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

// Deklarasikan pin yang digunakan
int pinBuzzer = 2; // GPIO 18 pada ESP32
int pinPir = 4;   // GPIO 19 pada ESP32
int pinSaklar = 12; // GPIO 4 pada ESP32
int pinLed = 5;    // GPIO 5 pada ESP32

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "test.mosquitto.org";
const char* mqtt_topic = "/hizkia/PIR";

WiFiClient espClient;
PubSubClient client(espClient);
unsigned long lastMsg = 0;
#define MSG_BUFFER_SIZE (50)

void setup() 
{ 
  // Inisialisasi pin
  pinMode(pinBuzzer, OUTPUT); // Set pin buzzer sebagai output
  pinMode(pinPir, INPUT);    // Set pin sensor PIR sebagai input
  pinMode(pinSaklar, INPUT); // Set pin saklar sebagai input dengan pull-up internal aktif
  pinMode(pinLed, OUTPUT);   // Set pin LED sebagai output

  delay(1000); // Delay 1 detik
  Serial.begin(115200); // Mulai komunikasi serial pada kecepatan 115200 bps

  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
} 

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

  unsigned long now = millis();
  if (now - lastMsg > 2000) {
    lastMsg = now;

    int readSaklar = digitalRead(pinSaklar); // Baca nilai dari saklar
    if (readSaklar == HIGH) // Kondisi saat nilai saklar HIGH (saklar dalam posisi tertutup)
    { 
      int readPir = digitalRead(pinPir); // Baca nilai dari sensor PIR
      if (readPir == HIGH) // Jika sensor PIR mendeteksi pergerakan manusia (nilai HIGH)
      { 
        digitalWrite(pinBuzzer, HIGH); // Aktifkan buzzer
        digitalWrite(pinLed, HIGH);    // Aktifkan LED
        delay(1000); // Aktifkan buzzer dan LED selama 1 detik
        Serial.println("Pergerakan Terdeteksi!"); // Cetak pesan ke Serial Monitor
        // Kirim pesan MQTT dengan topik "/hizkia/PIR"
        client.publish(mqtt_topic, "Pergerakan Terdeteksi");
      } 
    }
    else // Jika saklar tidak tertutup (saklar dalam posisi terbuka)
    {
      digitalWrite(pinBuzzer, LOW); // Nonaktifkan buzzer
      digitalWrite(pinLed, LOW);    // Nonaktifkan LED
      Serial.println("Tidak ada Pergerakan!"); // Cetak pesan ke Serial Monitor
      // Kirim pesan MQTT dengan topik "/hizkia/PIR"
      client.publish(mqtt_topic, "Tidak ada Pergerakan");
    } 
  }
}

void setup_wifi() {
  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  randomSeed(micros());

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Create a random client ID
    String clientId = "ESP32Client";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(clientId.c_str())) {
      Serial.println("Connected");
      // Once connected, publish an announcement...
      client.publish(mqtt_topic, "Connected");
      // ... and resubscribe
      client.subscribe(mqtt_topic);
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}