#include <WiFi.h>
#include <PubSubClient.h>
#include <SPI.h>
#include <MFRC522.h>
#include <ESP32Servo.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// --- KONFIGURASI WIFI & MQTT ---
// Jika di Wokwi: ssid = "Wokwi-GUEST", password = ""
const char* ssid = "Wokwi-GUEST"; 
const char* password = "";
const char* mqtt_server = "broker.emqx.io"; // INI YANG TADI ERROR (SUDAH DITAMBAHKAN)

// --- KONFIGURASI PIN ---
#define SCK_PIN   18
#define MISO_PIN  19
#define MOSI_PIN  23
#define SS_PIN    5
#define RST_PIN   15
#define LED_G     12
#define LED_R     14
#define SERVO_PIN 13
#define BUZZER_PIN 4

// Inisialisasi Objek
WiFiClient espClient;
PubSubClient client(espClient);
MFRC522 rfid(SS_PIN, RST_PIN);
Servo myservo;
LiquidCrystal_I2C lcd(0x27, 16, 2);

String authorizedUID = "D3 4B 12 A2";

void setup_wifi() {
  delay(10);
  Serial.println("\nConnecting to WiFi...");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi connected");
}

void callback(char* topic, byte* payload, unsigned int length) {
  String message = "";
  for (int i = 0; i < length; i++) {
    message += (char)payload[i];
  }
  if (String(topic) == "pintu/kontrol") {
    if (message == "BUKA") {
      aksesDiterima("Remote MQTTX");
    }
  }
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (client.connect("ESP32_SmartDoor_Client")) {
      Serial.println("connected");
      client.subscribe("pintu/kontrol");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      delay(5000);
    }
  }
}

void setup() {
  Serial.begin(115200);
  
  setup_wifi();
  client.setServer(mqtt_server, 1883); // Sekarang variabel ini sudah terdaftar
  client.setCallback(callback);

  SPI.begin(SCK_PIN, MISO_PIN, MOSI_PIN, SS_PIN);
  rfid.PCD_Init();
  
  myservo.attach(SERVO_PIN);
  myservo.write(0); 
  
  pinMode(LED_G, OUTPUT);
  pinMode(LED_R, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  
  lcd.init();
  lcd.backlight();
  displayReady();
}

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

  if (!rfid.PICC_IsNewCardPresent() || !rfid.PICC_ReadCardSerial()) {
    return;
  }

  String tag = "";
  for (byte i = 0; i < rfid.uid.size; i++) {
    tag.concat(String(rfid.uid.uidByte[i] < 0x10 ? " 0" : " "));
    tag.concat(String(rfid.uid.uidByte[i], HEX));
  }
  tag.toUpperCase();
  tag.trim();

  if (tag == authorizedUID) {
    client.publish("pintu/status", "Akses Diterima via RFID");
    aksesDiterima("Kartu RFID");
  } else {
    client.publish("pintu/status", ("Akses Ditolak: " + tag).c_str());
    aksesDitolak();
  }
  
  rfid.PICC_HaltA();
  rfid.PCD_StopCrypto1();
  displayReady();
}

void aksesDiterima(String source) {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Akses Diterima");
  lcd.setCursor(0, 1);
  lcd.print("Via: " + source);

  tone(BUZZER_PIN, 523); delay(150);
  tone(BUZZER_PIN, 659); delay(150);
  tone(BUZZER_PIN, 784); delay(150);
  noTone(BUZZER_PIN);

  digitalWrite(LED_G, HIGH);
  myservo.write(90); 
  delay(5000); 
  
  lcd.clear();
  lcd.print("Pintu Terkunci");
  tone(BUZZER_PIN, 784); delay(150); 
  tone(BUZZER_PIN, 523); delay(150);
  noTone(BUZZER_PIN);

  myservo.write(0);  
  digitalWrite(LED_G, LOW);
  delay(1000);
}

void aksesDitolak() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Akses Ditolak!");
  lcd.setCursor(0, 1);
  lcd.print("Kartu Salah");
  
  digitalWrite(LED_R, HIGH);
  tone(BUZZER_PIN, 200); delay(500);
  noTone(BUZZER_PIN);
  
  delay(1000);
  digitalWrite(LED_R, LOW);
}

void displayReady() {
  lcd.clear();
  lcd.setCursor(3, 0);
  lcd.print("SMART DOOR");
  lcd.setCursor(0, 1);
  lcd.print("Tempelkan Kartu");
}