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

// HX711 pins
HX711 scale;
const int DOUT = A1; // Data out
const int CLK = A0;  // Clock

// LCD Display
LiquidCrystal_I2C lcd(0x27, 16, 2);  // I2C address of the LCD
int buzzerPin = 7; // Buzzer pin
int buttonPin = 8; // Button to simulate sack removal

// Inventory variables
int stockCount = 10;  // Initial stock of cement sacks
const int safetyStock = 10;  // Minimum allowed stock before alert

void setup() {
  lcd.begin(16, 2);
  lcd.backlight();

  // Initialize the HX711
  scale.begin(DOUT, CLK);

  // Initialize pins
  pinMode(buzzerPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP); // Simulate sack removal with a button

  // Display initial stock
  lcd.setCursor(0, 0);
  lcd.print("Cement Sacks:");
  lcd.setCursor(0, 1);
  lcd.print(stockCount);
}

void loop() {
  // Simulate sack removal when button is pressed
  if (digitalRead(buttonPin) == LOW) {
    delay(300); // debounce delay
    stockCount--; // Decrease stock count
    lcd.setCursor(0, 1);
    lcd.print(stockCount); // Update stock count on LCD

    // Check if stock count is below safety level
    if (stockCount <= safetyStock) {
      digitalWrite(buzzerPin, HIGH); // Activate buzzer
      lcd.setCursor(0, 0);
      lcd.print("Alert: Low Stock");
    } else {
      digitalWrite(buzzerPin, LOW);  // Deactivate buzzer
      lcd.setCursor(0, 0);
      lcd.print("Cement Sacks: ");
    }
  }

  delay(500); // Delay for readability
}