'use strict';

// ---------------------------------------------------------------------------
// Sidebar
// ---------------------------------------------------------------------------

function openSidebar(title, htmlContent) {
  $('sidebar-title').textContent = title;
  $('sidebar-body').innerHTML = sanitizeSidebarHtml(htmlContent);
  $('sidebar-overlay').style.display = '';
  $('sidebar').classList.add('open');
}

function closeSidebar() {
  $('sidebar').classList.remove('open');
  $('sidebar-overlay').style.display = 'none';
}

document.addEventListener('keydown', e => {
  const overlay = $('reader-overlay');
  const readerOpen = overlay && overlay.style.display !== 'none';

  if (e.key === 'Escape') {
    if (readerOpen) {
      closeReader();
    } else {
      closeSidebar();
    }
  }

  if (readerOpen) {
    if ((e.ctrlKey && e.key === 'f') || e.key === 'F3') {
      e.preventDefault();
      toggleReaderSearch();
    }
    if (readerSearchOpen) {
      if (e.key === 'ArrowDown') { e.preventDefault(); readerSearchNext(); }
      if (e.key === 'ArrowUp')   { e.preventDefault(); readerSearchPrev(); }
    }
    // PDF page by page: arrows, Space, PageUp/PageDown turn (scrolling has its own keys below).
    if (readerSettings.pdfPaginated && currentPdfDoc && !readerSearchOpen
        && !/^(INPUT|TEXTAREA|SELECT)$/.test((document.activeElement && document.activeElement.tagName) || '')) {
      const turn = {ArrowRight: 1, ArrowDown: 1, PageDown: 1, ' ': e.shiftKey ? -1 : 1,
                    ArrowLeft: -1, ArrowUp: -1, PageUp: -1}[e.key];
      if (turn) { e.preventDefault(); pdfGoToPage(pdfCurrentPage + turn); return; }
    }

    // Vim-style scroll — ignore when typing in an input
    const tag = document.activeElement?.tagName;
    if (tag !== 'INPUT' && tag !== 'TEXTAREA') {
      const contentEl = $('reader-content');
      if (contentEl) {
        const large = Math.round(contentEl.clientHeight * 0.85);
        const continuousKeys = {'j': 1, 'k': -1};
        if (continuousKeys[e.key] !== undefined && !e.repeat) {
          e.preventDefault();
          _readerScrollDir = continuousKeys[e.key];
          if (!_readerScrollInterval) {
            _readerScrollLastTs = performance.now();
            _readerScrollInterval = setInterval(_readerScrollTick, READER_SCROLL_TICK_MS);
          }
        }
        if (e.key === 'd') { e.preventDefault(); contentEl.scrollBy({top:  large / 2, behavior: 'smooth'}); }
        if (e.key === 'u') { e.preventDefault(); contentEl.scrollBy({top: -large / 2, behavior: 'smooth'}); }
        if (e.key === 'f') { e.preventDefault(); contentEl.scrollBy({top:  large, behavior: 'smooth'}); }
        if (e.key === 'b') { e.preventDefault(); contentEl.scrollBy({top: -large, behavior: 'smooth'}); }
        if (e.key === 'g') { e.preventDefault(); contentEl.scrollTop = 0; }
        if (e.key === 'G') { e.preventDefault(); contentEl.scrollTop = contentEl.scrollHeight; }
        if (currentPdfDoc && !readerSettings.pdfPaginated) {
          if (e.key === 'n') { e.preventDefault(); pdfGoToPage(pdfCurrentPage + 1); }
          if (e.key === 'p') { e.preventDefault(); pdfGoToPage(pdfCurrentPage - 1); }
        }
      }
    }
  }
});

document.addEventListener('keyup', e => {
  if (e.key === 'j' || e.key === 'k') {
    clearInterval(_readerScrollInterval);
    _readerScrollInterval = null;
    _readerScrollDir = 0;
  }
});

function sanitizeSidebarHtml(html) {
  if (!html) return '<p class="muted">Keine Shownotes vorhanden.</p>';
  const div = document.createElement('div');
  div.innerHTML = html;
  div.querySelectorAll('script, iframe, object, embed, style').forEach(el => el.remove());
  div.querySelectorAll('*').forEach(el => {
    Array.from(el.attributes).forEach(attr => {
      if (attr.name.startsWith('on')) el.removeAttribute(attr.name);
    });
    if (el.tagName === 'A') {
      el.setAttribute('target', '_blank');
      el.setAttribute('rel', 'noopener noreferrer');
    }
  });
  return div.innerHTML;
}