minigdb 0.1.0

An embedded property-graph database in Rust with a GQL query language, RocksDB-backed ACID storage, graph algorithms, and Python bindings
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131

<!DOCTYPE html>
<html lang="en"><head>
<meta charset="utf-8"><title>minigdb</title>
<link rel="icon" type="image/webp" href="/assets/minigdb_logo.webp">
<script src="https://cdn.jsdelivr.net/npm/cytoscape@3.29.2/dist/cytoscape.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/dagre@0.8.5/dist/dagre.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/cytoscape-dagre@2.5.0/cytoscape-dagre.js"></script>
<script src="https://cdn.jsdelivr.net/npm/cytoscape-fcose@2.2.0/cytoscape-fcose.js"></script>
<style>
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:system-ui,-apple-system,'Segoe UI',sans-serif;background:#0d1117;color:#c9d1d9;height:100vh;display:flex;flex-direction:column;overflow:hidden}
/* header */
#hdr{background:#161b22;padding:7px 14px;display:flex;align-items:center;gap:8px;border-bottom:1px solid #30363d;flex-shrink:0}
#hdr h1{color:#58a6ff;font-size:1em;letter-spacing:1px;white-space:nowrap}
#status{color:#8b949e;font-size:11px;margin-left:auto;white-space:nowrap}
/* controls */
select,input{background:#21262d;color:#c9d1d9;border:1px solid #30363d;padding:3px 7px;border-radius:4px;font-family:inherit;font-size:12px}
button{background:#21262d;color:#c9d1d9;border:1px solid #30363d;padding:3px 10px;cursor:pointer;border-radius:4px;font-size:12px;white-space:nowrap}
button:hover{background:#58a6ff;color:#0d1117;border-color:#58a6ff}
button.active{background:#1f6feb;border-color:#388bfd;color:#fff}
button.danger:hover{background:#f85149;border-color:#f85149}
/* transaction buttons */
button.txn-begin{border-color:#3fb950;color:#3fb950}
button.txn-begin:hover{background:#3fb950;color:#0d1117}
button.txn-commit{background:#0d2010;border-color:#3fb950;color:#3fb950}
button.txn-commit:hover{background:#3fb950;color:#0d1117}
button.txn-rollback{background:#200d0d;border-color:#f85149;color:#f85149}
button.txn-rollback:hover{background:#f85149;color:#0d1117}
/* main split */
#main{display:flex;flex:1;overflow:hidden}
#left{width:44%;display:flex;flex-direction:column;min-width:220px;max-width:78%}
/* drag handle */
#drag-handle{width:5px;background:#30363d;cursor:col-resize;flex-shrink:0;transition:background .15s;z-index:10}
#drag-handle:hover,#drag-handle.dragging{background:#58a6ff}
/* editor */
#editor-wrap{padding:8px;border-bottom:1px solid #30363d;position:relative}
#gql{width:100%;height:108px;background:#0d1117;color:#79c0ff;border:1px solid #30363d;padding:8px;font-family:'Courier New',monospace;font-size:13px;resize:none;border-radius:4px;line-height:1.4}
#gql:focus{outline:none;border-color:#58a6ff}
#hist-nav{position:absolute;bottom:12px;right:12px;font-size:10px;color:#484f58;pointer-events:none}
#btns{display:flex;gap:6px;padding:6px 8px;align-items:center;flex-shrink:0;border-bottom:1px solid #21262d;flex-wrap:wrap}
/* transaction bar */
#txnbar{display:flex;gap:6px;padding:4px 8px;align-items:center;flex-shrink:0;border-bottom:1px solid #30363d}
#txn-status{font-size:11px;color:#484f58;margin-right:auto}
#txn-status.active{color:#3fb950}
#results{flex:1;overflow:auto}
/* table */
table{border-collapse:collapse;width:100%;font-size:12px}
th{background:#161b22;color:#58a6ff;padding:5px 10px;text-align:left;position:sticky;top:0;border-bottom:1px solid #30363d;font-weight:normal;cursor:pointer;user-select:none;white-space:nowrap}
th:hover{color:#79c0ff}
th .sa{color:#484f58;margin-left:3px;font-size:10px}
th.sort-asc .sa::after{content:'↑';color:#58a6ff}
th.sort-desc .sa::after{content:'↓';color:#58a6ff}
th:not(.sort-asc):not(.sort-desc) .sa::after{content:'⇅'}
td{padding:4px 10px;border-bottom:1px solid #21262d;white-space:nowrap;max-width:220px;overflow:hidden;text-overflow:ellipsis}
tr:hover td{background:#161b22}
.null{color:#484f58;font-style:italic}
.err{color:#f85149;padding:8px 10px;font-size:12px}
.info{color:#8b949e;padding:8px 10px;font-size:12px}
.id-link{color:#58a6ff;text-decoration:underline;cursor:pointer;font-size:11px}
.id-link:hover{color:#79c0ff}
/* right / graph */
#right{flex:1;display:flex;flex-direction:column;overflow:hidden}
#gtbar{background:#161b22;border-bottom:1px solid #30363d;padding:5px 8px;display:grid;grid-template-columns:auto auto auto auto;gap:4px 10px;align-items:center;flex-shrink:0}
#gtbar label{color:#8b949e;font-size:11px;white-space:nowrap}
.gtcol{display:flex;align-items:center;gap:4px}
#filter-input{width:110px;font-size:11px;padding:2px 6px}
#graph-wrap{flex:1;position:relative;overflow:hidden}
#cy{position:absolute;inset:0;background:#0d1117}
/* graph overlay text */
#graph-stats{position:absolute;top:6px;left:8px;font-size:11px;color:#484f58;pointer-events:none;z-index:5}
/* color legend */
#legend{position:absolute;bottom:6px;left:8px;display:flex;flex-wrap:wrap;gap:4px;pointer-events:none;z-index:5;max-width:50%}
.li{display:flex;align-items:center;gap:4px;background:rgba(13,17,23,.82);padding:2px 7px;border-radius:3px;font-size:11px}
.ld{width:10px;height:10px;border-radius:2px;flex-shrink:0}
/* pin hint */
#pinhint{position:absolute;top:6px;right:8px;font-size:11px;color:#484f58;pointer-events:none;z-index:5}
/* node/edge info panel */
#node-info{padding:8px 10px;font-size:12px;border-top:1px solid #30363d;background:#161b22;display:none;max-height:95px;overflow-y:auto;line-height:1.7;flex-shrink:0}
/* hover tooltip */
#tooltip{position:fixed;background:#161b22;border:1px solid #30363d;border-radius:4px;padding:6px 10px;font-size:11px;color:#c9d1d9;pointer-events:none;z-index:50;display:none;max-width:260px;line-height:1.6;white-space:pre-wrap}
/* fullscreen */
#graph-wrap:fullscreen{background:#0d1117}
#graph-wrap:-webkit-full-screen{background:#0d1117}
#graph-wrap:fullscreen #cy,#graph-wrap:-webkit-full-screen #cy{position:absolute;inset:0}
/* login overlay */
#overlay{position:fixed;inset:0;background:rgba(0,0,0,.8);display:flex;align-items:center;justify-content:center;z-index:100}
#login{background:#161b22;border:1px solid #30363d;padding:28px;min-width:280px;border-radius:8px}
#login h2{color:#58a6ff;margin-bottom:18px;font-size:1em;letter-spacing:1px}
#login input{display:block;width:100%;margin-bottom:10px;padding:7px 10px;font-size:13px}
#lerr{color:#f85149;font-size:12px;margin-top:6px;min-height:18px}
/* custom modal */
#modal{position:fixed;inset:0;background:rgba(0,0,0,.7);display:none;align-items:center;justify-content:center;z-index:300}
#modal.show{display:flex}
#modal-box{background:#161b22;border:1px solid #30363d;border-radius:8px;padding:22px 24px;min-width:260px;max-width:400px}
#modal-msg{color:#c9d1d9;font-size:13px;margin-bottom:16px;line-height:1.5;white-space:pre-line}
#modal-btns{display:flex;gap:8px;justify-content:flex-end}
/* saved views modal */
#views-modal{position:fixed;inset:0;background:rgba(0,0,0,.7);display:none;align-items:center;justify-content:center;z-index:200}
#views-modal.show{display:flex}
#views-box{background:#161b22;border:1px solid #30363d;border-radius:8px;padding:22px 24px;min-width:340px;max-width:500px;width:90%;display:flex;flex-direction:column;max-height:70vh}
#views-box h3{color:#58a6ff;font-size:13px;margin-bottom:14px;letter-spacing:.5px}
#views-list{overflow-y:auto;flex:1;margin-bottom:14px;min-height:40px}
.view-row{display:flex;align-items:center;gap:8px;padding:7px 0;border-bottom:1px solid #21262d}
.view-row:last-child{border-bottom:none}
.view-name{flex:1;color:#c9d1d9;font-size:12px;cursor:pointer;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.view-name:hover{color:#58a6ff}
.view-date{font-size:11px;color:#484f58;white-space:nowrap;flex-shrink:0}
.view-del{background:none;border:none;color:#484f58;cursor:pointer;padding:0 4px;font-size:14px;line-height:1;flex-shrink:0}
.view-del:hover{color:#f85149;background:none}
#views-footer{display:flex;justify-content:flex-end}
</style>
</head><body>

<!-- Hover tooltip -->
<div id="tooltip"></div>

<!-- Custom confirm modal -->
<div id="modal">
  <div id="modal-box">
    <div id="modal-msg"></div>
    <div id="modal-btns">
      <button id="modal-no">Cancel</button>
      <button id="modal-yes" class="danger">Confirm</button>
    </div>
  </div>
</div>

<!-- Saved views modal -->
<div id="views-modal">
  <div id="views-box">
    <h3>SAVED VIEWS</h3>
    <div id="views-list"></div>
    <div id="views-footer">
      <button onclick="closeViewsModal()">Close</button>
    </div>
  </div>
</div>

<!-- Login overlay -->
<div id="overlay" style="display:none">
  <div id="login">
    <h2>⬡ minigdb</h2>
    <input id="lu" placeholder="username" autocomplete="username">
    <input id="lp" type="password" placeholder="password" autocomplete="current-password">
    <button onclick="doLogin()">Sign in</button>
    <div id="lerr"></div>
  </div>
</div>

<div id="hdr">
  <img src="/assets/minigdb_logo.webp" alt="minigdb" style="height:24px;width:24px;object-fit:contain">
  <h1>minigdb</h1>
  <select id="gsel" onchange="switchGraph(this.value)" title="Active graph"></select>
  <button onclick="newGraph()">+ Graph</button>
  <button onclick="dropGraph()" class="danger">✕ Drop</button>
  <span id="status"></span>
</div>

<div id="main">
  <div id="left">
    <div id="editor-wrap">
      <textarea id="gql" spellcheck="false"
        placeholder="GQL  ·  Ctrl+Enter: run  ·  Ctrl+Shift+Enter: visualize&#10;Shift+↑/↓: query history&#10;&#10;MATCH (n:Person) RETURN n.name, n.age&#10;INSERT (:Person {name: &quot;Alice&quot;, age: 30})&#10;MATCH (a)-[r]->(b) RETURN a, r, b"></textarea>
      <div id="hist-nav"></div>
    </div>
    <div id="btns">
      <button onclick="runQuery()" title="Ctrl+Enter">▶ Run</button>
      <button onclick="vizQuery()" title="Ctrl+Shift+Enter">⬡ Visualize</button>
      <button id="modeBtn" onclick="toggleMode()" title="Replace: clears view&#10;Add: merges into view">↔ Replace</button>
      <button onclick="exportCSV()" title="Export results as CSV">↓ CSV</button>
    </div>
    <div id="txnbar">
      <span id="txn-status">No transaction</span>
      <button id="btn-begin"    class="txn-begin"   onclick="txnCmd('BEGIN')">BEGIN</button>
      <button id="btn-commit"   class="txn-commit"  onclick="txnCmd('COMMIT')"   style="display:none">COMMIT</button>
      <button id="btn-rollback" class="txn-rollback" onclick="txnCmd('ROLLBACK')" style="display:none">ROLLBACK</button>
    </div>
    <div id="results"><div class="info">Run a GQL query to see results.</div></div>
  </div>

  <div id="drag-handle"></div>

  <div id="right">
    <div id="gtbar">
      <!-- Col 1 row 1: Layout selector -->
      <div class="gtcol"><label>Layout</label>
        <select id="layoutSel" onchange="runLayout(true)">
          <option value="fcose">Force-directed</option>
          <option value="circle">Circular</option>
          <option value="concentric">Concentric</option>
          <option value="dagre">Hierarchical</option>
          <option value="multipartite">Multipartite</option>
          <option value="grid">Grid</option>
        </select>
      </div>
      <!-- Col 2 row 1: Save View -->
      <div class="gtcol">
        <button id="saveViewBtn" onclick="saveView()" title="Save current graph view as a named view" disabled>💾 Save View</button>
      </div>
      <!-- Col 3 row 1: Re-run + Unpin -->
      <div class="gtcol">
        <button onclick="runLayout(true)" title="Re-run layout">⟳</button>
        <button onclick="unpinAll()" title="Release all pinned nodes">⊘</button>
      </div>
      <!-- Col 4 row 1: Fullscreen -->
      <div class="gtcol">
        <button onclick="toggleFullscreen()" title="Fullscreen graph">⤢</button>
      </div>
      <!-- Col 1 row 2: Color selector -->
      <div class="gtcol"><label>Color</label>
        <select id="colorBy" onchange="updateColors()"><option value="__label__">Type</option></select>
      </div>
      <!-- Col 2 row 2: Views -->
      <div class="gtcol">
        <button onclick="openViewsModal()" title="Load or manage saved views">📂 Views</button>
      </div>
      <!-- Col 3 row 2: Fit + Labels -->
      <div class="gtcol">
        <button onclick="resetView()" title="Fit all nodes in view">⛶</button>
        <button id="lblBtn" onclick="toggleLabels()" title="Show/hide labels">⌗</button>
      </div>
      <!-- Col 4 row 2: Filter input -->
      <div class="gtcol">
        <input id="filter-input" placeholder="Filter nodes…" oninput="filterNodes(this.value)" title="Filter nodes by label or property">
      </div>
    </div>

    <div id="graph-wrap">
      <div id="cy"></div>
      <div id="graph-stats"></div>
      <div id="legend"></div>
      <div id="pinhint">Drag to pin · Right-click to unpin · Del to remove</div>
    </div>
    <div id="node-info">
      <button id="expand-btn" onclick="expandHop()" title="Load one hop of neighbours for selected nodes" style="display:none;float:right;margin-left:8px;padding:2px 8px;background:#21262d;border:1px solid #30363d;color:#c9d1d9;border-radius:4px;cursor:pointer;font-size:11px">⊕ Expand</button>
    </div>
  </div>
</div>

<script>
'use strict';

// ── State ──────────────────────────────────────────────────────────────────────
let token         = sessionStorage.getItem('mgdb_token') || '';
let currentGraph  = 'default';
let cy            = null;
let addMode       = false;
let layoutRunning = false;
let layoutInst    = null;
let labelsVisible = true;
let currentRows   = [];
let sortCol       = null;
let sortDir       = 1;   // 1 = asc, -1 = desc
let inTxn         = false;

// ── Query history ──────────────────────────────────────────────────────────────
const MAX_HIST = 30;
let histList = JSON.parse(localStorage.getItem('mgdb_hist') || '[]');
let histIdx  = -1;

function pushHistory(q) {
  if (!q.trim() || histList[0] === q) { histIdx = -1; return; }
  histList.unshift(q);
  if (histList.length > MAX_HIST) histList.pop();
  localStorage.setItem('mgdb_hist', JSON.stringify(histList));
  histIdx = -1;
}

function updateHistNav() {
  document.getElementById('hist-nav').textContent =
    histIdx >= 0 ? `hist ${histIdx + 1}/${histList.length}` : '';
}

document.getElementById('gql').addEventListener('keydown', e => {
  if (!e.shiftKey) return;
  if (e.key === 'ArrowUp') {
    e.preventDefault();
    if (!histList.length) return;
    histIdx = Math.min(histIdx + 1, histList.length - 1);
    document.getElementById('gql').value = histList[histIdx];
    updateHistNav();
  } else if (e.key === 'ArrowDown') {
    e.preventDefault();
    if (histIdx <= 0) { histIdx = -1; document.getElementById('gql').value = ''; }
    else { histIdx--; document.getElementById('gql').value = histList[histIdx]; }
    updateHistNav();
  }
});

// ── Custom confirm modal ───────────────────────────────────────────────────────
function customConfirm(msg) {
  return new Promise(resolve => {
    document.getElementById('modal-msg').textContent = msg;
    document.getElementById('modal').classList.add('show');
    const close = v => {
      document.getElementById('modal').classList.remove('show');
      resolve(v);
    };
    document.getElementById('modal-yes').addEventListener('click', () => close(true),  { once: true });
    document.getElementById('modal-no').addEventListener('click',  () => close(false), { once: true });
  });
}
document.addEventListener('keydown', e => {
  if (e.key === 'Escape') {
    if (document.getElementById('modal').classList.contains('show'))
      document.getElementById('modal').classList.remove('show');
    if (document.getElementById('views-modal').classList.contains('show'))
      closeViewsModal();
  }
});

// ── Color palette ──────────────────────────────────────────────────────────────
const PALETTE = [
  '#4e9af1','#ff7b54','#7bed9f','#eccc68','#a29bfe',
  '#fd79a8','#55efc4','#fdcb6e','#e17055','#74b9ff',
  '#badc58','#f9ca24','#6ab04c','#eb4d4b','#686de0'
];
const colorMap = {};
let palIdx = 0;
function getColor(k) {
  if (!colorMap[k]) colorMap[k] = PALETTE[palIdx++ % PALETTE.length];
  return colorMap[k];
}

// Return '#000000' or '#ffffff' — whichever has more contrast against `hex`.
function contrastColor(hex) {
  const c = hex.replace('#', '');
  const r = parseInt(c.slice(0, 2), 16);
  const g = parseInt(c.slice(2, 4), 16);
  const b = parseInt(c.slice(4, 6), 16);
  // WCAG relative luminance (linearise sRGB, then weight channels)
  const lin = v => { v /= 255; return v <= 0.04045 ? v / 12.92 : Math.pow((v + 0.055) / 1.055, 2.4); };
  const L = 0.2126 * lin(r) + 0.7152 * lin(g) + 0.0722 * lin(b);
  return L > 0.179 ? '#000000' : '#ffffff';
}

// ── API ────────────────────────────────────────────────────────────────────────
async function api(path, opts = {}) {
  const hdrs = { 'Content-Type': 'application/json' };
  if (token) hdrs['Authorization'] = 'Bearer ' + token;
  let res;
  try { res = await fetch(path, { ...opts, headers: { ...hdrs, ...(opts.headers || {}) } }); }
  catch (e) { return { error: e.message }; }
  if (res.status === 401) { showLogin(); return null; }
  try { return await res.json(); } catch { return { error: 'bad JSON from server' }; }
}

// ── Auth ───────────────────────────────────────────────────────────────────────
function showLogin() {
  document.getElementById('overlay').style.display = 'flex';
  setTimeout(() => document.getElementById('lu').focus(), 60);
}
async function doLogin() {
  const u = document.getElementById('lu').value.trim();
  const p = document.getElementById('lp').value;
  document.getElementById('lerr').textContent = '';
  const res = await fetch('/api/auth', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ user: u, password: p })
  });
  const d = await res.json();
  if (!res.ok) { document.getElementById('lerr').textContent = d.error || 'Login failed'; return; }
  token = d.token;
  sessionStorage.setItem('mgdb_token', token);
  document.getElementById('overlay').style.display = 'none';
  await loadGraphs(); initCy();
}
document.getElementById('lp').addEventListener('keydown', e => { if (e.key === 'Enter') doLogin(); });

// ── Startup ────────────────────────────────────────────────────────────────────
async function init() {
  const info = await api('/api/info');
  if (!info) return;
  if (info.auth_required && !token) { showLogin(); return; }
  await loadGraphs(); initCy();
}

// ── Graph management ───────────────────────────────────────────────────────────
async function loadGraphs() {
  const d = await api('/api/graphs');
  if (!d || d.error) return;
  const sel = document.getElementById('gsel');
  const prev = currentGraph;
  sel.innerHTML = d.graphs.map(g =>
    `<option value="${esc(g)}"${g === prev ? ' selected' : ''}>${esc(g)}</option>`
  ).join('');
  currentGraph = sel.value || 'default';
}
function switchGraph(name) { currentGraph = name; setStatus('Graph: ' + name); }

async function newGraph() {
  const name = prompt('New graph name:');
  if (!name) return;
  const r = await api('/api/graphs', { method: 'POST', body: JSON.stringify({ name }) });
  if (r && r.error) { alert(r.error); return; }
  await loadGraphs();
  document.getElementById('gsel').value = name;
  switchGraph(name);
}

async function dropGraph() {
  const ok = await customConfirm(`Delete graph "${currentGraph}"?\nThis cannot be undone.`);
  if (!ok) return;
  const r = await api(`/api/graphs/${encodeURIComponent(currentGraph)}`, { method: 'DELETE' });
  if (r && r.error) { alert(r.error); return; }
  await loadGraphs();
}

// ── Transaction ────────────────────────────────────────────────────────────────
async function txnCmd(cmd) {
  setStatus(cmd + '…');
  const d = await api('/api/query', {
    method: 'POST',
    body: JSON.stringify({ graph: currentGraph, query: cmd })
  });
  if (!d) return;
  if (d.error) { setStatus('Error'); showError(d.error); return; }
  if (cmd === 'BEGIN')                       inTxn = true;
  if (cmd === 'COMMIT' || cmd === 'ROLLBACK') inTxn = false;
  updateTxnUI();
  setStatus(cmd + ' OK');
}

function updateTxnUI() {
  document.getElementById('txn-status').textContent = inTxn ? 'Transaction active' : 'No transaction';
  document.getElementById('txn-status').className   = inTxn ? 'active' : '';
  document.getElementById('btn-begin').style.display    = inTxn ? 'none' : '';
  document.getElementById('btn-commit').style.display   = inTxn ? '' : 'none';
  document.getElementById('btn-rollback').style.display = inTxn ? '' : 'none';
}

// ── Query ──────────────────────────────────────────────────────────────────────
function setStatus(m) { document.getElementById('status').textContent = m; }

async function runQuery() {
  const q = document.getElementById('gql').value.trim();
  if (!q) return;
  pushHistory(q);
  setStatus('Running…');
  const t = Date.now();
  // Use /api/viz so that node/edge variables in results auto-populate the graph panel.
  const d = await api('/api/viz', { method: 'POST', body: JSON.stringify({ graph: currentGraph, query: q }) });
  if (!d) return;
  if (d.error) { setStatus('Error'); showError(d.error); return; }
  // Sync transaction state if BEGIN/COMMIT/ROLLBACK was typed directly.
  const ql = q.toUpperCase().trim();
  if (ql === 'BEGIN')                            { inTxn = true;  updateTxnUI(); }
  else if (ql === 'COMMIT' || ql === 'ROLLBACK') { inTxn = false; updateTxnUI(); }
  setStatus(`${(d.rows || []).length} row(s) · ${Date.now() - t}ms`);
  currentRows = d.rows || [];
  sortCol = null; sortDir = 1;
  renderTable(currentRows);
  // Auto-render graph if any nodes or edges were resolved from the results.
  if ((d.nodes || []).length > 0 || (d.edges || []).length > 0) {
    renderGraph(d);
  }
}

async function vizQuery() {
  const q = document.getElementById('gql').value.trim();
  if (!q) return;
  pushHistory(q);
  setStatus('Visualizing…');
  const t = Date.now();
  const d = await api('/api/viz', { method: 'POST', body: JSON.stringify({ graph: currentGraph, query: q }) });
  if (!d) return;
  if (d.error) { setStatus('Error'); showError(d.error); return; }
  const nn = (d.nodes || []).length, ne = (d.edges || []).length;
  setStatus(`${nn} node${nn !== 1 ? 's' : ''} · ${ne} edge${ne !== 1 ? 's' : ''} · ${Date.now() - t}ms`);
  currentRows = d.rows || [];
  sortCol = null; sortDir = 1;
  renderTable(currentRows);
  renderGraph(d);
}

// ── Expand Hop ────────────────────────────────────────────────────────────────
// Load one hop of neighbours for the currently selected nodes in the graph view.
// Builds a MATCH query that matches any of the selected node IDs and traverses
// one undirected hop, then merges the new nodes/edges into the current view.
async function expandHop() {
  if (!cy) return;
  const selected = cy.nodes(':selected');
  const seeds = selected.length > 0 ? selected : cy.nodes();
  if (!seeds.length) { setStatus('No nodes to expand'); return; }

  // Build OR-chain: n.id = "id1" OR n.id = "id2" ...
  // We use MATCH (n) WHERE n = "ulid" syntax since IDs are ULIDs stored as node IDs.
  const ids = seeds.map(n => n.id());
  // Build a WHERE OR-chain using id(n) = 'ulid' — same pattern as nodeIdsToQuery().
  const conds = ids.map(id => `id(n) = '${id}'`).join(' OR ');
  const gql = `MATCH (n)-[r]-(m) WHERE ${conds} RETURN n, r, m`;

  setStatus('Expanding…');
  const t = Date.now();
  const prevAdd = addMode;
  addMode = true; // always merge into existing view
  try {
    const d = await api('/api/viz', { method: 'POST', body: JSON.stringify({ graph: currentGraph, query: gql }) });
    if (!d) return;
    if (d.error) { setStatus('Expand error'); showError(d.error); return; }
    const nn = (d.nodes || []).length, ne = (d.edges || []).length;
    setStatus(`Expanded: +${nn} node${nn !== 1 ? 's' : ''}, +${ne} edge${ne !== 1 ? 's' : ''} · ${Date.now() - t}ms`);
    renderGraph(d);
  } finally {
    addMode = prevAdd;
  }
}

// ── Replace / Add toggle ───────────────────────────────────────────────────────
function toggleMode() {
  addMode = !addMode;
  const btn = document.getElementById('modeBtn');
  btn.textContent = addMode ? '➕ Add' : '↔ Replace';
  btn.classList.toggle('active', addMode);
}

// ── Table ──────────────────────────────────────────────────────────────────────
const ULID_RE = /^[0-9A-HJKMNP-TV-Z]{26}$/;

function esc(s) {
  return String(s)
    .replace(/&/g, '&amp;').replace(/</g, '&lt;')
    .replace(/>/g, '&gt;').replace(/"/g, '&quot;');
}

function fmtCell(v) {
  if (v === null || v === undefined) return '<span class="null">null</span>';
  const s = typeof v === 'object' ? JSON.stringify(v) : String(v);
  const display = s.length > 72 ? s.slice(0, 69) + '…' : s;
  // Clickable ULID if it resolves to a graph element in the current view
  if (ULID_RE.test(s) && cy && cy.getElementById(s).length) {
    return `<span class="id-link" onclick="highlightElement('${esc(s)}')" title="Highlight in graph: ${esc(s)}">${esc(display)}</span>`;
  }
  return esc(display);
}

function highlightElement(id) {
  if (!cy) return;
  const el = cy.getElementById(id);
  if (!el.length) return;
  cy.elements().unselect();
  el.select();
  cy.animate({ center: { eles: el }, zoom: Math.max(cy.zoom(), 1.5) }, { duration: 300 });
}

function renderTable(rows) {
  const div = document.getElementById('results');
  if (!rows.length) { div.innerHTML = '<div class="info">(no results)</div>'; return; }
  const cols = Object.keys(rows[0]);
  // apply sort
  let sorted = [...rows];
  if (sortCol !== null && cols.includes(sortCol)) {
    sorted.sort((a, b) => {
      const av = a[sortCol], bv = b[sortCol];
      if (av === null || av === undefined) return 1;
      if (bv === null || bv === undefined) return -1;
      return av < bv ? -sortDir : av > bv ? sortDir : 0;
    });
  }
  const hdr = cols.map(c => {
    const cls = c === sortCol ? (sortDir === 1 ? 'sort-asc' : 'sort-desc') : '';
    return `<th class="${cls}" onclick="sortTable('${esc(c)}')">${esc(c)}<span class="sa"></span></th>`;
  }).join('');
  div.innerHTML =
    '<table><thead><tr>' + hdr + '</tr></thead><tbody>' +
    sorted.map(r =>
      '<tr>' + cols.map(c => {
        const raw = typeof r[c] === 'object' ? JSON.stringify(r[c] ?? '') : String(r[c] ?? '');
        return `<td title="${esc(raw)}">${fmtCell(r[c])}</td>`;
      }).join('') + '</tr>'
    ).join('') +
    '</tbody></table>';
}

function sortTable(col) {
  if (sortCol === col) sortDir = -sortDir;
  else { sortCol = col; sortDir = 1; }
  renderTable(currentRows);
}

function showError(msg) {
  document.getElementById('results').innerHTML = `<div class="err">Error: ${esc(msg)}</div>`;
}

// ── CSV export ─────────────────────────────────────────────────────────────────
function exportCSV() {
  if (!currentRows.length) return;
  const cols = Object.keys(currentRows[0]);
  const lines = [cols.join(',')];
  for (const r of currentRows) {
    lines.push(cols.map(c => {
      const v = r[c];
      if (v === null || v === undefined) return '';
      const s = typeof v === 'object' ? JSON.stringify(v) : String(v);
      return (s.includes(',') || s.includes('"') || s.includes('\n'))
        ? '"' + s.replace(/"/g, '""') + '"' : s;
    }).join(','));
  }
  const a = document.createElement('a');
  a.href = URL.createObjectURL(new Blob([lines.join('\n')], { type: 'text/csv' }));
  a.download = 'results.csv';
  a.click();
  setTimeout(() => URL.revokeObjectURL(a.href), 1000);
}

// ── Cytoscape init ─────────────────────────────────────────────────────────────
function initCy() {
  cy = cytoscape({
    container: document.getElementById('cy'),
    style: [
      {
        selector: 'node', style: {
          'background-color': '#21262d', 'border-color': '#58a6ff', 'border-width': 2,
          'color': '#c9d1d9', 'label': 'data(dispLabel)', 'font-size': 7,
          'text-valign': 'center', 'text-halign': 'center',
          'width': 46, 'height': 46, 'text-wrap': 'wrap', 'text-max-width': 84,
          'text-background-color': '#21262d', 'text-background-opacity': 0.88,
          'text-background-padding': '3px', 'text-background-shape': 'roundrectangle'
        }
      },
      { selector: 'node:selected', style: { 'border-color': '#79c0ff', 'border-width': 3, 'border-style': 'solid' } },
      { selector: 'node.pinned',   style: { 'border-style': 'dashed', 'border-color': '#f0883e', 'border-width': 3 } },
      { selector: 'node.faded',    style: { 'opacity': 0.15 } },
      { selector: 'node.no-label', style: { 'label': '', 'text-background-opacity': 0 } },
      { selector: 'edge.no-label', style: { 'label': '' } },
      {
        selector: 'edge', style: {
          'line-color': '#30363d', 'target-arrow-color': '#30363d',
          'target-arrow-shape': 'triangle', 'curve-style': 'bezier',
          'label': 'data(label)', 'font-size': 7, 'color': '#8b949e', 'width': 1.5,
          'text-background-color': '#0d1117', 'text-background-opacity': 1, 'text-background-padding': '2px'
        }
      },
      { selector: 'edge:selected', style: { 'line-color': '#58a6ff', 'target-arrow-color': '#58a6ff', 'width': 2.5 } },
      { selector: 'edge.faded',    style: { 'opacity': 0.08 } }
    ],
    layout: { name: 'grid' }
  });

  const tooltip = document.getElementById('tooltip');

  // ── Tap node → show properties in info panel
  cy.on('tap', 'node', e => {
    const d = e.target.data();
    const info = document.getElementById('node-info');
    info.style.display = 'block';
    document.getElementById('expand-btn').style.display = 'inline-block';
    const props = Object.entries(d)
      .filter(([k]) => !['id', 'dispLabel', 'labels'].includes(k))
      .map(([k, v]) => `<b style="color:#58a6ff">${esc(k)}</b>: ${esc(String(v))}`)
      .join(' &nbsp;·&nbsp; ');
    const pinnedBadge = e.target.hasClass('pinned')
      ? ' <span style="color:#f0883e;font-size:11px">[pinned]</span>' : '';
    info.innerHTML =
      `<button id="expand-btn" onclick="expandHop()" title="Load one hop of neighbours for selected nodes" style="float:right;margin-left:8px;padding:2px 8px;background:#21262d;border:1px solid #30363d;color:#c9d1d9;border-radius:4px;cursor:pointer;font-size:11px">⊕ Expand</button>` +
      `<span style="color:#7ee787">NODE</span> ` +
      `<span style="color:#79c0ff">${esc(d.labels || '(no label)')}</span>${pinnedBadge} ` +
      `<span class="id-link" onclick="highlightElement('${esc(d.id)}')" title="${esc(d.id)}">${esc(d.id.slice(0, 13))}…</span><br>` +
      (props || '<span style="color:#484f58">no properties</span>');
  });

  // ── Tap edge → show edge info in panel
  cy.on('tap', 'edge', e => {
    const d = e.target.data();
    const info = document.getElementById('node-info');
    info.style.display = 'block';
    const props = Object.entries(d)
      .filter(([k]) => !['id', 'source', 'target', 'label'].includes(k))
      .map(([k, v]) => `<b style="color:#58a6ff">${esc(k)}</b>: ${esc(String(v))}`)
      .join(' &nbsp;·&nbsp; ');
    info.innerHTML =
      `<span style="color:#d2a8ff">EDGE</span> ` +
      `<span style="color:#f0883e">${esc(d.label || '(no label)')}</span> ` +
      `<span style="color:#484f58;font-size:11px" title="${esc(d.id)}">${esc(d.id.slice(0, 13))}…</span><br>` +
      `<span style="color:#8b949e">` +
      `${esc(d.source.slice(0, 10))}… → ${esc(d.target.slice(0, 10))}…</span>` +
      (props ? '<br>' + props : '');
  });

  // ── Tap canvas → hide info panel
  cy.on('tap', e => {
    if (e.target === cy) document.getElementById('node-info').style.display = 'none';
  });

  // ── Drag → pin node
  cy.on('dragfree', 'node', e => {
    e.target.lock();
    e.target.addClass('pinned');
  });

  // ── Right-click → unpin
  cy.on('cxttap', 'node', e => {
    e.target.unlock();
    e.target.removeClass('pinned');
  });

  // ── Hover tooltip
  cy.on('mouseover', 'node', e => {
    const d = e.target.data();
    const props = Object.entries(d)
      .filter(([k]) => !['id', 'dispLabel', 'labels'].includes(k))
      .slice(0, 5)
      .map(([k, v]) => `${k}: ${String(v)}`)
      .join('\n');
    tooltip.textContent = (d.labels || 'node') + (props ? '\n' + props : '');
    tooltip.style.display = 'block';
  });

  cy.on('mouseover', 'edge', e => {
    const d = e.target.data();
    tooltip.textContent = `→ ${d.label || 'edge'}`;
    tooltip.style.display = 'block';
  });

  cy.on('mouseout', 'node,edge', () => { tooltip.style.display = 'none'; });

  cy.on('mousemove', e => {
    const oe = e.originalEvent;
    if (!oe) return;
    // Use actual rendered dimensions so the flip stays tight to the cursor.
    const tw = tooltip.offsetWidth  + 12;
    const th = tooltip.offsetHeight + 12;
    let tx = oe.clientX + 16;
    let ty = oe.clientY + 16;
    if (tx + tw > window.innerWidth)  tx = oe.clientX - tw;
    if (ty + th > window.innerHeight) ty = oe.clientY - th;
    tooltip.style.left = Math.max(4, tx) + 'px';
    tooltip.style.top  = Math.max(4, ty) + 'px';
  });
}

// ── Graph data render ──────────────────────────────────────────────────────────
function renderGraph(data) {
  if (!cy) return;
  if (!addMode) {
    cy.elements().remove();
    document.getElementById('node-info').style.display = 'none';
  }
  const toAdd = [];
  for (const n of (data.nodes || [])) {
    if (cy.getElementById(n.id).length) continue;
    const labels = (n.labels || []).join(':');
    const props = n.properties || {};
    const PREF = ['name','title','label','caption','key','id_name','username','email'];
    const bestKey = PREF.find(k => props[k] !== undefined)
      || Object.keys(props).find(k => typeof props[k] === 'string')
      || Object.keys(props)[0];
    const bestVal = bestKey !== undefined ? String(props[bestKey]) : n.id.slice(0, 8);
    const dispLabel = (labels ? labels + '\n' : '') + bestVal;
    toAdd.push({ group: 'nodes', data: { id: n.id, labels, dispLabel, ...n.properties } });
  }
  for (const e of (data.edges || [])) {
    if (cy.getElementById(e.id).length) continue;
    toAdd.push({ group: 'edges', data: { id: e.id, source: e.source, target: e.target, label: e.label } });
  }
  if (!toAdd.length) return;
  cy.add(toAdd);
  refreshColorByOptions();
  updateColors();
  updateGraphStats();
  if (!labelsVisible) applyLabelVisibility();
  runLayout(true);
  updateSaveViewBtn();
}

// ── Layout ─────────────────────────────────────────────────────────────────────
function layoutOpts(name, fit, randomize = true) {
  const base = { animate: true, animationDuration: 480, fit };
  switch (name) {
    case 'fcose':      return { ...base, name: 'fcose', nodeRepulsion: 14000, idealEdgeLength: 130, nodeSeparation: 120, randomize };
    case 'cose':       return { ...base, name: 'cose',  nodeRepulsion: 12000, padding: 40 };
    case 'circle':     return { ...base, name: 'circle', padding: 28 };
    case 'concentric': return { ...base, name: 'concentric', padding: 28, minNodeSpacing: 60 };
    case 'dagre':      return { ...base, name: 'dagre', rankDir: 'TB', spacingFactor: 1.5 };
    case 'grid':       return { ...base, name: 'grid', padding: 28 };
    default:           return { ...base, name: 'cose',  nodeRepulsion: 12000, padding: 40 };
  }
}

function multipartitePositions() {
  const groups = {};
  cy.nodes().forEach(n => {
    const type = (n.data('labels') || '?').split(':')[0] || '?';
    if (!groups[type]) groups[type] = [];
    groups[type].push(n.id());
  });
  const types = Object.keys(groups).sort();
  const colGap = 200, rowGap = 90;
  const positions = {};
  types.forEach((type, col) => {
    const ids = groups[type];
    const colOffset = (col - (types.length - 1) / 2) * colGap;
    ids.forEach((id, row) => {
      const rowOffset = (row - (ids.length - 1) / 2) * rowGap;
      positions[id] = { x: colOffset, y: rowOffset };
    });
  });
  return positions;
}

function nodesArePositioned() {
  let spread = 0;
  cy.nodes().forEach(n => { const p = n.position(); spread += Math.abs(p.x) + Math.abs(p.y); });
  return spread > cy.nodes().length * 5;
}

// For force-directed layouts (cose/fcose): run computation silently,
// then tween from current positions to computed positions so the motion
// is smooth — identical to how dagre/circle/etc. animate.
function runForceLayout(name, fit) {
  const randomize = !nodesArePositioned();

  // Save current positions so we can restore them before tweening.
  const savedPos = {};
  cy.nodes().forEach(n => { savedPos[n.id()] = { ...n.position() }; });

  const computeWith = (layoutName) => {
    try {
      // Compute positions instantly with no visual output.
      const computeLayout = cy.layout({
        ...layoutOpts(layoutName, false, randomize),
        animate: false
      });
      computeLayout.on('layoutstop', () => {
        // Capture the computed final positions.
        const finalPos = {};
        cy.nodes().forEach(n => { finalPos[n.id()] = { ...n.position() }; });

        // Restore nodes to where they were before computation.
        cy.nodes().forEach(n => { n.position(savedPos[n.id()]); });

        // Smoothly tween from saved → final positions.
        layoutInst = cy.layout({ name: 'preset', positions: finalPos, animate: true, animationDuration: 500, fit, padding: 40 });
        layoutInst.on('layoutstop', () => { layoutRunning = false; layoutInst = null; });
        layoutInst.run();
      });
      computeLayout.run();
    } catch (_) {
      if (layoutName !== 'cose') {
        computeWith('cose');
      } else {
        cy.nodes().forEach(n => { n.position(savedPos[n.id()]); });
        layoutRunning = false;
      }
    }
  };
  computeWith(name);
}

function runLayout(fit = false) {
  if (!cy || !cy.nodes().length) return;
  if (layoutRunning && layoutInst) { try { layoutInst.stop(); } catch (_) {} }
  const name = document.getElementById('layoutSel').value;
  layoutRunning = true;

  if (name === 'fcose' || name === 'cose') {
    runForceLayout(name, fit);
    return;
  }
  if (name === 'multipartite') {
    layoutInst = cy.layout({ name: 'preset', positions: multipartitePositions(), animate: true, animationDuration: 480, fit, padding: 40 });
    layoutInst.on('layoutstop', () => { layoutRunning = false; layoutInst = null; });
    layoutInst.run();
    return;
  }
  // dagre / circle / concentric / grid — these compute positions first
  // then Cytoscape tweens to them natively with animate:true.
  try {
    layoutInst = cy.layout(layoutOpts(name, fit));
    layoutInst.on('layoutstop', () => { layoutRunning = false; layoutInst = null; });
    layoutInst.run();
  } catch (_) {
    layoutRunning = false;
  }
}

function resetView() { if (cy) cy.fit(undefined, 28); }

function unpinAll() {
  if (!cy) return;
  cy.nodes().unlock();
  cy.nodes().removeClass('pinned');
}

// ── Labels ─────────────────────────────────────────────────────────────────────
function applyLabelVisibility() {
  if (!cy) return;
  cy.nodes().toggleClass('no-label', !labelsVisible);
  cy.edges().toggleClass('no-label', !labelsVisible);
}

function toggleLabels() {
  labelsVisible = !labelsVisible;
  applyLabelVisibility();
  document.getElementById('lblBtn').classList.toggle('active', !labelsVisible);
}

// ── Fullscreen ─────────────────────────────────────────────────────────────────
function toggleFullscreen() {
  const el = document.getElementById('graph-wrap');
  if (!document.fullscreenElement) {
    el.requestFullscreen().then(() => { if (cy) cy.resize(); }).catch(() => {});
  } else {
    document.exitFullscreen();
  }
}
document.addEventListener('fullscreenchange', () => { if (cy) { cy.resize(); cy.fit(undefined, 28); } });

// ── Filter nodes ───────────────────────────────────────────────────────────────
function filterNodes(q) {
  if (!cy) return;
  q = q.toLowerCase().trim();
  if (!q) { cy.elements().removeClass('faded'); return; }
  const matchedIds = new Set();
  cy.nodes().forEach(n => {
    const text = [n.data('labels'), ...Object.values(n.data())].join(' ').toLowerCase();
    if (text.includes(q)) matchedIds.add(n.id());
  });
  cy.nodes().forEach(n => {
    n[matchedIds.has(n.id()) ? 'removeClass' : 'addClass']('faded');
  });
  cy.edges().forEach(e => {
    const connected = matchedIds.has(e.source().id()) || matchedIds.has(e.target().id());
    e[connected ? 'removeClass' : 'addClass']('faded');
  });
}

// ── Graph stats overlay ────────────────────────────────────────────────────────
function updateGraphStats() {
  if (!cy) return;
  const n = cy.nodes().length, e = cy.edges().length;
  document.getElementById('graph-stats').textContent = n ? `${n} nodes · ${e} edges` : '';
}

// ── Color coding ───────────────────────────────────────────────────────────────
function refreshColorByOptions() {
  const props = new Set();
  cy.nodes().forEach(n => {
    Object.keys(n.data()).forEach(k => {
      if (!['id', 'dispLabel', 'labels'].includes(k) && typeof n.data(k) !== 'object') props.add(k);
    });
  });
  const sel = document.getElementById('colorBy');
  const cur = sel.value;
  sel.innerHTML = '<option value="__label__">Type</option>' +
    [...props].map(p => `<option value="${esc(p)}"${p === cur ? ' selected' : ''}>${esc(p)}</option>`).join('');
  if (cur && sel.querySelector(`option[value="${CSS.escape(cur)}"]`)) sel.value = cur;
}

function updateColors() {
  if (!cy) return;
  const mode = document.getElementById('colorBy').value;
  const seen = new Set();
  cy.nodes().forEach(n => {
    const rawKey = mode === '__label__'
      ? ((n.data('labels') || '?').split(':')[0] || '?')
      : String(n.data(mode) ?? 'null');
    const mapKey = mode === '__label__' ? rawKey : (mode + ':' + rawKey);
    const bg = getColor(mapKey);
    n.style('background-color', bg);
    n.style('color', contrastColor(bg));
    n.style('text-background-color', bg);
    seen.add(mapKey);
  });
  document.getElementById('legend').innerHTML = [...seen].map(k => {
    const label = mode === '__label__' ? k : k.split(':').slice(1).join(':');
    return `<div class="li"><div class="ld" style="background:${colorMap[k]}"></div>${esc(label)}</div>`;
  }).join('');
}

// ── Resizable split pane ───────────────────────────────────────────────────────
(() => {
  const handle = document.getElementById('drag-handle');
  const left   = document.getElementById('left');
  let dragging = false;
  handle.addEventListener('mousedown', e => {
    dragging = true;
    handle.classList.add('dragging');
    document.body.style.cursor     = 'col-resize';
    document.body.style.userSelect = 'none';
    e.preventDefault();
  });
  document.addEventListener('mousemove', e => {
    if (!dragging) return;
    const rect = document.getElementById('main').getBoundingClientRect();
    const pct  = ((e.clientX - rect.left) / rect.width) * 100;
    left.style.width = Math.max(20, Math.min(78, pct)) + '%';
    if (cy) cy.resize();
  });
  document.addEventListener('mouseup', () => {
    if (!dragging) return;
    dragging = false;
    handle.classList.remove('dragging');
    document.body.style.cursor     = '';
    document.body.style.userSelect = '';
    if (cy) cy.fit(undefined, 28);
  });
})();

// ── Keyboard shortcuts ─────────────────────────────────────────────────────────
document.addEventListener('keydown', e => {
  const inEditor = document.activeElement === document.getElementById('gql');
  if ((e.ctrlKey || e.metaKey) && e.key === 'Enter') {
    e.preventDefault();
    if (e.shiftKey) vizQuery(); else runQuery();
  }
  if ((e.key === 'Delete' || e.key === 'Backspace') && !inEditor && cy && cy.$(':selected').length) {
    cy.$(':selected').remove();
    updateColors();
    updateGraphStats();
  }
});

// ── Saved Views ────────────────────────────────────────────────────────────────

// Wrap a value in a single-quoted GQL string literal.
// The GQL grammar has no escape sequences, so we strip any single-quotes from
// user-provided strings.  Graph names and ULIDs never contain single-quotes.
function gqlQ(s) {
  return "'" + String(s).replace(/'/g, '') + "'";
}

function updateSaveViewBtn() {
  const btn = document.getElementById('saveViewBtn');
  if (btn) btn.disabled = !cy || !cy.nodes().length;
}

// Collect visible node and edge IDs.
// ULIDs are pure Crockford base32 (uppercase alphanumeric) — safe inside any
// GQL string literal with no nesting or escaping concerns.
function collectGraphIds() {
  return {
    nodeIds: cy.nodes().map(n => n.id()).join(','),
    edgeIds: cy.edges().map(e => e.id()).join(',')
  };
}

// Build an UNWIND query that returns all node and edge IDs as plain values.
// /api/viz's enrich() scans every ULID string in result rows and resolves each
// as a node or edge, so returning edge IDs as plain values is sufficient.
function graphIdsToQuery(nodeIds, edgeIds) {
  const all = [...nodeIds.split(','), ...edgeIds.split(',')].filter(Boolean);
  if (!all.length) return null;
  const items = all.map(id => `'${id}'`).join(',');
  return `UNWIND [${items}] AS elem RETURN elem`;
}

async function saveView() {
  if (!cy || !cy.nodes().length) return;
  const name = prompt('View name:');
  if (!name || !name.trim()) return;
  const cleanName = name.trim();
  const { nodeIds, edgeIds } = collectGraphIds();
  const created = new Date().toISOString().slice(0, 10);
  // gqlQ() wraps values in single quotes and strips any stray single-quotes.
  // node_ids / edge_ids store ULIDs (alphanumeric+hyphen) — never contain single-quotes.
  const gql = `INSERT (:SavedView {name: ${gqlQ(cleanName)}, graph: ${gqlQ(currentGraph)}, node_ids: ${gqlQ(nodeIds)}, edge_ids: ${gqlQ(edgeIds)}, created: ${gqlQ(created)}})`;
  const r = await api('/api/query', {
    method: 'POST',
    body: JSON.stringify({ graph: '_meta', query: gql })
  });
  if (r && r.error) { alert('Save failed: ' + r.error); return; }
  setStatus('View saved: ' + cleanName);
}

async function openViewsModal() {
  const gql = `MATCH (v:SavedView) WHERE v.graph = ${gqlQ(currentGraph)} RETURN v.name, v.node_ids, v.edge_ids, v.created ORDER BY v.created`;
  const r = await api('/api/query', {
    method: 'POST',
    body: JSON.stringify({ graph: '_meta', query: gql })
  });
  const list = document.getElementById('views-list');
  if (!r || r.error || !r.rows || !r.rows.length) {
    list.innerHTML = '<div style="color:#484f58;font-size:12px;padding:8px 0">No saved views for this graph.</div>';
  } else {
    // Use data-* attributes so arbitrary view names / ID strings are never
    // eval'd as JS inside an onclick="…" attribute (JSON.stringify produces double-
    // quoted strings that break the attribute boundary).
    list.innerHTML = r.rows.map(row => {
      const vname    = row['v.name']     || '';
      const vnodeIds = row['v.node_ids'] || '';
      const vedgeIds = row['v.edge_ids'] || '';
      const vcreated = row['v.created']  || '';
      return `<div class="view-row">` +
        `<span class="view-name" data-nodeids="${esc(vnodeIds)}" data-edgeids="${esc(vedgeIds)}" title="Load view">${esc(vname)}</span>` +
        `<span class="view-date">${esc(vcreated)}</span>` +
        `<button class="view-del" data-name="${esc(vname)}" title="Delete view">✕</button>` +
        `</div>`;
    }).join('');
    // Attach handlers after the DOM is in place — dataset API decodes HTML entities.
    list.querySelectorAll('.view-name').forEach(el =>
      el.addEventListener('click', () => loadView(el.dataset.nodeids, el.dataset.edgeids)));
    list.querySelectorAll('.view-del').forEach(el =>
      el.addEventListener('click', () => deleteView(el.dataset.name)));
  }
  document.getElementById('views-modal').classList.add('show');
}

function closeViewsModal() {
  document.getElementById('views-modal').classList.remove('show');
}

function loadView(nodeIds, edgeIds) {
  const query = graphIdsToQuery(nodeIds || '', edgeIds || '');
  if (!query) return;
  closeViewsModal();
  document.getElementById('gql').value = query;
  vizQuery();
}

async function deleteView(name) {
  const ok = await customConfirm(`Delete view "${name}"?`);
  if (!ok) return;
  const gql = `MATCH (v:SavedView) WHERE v.name = ${gqlQ(name)} AND v.graph = ${gqlQ(currentGraph)} DELETE v`;
  const r = await api('/api/query', {
    method: 'POST',
    body: JSON.stringify({ graph: '_meta', query: gql })
  });
  if (r && r.error) { alert('Delete failed: ' + r.error); return; }
  await openViewsModal();
}

// Close views modal when clicking the backdrop.
document.getElementById('views-modal').addEventListener('click', e => {
  if (e.target === document.getElementById('views-modal')) closeViewsModal();
});

init();
</script>
</body></html>