// Back to Top Button functionality
let backToTopBtn;

function handleScroll() {
  if (window.pageYOffset > 300) {
    backToTopBtn.classList.remove('opacity-0', 'invisible');
    backToTopBtn.classList.add('opacity-100', 'visible');
  } else {
    backToTopBtn.classList.remove('opacity-100', 'visible');
    backToTopBtn.classList.add('opacity-0', 'invisible');
  }
}

function scrollToTop() {
  window.scrollTo({
    top: 0,
    behavior: 'smooth'
  });
}

export function init() {
  // Initialize back to top button
  backToTopBtn = document.getElementById('backToTopBtn');
  
  if (backToTopBtn) {
    // Show/hide button based on scroll position
    window.addEventListener('scroll', handleScroll);
    
    // Add click event listener
    backToTopBtn.addEventListener('click', scrollToTop);
    
    // Initial check
    handleScroll();
  }
}

export function teardown() {
  if (backToTopBtn) {
    window.removeEventListener('scroll', handleScroll);
    backToTopBtn.removeEventListener('click', scrollToTop);
  }
}