#include <WiFi.h>
#include <HTTPClient.h>
#include <ThingSpeak.h>
#include <FirebaseESP32.h>  // Firebase library

#define RELAY_PIN 27  // Connected to LED or Lock

// WiFi
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// Firebase details
#define FIREBASE_HOST "https://your-project-id.firebaseio.com" // ✅ Add full URL with https://
#define FIREBASE_AUTH "your-database-secret"

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

// ThingSpeak
WiFiClient client;
unsigned long channelID = 2869806;
const char* writeAPIKey = "6Y3JTFY09CMPEMNC";

// Variables
bool doorLock = false;
unsigned long unlockTime = 0;
bool isUnlocked = false;

void sendDataToThingSpeak(bool lockStatus) {
  if (WiFi.status() == WL_CONNECTED) {
    ThingSpeak.setField(1, lockStatus);
    int statusCode = ThingSpeak.writeFields(channelID, writeAPIKey);
    if (statusCode == 200) {
      Serial.println("Channel update successful.");
    } else {
      Serial.print("Error sending data: ");
      Serial.println(statusCode);
    }
  } else {
    Serial.println("WiFi not connected. Data not sent.");
  }
}

void reconnectWiFi() {
  if (WiFi.status() != WL_CONNECTED) {
    Serial.print("Reconnecting to WiFi...");
    WiFi.reconnect();
  }
}

void setup() {
  Serial.begin(115200);
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, LOW);

  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(1000);
  }
  Serial.println("\nConnected to WiFi");

  ThingSpeak.begin(client);

  // ✅ Firebase Initialization (corrected)
  config.api_key = FIREBASE_AUTH;                // use legacy token as API key
  config.database_url = FIREBASE_HOST;
  Firebase.reconnectWiFi(true);
  Firebase.begin(&config, &auth);
}

void loop() {
  reconnectWiFi();
  checkLockTimeout();

  // Read virtual button state from Firebase
  if (Firebase.getInt(fbdo, "/lock/button")) {
    int buttonState = fbdo.intData();
    if (buttonState == 1 && !isUnlocked) {
      digitalWrite(RELAY_PIN, HIGH);
      Serial.println("Door Unlocked");
      sendDataToThingSpeak(true);
      unlockTime = millis();
      isUnlocked = true;
    }
  } else {
    Serial.println("Firebase read failed: " + fbdo.errorReason());
  }
}

void checkLockTimeout() {
  if (isUnlocked && millis() - unlockTime >= 10000) {
    digitalWrite(RELAY_PIN, LOW);
    Serial.println("Door Locked");
    sendDataToThingSpeak(false);
    Firebase.setInt(fbdo, "/lock/button", 0);  // Reset button to 0
    isUnlocked = false;
  }
}