/**
 * ZDDC — shared selectable + autofilter table (used by the classifier worklist +
 * By-tracking grid, and the tables tool's "Add from archive").
 *
 * A flat table with PER-COLUMN autofilters (one input per column, AND-combined),
 * MULTI-COLUMN SORT (click a header to sort; shift/ctrl-click adds a secondary
 * key), RESIZABLE columns (drag the header edge), an optional programmatic global
 * filter, and powerful selection:
 *   click             replace selection + set anchor
 *   ctrl/cmd-click    toggle one row
 *   shift-click       range from the anchor (replaces the selection)
 *   ctrl-shift-click  ADD the anchor→row range to the existing selection
 *   ctrl/cmd-Enter    fire onActivate(selectedIds) — a bulk action
 *   Esc               clear
 * Ranges run over the CURRENTLY FILTERED + SORTED order. Selection is keyed by a
 * stable rowId so it survives filtering, sorting, and re-render. Pass
 * opts.persistKey to remember column widths + sort across reloads (localStorage).
 *
 * Column config: { key, title, cls?, get?(row), render?(row, td), filterable?,
 *   sortable?, sortValue?(row) }. sortable/filterable default true; set false for
 *   render-only columns (a remove button, a derived badge).
 */
(function () {
    'use strict';
    if (!window.app) window.app = {};
    if (!window.app.modules) window.app.modules = {};

    function terms(q) { return String(q == null ? '' : q).trim().toLowerCase().split(/\s+/).filter(Boolean); }
    function hit(text, ts) {
        var t = String(text == null ? '' : text).toLowerCase();
        for (var i = 0; i < ts.length; i++) { if (t.indexOf(ts[i]) === -1) return false; }
        return true;
    }
    function elt(tag, cls, text) {
        var e = document.createElement(tag);
        if (cls) e.className = cls;
        if (text != null) e.textContent = text;
        return e;
    }
    function loadPersist(key) { try { return JSON.parse(localStorage.getItem(key)) || {}; } catch (_) { return {}; } }
    function savePersist(key, patch) {
        var cur = loadPersist(key);
        for (var k in patch) cur[k] = patch[k];
        try { localStorage.setItem(key, JSON.stringify(cur)); } catch (_) { /* private mode */ }
    }

    function create(opts) {
        var container = opts.container;
        var columns = opts.columns || [];
        var rowId = opts.rowId || function (r) { return r.id; };
        var getRows = (typeof opts.rows === 'function') ? opts.rows : function () { return opts.rows || []; };
        var selected = Object.create(null);   // id -> true
        var anchorId = null;
        var globalTerms = [];                  // programmatic global filter (tests/reveal)
        var colFilters = Object.create(null);  // colKey -> terms[]  (the per-column autofilters)

        var persistKey = opts.persistKey || null;
        var saved = persistKey ? loadPersist(persistKey) : {};
        var sortState = Array.isArray(saved.sort) ? saved.sort.slice() : [];   // [{ key, dir }]
        var colWidths = saved.widths || {};                                    // colKey -> px
        var headEls = Object.create(null);     // colKey -> { th, ind }

        function rows() { return getRows() || []; }
        function colByKey(k) { for (var i = 0; i < columns.length; i++) { if (columns[i].key === k) return columns[i]; } return null; }
        function colVal(col, row) { return col.get ? col.get(row) : (row[col.key] == null ? '' : row[col.key]); }
        function rowBlob(row) { var s = ''; for (var i = 0; i < columns.length; i++) { s += colVal(columns[i], row) + ' '; } return s; }
        function rowMatches(row) {
            if (globalTerms.length && !hit(rowBlob(row), globalTerms)) return false;
            for (var k in colFilters) {
                var col = colByKey(k);
                if (col && !hit(colVal(col, row), colFilters[k])) return false;
            }
            return true;
        }
        function filtered() { return rows().filter(rowMatches); }

        // ── multi-column sort ──────────────────────────────────────────────
        function sortVal(col, row) { return col.sortValue ? col.sortValue(row) : colVal(col, row); }
        function sorted(list) {
            if (!sortState.length) return list;
            var arr = list.slice();
            arr.sort(function (a, b) {
                for (var i = 0; i < sortState.length; i++) {
                    var s = sortState[i], col = colByKey(s.key); if (!col) continue;
                    var cmp = String(sortVal(col, a)).localeCompare(String(sortVal(col, b)), undefined, { numeric: true, sensitivity: 'base' });
                    if (cmp) return s.dir === 'desc' ? -cmp : cmp;
                }
                return 0;
            });
            return arr;
        }
        function visibleRows() { return sorted(filtered()); }
        function sortIdx(key) { for (var i = 0; i < sortState.length; i++) { if (sortState[i].key === key) return i; } return -1; }
        function toggleSort(key, add) {
            var i = sortIdx(key);
            if (add) {
                if (i >= 0) { if (sortState[i].dir === 'asc') sortState[i].dir = 'desc'; else sortState.splice(i, 1); }
                else sortState.push({ key: key, dir: 'asc' });
            } else {
                if (i === 0 && sortState.length === 1) sortState = sortState[0].dir === 'asc' ? [{ key: key, dir: 'desc' }] : [];
                else sortState = [{ key: key, dir: 'asc' }];
            }
            if (persistKey) savePersist(persistKey, { sort: sortState });
            updateSortIndicators(); renderBody();
        }
        function updateSortIndicators() {
            columns.forEach(function (c) {
                var h = headEls[c.key]; if (!h) return;
                var i = sortIdx(c.key);
                h.ind.textContent = i >= 0 ? ((sortState[i].dir === 'asc' ? ' ▲' : ' ▼') + (sortState.length > 1 ? (i + 1) : '')) : '';
            });
        }
        // ── resizable columns ──────────────────────────────────────────────
        function addResizer(th, key) {
            var rz = elt('div', 'seltable__resizer');
            rz.addEventListener('mousedown', function (e) {
                e.preventDefault(); e.stopPropagation();
                var startX = e.clientX, startW = th.offsetWidth;
                function mm(ev) { var w = Math.max(40, startW + (ev.clientX - startX)); th.style.width = th.style.minWidth = th.style.maxWidth = w + 'px'; }
                function mu() {
                    document.removeEventListener('mousemove', mm); document.removeEventListener('mouseup', mu);
                    colWidths[key] = Math.round(th.offsetWidth);
                    if (persistKey) savePersist(persistKey, { widths: colWidths });
                }
                document.addEventListener('mousemove', mm); document.addEventListener('mouseup', mu);
            });
            th.appendChild(rz);
        }

        function getSelection() { return Object.keys(selected); }
        function getFilteredRows() { return filtered(); }
        function fireSel() { if (opts.onSelectionChange) opts.onSelectionChange(getSelection()); }
        function setFilter(q) { globalTerms = terms(q); renderBody(); }
        function setColFilter(colKey, q) { var t = terms(q); if (t.length) colFilters[colKey] = t; else delete colFilters[colKey]; renderBody(); }
        function selectAllFiltered() { filtered().forEach(function (r) { selected[rowId(r)] = true; }); anchorId = null; renderBody(); fireSel(); }
        function clearSel() { selected = Object.create(null); anchorId = null; renderBody(); fireSel(); }

        function onRowClick(e, row, fr) {
            var ids = fr.map(rowId), id = rowId(row), idx = ids.indexOf(id), aIdx;
            if (e.shiftKey && anchorId != null && (aIdx = ids.indexOf(anchorId)) >= 0) {
                if (!(e.ctrlKey || e.metaKey)) selected = Object.create(null);   // shift replaces; ctrl-shift adds
                var lo = Math.min(aIdx, idx), hi = Math.max(aIdx, idx);
                for (var i = lo; i <= hi; i++) selected[ids[i]] = true;
            } else if (e.ctrlKey || e.metaKey) {
                if (selected[id]) delete selected[id]; else selected[id] = true;
                anchorId = id;
            } else {
                selected = Object.create(null); selected[id] = true; anchorId = id;
            }
            renderBody(); fireSel();
        }

        var bodyEl = null, countEl = null;
        function render() {
            container.textContent = '';
            container.classList.add('seltable');
            var bar = elt('div', 'seltable__bar');
            var allBtn = elt('button', 'btn btn-sm btn-secondary', 'Select filtered');
            allBtn.addEventListener('click', selectAllFiltered);
            var clrBtn = elt('button', 'btn btn-sm btn-secondary', 'Clear');
            clrBtn.addEventListener('click', clearSel);
            countEl = elt('span', 'seltable__count');
            bar.appendChild(allBtn); bar.appendChild(clrBtn); bar.appendChild(countEl);
            container.appendChild(bar);

            var scroll = elt('div', 'seltable__scroll');
            var table = elt('table', 'seltable__table');
            var thead = elt('thead'), htr = elt('tr');
            headEls = Object.create(null);
            columns.forEach(function (c) {
                var th = elt('th', c.cls || null);
                th.appendChild(document.createTextNode(c.title || c.key));
                var ind = elt('span', 'seltable__sortind'); th.appendChild(ind);
                headEls[c.key] = { th: th, ind: ind };
                if (colWidths[c.key]) { th.style.width = th.style.minWidth = th.style.maxWidth = colWidths[c.key] + 'px'; }
                if (c.sortable !== false) {
                    th.classList.add('seltable__th--sortable');
                    th.addEventListener('click', function (e) {
                        if (e.target.classList.contains('seltable__resizer')) return;
                        toggleSort(c.key, e.shiftKey || e.ctrlKey || e.metaKey);
                    });
                }
                addResizer(th, c.key);
                htr.appendChild(th);
            });
            if (opts.rowExtra) htr.appendChild(elt('th', 'seltable__extrah', opts.extraTitle || ''));
            thead.appendChild(htr);
            // Per-column autofilter row.
            var ftr = elt('tr', 'seltable__filters');
            columns.forEach(function (c) {
                var th = elt('th');
                if (c.filterable !== false) {
                    var inp = elt('input', 'seltable__colfilter'); inp.type = 'search'; inp.placeholder = 'filter…'; inp.spellcheck = false;
                    inp.setAttribute('data-no-select', '');
                    if (colFilters[c.key]) inp.value = colFilters[c.key].join(' ');
                    inp.addEventListener('input', function () { setColFilter(c.key, this.value); });
                    th.appendChild(inp);
                }
                ftr.appendChild(th);
            });
            if (opts.rowExtra) ftr.appendChild(elt('th'));
            thead.appendChild(ftr);
            table.appendChild(thead);
            bodyEl = elt('tbody'); table.appendChild(bodyEl);
            scroll.appendChild(table); container.appendChild(scroll);

            container.tabIndex = 0;
            container.addEventListener('keydown', function (e) {
                if ((e.ctrlKey || e.metaKey) && e.key === 'Enter') { e.preventDefault(); if (opts.onActivate) opts.onActivate(getSelection()); }
                else if (e.key === 'Escape') { clearSel(); }
            });
            updateSortIndicators();
            renderBody();
        }
        function renderBody() {
            if (!bodyEl) return;
            var fr = visibleRows();
            bodyEl.textContent = '';
            fr.forEach(function (row) {
                var id = rowId(row);
                var tr = elt('tr', 'seltable__row' + (selected[id] ? ' is-selected' : ''));
                tr.dataset.id = id;
                tr.addEventListener('click', function (e) {
                    if (e.target.closest('input,button,select,a,[data-no-select]')) return;
                    onRowClick(e, row, fr);
                });
                if (opts.onRowDrop) {
                    tr.addEventListener('dragover', function (e) {
                        if (window.app.modules.dnd && window.app.modules.dnd.active()) { e.preventDefault(); e.dataTransfer.dropEffect = 'copy'; tr.classList.add('drop-hover'); }
                    });
                    tr.addEventListener('dragleave', function () { tr.classList.remove('drop-hover'); });
                    tr.addEventListener('drop', function (e) {
                        tr.classList.remove('drop-hover');
                        e.preventDefault();
                        var keys = window.app.modules.dnd ? window.app.modules.dnd.getDrag() : [];
                        if (window.app.modules.dnd) window.app.modules.dnd.clearDrag();
                        if (keys.length) opts.onRowDrop(id, keys);
                    });
                }
                columns.forEach(function (c) {
                    var td = elt('td', c.cls || null);
                    if (c.render) c.render(row, td); else td.textContent = colVal(c, row);
                    tr.appendChild(td);
                });
                if (opts.rowExtra) { var ex = elt('td', 'seltable__extra'); opts.rowExtra(row, ex); tr.appendChild(ex); }
                bodyEl.appendChild(tr);
            });
            if (countEl) {
                var nSel = getSelection().length;
                countEl.textContent = fr.length + ' shown' + (nSel ? ' · ' + nSel + ' selected' : '');
            }
        }

        return {
            render: render, renderBody: renderBody,
            getSelection: getSelection, getFilteredRows: getFilteredRows,
            setFilter: setFilter, setColFilter: setColFilter, selectAllFiltered: selectAllFiltered, clear: clearSel,
            sortBy: toggleSort, getSortState: function () { return sortState.slice(); },
            clickRow: function (id, mods) {
                var fr = visibleRows();
                var row = fr.filter(function (r) { return String(rowId(r)) === String(id); })[0];
                if (row) onRowClick(Object.assign({ shiftKey: false, ctrlKey: false, metaKey: false }, mods || {}), row, fr);
            },
        };
    }

    window.app.modules.seltable = { create: create };
})();