#define BLYNK_TEMPLATE_ID "TMPL6Rk-Po8Vk"
#define BLYNK_TEMPLATE_NAME "BMI"
#define BLYNK_AUTH_TOKEN "7hRQKr3JmMEOZgEQnQsYlbKZf0ktsOMW"

#include <WiFi.h>
#include <BlynkSimpleEsp32.h> // Library Blynk untuk ESP32
#include "HX711.h"
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Ultrasonic
#define TRIG_PIN 12
#define ECHO_PIN 14

// LCD
LiquidCrystal_I2C lcd(0x27, 16, 2);

// HX711
HX711 scale;
uint8_t dataPin = 2;
uint8_t clockPin = 4;

// Wi-Fi credentials
char ssid[] = "Wokwi-GUEST";       // Ganti dengan SSID Wi-Fi
char pass[] = "";   // Ganti dengan Password Wi-Fi

void setup() {
  // Serial Monitor
  Serial.begin(115200);

  // Blynk Initialization
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

  // LCD Initialization
  lcd.init();
  lcd.backlight();

  // Ultrasonic Initialization
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  // HX711 Initialization
  scale.begin(dataPin, clockPin);
  scale.set_offset(4294963012);
  scale.set_scale(25.637112);
  scale.tare(10);

  // Splash Screen
  lcd.setCursor(0, 0);
  lcd.print("BMI");
  delay(1000);
  lcd.clear();
}

void loop() {
  Blynk.run(); // Jalankan koneksi ke Blynk
  
  // Membaca data sensor
  int height = ultrasonicRead();
  int weight = loadcell();
  float bmi = calculateBMI(height, weight);
  String category = getBMICategory(bmi);

  // Tampilkan hasil di LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("BMI:");
  lcd.print(bmi);
  lcd.setCursor(0, 1);
  lcd.print(category);

  // Kirim data ke Blynk
  Blynk.virtualWrite(V0, height);         // Kirim BMI ke Virtual Pin V0
  Blynk.virtualWrite(V1, weight);     // Kirim tinggi ke Virtual Pin V1
  Blynk.virtualWrite(V2, bmi);     // Kirim berat ke Virtual Pin V2

  delay(1000);
}

int loadcell() {
  if (scale.is_ready()) {
    int unitkg = scale.get_units(1) / 1000;
    return unitkg > 0 ? unitkg : 45;
  } else {
    return 0;
  }
}

int ultrasonicRead() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  long duration = pulseIn(ECHO_PIN, HIGH);
  float distance = (duration * 0.0343) / 2;
  return distance > 0 ? (int)distance : 0;
}

float calculateBMI(int height, int weight) {
  if (height > 0) {
    float heightM = height / 100.0;
    return weight / (heightM * heightM);
  }
  return 0;
}

String getBMICategory(float bmi) {
  if (bmi < 18.5) {
    return "Underweight";
  } else if (bmi >= 18.5 && bmi <= 24.9) {
    return "Healthy";
  } else if (bmi >= 25.0 && bmi <= 29.9) {
    return "Overweight";
  } else {
    return "Obese";
  }
}