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

#define WIFI_SSID "Yousra"
#define WIFI_PASSWORD "1234567890"
const char* BOT_TOKEN = "7130187961:AAFFaP2LQDHCdy6gJtOPTeqF0M5GqdTm_i4";
const long CHAT_ID = 1724932489;
WiFiClientSecure secured_client;
UniversalTelegramBot bot(BOT_TOKEN, secured_client);

int flameSensorPin = 27; // Flame sensor on pin 27
int redLedPin = 4;       // Red LED on pin 4
int buzzerPin = 14;      // Buzzer on pin 14
int relayPin = 23;       // Relay on pin 23

void sendTelegramMessage(String message) {
  if (WiFi.status() == WL_CONNECTED) {
    bot.sendMessage(String(CHAT_ID), message, "");
    Serial.println("Message sent successfully");
  } else {
    Serial.println("WiFi not connected");
  }
}

void setup() {
  pinMode(redLedPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(flameSensorPin, INPUT);
  pinMode(relayPin, OUTPUT);
  digitalWrite(relayPin, HIGH); // Initial state of relay set to OFF
  Serial.begin(9600);

  // Initialization of LEDC for buzzer control
  ledcSetup(0, 5000, 8); // Initialize LEDC channel 0 with a frequency of 5000Hz and a resolution of 8 bits
  ledcAttachPin(buzzerPin, 0); // Attach the buzzer pin to LEDC channel 0

  // Connect to WiFi
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  Serial.print("Connecting to WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected.");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
  secured_client.setCACert(TELEGRAM_CERTIFICATE_ROOT);
}

void loop() {
  int sensorValue = digitalRead(flameSensorPin); // Digital reading of the flame sensor

  if (sensorValue == LOW) { // If a flame is detected (LOW means flame detected for this type of sensor)
    // Activate the alarm and send message
    digitalWrite(redLedPin, HIGH);
    ledcWriteTone(0, 4000); // Set the buzzer to emit a sound at 4000Hz
    digitalWrite(relayPin, LOW); // Activate the relay (inverted logic for the green light)
    Serial.println("Danger Detected! Alarm triggered.");
    sendTelegramMessage("Alert: Fire detected 🚨🚨 !");
    
    // Keep the alarm on for 5 seconds
    delay(1000);
    
    // Deactivate the alarm after 5 seconds
    digitalWrite(redLedPin, LOW);
    ledcWriteTone(0, 0); // Stop the buzzer
    digitalWrite(relayPin, HIGH); // Deactivate the relay (inverted logic for the green light)
    Serial.println("Alarm deactivated after 5 seconds.");
  } else {
    // Ensure that the alarm stays off when no danger is detected
    digitalWrite(redLedPin, LOW);
    ledcWriteTone(0, 0); // Stop the buzzer
    digitalWrite(relayPin, HIGH); // Deactivate the relay (inverted logic for the green light)
    Serial.println("No Danger Detected.");
  }

  delay(1000); // Delay for 2 seconds before reading the sensor again
}