#include "HX711.h"
#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);
HX711 scale;

#define BTN_UP    2
#define BTN_DOWN  3
#define BTN_OK    4

float hargaPerKg = 0;
bool modeSetHarga = false;
unsigned long lastDebounce = 0;
const unsigned long debounceDelay = 200;

void setup() {
  lcd.init();
  lcd.backlight();
  Serial.begin(9600);
  scale.begin(A1, A0); 
  scale.set_scale();
  scale.tare();

  pinMode(BTN_UP, INPUT_PULLUP);
  pinMode(BTN_DOWN, INPUT_PULLUP);
  pinMode(BTN_OK, INPUT_PULLUP);
}

void loop() {
  long rawValue = scale.get_value();
  float berat = rawValue / 420.0;
  float totalHarga = berat * hargaPerKg;

  if (millis() - lastDebounce > debounceDelay) {
    if (digitalRead(BTN_OK) == LOW) {
      modeSetHarga = !modeSetHarga;
      lastDebounce = millis();
    }

    if (modeSetHarga) {
      if (digitalRead(BTN_UP) == LOW && hargaPerKg < 50000) {
        hargaPerKg += 500;
        lastDebounce = millis();
      }
      if (digitalRead(BTN_DOWN) == LOW && hargaPerKg > 1000) {
        hargaPerKg -= 500;
        lastDebounce = millis();
      }
    }
  }

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Berat    : ");
  lcd.print(berat); 
  lcd.print(" kg");

  lcd.setCursor(0, 1);
  lcd.print("Harga/kg : Rp");
  lcd.print(hargaPerKg, 0);

  lcd.setCursor(0, 2);
  lcd.print("Total    : Rp");
  lcd.print(totalHarga, 0);

  lcd.setCursor(0, 3);
  if (modeSetHarga) {
    lcd.print(" > MODE SET HARGA <");
  } else {
    lcd.print(" Tekan OK utk ubah ");
  }

  delay(1000);
}