// Навигация флипбука
let currentPage = 3;
const totalPages = 6;
const flipbookContainer = document.querySelector('.flipbook-container');
const pages = document.querySelectorAll('.flipbook-page');
const indicator = document.querySelector('.flipbook-indicator');

let startTranslateX = 0; // Initial translateX of the active page
const pageSpacing = 16 * 1; // 1rem margin on each side of the page (0.5rem * 2)

function updatePages() {
  pages.forEach(page => {
    const pageNum = parseInt(page.dataset.page);
    const diff = pageNum - currentPage;

    // Apply original classes for animation on both mobile and desktop
    page.classList.remove('active', 'left', 'right', 'far-left', 'far-right', 'far-far-right', 'far-far-left');
    if (diff === 0) {
      page.classList.add('active');
    } else if (diff === -1) {
      page.classList.add('left');
    } else if (diff === -2) {
      page.classList.add('far-left');
    } else if (diff === -3) {
      page.classList.add('far-far-left');
    } else if (diff === 1) {
      page.classList.add('right');
    } else if (diff === 2) {
      page.classList.add('far-right');
    } else if (diff === 3) {
      page.classList.add('far-far-right');
    }

    // Calculate and apply translateX for each page based on its position relative to the active page
    // This is the core change for custom scrolling
    let translateX;
    // Calculate horizontal translation for each page
    if (window.innerWidth <= 768) {
      // Mobile: Adjusted translateX with tighter spacing
      translateX = (pageNum - currentPage) * (page.offsetWidth * 0.6 + pageSpacing) - 15;
      // Centering is handled by flexbox on the container
    } else {
      // Desktop: Adjusted translateX for spacing and to contribute to the curve effect
      // Multiplier (0.9) controls horizontal spacing between pages
      const desktopSpacing = page.offsetWidth * 0.9 + pageSpacing;
      translateX = (pageNum - currentPage) * desktopSpacing;
      // Centering is handled by flexbox on the container
    }


    // Apply combined transform: translateX, rotateY (for flip effect), and scale (for perspective)
    // rotateY: Controls the rotation around the Y-axis (the "flip")
    // Multipliers (12 for mobile, 20 for desktop) control the degree of rotation per page difference
    // scale: Controls the size of the page, creating a perspective effect
    // Multipliers (0.08 for mobile, 0.05 for desktop) control how much smaller pages get further away
    page.style.transform = `translateX(${translateX}px) rotateY(${diff * (window.innerWidth <= 768 ? 12 : 20)}deg) scale(${1 - Math.abs(diff) * (window.innerWidth <= 768 ? 0.08 : 0.05)})`;

    // Adjust z-index based on distance from active page to control stacking order
    page.style.zIndex = totalPages - Math.abs(diff);

    // Adjust opacity based on distance to create a fading effect for far pages
    // Multipliers (0.15 for mobile, 0.1 for desktop) control how much pages fade
    page.style.opacity = 1 - Math.abs(diff) * (window.innerWidth <= 768 ? 0.15 : 0.1);
  });

  // Update indicator position
  let position;
  if (window.innerWidth <= 768) {
    // Indicator position for mobile (centered)
    position = ((currentPage - 1) / (totalPages - 1)) * 100 - 50;
  } else {
    // Indicator position for desktop (adjusted for wider range)
    position = ((currentPage - 1) / (totalPages - 1)) * 200 - 100;
  }
  indicator.style.transform = `translateX(${position}%)`;
}

// Click navigation (keep original logic)
pages.forEach(page => {
  page.addEventListener('click', (e) => {
    if (!page.classList.contains('active')) {
      currentPage = parseInt(page.dataset.page);
      updatePages();
    }
  });
});

// Mouse hover navigation (keep original logic)
let hoverTimer;
pages.forEach(page => {
  page.addEventListener('mouseenter', () => {
    if (!page.classList.contains('active')) {
      clearTimeout(hoverTimer);
      hoverTimer = setTimeout(() => {
        currentPage = parseInt(page.dataset.page);
        updatePages();
      }, 300);
    }
  });

  page.addEventListener('mouseleave', () => {
    clearTimeout(hoverTimer);
  });
});

// Touch swipe detection (removed for mobile as per user request)
// The following touch event listeners and related variables are removed.
// Navigation on mobile will now be handled by clicking on the cards.

// Handle window resize to switch between mobile/desktop layouts
window.addEventListener('resize', updatePages);

// Initialize
updatePages();

// Product details data - will be populated from HTML
const productDetails = {};

// Initialize product details from data attributes
function initProductDetails() {
  const productElements = document.querySelectorAll('.flipbook-page');
  productElements.forEach(page => {
    const pageNum = parseInt(page.dataset.page);
    const title = page.querySelector('.product-title').textContent;
    const description = page.querySelector('.product-description').textContent;
    productDetails[pageNum] = { title, description };
  });
}

// Product details functionality moved to products.html
// This file only handles flipbook navigation
updatePages();