// Copyright (c) 2024, 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/fix.dart';
import 'package:analysis_server_plugin/edit/dart/correction_producer.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 RemoveExtendsClause extends ResolvedCorrectionProducer {
  new({required super.context});

  @override
  CorrectionApplicability get applicability =>
      CorrectionApplicability.automatically;

  @override
  FixKind get fixKind => DartFixKind.removeExtendsClause;

  @override
  FixKind get multiFixKind => DartFixKind.removeExtendsClauseMulti;

  @override
  Future<void> compute(ChangeBuilder builder) async {
    var classDeclaration = node.thisOrAncestorOfType<ClassDeclaration>();
    if (classDeclaration == null) return;

    var extendsClause = classDeclaration.extendsClause;
    if (extendsClause == null) return;

    await builder.addDartFileEdit(file, (builder) {
      switch (classDeclaration.body) {
        case BlockClassBody body:
          // Delete the keyword `extends`, through `{`.
          builder.addDeletion(
            range.startStart(extendsClause, body.leftBracket),
          );
        case EmptyClassBody body:
          // Delete the whitespace before `extends`, through `;`.
          builder.addDeletion(
            range.endStart(extendsClause.beginToken.previous!, body.semicolon),
          );
      }
    });
  }
}
