(() => {
  function normalizeSearchText(value, options = {}) {
    const caseSensitive = Boolean(options.caseSensitive);
    const collapseWhitespace = Boolean(options.collapseWhitespace);
    let text = String(value ?? '');

    // Preserve the common German transliterations before Unicode accent
    // folding so searches treat umlauts and their ASCII spellings equally.
    text = text
      .replace(/Ä/g, 'Ae')
      .replace(/Ö/g, 'Oe')
      .replace(/Ü/g, 'Ue')
      .replace(/ä/g, 'ae')
      .replace(/ö/g, 'oe')
      .replace(/ü/g, 'ue')
      .replace(/ẞ/g, 'SS')
      .replace(/ß/g, 'ss')
      .normalize('NFKD')
      .replace(/[\u0300-\u036f]/g, '');

    if (collapseWhitespace) text = text.trim().replace(/\s+/g, ' ');
    if (!caseSensitive) text = text.toLocaleLowerCase();
    return text;
  }

  // Standalone filters and duplicate detection use the exact same comparison
  // rules as the generic table filters.
  window.AssetManagerNormalizeSearchText = normalizeSearchText;

  const collator = new Intl.Collator(document.documentElement.lang || 'de', {
    numeric: true,
    sensitivity: 'base'
  });

  function controlValue(control) {
    if (control.tagName === 'SELECT') {
      const selected = control.options?.[control.selectedIndex];
      return [
        control.value || '',
        selected?.textContent || ''
      ].join(' ');
    }

    if (control.type === 'checkbox' || control.type === 'radio') {
      return control.checked
        ? [
            control.value || '',
            control.getAttribute('aria-label') || '',
            control.closest('label')?.textContent || ''
          ].join(' ')
        : '';
    }

    return [
      control.value || '',
      control.getAttribute('placeholder') || '',
      control.getAttribute('aria-label') || ''
    ].join(' ');
  }

  function textOutsideControls(cell) {
    const clone = cell.cloneNode(true);
    clone.querySelectorAll('input, select, textarea, option').forEach(node => node.remove());
    return (clone.textContent || '').trim();
  }

  function textValue(cell) {
    if (!cell) return '';

    const explicitFilterValue = cell.dataset.filterValue || '';

    if (cell.dataset.sortValue !== undefined) {
      return `${cell.dataset.sortValue} ${explicitFilterValue}`.trim();
    }

    const controls = [...cell.querySelectorAll('input, select, textarea')];
    if (controls.length) {
      const controlText = controls.map(controlValue).join(' ').trim();
      const additionalText = textOutsideControls(cell);
      return `${explicitFilterValue} ${controlText} ${additionalText}`.trim();
    }

    return `${explicitFilterValue} ${cell.textContent || ''}`.trim();
  }

  function parsedValue(value) {
    const text = value.trim();
    if (!text) return { type: 'empty', value: '' };

    if (/^\d{4}-\d{2}-\d{2}(?:[ T].*)?$/.test(text)) {
      const timestamp = Date.parse(text.replace(' ', 'T'));
      if (!Number.isNaN(timestamp)) return { type: 'date', value: timestamp };
    }

    if (/^\d{1,2}\.\d{1,2}\.\d{4}$/.test(text)) {
      const [day, month, year] = text.split('.').map(Number);
      return { type: 'date', value: new Date(year, month - 1, day).getTime() };
    }

    if (/^(?:25[0-5]|2[0-4]\d|1?\d?\d)(?:\.(?:25[0-5]|2[0-4]\d|1?\d?\d)){3}$/.test(text)) {
      return { type: 'ipv4', value: text.split('.').map(Number) };
    }

    const numeric = text.replace(/\s/g, '').replace(',', '.');
    if (/^[-+]?\d+(?:\.\d+)?$/.test(numeric)) {
      return { type: 'number', value: Number(numeric) };
    }

    return { type: 'text', value: text };
  }

  function compareValues(a, b) {
    const left = parsedValue(a);
    const right = parsedValue(b);

    if (left.type === 'empty' && right.type !== 'empty') return 1;
    if (right.type === 'empty' && left.type !== 'empty') return -1;

    if (left.type === right.type && (left.type === 'number' || left.type === 'date')) {
      return left.value - right.value;
    }

    if (left.type === 'ipv4' && right.type === 'ipv4') {
      for (let index = 0; index < 4; index += 1) {
        const difference = left.value[index] - right.value[index];
        if (difference) return difference;
      }
      return 0;
    }

    return collator.compare(String(left.value), String(right.value));
  }

  function initTable(table) {
    const thead = table.tHead;
    const tbody = table.tBodies[0];
    if (!thead || !tbody || !thead.rows.length) return;
    if (table.dataset.tableToolsReady === '1') return;

    const headerRow = thead.rows[0];

    const isAssetTable = table.id === 'asset-table';
    const usesServerFilters = table.dataset.serverFilters === '1';
    let serverFilterTimer = null;

    // Normal tables get stable synthetic keys. The asset table already has
    // real data-field keys on its movable columns; selection and action
    // columns must remain without a field key.
    if (!isAssetTable) {
      [...headerRow.cells].forEach((header, index) => {
        if (!header.dataset.field) {
          header.dataset.field = `__col_${index}`;
          header.dataset.syntheticField = '1';
        }
      });

      [...tbody.rows].forEach(row => {
        [...row.cells].forEach((cell, index) => {
          const header = headerRow.cells[index];
          if (header && !cell.dataset.field) {
            cell.dataset.field = header.dataset.field;
            cell.dataset.syntheticField = '1';
          }
        });
      });
    }

    const filterRow = document.createElement('tr');
    filterRow.className = 'column-filter-row';
    filterRow.dataset.tableFilterRow = '1';

    const filterDefinitions = [];

    function filterStatusTarget() {
      const wrapper = table.closest(
        '#asset-table-scroll, .management-table-scroll, .table-scroll, .table-wrap, .sticky-table'
      );
      return wrapper || table;
    }

    function ensureFilterStatus() {
      let status = table._filterStatusElement;
      if (status?.isConnected) return status;

      status = document.createElement('div');
      status.className = 'table-filter-status';
      status.hidden = true;
      status.setAttribute('role', 'status');
      status.setAttribute('aria-live', 'polite');

      const icon = document.createElement('span');
      icon.className = 'table-filter-status-icon';
      icon.textContent = '⌕';
      icon.setAttribute('aria-hidden', 'true');

      const label = document.createElement('strong');
      label.className = 'table-filter-status-label';

      const details = document.createElement('span');
      details.className = 'table-filter-status-details';

      const clearButton = document.createElement('button');
      clearButton.type = 'button';
      clearButton.className = 'button button-secondary table-filter-clear';
      clearButton.textContent =
        document.body.dataset.clearFiltersLabel || 'Filter zurücksetzen';
      clearButton.addEventListener('click', () => {
        filterDefinitions.forEach(definition => {
          definition.input.value = '';
        });
        applyFilters();
        if (usesServerFilters) submitServerFilters(true);

        // Keep the persisted browser state in sync with the visible table.
        // Programmatic value changes do not trigger input/change automatically.
        window.dispatchEvent(new CustomEvent('asset-table-filters-cleared', {
          detail: { table }
        }));

        filterDefinitions[0]?.input?.focus();
      });

      status.append(icon, label, details, clearButton);

      const target = filterStatusTarget();
      target.parentNode?.insertBefore(status, target);
      table._filterStatusElement = status;
      return status;
    }

    function updateFilterPresentation(active, visibleRows, totalRows) {
      filterDefinitions.forEach(definition => {
        const hasValue = Boolean(definition.input.value.trim());
        definition.input.classList.toggle('filter-input-active', hasValue);
        definition.input.closest('th')?.classList.toggle('filter-cell-active', hasValue);
      });

      const status = ensureFilterStatus();
      const label = status.querySelector('.table-filter-status-label');
      const details = status.querySelector('.table-filter-status-details');
      const activeCount = active.length;

      status.hidden = activeCount === 0;
      status.classList.toggle('is-active', activeCount > 0);

      if (activeCount > 0) {
        const activeTemplate =
          document.body.dataset.filtersActiveTemplate || '{count} Filter aktiv';
        const statusTemplate =
          document.body.dataset.filterStatusTemplate ||
          'Gefiltert: {visible} von {total} Datensätzen';

        label.textContent = activeTemplate.replace('{count}', String(activeCount));
        details.textContent = statusTemplate
          .replace('{visible}', String(visibleRows))
          .replace('{total}', String(totalRows));
      }
    }

    function cellForDefinition(row, definition) {
      if (definition.field) {
        return row.querySelector(`td[data-field="${CSS.escape(definition.field)}"]`);
      }
      return row.cells[definition.columnIndex] || null;
    }

    function rebuildMissingCellKeys() {
      if (isAssetTable) return;

      [...tbody.rows].forEach(row => {
        [...row.cells].forEach((cell, index) => {
          const header = headerRow.cells[index];
          if (header && !cell.dataset.field) {
            cell.dataset.field = header.dataset.field;
          }
        });
      });
    }

    function numericFilterMatches(rawValue, rawTerm) {
      const value = Number(String(rawValue).trim().replace(',', '.'));
      if (!Number.isFinite(value)) return false;

      const term = String(rawTerm || '').trim().toLocaleLowerCase();
      if (!term) return true;

      const normalize = input => input.replace(',', '.').trim();
      let match = term.match(/^(<=|>=|<|>|=)\s*(-?\d+(?:[.,]\d+)?)$/);
      if (match) {
        const expected = Number(normalize(match[2]));
        if (match[1] === '<') return value < expected;
        if (match[1] === '<=') return value <= expected;
        if (match[1] === '>') return value > expected;
        if (match[1] === '>=') return value >= expected;
        return value === expected;
      }

      match = term.match(/^(-?\d+(?:[.,]\d+)?)\s*(?:\.\.|-)\s*(-?\d+(?:[.,]\d+)?)$/);
      if (!match) {
        match = term.match(/^(?:zwischen|between)\s+(-?\d+(?:[.,]\d+)?)\s+(?:und|and)\s+(-?\d+(?:[.,]\d+)?)$/);
      }
      if (match) {
        const first = Number(normalize(match[1]));
        const second = Number(normalize(match[2]));
        const minimum = Math.min(first, second);
        const maximum = Math.max(first, second);
        return value >= minimum && value <= maximum;
      }

      const exact = Number(normalize(term));
      return Number.isFinite(exact) ? value === exact : false;
    }


    function submitServerFilters(immediate = false) {
      if (!usesServerFilters) return;
      if (serverFilterTimer) window.clearTimeout(serverFilterTimer);

      const navigate = () => {
        const target = new URL(
          table.dataset.serverFilterUrl || window.location.pathname,
          window.location.origin
        );
        const current = new URL(window.location.href);
        const limit = current.searchParams.get('job_limit');
        if (limit) target.searchParams.set('job_limit', limit);

        filterDefinitions.forEach(definition => {
          if (!definition.serverName) return;
          const value = definition.input.value.trim();
          if (value) target.searchParams.set(`job_filter_${definition.serverName}`, value);
        });

        try {
          window.sessionStorage.setItem(
            'assetmanager:software-jobs:last-server-filter',
            document.activeElement?.name || ''
          );
        } catch (_) {}
        window.location.assign(target.toString());
      };

      if (immediate) navigate();
      else serverFilterTimer = window.setTimeout(navigate, 700);
    }

    function applyFilters() {
      rebuildMissingCellKeys();

      const active = filterDefinitions
        .map(definition => ({
          definition,
          term: normalizeSearchText(definition.input?.value.trim() || '')
        }))
        .filter(item => item.term);

      if (usesServerFilters) {
        const serverTotal = Number.parseInt(table.dataset.serverFilterTotal || '', 10);
        const total = Number.isFinite(serverTotal) ? serverTotal : tbody.rows.length;
        updateFilterPresentation(active, tbody.rows.length, total);
        window.dispatchEvent(new CustomEvent('asset-table-filter-changed', {
          detail: {
            table,
            visible: tbody.rows.length,
            total,
            activeFilters: active.length
          }
        }));
        return;
      }

      let visibleRows = 0;

      [...tbody.rows].forEach(row => {
        const hidden = active.some(({ definition, term }) => {
          const cell = cellForDefinition(row, definition);
          const value = textValue(cell);
          if (definition.numericFilter) {
            return !numericFilterMatches(value, term);
          }
          return !normalizeSearchText(value).includes(term);
        });

        row.hidden = hidden;
        if (!hidden) visibleRows += 1;
      });

      updateFilterPresentation(active, visibleRows, tbody.rows.length);

      window.dispatchEvent(new CustomEvent('asset-table-filter-changed', {
        detail: {
          table,
          visible: visibleRows,
          total: tbody.rows.length,
          activeFilters: active.length
        }
      }));
    }

    [...headerRow.cells].forEach((header, columnIndex) => {
      const field = header.dataset.field || '';
      const serverName = header.dataset.serverFilterName || '';

      if (!header.dataset.noSort) {
        header.classList.add('sortable-column');
        header.title = header.dataset.sortTitle || 'Zum Sortieren anklicken';

        header.addEventListener('click', event => {
          if (event.target.closest('input,button,a,select,textarea,label')) return;

          const direction = header.dataset.sortDirection === 'asc' ? 'desc' : 'asc';

          [...headerRow.cells].forEach(item => {
            delete item.dataset.sortDirection;
            item.classList.remove('sort-asc', 'sort-desc');
          });

          header.dataset.sortDirection = direction;
          header.classList.add(direction === 'asc' ? 'sort-asc' : 'sort-desc');

          const rows = [...tbody.rows];
          rows.sort((left, right) => {
            const definition = { field, columnIndex };
            const result = compareValues(
              textValue(cellForDefinition(left, definition)),
              textValue(cellForDefinition(right, definition))
            );
            return direction === 'asc' ? result : -result;
          });

          const fragment = document.createDocumentFragment();
          rows.forEach(row => fragment.appendChild(row));
          tbody.appendChild(fragment);
          applyFilters();
        });
      }

      const filterCell = document.createElement('th');
      if (field) filterCell.dataset.field = field;
      filterCell.dataset.columnIndex = String(columnIndex);

      if (!header.dataset.noFilter && (!usesServerFilters || serverName)) {
        const input = document.createElement('input');
        input.type = 'search';
        input.placeholder = header.dataset.filterPlaceholder || 'Filtern …';
        input.setAttribute('aria-label', `Filter ${textValue(header)}`);
        input.autocomplete = 'off';
        if (usesServerFilters) {
          input.name = `job_filter_${serverName}`;
          input.value = header.dataset.serverFilterValue || '';
          input.addEventListener('input', () => {
            applyFilters();
            submitServerFilters(false);
          });
          input.addEventListener('search', () => {
            applyFilters();
            submitServerFilters(false);
          });
          input.addEventListener('keydown', event => {
            if (event.key !== 'Enter') return;
            event.preventDefault();
            submitServerFilters(true);
          });
        } else {
          input.addEventListener('input', applyFilters);
          input.addEventListener('search', applyFilters);
        }

        filterCell.appendChild(input);
        filterDefinitions.push({
          field,
          columnIndex,
          input,
          serverName,
          numericFilter: header.dataset.numericFilter === '1'
        });
      }

      filterRow.appendChild(filterCell);
    });

    thead.appendChild(filterRow);

    // Editable cells are always read live, so changed values immediately
    // participate in filtering without a stale cache.
    tbody.addEventListener('input', event => {
      if (event.target.matches('input,select,textarea')) applyFilters();
    });

    tbody.addEventListener('change', event => {
      if (event.target.matches('input,select,textarea')) applyFilters();
    });

    table.assetApplyFilters = applyFilters;
    table.assetRebuildFilterCache = rebuildMissingCellKeys;
    table.dataset.tableToolsReady = '1';
    ensureFilterStatus();

    // Covers browser-restored values after reload/back navigation.
    requestAnimationFrame(() => {
      applyFilters();
      if (usesServerFilters) {
        try {
          const lastName = window.sessionStorage.getItem('assetmanager:software-jobs:last-server-filter');
          const lastInput = lastName
            ? filterDefinitions.find(definition => definition.input.name === lastName)?.input
            : null;
          if (lastInput) {
            lastInput.focus();
            lastInput.setSelectionRange(lastInput.value.length, lastInput.value.length);
          }
          window.sessionStorage.removeItem('assetmanager:software-jobs:last-server-filter');
        } catch (_) {}
      }
    });

    window.dispatchEvent(new CustomEvent('asset-table-structure-ready', {
      detail: { table }
    }));
  }

  document.querySelectorAll('table.data-table').forEach(initTable);

  window.addEventListener('asset-table-content-reloaded', event => {
    const table = event.detail?.table;
    if (table?.assetRebuildFilterCache) {
      table.assetRebuildFilterCache();
      table.assetApplyFilters?.();
    }
  });
})();