// ── documenti.js — core namespace, refresh, pagination, settings ──
var _Doc = {};
_Doc.blocks      = [];
_Doc.PAGE_SIZE   = 10;
_Doc.currentPage = 1;
_Doc.autorefreshTimer = null;

_Doc.rebuildBlocks = function() {
  _Doc.blocks = Array.prototype.slice.call(document.querySelectorAll('.sess-block'));
};

_Doc.resetPage = function() { _Doc.currentPage = 1; };

_Doc.saveFilterState = function() {
  var tipo = {}, cartella = {};
  document.querySelectorAll('.tipo-chk').forEach(function(c){ tipo[c.value] = c.checked; });
  document.querySelectorAll('.cartella-chk').forEach(function(c){ cartella[c.value] = c.checked; });
  return { tipo: tipo, cartella: cartella };
};

_Doc.doRefresh = function() {
  var btn = document.getElementById('btn-refresh');
  if (btn) { btn.disabled = true; btn.textContent = '\u27F3 Aggiornamento\u2026'; }
  var state = _Doc.saveFilterState();
  fetch('/api/documenti')
    .then(function(r) { if (!r.ok) throw new Error('HTTP ' + r.status); return r.json(); })
    .then(function(data) {
      document.getElementById('doc-content').innerHTML = data.html;
      _Doc.rebuildBlocks();
      _Doc.buildDynamicFilters(state.tipo, state.cartella);
      _Doc.applyFilters();
      var tsEl = document.getElementById('doc-refresh-ts');
      if (tsEl) tsEl.textContent = data.ts;
    })
    .catch(function(err) { console.error('Refresh error:', err); })
    .finally(function() {
      if (btn) { btn.disabled = false; btn.textContent = '\u21BB Aggiorna dati'; }
    });
};

// ── Pagination ─────────────────────────────────────────────────────────────
// Pagination uses .pag-hidden class (not inline style) so export still works on all filtered data.

_Doc.applyPagination = function() {
  // Remove any previous pagination-hiding first
  _Doc.blocks.forEach(function(b) { b.classList.remove('pag-hidden'); });

  var visible = _Doc.blocks.filter(function(b) { return b.style.display !== 'none'; });
  var total   = Math.max(1, Math.ceil(visible.length / _Doc.PAGE_SIZE));
  var page    = _Doc.currentPage;
  if (page > total) page = _Doc.currentPage = total;
  if (page < 1)     page = _Doc.currentPage = 1;

  var countEl = document.getElementById('doc-visible-count');

  if (total <= 1) {
    var pag = document.getElementById('doc-pagination');
    if (pag) pag.innerHTML = '';
    if (countEl) countEl.textContent = visible.length + ' sessioni';
    return;
  }

  var start = (page - 1) * _Doc.PAGE_SIZE;
  visible.forEach(function(b, i) {
    b.classList.toggle('pag-hidden', i < start || i >= start + _Doc.PAGE_SIZE);
  });

  if (countEl) countEl.textContent = visible.length + ' sessioni \u2014 pag. ' + page + '/' + total;
  _Doc.renderPagination(page, total);
};

_Doc.renderPagination = function(page, total) {
  var pag = document.getElementById('doc-pagination');
  if (!pag) return;

  var lo = Math.max(1, page - 3);
  var hi = Math.min(total, lo + 6);
  lo = Math.max(1, hi - 6);

  var html = '<button class="doc-pag-btn" data-page="' + (page - 1) + '"' + (page === 1 ? ' disabled' : '') + '>&laquo;</button>';
  if (lo > 1) {
    html += '<button class="doc-pag-btn" data-page="1">1</button>';
    if (lo > 2) html += '<span class="doc-pag-ellipsis">&hellip;</span>';
  }
  for (var i = lo; i <= hi; i++) {
    html += '<button class="doc-pag-btn' + (i === page ? ' active' : '') + '" data-page="' + i + '">' + i + '</button>';
  }
  if (hi < total) {
    if (hi < total - 1) html += '<span class="doc-pag-ellipsis">&hellip;</span>';
    html += '<button class="doc-pag-btn" data-page="' + total + '">' + total + '</button>';
  }
  html += '<button class="doc-pag-btn" data-page="' + (page + 1) + '"' + (page === total ? ' disabled' : '') + '>&raquo;</button>';

  pag.innerHTML = html;
  pag.querySelectorAll('.doc-pag-btn:not([disabled])').forEach(function(btn) {
    btn.addEventListener('click', function() {
      _Doc.currentPage = parseInt(this.getAttribute('data-page'), 10);
      _Doc.applyPagination();
      document.getElementById('doc-content').scrollIntoView({ behavior: 'smooth', block: 'start' });
    });
  });
};

// ── Event listeners ────────────────────────────────────────────────────────
document.getElementById('btn-refresh').addEventListener('click', _Doc.doRefresh);

document.getElementById('btn-expand-all').addEventListener('click', function() {
  _Doc.blocks.forEach(function(b) {
    if (b.style.display !== 'none' && !b.classList.contains('pag-hidden')) b.open = true;
  });
});
document.getElementById('btn-collapse-all').addEventListener('click', function() {
  _Doc.blocks.forEach(function(b) {
    if (!b.classList.contains('pag-hidden')) b.open = false;
  });
});

// ── Settings modal ─────────────────────────────────────────────────────────
(function() {
  var wrenchDrop = document.querySelector('.wrench-drop');
  if (wrenchDrop) {
    var link = document.createElement('a');
    link.id = 'btn-page-settings';
    link.href = '#';
    link.innerHTML = '&#9881; Impostazioni&hellip;';
    wrenchDrop.appendChild(link);
  }

  var modal = document.createElement('div');
  modal.id = 'page-settings-modal';
  modal.className = 'page-settings-overlay';
  modal.innerHTML =
    '<div class="page-settings-dialog">' +
      '<div class="page-settings-hdr">' +
        '<span>Impostazioni pagina</span>' +
        '<button class="page-settings-close" id="btn-settings-close" title="Chiudi">&times;</button>' +
      '</div>' +
      '<div class="page-settings-body">' +
        '<div class="page-settings-row"><label><input type="checkbox" id="autorefresh-toggle"> Auto-aggiornamento</label></div>' +
        '<div class="page-settings-row"><span>Intervallo (sec)</span><input type="number" id="autorefresh-seconds" class="page-settings-input" value="60" min="5" max="3600"></div>' +
      '</div>' +
    '</div>';
  document.body.appendChild(modal);

  function openModal()  { modal.classList.add('open'); }
  function closeModal() { modal.classList.remove('open'); }

  var settingsBtn = document.getElementById('btn-page-settings');
  if (settingsBtn) {
    settingsBtn.addEventListener('click', function(e) {
      e.preventDefault(); e.stopPropagation();
      var drop = document.querySelector('.wrench-drop');
      if (drop) drop.classList.remove('open');
      openModal();
    });
  }
  document.getElementById('btn-settings-close').addEventListener('click', closeModal);
  modal.addEventListener('click', function(e) { if (e.target === modal) closeModal(); });
  document.addEventListener('keydown', function(e) { if (e.key === 'Escape') closeModal(); });

  document.getElementById('autorefresh-toggle').addEventListener('change', function() {
    if (this.checked) { startAutorefresh(); } else { stopAutorefresh(); }
  });
  document.getElementById('autorefresh-seconds').addEventListener('change', function() {
    if (document.getElementById('autorefresh-toggle').checked) { startAutorefresh(); }
  });
})();

function startAutorefresh() {
  stopAutorefresh();
  var secs = parseInt(document.getElementById('autorefresh-seconds').value, 10) || 60;
  if (secs < 5) secs = 5;
  _Doc.autorefreshTimer = setInterval(_Doc.doRefresh, secs * 1000);
}
function stopAutorefresh() {
  if (_Doc.autorefreshTimer) { clearInterval(_Doc.autorefreshTimer); _Doc.autorefreshTimer = null; }
}