add ability for non admins to add new traction, pending approval. Various QoL updates

lib/components/pages/loco_timeline.dart

@@ -5,6 +5,7 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
 import 'package:intl/intl.dart';
 import 'package:mileograph_flutter/objects/objects.dart';
+import 'package:mileograph_flutter/services/authservice.dart';
 import 'package:mileograph_flutter/services/data_service.dart';
 import 'package:provider/provider.dart';
 
@@ -29,6 +30,7 @@ class _LocoTimelinePageState extends State<LocoTimelinePage> {
   final List<_EventDraft> _draftEvents = [];
   bool _isSaving = false;
   bool _isDeleting = false;
+  bool _isModerating = false;
 
   @override
   void initState() {
@@ -59,8 +61,12 @@ class _LocoTimelinePageState extends State<LocoTimelinePage> {
 
   Future<void> _load() {
     final data = context.read<DataService>();
+    final auth = context.read<AuthService>();
     data.fetchEventFields();
-    return data.fetchLocoTimeline(widget.locoId);
+    return data.fetchLocoTimeline(
+      widget.locoId,
+      includeAllPending: auth.isElevated,
+    );
   }
 
   void _addDraftEvent() {
@@ -151,8 +157,18 @@ class _LocoTimelinePageState extends State<LocoTimelinePage> {
 
   Future<void> _deleteEntry(LocoAttrVersion entry) async {
     if (_isDeleting) return;
+    final isPending = entry.isPending;
     final blockId = entry.versionId;
-    if (blockId == null) {
+    final pendingEventId = entry.sourceEventId;
+    if (isPending && pendingEventId == null) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(
+          content: Text('Cannot delete: pending timeline block has no event ID.'),
+        ),
+      );
+      return;
+    }
+    if (!isPending && blockId == null) {
       ScaffoldMessenger.of(context).showSnackBar(
         const SnackBar(content: Text('Cannot delete: timeline block has no ID.')),
       );
@@ -193,13 +209,23 @@ class _LocoTimelinePageState extends State<LocoTimelinePage> {
       _isDeleting = true;
     });
     try {
-      await data.deleteTimelineBlock(
-        blockId: blockId,
-      );
+      if (isPending && pendingEventId != null) {
+        await data.deletePendingEvent(eventId: pendingEventId);
+      } else if (blockId != null) {
+        await data.deleteTimelineBlock(
+          blockId: blockId,
+        );
+      }
       await _load();
       if (mounted) {
         messenger.showSnackBar(
-          const SnackBar(content: Text('Timeline block deleted')),
+          SnackBar(
+            content: Text(
+              isPending
+                  ? 'Pending timeline block deleted'
+                  : 'Timeline block deleted',
+            ),
+          ),
         );
       }
     } catch (e) {
@@ -217,6 +243,79 @@ class _LocoTimelinePageState extends State<LocoTimelinePage> {
     }
   }
 
+  Future<void> _moderatePendingEntry(
+    LocoAttrVersion entry,
+    _PendingModerationAction action,
+  ) async {
+    if (_isModerating) return;
+    final eventId = entry.sourceEventId;
+    if (eventId == null) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(
+          content: Text('Cannot moderate: pending timeline block has no event ID.'),
+        ),
+      );
+      return;
+    }
+    final data = context.read<DataService>();
+    final approve = action == _PendingModerationAction.approve;
+    final messenger = ScaffoldMessenger.of(context);
+    final verb = approve ? 'approve' : 'reject';
+    final ok = await showDialog<bool>(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: Text('${approve ? 'Approve' : 'Reject'} pending event?'),
+        content: Text(
+          'Are you sure you want to $verb this pending timeline block?',
+        ),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.of(context).pop(false),
+            child: const Text('Cancel'),
+          ),
+          FilledButton(
+            onPressed: () => Navigator.of(context).pop(true),
+            child: Text(approve ? 'Approve' : 'Reject'),
+          ),
+        ],
+      ),
+    );
+    if (ok != true || !mounted) return;
+
+    setState(() {
+      _isModerating = true;
+    });
+    try {
+      if (approve) {
+        await data.approvePendingEvent(eventId: eventId);
+      } else {
+        await data.rejectPendingEvent(eventId: eventId);
+      }
+      await _load();
+      if (mounted) {
+        messenger.showSnackBar(
+          SnackBar(
+            content: Text(
+              'Pending timeline block ${approve ? 'approved' : 'rejected'}.',
+            ),
+          ),
+        );
+      }
+    } catch (e) {
+      if (mounted) {
+        messenger.showSnackBar(
+          SnackBar(content: Text('Failed to $verb pending timeline block: $e')),
+        );
+      }
+    } finally {
+      if (mounted) {
+        setState(() {
+          _isModerating = false;
+        });
+      }
+    }
+  }
+
   void _removeDraftAt(int index) {
     if (index < 0 || index >= _draftEvents.length) return;
     final draft = _draftEvents.removeAt(index);
@@ -248,6 +347,9 @@ class _LocoTimelinePageState extends State<LocoTimelinePage> {
       _isSaving = true;
     });
     try {
+      final existingPending =
+          await data.fetchUserPendingEvents(widget.locoId);
+      final clearedEventIds = <int>{};
       final invalid = <String>[];
       for (final draft in _draftEvents) {
         final dateStr = draft.dateController.text.trim();
@@ -274,6 +376,13 @@ class _LocoTimelinePageState extends State<LocoTimelinePage> {
           invalid.add('Add at least one value');
           continue;
         }
+        await _clearDuplicatePending(
+          existingPending,
+          clearedEventIds,
+          values.keys,
+          dateStr,
+          data,
+        );
         await data.createLocoEvent(
           locoId: widget.locoId,
           eventDate: dateStr,
@@ -312,6 +421,42 @@ class _LocoTimelinePageState extends State<LocoTimelinePage> {
     }
   }
 
+  Future<void> _clearDuplicatePending(
+    List<LocoAttrVersion> existingPending,
+    Set<int> clearedEventIds,
+    Iterable<String> attrs,
+    String dateStr,
+    DataService data,
+  ) async {
+    final trimmedDate = dateStr.trim().toLowerCase();
+    final attrSet = attrs.map((e) => e.toLowerCase()).toSet();
+    for (final pending in existingPending) {
+      final attrMatch = attrSet.contains(pending.attrCode.toLowerCase());
+      if (!attrMatch) continue;
+      final matchesDate = _dateMatchesPending(trimmedDate, pending);
+      if (!matchesDate) continue;
+      final eventId = pending.sourceEventId;
+      if (eventId == null || clearedEventIds.contains(eventId)) continue;
+      await data.deletePendingEvent(eventId: eventId);
+      clearedEventIds.add(eventId);
+    }
+  }
+
+  bool _dateMatchesPending(String draftDateLower, LocoAttrVersion pending) {
+    final masked = pending.maskedValidFrom?.trim().toLowerCase();
+    if (masked != null && masked.isNotEmpty && masked == draftDateLower) {
+      return true;
+    }
+    final draftDate = DateTime.tryParse(draftDateLower);
+    final pendingDate = pending.validFrom;
+    if (draftDate != null && pendingDate != null) {
+      return draftDate.year == pendingDate.year &&
+          draftDate.month == pendingDate.month &&
+          draftDate.day == pendingDate.day;
+    }
+    return false;
+  }
+
   bool _isValidDateString(String input) {
     final trimmed = input.trim();
     final regex = RegExp(r'^\d{4}-(\d{2}|xx|XX)-(\d{2}|xx|XX)$');
@@ -412,6 +557,8 @@ class _LocoTimelinePageState extends State<LocoTimelinePage> {
                     data.eventFields,
                   ),
                   onDeleteEntry: _deleteEntry,
+                  onModeratePending: _moderatePendingEntry,
+                  pendingActionsBusy: _isModerating,
                 ),
                 const SizedBox(height: 16),
                 _EventEditor(