#define BLYNK_TEMPLATE_ID "TMPL4rGR9Tw_T"
#define BLYNK_TEMPLATE_NAME "lab4"
#define BLYNK_AUTH_TOKEN "jEyTnhs8j6PABePISF_wHIvD74EfqyzM"

#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <AESLib.h>

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

// AES
AESLib aesLib;

// AES-128 ключ
byte aesKey[] = {
    0x2b, 0x7e, 0x15, 0x16,
    0x28, 0xae, 0xd2, 0xa6,
    0x61, 0x37, 0x10, 0x56,
    0x72, 0x6b, 0x5c, 0x27};

// Фіксований IV
byte aesIv[16] = {
    0, 1, 2, 3,
    4, 5, 6, 7,
    8, 9, 10, 11,
    12, 13, 14, 15};

// LDR pin
const int sensorPin = 34;

// Буфери
char dataToEncrypt[16];
byte encrypted[64];
char encryptedHex[128];

BlynkTimer timer;

void sendEncryptedData()
{

  // ===== Зчитування освітленості =====

  const float GAMMA = 0.7;
  const float RL10 = 33;

  int analogValue = analogRead(sensorPin);

  float voltage = analogValue / 4096.0 * 3.3;

  float resistance =
      2000 * voltage / (1 - voltage / 3.3);

  float lightValue =
      pow(RL10 * 1e3 * pow(10, GAMMA) / resistance,
          (1 / GAMMA));

  // ===== float -> text =====

  sprintf(dataToEncrypt, "%.2f", lightValue);

  // ===== AES encryption =====

  uint16_t encryptedLength = aesLib.encrypt(
      (byte *)dataToEncrypt,
      strlen(dataToEncrypt),
      encrypted,
      aesKey,
      128,
      aesIv);

  // ===== bytes -> HEX =====

  encryptedHex[0] = '\0';

  for (int i = 0; i < encryptedLength; i++)
  {

    char temp[4];

    sprintf(temp, "%02X", encrypted[i]);

    strcat(encryptedHex, temp);
  }

  // ===== Serial =====

  Serial.print("Original value: ");
  Serial.println(lightValue);

  Serial.print("Encrypted HEX: ");
  Serial.println(encryptedHex);

  // ===== Send to Blynk =====

  Blynk.virtualWrite(V0, encryptedHex);

  Serial.println("Encrypted data sent");
  Serial.println("---------------------------");
}

void setup()
{

  Serial.begin(115200);

  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

  timer.setInterval(3000L, sendEncryptedData);

  Serial.println("AES Sender Ready");
}

void loop()
{

  Blynk.run();

  timer.run();
}