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 'package:googleapis/firestore/v1.dart';

import 'firestore.dart';
import 'result.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) => getValue(change[fName])));
}

class RevertedChanges {
  final int index;
  final int revertIndex;
  final List<Map<String, Value> /*!*/ > changes;
  final Map<String /*!*/, List<Map<String, Value> /*!*/ >> changesForTest;

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

  bool approveRevert(Map<String, dynamic> revert) {
    final reverted = changesForTest[revert[fName]];
    return isFailure(revert) &&
        reverted != null &&
        reverted.any(
            (change) => revert[fResult] == getValue(change[fPreviousResult]));
  }
}