#include <WiFi.h>
#include <WiFiClientSecure.h>
#include <UniversalTelegramBot.h>
#include <ArduinoJson.h>
#include <DHT.h>
#include "time.h"

// ================== WIFI ==================
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// ================== TELEGRAM ==================
#define BOT_TOKEN "8756996903:AAExGSLxqXuAr8ws7rSCBpNNvxvlirYAc10"
#define CHAT_ID "7829056748"

WiFiClientSecure client;
UniversalTelegramBot bot(BOT_TOKEN, client);

// ================== DHT ==================
#define DHTPIN 15
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// ================== OUTPUT ==================
#define BUZZER 4
#define LED_MERAH 16
#define LED_KUNING 17
#define LED_HIJAU 5

// ================== TIME (WIB) ==================
const char* ntpServer = "pool.ntp.org";
const long gmtOffset_sec = 7 * 3600; // WIB = UTC+7
const int daylightOffset_sec = 0;

// Status terakhir
String lastStatus = "";

// ================== SETUP ==================
void setup() {
  Serial.begin(115200);

  dht.begin();

  pinMode(BUZZER, OUTPUT);
  pinMode(LED_MERAH, OUTPUT);
  pinMode(LED_KUNING, OUTPUT);
  pinMode(LED_HIJAU, OUTPUT);

  // WiFi
  WiFi.begin(ssid, password);
  Serial.print("Menghubungkan WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi Terhubung");

  client.setInsecure(); // supaya HTTPS jalan

  // Time
  configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);

  bot.sendMessage(CHAT_ID, "✅ Sistem Cold Storage Aktif", "");
}

// ================== AMBIL WAKTU ==================
String getTime() {
  struct tm timeinfo;
  if (!getLocalTime(&timeinfo)) {
    return "Waktu gagal";
  }

  char buffer[50];
  strftime(buffer, sizeof(buffer), "%A, %d-%m-%Y %H:%M:%S WIB", &timeinfo);
  return String(buffer);
}

// ================== LOOP ==================
void loop() {
  float suhu = dht.readTemperature();

  if (isnan(suhu)) {
    Serial.println("Sensor Error!");
    return;
  }

  String status;
  String pesan;

  // ================== KONDISI ==================
  if (suhu > 5.0) {
    status = "BAHAYA";

    digitalWrite(BUZZER, HIGH);
    digitalWrite(LED_MERAH, HIGH);
    digitalWrite(LED_KUNING, LOW);
    digitalWrite(LED_HIJAU, LOW);

  } else if (suhu >= 2.0) {
    status = "WASPADA";

    digitalWrite(BUZZER, LOW);
    digitalWrite(LED_MERAH, LOW);
    digitalWrite(LED_KUNING, HIGH);
    digitalWrite(LED_HIJAU, LOW);

  } else {
    status = "NORMAL";

    digitalWrite(BUZZER, LOW);
    digitalWrite(LED_MERAH, LOW);
    digitalWrite(LED_KUNING, LOW);
    digitalWrite(LED_HIJAU, HIGH);
  }

  // ================== KIRIM TELEGRAM ==================
  if (status != lastStatus) {
    String waktu = getTime();

    pesan = "📢 NOTIFIKASI COLD STORAGE\n\n";
    pesan += "🕒 Waktu : " + waktu + "\n";
    pesan += "🌡 Suhu  : " + String(suhu) + " °C\n";
    pesan += "⚠ Status: " + status + "\n\n";

    if (status == "BAHAYA") {
      pesan += "🚨 SUHU TERLALU TINGGI!";
    } else if (status == "WASPADA") {
      pesan += "⚠ Perlu perhatian";
    } else {
      pesan += "✅ Kondisi aman";
    }

    bot.sendMessage(CHAT_ID, pesan, "");

    lastStatus = status;
  }

  delay(3000);
}