#include <WiFi.h>
#include <Firebase_ESP_Client.h>
#include <LiquidCrystal_I2C.h>
#include "DHT.h"
#include <Wire.h>

// WiFi credentials
#define WIFI_SSID "Wokwi-GUEST"
#define WIFI_PASSWORD ""

// Firebase credentials
#define API_KEY "AIzaSyAcTikrmEPCytcrbT_jz58s9jnZvpIvhcc"   // Replace with Firebase Web API Key
#define DATABASE_URL "https://senson-reading-default-rtdb.asia-southeast1.firebasedatabase.app/"  // Replace with your Firebase RTDB URL
#define USER_EMAIL "[email protected]"
#define USER_PASSWORD "Gowthamasairaj@12345"

// DHT Sensor
#define DHTPIN 15
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// LCD (I2C Address 0x27, 16x2)
LiquidCrystal_I2C lcd(0x27, 16, 2);

// I2C pins
#define I2C_SDA 21
#define I2C_SCL 22

// LED pin
#define LED_PIN 2

// Firebase objects
FirebaseData fbdo;
FirebaseAuth auth;
FirebaseConfig config;

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

  // Initialize I2C with explicit pins
  Wire.begin(I2C_SDA, I2C_SCL);

  // Initialize DHT
  dht.begin();

  // Initialize LCD
  lcd.init();
  lcd.backlight();

  // Initialize LED
  pinMode(LED_PIN, OUTPUT);

  // Connect WiFi
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  Serial.print("Connecting to Wi-Fi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println(" Connected!");

  // Firebase config
  config.api_key = API_KEY;
  config.database_url = DATABASE_URL;

  // Set user credentials
  auth.user.email = USER_EMAIL;
  auth.user.password = USER_PASSWORD;

  // Assign Firebase callback (optional)
  fbdo.setResponseSize(4096);

  // Initialize Firebase
  Firebase.begin(&config, &auth);
  Firebase.reconnectWiFi(true);

  lcd.setCursor(0, 0);
  lcd.print("Heatwave Alert");
  delay(2000);
  lcd.clear();
}

void loop() {
  float temp = dht.readTemperature();
  float hum = dht.readHumidity();

  if (isnan(temp) || isnan(hum)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  Serial.print("Temp: ");
  Serial.print(temp);
  Serial.print(" °C, Hum: ");
  Serial.print(hum);
  Serial.println(" %");

  lcd.setCursor(0, 0);
  lcd.print("Temp:");
  lcd.print(temp);
  lcd.print("C   ");

  lcd.setCursor(0, 1);
  if (temp > 35) {
    lcd.print("Heatwave ALERT! ");
    digitalWrite(LED_PIN, HIGH);
    delay(300);
    digitalWrite(LED_PIN, LOW);
    delay(300);
  } else {
    lcd.print("Normal Condition");
    digitalWrite(LED_PIN, LOW);
  }

  // Upload data to Firebase (new API format)
  if (Firebase.ready()) {
    if (!Firebase.RTDB.setFloat(&fbdo, "/heatwave/temperature", temp)) {
      Serial.println("Temp upload FAILED: " + fbdo.errorReason());
    }

    if (!Firebase.RTDB.setFloat(&fbdo, "/heatwave/humidity", hum)) {
      Serial.println("Humidity upload FAILED: " + fbdo.errorReason());
    }

    if (!Firebase.RTDB.setString(&fbdo, "/heatwave/status", (temp > 35) ? "Heatwave Alert" : "Normal")) {
      Serial.println("Status upload FAILED: " + fbdo.errorReason());
    }
  }

  delay(2000);
}