCONT=1,\"IP\",\"WWW\"\r");
  delay(6000);

  // Serial2.println("AT+LOCATION=1\r");
  Serial2.println("AT+CGACT=1,1\r");
  delay(6000);

  //Initialize ends
  //Initialize GPS
  Serial2.println("\r");
  Serial2.println("AT+GPS=1\r");
  delay(1000);

  //Serial2.println("AT+GPSMD=1\r");   // Change to only GPS mode from GPS+BDS, set to 2 to revert to default.
  Serial2.println("AT+GPSRD=10\r");
  delay(100);

  // set SMS mode to text mode
  Serial2.println("AT+CMGF=1\r");
  delay(1000);
  //Serial2.println("AT+LOCATION=2\r");
  Serial.println("GSM GPS Setup Executed");
}


void sendSMS(String s) {
  Serial.println("Sending SMS Message");
  Serial2.println("AT+CMGF=1\r");
  delay(1000);
  Serial2.println("AT+CNMI=2,2,0,0,0\r");
  delay(1000);
  Serial2.print("AT+CMGS=\"+966580224645\"\r");//Replace this with your mobile number
  delay(1000);
  Serial2.print(s);
  Serial2.write(0x1A);
  delay(1000);
}