/* desfoto.de - progressive enhancement only. */
(function () {
  'use strict';

  /* Mobile navigation */
  var toggle = document.querySelector('[data-nav-toggle]');
  var nav = document.getElementById('site-nav');
  if (toggle && nav) {
    toggle.addEventListener('click', function () {
      var open = nav.classList.toggle('is-open');
      toggle.setAttribute('aria-expanded', open ? 'true' : 'false');
    });
    nav.addEventListener('click', function (event) {
      if (event.target.closest('a') && window.innerWidth < 832) {
        nav.classList.remove('is-open');
        toggle.setAttribute('aria-expanded', 'false');
      }
    });
  }

  /* Click-to-load YouTube (youtube-nocookie) */
  document.querySelectorAll('[data-video-id]').forEach(function (facade) {
    facade.addEventListener('click', function () {
      var id = facade.getAttribute('data-video-id');
      var iframe = document.createElement('iframe');
      iframe.setAttribute('src', 'https://www.youtube-nocookie.com/embed/' + encodeURIComponent(id) +
        '?autoplay=1&rel=0&modestbranding=1&playsinline=1');
      iframe.setAttribute('title', facade.getAttribute('aria-label') || 'Video');
      iframe.setAttribute('loading', 'eager');
      iframe.setAttribute('allow', 'accelerometer; clipboard-write; encrypted-media; gyroscope; picture-in-picture');
      iframe.setAttribute('allowfullscreen', '');
      iframe.setAttribute('referrerpolicy', 'strict-origin-when-cross-origin');
      var shell = facade.parentElement;
      shell.replaceChild(iframe, facade);
      iframe.focus();
    });
  });

  /* Contact form -> local mail draft, nothing is transmitted by this page */
  var form = document.querySelector('[data-contact-form]');
  if (form) {
    var status = form.querySelector('[data-contact-status]');
    form.addEventListener('submit', function (event) {
      event.preventDefault();
      var data = new FormData(form);
      var name = (data.get('name') || '').toString().trim();
      var email = (data.get('email') || '').toString().trim();
      var topic = (data.get('topic') || '').toString().trim();
      var date = (data.get('date') || '').toString().trim();
      var message = (data.get('message') || '').toString().trim();
      if (!name || !email || !message) {
        if (status) {
          status.hidden = false;
          status.textContent = 'Bitte Name, E-Mail und Nachricht ausfüllen.';
          status.style.color = '#95330F';
        }
        return;
      }
      var subject = 'Anfrage über desfoto.de: ' + topic;
      var body = 'Name: ' + name + '\nE-Mail: ' + email + '\nBereich: ' + topic +
        (date ? '\nWunschtermin: ' + date : '') + '\n\n' + message + '\n';
      window.location.href = 'mailto:info@dennyschulz.de?subject=' +
        encodeURIComponent(subject) + '&body=' + encodeURIComponent(body);
      if (status) {
        status.hidden = false;
        status.textContent = 'Dein Mailprogramm sollte sich mit dem fertigen Entwurf öffnen.';
        status.style.color = '';
      }
    });
  }

  /* Motion layer: reveals, scroll progress, parallax and pointer spotlights.
     Everything degrades to a static page and is disabled for reduced motion. */
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;

  /* Anything inside [data-stagger] reveals one item after another. */
  Array.prototype.forEach.call(document.querySelectorAll('[data-stagger]'), function (group) {
    var step = parseFloat(group.getAttribute('data-stagger')) || 0.08;
    Array.prototype.forEach.call(group.children, function (child, index) {
      if (!child.classList.contains('reveal')) {
        child.classList.add('reveal');
      }
      child.style.setProperty('--d', (index * step).toFixed(2) + 's');
    });
  });

  var items = document.querySelectorAll('.reveal');
  var revealAll = function () {
    Array.prototype.forEach.call(items, function (item) { item.classList.add('is-in'); });
  };
  if (reduce || !('IntersectionObserver' in window)) {
    revealAll();
  } else {
    try {
      var fired = 0;
      var observer = new IntersectionObserver(function (entries) {
        entries.forEach(function (entry) {
          if (entry.isIntersecting) {
            fired = 1;
            entry.target.classList.add('is-in');
            observer.unobserve(entry.target);
          }
        });
      }, { rootMargin: '0px 0px -8% 0px', threshold: 0.06 });
      Array.prototype.forEach.call(items, function (item) { observer.observe(item); });
      /* Safety net: if the browser never reports a box that is on screen, drop the
         effect entirely instead of leaving content hidden. */
      window.setTimeout(function () {
        if (fired) { return; }
        var onScreen = false;
        Array.prototype.forEach.call(items, function (item) {
          var box = item.getBoundingClientRect();
          if (box.top < window.innerHeight && box.bottom > 0) { onScreen = true; }
        });
        if (onScreen) {
          observer.disconnect();
          revealAll();
        }
      }, 1600);
    } catch (error) {
      revealAll();
    }
  }

  if (reduce) {
    return;
  }

  var progress = document.querySelector('[data-progress]');
  var parallax = Array.prototype.slice.call(document.querySelectorAll('[data-parallax]'));
  var ticking = false;

  function onScroll() {
    var doc = document.documentElement;
    var max = doc.scrollHeight - window.innerHeight;
    var ratio = max > 0 ? Math.min(1, Math.max(0, window.scrollY / max)) : 0;
    if (progress) {
      progress.style.setProperty('--scroll', ratio.toFixed(4));
    }
    if (parallax.length) {
      var view = window.innerHeight;
      parallax.forEach(function (element) {
        var rect = element.getBoundingClientRect();
        if (rect.bottom < -240 || rect.top > view + 240) {
          return;
        }
        var speed = parseFloat(element.getAttribute('data-parallax')) || 0.12;
        var offset = (rect.top + rect.height / 2 - view / 2) * speed;
        element.style.setProperty('--py', offset.toFixed(1) + 'px');
      });
    }
    ticking = false;
  }

  function requestScroll() {
    if (!ticking) {
      ticking = true;
      window.requestAnimationFrame(onScroll);
    }
  }

  window.addEventListener('scroll', requestScroll, { passive: true });
  window.addEventListener('resize', requestScroll);
  onScroll();

  /* Pointer-following highlight on the media cards. */
  Array.prototype.forEach.call(document.querySelectorAll('.spot'), function (card) {
    card.addEventListener('pointermove', function (event) {
      var rect = card.getBoundingClientRect();
      card.style.setProperty('--mx', ((event.clientX - rect.left) / rect.width * 100).toFixed(1) + '%');
      card.style.setProperty('--my', ((event.clientY - rect.top) / rect.height * 100).toFixed(1) + '%');
    });
  });
}());