#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>
#include <WiFi.h>
#include <FirebaseESP32.h>  // Use FirebaseESP8266.h if using ESP8266
#include "SdFat.h"


// LCD configuration
LiquidCrystal_I2C lcd(0x27, 16, 2); // LCD address 0x27 for 16x2 display
const char* ssid = "moheb";
const char* password = "21579720027196002";

// Firebase credentials
#define FIREBASE_HOST "https://system-6145d-default-rtdb.firebaseio.com"  // Replace with your Firebase database URL
#define FIREBASE_AUTH "AIzaSyDWx79lMTu-A5LLdbFeM7uyVArzV0B231g"
FirebaseData firebaseData;   // Optional: Use Firebase secret or API key

// Pin assignments
const int dhtPin = 16;  // GPIO16 for DHT22 data pin
const int red = 13;    // Red LED
const int green = 12;  // Green LED
const int buzzer = 25; // Buzzer

// DHT sensor configuration
#define DHTTYPE DHT22  // Specify the sensor type
DHT dht(dhtPin, DHTTYPE);

#define CS_PIN 21        // Chip select pin for SD card
#define SPI_SPEED SD_SCK_MHZ(4)  // SPI speed for SD card

// Declare SD card object
SdFat sd;

void setup() {

WiFi.begin(ssid, password);

  Serial.print("Connecting to Wi-Fi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }
  Serial.println("\nConnected to Wi-Fi");

  // Firebase initialization
  Firebase.begin(FIREBASE_HOST, FIREBASE_AUTH);
  Firebase.reconnectWiFi(true);



  // Pin configurations
  pinMode(red, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(buzzer, OUTPUT);

  // Initialize DHT sensor
  dht.begin();

  // Initialize Serial Monitor for debugging
  Serial.begin(115200); // Serial monitor baud rate

  // Initialize SD card
  if (!sd.begin(CS_PIN, SPI_SPEED)) {
    if (sd.card()->errorCode()) {
      Serial.println("SD initialization failed.");
    } else if (sd.vol()->fatType() == 0) {
      Serial.println("Can't find a valid FAT16/FAT32 partition.");
    } else {
      Serial.println("Can't determine error type");
    }
    return;  // Exit if SD card initialization fails
  }

  // Initialize LCD
  lcd.init();
  lcd.clear();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("DHT22 Temp Sensor");
  delay(2000);
  lcd.clear();

  // SD Card initialization succeeded
  Serial.println("SD Card Initialized");
}

void loop() {
  // Read temperature from DHT22
  float temperatureC = dht.readTemperature();

  if (Firebase.setString(firebaseData, "/alerts/message", "Fire detected!")) {
    Serial.println("Message sent to Firebase");
  } else {
    Serial.println("Failed to send message: " + firebaseData.errorReason());
  }

  // Validate sensor reading
  if (isnan(temperatureC)) {
    Serial.println("Failed to read from DHT22 sensor!");
    lcd.setCursor(0, 0);
    lcd.print("Sensor Error!   ");
    lcd.setCursor(0, 1);
    lcd.print("Check Wiring    ");
    delay(2000); // Wait 2 seconds before retrying
    return;
  }

  // Debugging: Print temperature to Serial Monitor
  Serial.print("Temperature (C): ");
  Serial.println(temperatureC);

  // Update LCD with the current temperature
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperatureC, 1); // Display temperature with 1 decimal place
  lcd.print(" C  ");

  // Open file on SD card to log data
  File dataFile = sd.open("temp_log.txt", FILE_WRITE);
  
  if (dataFile) {
    // Write temperature data with timestamp to the file
    dataFile.print("Temp: ");
    dataFile.print(temperatureC, 1);
    dataFile.println(" C");
    dataFile.close();  // Don't forget to close the file to save data
    Serial.println("Temperature logged to SD card.");
  } else {
    Serial.println("Error opening temp_log.txt");
  }

  // Check temperature threshold and act accordingly
  if (temperatureC > 76.0) { // Adjust threshold as needed
    digitalWrite(red, HIGH);    // Turn on red LED
    digitalWrite(green, LOW);   // Turn off green LED
    digitalWrite(buzzer, HIGH); // Turn on buzzer
    lcd.setCursor(0, 1);
    lcd.print("High Temp Alert!");
  } else {
    digitalWrite(red, LOW);     // Turn off red LED
    digitalWrite(green, HIGH);  // Turn on green LED
    digitalWrite(buzzer, LOW);  // Turn off buzzer
    lcd.setCursor(0, 1);
    lcd.print("Temp Normal     ");
  }

  delay(2000); // Update every 2 seconds
}