#include <WiFi.h>
#include <PubSubClient.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqttServer = "mqttmuti.sija-bridge.tech";
const int mqttPort = 1808;

const int photoDiodePin = 34; // Pin analog untuk fotodioda

WiFiClient espClient;
PubSubClient client(espClient);
LiquidCrystal_I2C lcd(0x27, 16, 2); 
void setup() {
  lcd.init();
  lcd.backlight();
  Serial.begin(115200);

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  client.setServer(mqttServer, mqttPort);
  while (!client.connected()) {
    Serial.println("Connecting to MQTT...");
    if (client.connect("ESP32Client")) {
      Serial.println("Connected to MQTT");
    } else {
      Serial.print("Failed with state ");
      Serial.print(client.state());
      delay(2000);
    }
  }

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("GLUCOLINK Ready");
}

void loop() {
  int sensorValue = analogRead(photoDiodePin);
  float voltage = sensorValue * (3.3 / 4095.0); // Konversi nilai sensor ke tegangan
  float glucoseLevel = calculateGlucose(voltage); // Fungsi untuk menghitung kadar gula darah

  Serial.print("Gula Darah: ");
  Serial.print(glucoseLevel);
  Serial.println(" mg/dl");

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Kadar Gula Darah:");
  lcd.setCursor(0, 1);
  lcd.print(glucoseLevel);
  lcd.print(" mg/dl");

  // Kirim data ke MQTT
  String payload = String(glucoseLevel);
  client.publish("glunode/level", payload.c_str());

  delay(5000); // Tunggu 5 detik sebelum melakukan pengukuran berikutnya
}

float calculateGlucose(float voltage) {
  // Fungsi untuk mengkonversi tegangan ke kadar gula darah
  // Ini adalah contoh sederhana, sesuaikan dengan hasil kalibrasi yang kamu miliki
  return voltage * 100; // Contoh konversi, sesuaikan dengan kebutuhan
}