/**
 * Feature Section Card Animator
 * Staggered scroll-reveal entrance + icon pop-in for .feature-section cards.
 * Coordinates with the main.js scroll-hidden/visible system:
 *   1. Sets --scroll-delay CSS custom property on each card so main.js's
 *      scroll-visible transition fires at staggered intervals.
 *   2. Uses MutationObserver to detect when scroll-visible is applied, then
 *      triggers the icon-pop animation on the card's .feature-icon.
 *   3. Resets the delay to 0s after the entrance so hover interactions stay snappy.
 */
(function () {
  'use strict';

  var STAGGER = 0.08; // seconds between each card's entrance

  document.addEventListener('DOMContentLoaded', function () {
    if (window.matchMedia('(prefers-reduced-motion: reduce)').matches) return;

    // 1. Assign incrementing --scroll-delay to every card within a feature-section.
    //    The block renders .grid-2/.grid-3/.grid-4 wrappers (no .feature-section class).
    //    main.js's .scroll-visible rule reads this via var(--scroll-delay, 0s).
    document.querySelectorAll('.grid-2, .grid-3, .grid-4').forEach(function (grid) {
      grid.querySelectorAll('.oribi-card').forEach(function (card, i) {
        card.style.setProperty('--scroll-delay', (i * STAGGER).toFixed(2) + 's');
      });
    });

    // 2. Watch for scroll-visible being added to each card.
    var cards = document.querySelectorAll('.grid-2 .oribi-card, .grid-3 .oribi-card, .grid-4 .oribi-card');
    if (!cards.length) return;

    var mo = new MutationObserver(function (mutations) {
      mutations.forEach(function (m) {
        var card = m.target;
        if (!card.classList.contains('scroll-visible')) return;

        mo.unobserve(card);

        // Trigger icon pop ~150ms after the card itself starts fading in.
        var icon = card.querySelector('.feature-icon');
        if (icon) {
          var cardDelay = parseFloat(card.style.getPropertyValue('--scroll-delay')) || 0;
          icon.style.animationDelay = (cardDelay + 0.15).toFixed(2) + 's';
          icon.classList.add('icon-pop');
          icon.addEventListener('animationend', function () {
            icon.classList.remove('icon-pop');
            icon.style.animationDelay = '';
            // Start ambient float+ring animation once the pop-in finishes.
            card.classList.add('is-animated');
          }, { once: true });
        }

        // Reset stagger delay after entrance transition so hover isn't delayed.
        card.addEventListener('transitionend', function (e) {
          if (e.propertyName === 'opacity') {
            card.style.setProperty('--scroll-delay', '0s');
          }
        }, { once: true });
      });
    });

    cards.forEach(function (card) {
      mo.observe(card, { attributes: true, attributeFilter: ['class'] });
    });
  });
}());