// 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';

class CreateNoSuchMethod extends CorrectionProducer {
  @override
  FixKind get fixKind => DartFixKind.CREATE_NO_SUCH_METHOD;

  @override
  Future<void> compute(ChangeBuilder builder) async {
    if (node.parent is! ClassDeclaration) {
      return;
    }
    var targetClass = node.parent as ClassDeclaration;
    // prepare environment
    var prefix = utils.getIndent(1);
    var insertOffset = targetClass.end - 1;
    await builder.addDartFileEdit(file, (builder) {
      builder.addInsertion(insertOffset, (builder) {
        builder.selectHere();
        // insert empty line before existing member
        if (targetClass.members.isNotEmpty) {
          builder.write(eol);
        }
        // append method
        builder.write(prefix);
        builder.write('@override');
        builder.write(eol);
        builder.write(prefix);
        builder.write(
            'noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);');
        builder.write(eol);
      });
    });
  }

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