// 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 RemoveEmptyCatch extends CorrectionProducer {
  @override
  bool get canBeAppliedInBulk => true;

  @override
  bool get canBeAppliedToFile => true;

  @override
  FixKind get fixKind => DartFixKind.REMOVE_EMPTY_CATCH;

  @override
  FixKind get multiFixKind => DartFixKind.REMOVE_EMPTY_CATCH_MULTI;

  @override
  Future<void> compute(ChangeBuilder builder) async {
    if (node.parent is! CatchClause) {
      return;
    }
    var catchClause = node.parent as CatchClause;

    if (catchClause.parent is! TryStatement) {
      return;
    }
    var tryStatement = catchClause.parent as TryStatement;
    if (tryStatement.catchClauses.length == 1 &&
        tryStatement.finallyBlock == null) {
      return;
    }

    await builder.addDartFileEdit(file, (builder) {
      builder.addDeletion(utils.getLinesRange(range.node(catchClause)));
    });
  }

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