'use strict';
(() => {
  const timers = new WeakMap();
  const status = document.getElementById('copy-status');
  let statusTimer;
  document.querySelectorAll('[data-copy-target]').forEach(button => {
    button.addEventListener('click', async () => {
      const target = document.getElementById(button.dataset.copyTarget);
      if (!target || button.disabled) return;
      button.disabled = true;
      button.setAttribute('aria-busy', 'true');
      const original = button.dataset.originalText || button.textContent;
      button.dataset.originalText = original;
      let success = false;
      try {
        await navigator.clipboard.writeText(target.textContent);
        success = true;
      } catch {
        const field = document.createElement('textarea');
        field.value = target.textContent;
        field.setAttribute('readonly', '');
        field.style.cssText = 'position:fixed;opacity:0;top:0;left:0;pointer-events:none';
        document.body.appendChild(field);
        field.select();
        try { success = document.execCommand('copy'); } catch { /* Keep the manual copy fallback visible. */ }
        field.remove();
        button.focus({preventScroll:true});
      }
      clearTimeout(timers.get(button));
      clearTimeout(statusTimer);
      button.dataset.copyState = success ? 'success' : 'error';
      button.textContent = success ? '已复制 ✓' : '请手动复制';
      if (status) status.textContent = success ? '已复制到剪贴板' : '复制失败，请选中命令后手动复制';
      timers.set(button, setTimeout(() => {
        button.textContent = original;
        delete button.dataset.copyState;
      }, 2200));
      statusTimer = setTimeout(() => { if (status) status.textContent = ''; }, 2600);
      button.disabled = false;
      button.removeAttribute('aria-busy');
    });
  });

  const themeButton = document.querySelector('.docs-theme');
  const updateThemeButton = () => {
    const dark = document.documentElement.classList.contains('dark');
    themeButton?.setAttribute('aria-pressed', String(dark));
    themeButton?.setAttribute('aria-label', dark ? '切换为浅色主题' : '切换为深色主题');
    themeButton?.setAttribute('title', dark ? '切换为浅色主题' : '切换为深色主题');
  };
  updateThemeButton();
  themeButton?.addEventListener('click', () => {
    const dark = document.documentElement.classList.toggle('dark');
    try { localStorage.setItem('newapi:theme:v1:mode', dark ? 'dark' : 'light'); } catch { /* Theme still works without storage. */ }
    updateThemeButton();
  });

  if (!('IntersectionObserver' in window)) return;
  const reduced = window.matchMedia('(prefers-reduced-motion: reduce)');
  if (!reduced.matches) {
    const reveal = new IntersectionObserver(entries => {
      entries.forEach(entry => {
        if (!entry.isIntersecting) return;
        entry.target.classList.add('is-revealed');
        reveal.unobserve(entry.target);
      });
    }, {threshold: 0.06});
    document.querySelectorAll('[data-docs-reveal]').forEach(panel => reveal.observe(panel));
  }
  const links = [...document.querySelectorAll('.toc a[href^="#"]')];
  const sections = links.map(link => document.getElementById(link.hash.slice(1))).filter(Boolean);
  if (!sections.length) return;
  let active = null;
  const visible = new Set();
  const mark = id => {
    if (id === active) return;
    active = id;
    links.forEach(link => {
      if (link.hash === '#' + id) link.setAttribute('aria-current', 'location');
      else link.removeAttribute('aria-current');
    });
  };
  const initial = document.getElementById(location.hash.slice(1));
  mark(initial && sections.includes(initial) ? initial.id : sections[0].id);
  const observer = new IntersectionObserver(entries => {
    entries.forEach(entry => {
      if (entry.isIntersecting) visible.add(entry.target);
      else visible.delete(entry.target);
    });
    const candidates = sections.filter(section => visible.has(section));
    if (candidates.length) mark(candidates[0].id);
  }, {rootMargin: '-16% 0px -58% 0px', threshold: 0});
  sections.forEach(section => observer.observe(section));
  links.forEach(link => link.addEventListener('click', () => mark(link.hash.slice(1))));
})();