// 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:analysis_server/src/services/correction/dart/abstract_producer.dart';
import 'package:analysis_server/src/services/correction/fix.dart';
import 'package:analyzer/dart/ast/ast.dart';
import 'package:analyzer_plugin/utilities/change_builder/change_builder_core.dart';
import 'package:analyzer_plugin/utilities/fixes/fixes.dart';
import 'package:analyzer_plugin/utilities/range_factory.dart';

class UseConst extends CorrectionProducer {
  @override
  FixKind get fixKind => DartFixKind.USE_CONST;

  @override
  Future<void> compute(ChangeBuilder builder) async {
    if (coveredNode is InstanceCreationExpression) {
      var instanceCreation = coveredNode as InstanceCreationExpression;
      await builder.addDartFileEdit(file, (builder) {
        var keyword = instanceCreation.keyword;
        if (keyword == null) {
          builder.addSimpleInsertion(
              instanceCreation.constructorName.offset, 'const');
        } else {
          builder.addSimpleReplacement(range.token(keyword), 'const');
        }
      });
    }
  }

  /// Return an instance of this class. Used as a tear-off in `FixProcessor`.
  static UseConst newInstance() => UseConst();
}