(function() {
  const data = {
    linesLength: window.rehState ? (window.rehState.lines || []).length : 'no rehState',
    linesSample: window.rehState ? (window.rehState.lines || []).slice(0, 5) : [],
    a4Display: document.getElementById('reh-a4-page') ? document.getElementById('reh-a4-page').style.display : 'no a4',
    wrapChildrenCount: document.querySelector('.reh-page-wrap') ? document.querySelector('.reh-page-wrap').children.length : 'no wrap',
    paperHeights: Array.from(document.querySelectorAll('.reh-paper')).map(p => p.offsetHeight),
    paperChildrenCount: Array.from(document.querySelectorAll('.reh-paper')).map(p => p.children.length),
    scriptLinesChildrenCount: document.getElementById('reh-script-lines') ? document.getElementById('reh-script-lines').children.length : 'no script-lines',
    pageMode: window._pageMode || 'unknown',
    skipDesc: window.rehState ? window.rehState.skipDescriptions : 'unknown'
  };
  console.log(JSON.stringify(data, null, 2));
  alert(JSON.stringify(data, null, 2));
})();