71 lines
2.2 KiB
Dart
71 lines
2.2 KiB
Dart
import 'dart:collection';
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import 'package:flutter_riverpod/flutter_riverpod.dart';
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import 'package:sharedinbox/core/models/undo_action.dart';
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import 'package:sharedinbox/di.dart';
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class UndoService extends StateNotifier<UndoAction?> {
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UndoService(this._ref) : super(null);
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final Ref _ref;
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final ListQueue<UndoAction> _history = ListQueue<UndoAction>();
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static const int _maxHistory = 10;
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void pushAction(UndoAction action) {
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_history.addLast(action);
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if (_history.length > _maxHistory) {
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_history.removeFirst();
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}
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state = action;
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}
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void clear() {
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_history.clear();
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state = null;
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}
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Future<void> undo() async {
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if (_history.isEmpty) return;
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final action = _history.removeLast();
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// Update state to the new last action or null
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state = _history.isNotEmpty ? _history.last : null;
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final repo = _ref.read(emailRepositoryProvider);
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for (final id in action.emailIds) {
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// 1. Try to cancel the original change (if not started yet).
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final cancelled = await repo.cancelPendingChange(id, 'delete') ||
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await repo.cancelPendingChange(id, 'move');
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try {
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final original = action.originalEmails.isEmpty
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? null
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: action.originalEmails.where((e) => e.id == id).firstOrNull;
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// 2. If row is missing (hard delete), restore it first.
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// We restore it at its CURRENT state (where it is on the server,
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// or where it was moving to).
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if (original != null) {
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final currentPath = cancelled
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? action.sourceMailboxPath
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: (action.destinationMailboxPath ?? action.sourceMailboxPath);
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await repo.restoreEmails([original.copyWith(mailboxPath: currentPath)]);
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}
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// 3. Move it back to source.
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// This updates local DB optimistically and (if not cancelled) enqueues
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// a reverse move on the server.
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await repo.moveEmail(id, action.sourceMailboxPath);
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if (cancelled) {
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// 4. If we successfully cancelled the original, the reverse move
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// we just enqueued is redundant.
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await repo.cancelPendingChange(id, 'move');
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}
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} catch (e) {
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// Best effort.
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}
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}
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}
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}
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