// https://alitan37.github.io/Esp32-mqtt-project/

// Proje: ESP32 MQTT Interkom Kontrol Ünitesi
// Proje: ESP32 MQTT Interkom Kontrol Ünitesi (Otomatik Kapanan Röle)

#include <WiFi.h>
#include <PubSubClient.h>
#include <Ticker.h>

// WiFi ve MQTT Bilgileri
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqttServer = "broker.emqx.io";
const int port = 1883;

// Pin Tanımlamaları
const int pinGreen = 16;      
const int doorSensorPin = 15; 

// DIP Switch Pinleri ve Durum Takibi
const int dipPins[] = {33, 32, 13, 12, 14, 27, 26, 25};
bool lastDipStates[8] = {LOW, LOW, LOW, LOW, LOW, LOW, LOW, LOW};
String blokDaire[] = {"A11","A21","B11","B21","C11","C21","D11","D21"};
char topic[50]; // sprintf için yeterli uzunlukta buffer

char clientId[50];
WiFiClient espClient;
PubSubClient client(espClient);
Ticker relayTimer;

unsigned long lastPublishTime = 0; 
const long interval = 2000; 
bool lastSentState = HIGH; 

void turnOffRelay() {
  digitalWrite(pinGreen, LOW);
  Serial.println("Zaman Doldu: Röle otomatik KAPATILDI");
  client.publish("role/lock", "OFF"); 
}

void setup() {
  Serial.begin(115200);
  snprintf(clientId, sizeof(clientId), "ESP32-%ld", random(1000000));

  pinMode(pinGreen, OUTPUT);
  digitalWrite(pinGreen, LOW);
  pinMode(doorSensorPin, INPUT_PULLUP); 

  // DIP Switch Pinlerini Giriş Olarak Ayarla
  // INPUT_PULLDOWN kullanıyoruz, switch 3.3V verince HIGH olur
  for (int i = 0; i < 8; i++) {
    pinMode(dipPins[i], INPUT_PULLDOWN);
  }

  // İlk durumları oku ki açılışta "değişim var" sanmasın
  for (int i = 0; i < 8; i++) {
    lastDipStates[i] = digitalRead(dipPins[i]);
  }

  wifiConnect();
  client.setServer(mqttServer, port);
  client.setCallback(callback);

}

void checkDipSwitches() {
  for (int i = 0; i < 8; i++) {
    bool currentState = digitalRead(dipPins[i]);

    // Eğer switch OFF'tan ON konumuna geçtiyse (Yükselen Kenar)
    if (currentState == HIGH && lastDipStates[i] == LOW) {
      char topic[30];
      sprintf(topic, "daire/%s/open", blokDaire[i]); // daire/A11/open, daire/A21/open...
      
      client.publish(topic, "DING");
      Serial.print("Daire Butonu Basildi: ");
      Serial.println(topic);
      
      delay(50); // Basit bir debounce (titreşim engelleme)
    }
    lastDipStates[i] = currentState; // Mevcut durumu kaydet
  }
}

void loop() {
  if (!client.connected()) {
    mqttReconnect();
  }
  client.loop();

  // DIP Switch kontrolü
  checkDipSwitches();

  // Kapı Sensörü Mantığı
  bool currentDoorState = digitalRead(doorSensorPin);
  unsigned long currentMillis = millis();

  if (currentDoorState == LOW) { 
    if (currentMillis - lastPublishTime >= interval) {
      lastPublishTime = currentMillis;
      client.publish("door/status", "DOOROPEN");
      lastSentState = LOW; 
    }
  } 
  else if (currentDoorState == HIGH && lastSentState == LOW) {
    client.publish("door/status", "DOORCLOSE");
    lastSentState = HIGH;
  }
}

void callback(char* topic, byte* message, unsigned int length) {
  String payload = "";
  for (unsigned int i = 0; i < length; i++) payload += (char)message[i];

  if (payload == "ON") {
    digitalWrite(pinGreen, HIGH);
    relayTimer.once(1.5, turnOffRelay); 
  } 
  else if (payload == "OFF") {
    digitalWrite(pinGreen, LOW);
    relayTimer.detach();
  }
}

void wifiConnect() {
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); }
  Serial.println("\nWiFi Baglandi!");
}

void mqttReconnect() {
  while (!client.connected()) {
    if (client.connect(clientId)) {
      client.subscribe("role/lock");
      Serial.println("MQTT Bagli");
    } else { delay(5000); }
  }
}