// Smooth Page Transitions for Sky Art Shop
// Provides fade-out/fade-in effects when navigating between pages

(function () {
  "use strict";

  // Add page transition styles (less aggressive approach)
  const style = document.createElement("style");
  style.textContent = `
    body {
      transition: opacity 0.25s ease-in-out;
    }
    
    body.page-transitioning {
      opacity: 0;
      pointer-events: none;
    }
  `;
  document.head.appendChild(style);

  // Fade in page on load (if coming from a transition)
  function initPageTransition() {
    // Check if we're coming from a transition
    const isTransitioning = sessionStorage.getItem("page-transitioning");
    if (isTransitioning === "true") {
      document.body.style.opacity = "0";
      sessionStorage.removeItem("page-transitioning");

      // Wait for content to be ready, then fade in
      requestAnimationFrame(() => {
        requestAnimationFrame(() => {
          document.body.style.opacity = "1";
        });
      });
    }
  }

  // Handle navigation with transitions
  function setupNavigationTransitions() {
    // Get all internal links
    document.addEventListener("click", function (e) {
      const link = e.target.closest("a");

      if (!link) return;

      const href = link.getAttribute("href");

      // Skip if:
      // - External link
      // - Opens in new tab
      // - Has download attribute
      // - Is a hash link on same page
      // - Is a javascript: link
      // - Is a mailto: or tel: link
      if (
        !href ||
        link.target === "_blank" ||
        link.hasAttribute("download") ||
        href.startsWith("javascript:") ||
        href.startsWith("mailto:") ||
        href.startsWith("tel:") ||
        href.startsWith("#") ||
        (href.includes("://") && !href.includes(window.location.host))
      ) {
        return;
      }

      // Prevent default navigation
      e.preventDefault();

      // Start transition
      document.body.classList.add("page-transitioning");
      sessionStorage.setItem("page-transitioning", "true");

      // Navigate after fade-out completes
      setTimeout(() => {
        window.location.href = href;
      }, 250); // Match CSS transition duration
    });
  }

  // Use View Transitions API if available (Chrome 111+, Safari 18+)
  function setupViewTransitions() {
    if (!document.startViewTransition) return;

    document.addEventListener(
      "click",
      function (e) {
        const link = e.target.closest("a");

        if (!link) return;

        const href = link.getAttribute("href");

        // Same checks as above
        if (
          !href ||
          link.target === "_blank" ||
          link.hasAttribute("download") ||
          href.startsWith("javascript:") ||
          href.startsWith("mailto:") ||
          href.startsWith("tel:") ||
          href.startsWith("#") ||
          (href.includes("://") && !href.includes(window.location.host))
        ) {
          return;
        }

        e.preventDefault();

        // Use View Transitions API for smooth cross-page transitions
        sessionStorage.setItem("page-transitioning", "true");
        document.startViewTransition(() => {
          window.location.href = href;
        });
      },
      true
    ); // Use capture to run before other handlers
  }

  // Initialize
  if (document.readyState === "loading") {
    document.addEventListener("DOMContentLoaded", () => {
      initPageTransition();
      setupNavigationTransitions();
    });
  } else {
    initPageTransition();
    setupNavigationTransitions();
  }

  // For browsers that support View Transitions API (progressive enhancement)
  if ("startViewTransition" in document) {
    const viewStyle = document.createElement("style");
    viewStyle.textContent = `
      ::view-transition-old(root),
      ::view-transition-new(root) {
        animation-duration: 0.25s;
      }
    `;
    document.head.appendChild(viewStyle);
  }
})();