#include <WiFi.h>
#include <WiFiClientSecure.h>
#include <UniversalTelegramBot.h>
#include <ArduinoJson.h>
#include <HTTPClient.h>

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

// Alamat website yang dimonitoring
const char* websiteURL = "https://site.undipa.ac.id/";

// Initialize Telegram BOT
#define BOTtoken "1814579181:AAGUasYhK6z43R9XWL3exoEzdA2CXyAsA3g"
#define CHAT_ID "1209015823"

WiFiClientSecure client;
UniversalTelegramBot bot(BOTtoken, client);

// Variabel waktu untuk pengganti delay
unsigned long previousMillis = 0;
const long interval = 10000; // Interval pemeriksaan 10 detik

void setup() {
  Serial.begin(115200);
  Serial.println("Memulai koneksi WiFi...");
  Serial.println("Mencari WiFi:");
  Serial.println(ssid);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, pass);
  client.setCACert(TELEGRAM_CERTIFICATE_ROOT); // Sertifikat root Telegram
  
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  }

  Serial.println("\nWiFi terhubung!");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
  bot.sendMessage(CHAT_ID, "Memulai Sistem", "");
}

void loop() {
  if (WiFi.status() != WL_CONNECTED) {
    Serial.println("Koneksi WiFi terputus. Mencoba menyambung ulang...");
    WiFi.disconnect();
    WiFi.reconnect();
    delay(5000);
    return; // Tunggu koneksi sebelum melanjutkan
  }

  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
    cekWeb();
  }
}

void cekWeb() {
  HTTPClient http; // Membuat objek HTTPClient
  http.begin(websiteURL); // Inisialisasi request ke URL website

  int httpResponseCode = http.GET(); // Kirim HTTP GET request

  if (httpResponseCode > 0) {
    if (httpResponseCode >= 200 && httpResponseCode < 300) {
      // Status 2xx: Sukses
      Serial.println("Website CONNECT (Status: " + String(httpResponseCode) + " - OK)");
      bot.sendMessage(CHAT_ID, "Website CONNECT. Status: " + String(httpResponseCode) + " - OK");
    } else if (httpResponseCode >= 400 && httpResponseCode < 500) {
      // Status 4xx: Client Error
      Serial.println("Website ERROR (Status: " + String(httpResponseCode) + " - Client Error)");
      bot.sendMessage(CHAT_ID, "Website ERROR. Status: " + String(httpResponseCode) + " - Client Error. Periksa URL atau permintaan HTTP.");
    } else if (httpResponseCode >= 500 && httpResponseCode < 600) {
      // Status 5xx: Server Error
      Serial.println("Website ERROR (Status: " + String(httpResponseCode) + " - Server Error)");
      bot.sendMessage(CHAT_ID, "Website ERROR. Status: " + String(httpResponseCode) + " - Server Error. Masalah ada pada server.");
    } else {
      // Status lain-lain (non-standar)
      Serial.println("Website Status Tidak Dikenal (Status: " + String(httpResponseCode) + ")");
      bot.sendMessage(CHAT_ID, "Website Status Tidak Dikenal. Status: " + String(httpResponseCode));
    }
  } else {
    // Jika HTTP GET gagal
    Serial.println("Website DISCONNECT (Tidak dapat menghubungi server)");
    bot.sendMessage(CHAT_ID, "Website DISCONNECT. Tidak dapat menghubungi server. Periksa koneksi atau status website.");
  }

  http.end(); // Hentikan koneksi HTTP
}