builder/lib/src/reverted_changes.dart

// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:collection/collection.dart';

import 'firestore.dart';

Future<RevertedChanges> getRevertedChanges(
  String reverted,
  int revertIndex,
  FirestoreService firestore,
) async {
  final revertedCommit = await firestore.getCommit(reverted);
  if (revertedCommit == null) {
    throw 'Cannot find commit for reverted commit hash $reverted';
  }
  final index = revertedCommit.index;
  final changes = await firestore.findRevertedChanges(index);
  return RevertedChanges(
    index,
    revertIndex,
    changes,
    groupBy(changes, (change) => change.name),
  );
}

class RevertedChanges {
  final int index;
  final int revertIndex;
  final List<ResultRecord> changes;
  final Map<String, List<ResultRecord>> changesForTest;

  RevertedChanges(
    this.index,
    this.revertIndex,
    this.changes,
    this.changesForTest,
  );

  bool approveRevert(ChangeRecord revert) {
    final reverted = changesForTest[revert.name];
    return revert.isFailure &&
        reverted != null &&
        reverted.any((change) => revert.result == change.previousResult);
  }
}