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

// ✅ Pin GPIO
#define BUTTON_FRONT 4
#define BUTTON_REAR 5
#define BUTTON_RESET 32
#define LED_FRONT 18
#define LED_REAR 19

int frontCount = 0;
int rearCount = 0;
bool prevFrontState = LOW;
bool prevRearState = LOW;
bool prevResetState = HIGH; // HIGH sebab guna INPUT_PULLUP

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  pinMode(BUTTON_FRONT, INPUT);
  pinMode(BUTTON_REAR, INPUT);
  pinMode(BUTTON_RESET, INPUT_PULLUP); // ✅ penting
  pinMode(LED_FRONT, OUTPUT);
  pinMode(LED_REAR, OUTPUT);

  lcd.init();
  lcd.backlight();
  updateLCD();
}

void loop() {
  bool frontState = digitalRead(BUTTON_FRONT);
  bool rearState = digitalRead(BUTTON_REAR);
  bool resetState = digitalRead(BUTTON_RESET); // Akan LOW bila ditekan

  // Front Brake
  if (frontState == HIGH && prevFrontState == LOW) {
    digitalWrite(LED_FRONT, HIGH);
  } else if (frontState == LOW && prevFrontState == HIGH) {
    frontCount++;
    updateLCD();
    digitalWrite(LED_FRONT, LOW);
  }
  prevFrontState = frontState;

  // Rear Brake
  if (rearState == HIGH && prevRearState == LOW) {
    digitalWrite(LED_REAR, HIGH);
  } else if (rearState == LOW && prevRearState == HIGH) {
    rearCount++;
    updateLCD();
    digitalWrite(LED_REAR, LOW);
  }
  prevRearState = rearState;

  // ✅ External Reset (active LOW)
  if (resetState == LOW && prevResetState == HIGH) {
    resetCounts();
  }
  prevResetState = resetState;

  delay(10);
}

void updateLCD() {
  lcd.setCursor(0, 0);
  lcd.print("Front: ");
  lcd.print(frontCount);
  lcd.print("   ");
  lcd.setCursor(0, 1);
  lcd.print("Rear : ");
  lcd.print(rearCount);
  lcd.print("   ");
}

void resetCounts() {
  frontCount = 0;
  rearCount = 0;
  updateLCD();

  digitalWrite(LED_FRONT, HIGH);
  digitalWrite(LED_REAR, HIGH);
  for (int i = 0; i < 3; i++) {
    lcd.noBacklight();
    delay(200);
    lcd.backlight();
    delay(200);
  }
  digitalWrite(LED_FRONT, LOW);
  digitalWrite(LED_REAR, LOW);
}