'use strict';
/* textbook-clip.js — floating «В мои материалы» button on textbook pages.
 * Injected by the server into /textbook/<slug>. Saves the currently open
 * paragraph as a link (/textbook/<slug>#sec-<id>) into the student's
 * personal materials. Reuses MaterialSave (material-save.js) + LS (api.js).
 * Hidden inside the classroom embed (iframe) to avoid clutter. */
(function () {
  if (window.parent !== window) return;            // skip in classroom embed
  if (!window.LS || !LS.getToken || !LS.getToken()) return; // only for logged-in users

  function chapterTitle() {
    return (document.title || 'Учебник').replace(/\s*[—|].*$/, '').replace(/\s*·\s*LearnSpace.*$/i, '').trim() || 'Учебник';
  }
  function sectionTitle() {
    const h = document.querySelector('.sec.active .sec-h');
    if (h && h.textContent.trim()) return h.textContent.trim();
    const n = document.querySelector('.psel-card.active .psel-name');
    if (n && n.textContent.trim()) return n.textContent.trim();
    return (document.title || 'Тема').split('·').pop().trim() || 'Тема';
  }
  function activeId() {
    const c = document.querySelector('.psel-card.active');
    return c && c.dataset ? c.dataset.id : null;
  }

  function save(btn) {
    if (!window.MaterialSave) { if (LS.toast) LS.toast('Модуль не загружен', 'error'); return; }
    const slug = location.pathname.replace(/^\/textbook\//, '').replace(/\/+$/, '');
    if (!slug) return;
    const id = activeId();
    const hash = id ? '#sec-' + id : (location.hash || '');
    MaterialSave.link({ title: sectionTitle(), url: '/textbook/' + slug + hash, sourceTitle: chapterTitle() }, btn);
  }

  function build() {
    if (document.getElementById('__ls_clip') || !document.body) return;
    const btn = document.createElement('button');
    btn.id = '__ls_clip';
    btn.type = 'button';
    btn.title = 'Сохранить эту тему в «Мои материалы»';
    btn.innerHTML = '<svg viewBox="0 0 24 24" width="15" height="15" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M19 21l-7-5-7 5V5a2 2 0 0 1 2-2h10a2 2 0 0 1 2 2z"/></svg><span>В мои материалы</span>';
    btn.style.cssText = 'position:fixed;right:18px;bottom:18px;z-index:9000;display:inline-flex;align-items:center;gap:7px;padding:10px 14px;border-radius:99px;border:none;background:#8b5cf6;color:#fff;font:600 13px/1 Inter,system-ui,sans-serif;cursor:pointer;box-shadow:0 6px 20px rgba(139,92,246,.4)';
    btn.addEventListener('click', function () { save(btn); });
    document.body.appendChild(btn);
  }

  if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', function () { setTimeout(build, 300); });
  else setTimeout(build, 300);
})();