#define BLYNK_TEMPLATE_ID "TMPL3Onf5eXZx"
#define BLYNK_TEMPLATE_NAME "smart lock"
#define BLYNK_AUTH_TOKEN "OfJ6zoONxPaBmJpew4d0tfSEdzFhP5Ux"

#define BLYNK_PRINT Serial
#include <WiFi.h>
#include <HTTPClient.h>
#include <ThingSpeak.h>
#include <BlynkSimpleEsp32.h>

char ssid[] = "Wokwi-GUEST";
char pass[] = "";  
#define RELAY_PIN 4  // Connected to LED
char auth[] = BLYNK_AUTH_TOKEN;
BlynkTimer timer;
unsigned long channelID = 2869806;
const char* writeAPIKey = "6Y3JTFY09CMPEMNC";

WiFiClient client;
bool doorLock = false;
unsigned long unlockTime = 0;
bool isUnlocked = false;

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

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

BLYNK_WRITE(V0) {
  if (param.asInt() == 1 && !isUnlocked) {
    digitalWrite(RELAY_PIN, HIGH);
    Serial.println("Door Unlocked");
    sendDataToThingSpeak(true);
    unlockTime = millis();
    isUnlocked = true;
  }
}

void checkLockTimeout() {
  if (isUnlocked && millis() - unlockTime >= 20000) {
    digitalWrite(RELAY_PIN, LOW);
    Serial.println("Door Locked");
    sendDataToThingSpeak(false);
    Blynk.virtualWrite(V0, 0);
    isUnlocked = false;
  }
}

void setup() {
  Serial.begin(115200);
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, LOW);
  WiFi.begin(ssid, pass);
  Serial.print("Connecting to WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  }
  Serial.println("\nConnected to WiFi");
  ThingSpeak.begin(client);
  Blynk.begin(auth, ssid, pass);
  timer.setInterval(10000L, reconnectWiFi);
}

void loop() {
  Blynk.run();
  timer.run();
  checkLockTimeout();
}