/* Slide Deck 16:9 Controller */
(function () {
  const container = document.getElementById('slideContainer');
  const slides = Array.from(container.querySelectorAll('.slide'));
  const prevBtn = document.getElementById('prevBtn');
  const nextBtn = document.getElementById('nextBtn');
  const dotsWrap = document.getElementById('dots');
  const progressBar = document.getElementById('progressBar');
  const themeToggle = document.getElementById('themeToggle');
  const fullscreenBtn = document.getElementById('fullscreenBtn');
  const replayBtn = document.getElementById('replayBtn');
  const copyBtn = document.getElementById('copyCode');
  const codeSample = document.getElementById('codeSample');

  const state = {
    index: 0,
    total: slides.length
  };

  // Build dots
  slides.forEach((_, i) => {
    const dot = document.createElement('button');
    dot.className = 'dot' + (i === 0 ? ' is-active' : '');
    dot.setAttribute('role', 'tab');
    dot.setAttribute('aria-label', `Ir para slide ${i + 1}`);
    dot.addEventListener('click', () => goTo(i));
    dotsWrap.appendChild(dot);
  });

  const dots = Array.from(dotsWrap.querySelectorAll('.dot'));

  function updateUI() {
    slides.forEach((s, i) => s.classList.toggle('is-active', i === state.index));
    dots.forEach((d, i) => d.classList.toggle('is-active', i === state.index));
    prevBtn.disabled = state.index === 0;
    nextBtn.disabled = state.index === state.total - 1;
    progressBar.style.width = `${((state.index + 1) / state.total) * 100}%`;
    // Announce for a11y
    const activeSlide = slides[state.index];
    activeSlide?.setAttribute('aria-label', `Slide ${state.index + 1} de ${state.total}`);
  }

  function next() {
    if (state.index < state.total - 1) {
      state.index++;
      updateUI();
    }
  }

  function prev() {
    if (state.index > 0) {
      state.index--;
      updateUI();
    }
  }

  function goTo(i) {
    state.index = Math.max(0, Math.min(state.total - 1, i));
    updateUI();
  }

  // Events
  nextBtn.addEventListener('click', next);
  prevBtn.addEventListener('click', prev);

  document.addEventListener('keydown', (e) => {
    if (e.key === 'ArrowRight' || e.key === 'PageDown') {
      e.preventDefault();
      next();
    } else if (e.key === 'ArrowLeft' || e.key === 'PageUp') {
      e.preventDefault();
      prev();
    } else if (e.key === 'Home') {
      e.preventDefault();
      goTo(0);
    } else if (e.key === 'End') {
      e.preventDefault();
      goTo(state.total - 1);
    }
  });

  // Touch swipe
  let touchStartX = null;
  container.addEventListener('touchstart', (e) => {
    touchStartX = e.changedTouches[0].clientX;
  }, { passive: true });

  container.addEventListener('touchend', (e) => {
    if (touchStartX === null) return;
    const dx = e.changedTouches[0].clientX - touchStartX;
    if (Math.abs(dx) > 40) {
      dx < 0 ? next() : prev();
    }
    touchStartX = null;
  }, { passive: true });

  // Theme toggle (undefined mode -> light by default)
  themeToggle.addEventListener('click', () => {
    const wrapper = document.querySelector('.theme-wrapper');
    wrapper.classList.toggle('dark');
    themeToggle.innerHTML = wrapper.classList.contains('dark')
      ? '<i data-feather="moon"></i>'
      : '<i data-feather="sun"></i>';
    if (window.feather) feather.replace();
  });

  // Fullscreen
  function toggleFullscreen() {
    const elem = document.documentElement;
    if (!document.fullscreenElement) {
      (elem.requestFullscreen || elem.webkitRequestFullscreen || elem.msRequestFullscreen)?.call(elem);
    } else {
      (document.exitFullscreen || document.webkitExitFullscreen || document.msExitFullscreen)?.call(document);
    }
  }
  fullscreenBtn.addEventListener('click', toggleFullscreen);
  document.addEventListener('fullscreenchange', () => {
    fullscreenBtn.innerHTML = document.fullscreenElement
      ? '<i data-feather="minimize"></i>'
      : '<i data-feather="maximize"></i>';
    if (window.feather) feather.replace();
  });

  // Replay / CTA shortcuts
  document.getElementById('startSlides')?.addEventListener('click', () => goTo(1));
  document.getElementById('viewSamples')?.addEventListener('click', () => goTo(2));
  document.getElementById('replayBtn')?.addEventListener('click', () => goTo(0));
  document.getElementById('contactBtn')?.addEventListener('click', (e) => {
    e.preventDefault();
    alert('Obrigado! Vamos conversarei em breve.');
  });

  // Copy code
  copyBtn?.addEventListener('click', async () => {
    try {
      await navigator.clipboard.writeText(codeSample?.textContent || '');
      copyBtn.innerHTML = '<i data-feather="check"></i>';
      if (window.feather) feather.replace();
      setTimeout(() => {
        copyBtn.innerHTML = '<i data-feather="copy"></i>';
        if (window.feather) feather.replace();
      }, 1200);
    } catch (_) {}
  });

  // Init icons and UI
  if (window.feather) feather.replace();
  updateUI();
})();