// 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:_fe_analyzer_shared/src/scanner/token.dart';
import 'package:analysis_server/src/services/correction/assist.dart';
import 'package:analysis_server/src/services/correction/dart/abstract_producer.dart';
import 'package:analyzer/dart/ast/ast.dart';
import 'package:analyzer_plugin/utilities/assist/assist.dart';
import 'package:analyzer_plugin/utilities/change_builder/change_builder_core.dart';
import 'package:analyzer_plugin/utilities/range_factory.dart';

class ConvertDocumentationIntoBlock extends CorrectionProducer {
  @override
  AssistKind get assistKind => DartAssistKind.CONVERT_DOCUMENTATION_INTO_BLOCK;

  @override
  Future<void> compute(ChangeBuilder builder) async {
    var comment = node.thisOrAncestorOfType<Comment>();
    if (comment == null || !comment.isDocumentation) {
      return;
    }
    var tokens = comment.tokens;
    if (tokens.isEmpty ||
        tokens.any((Token token) =>
            token is! DocumentationCommentToken ||
            token.type != TokenType.SINGLE_LINE_COMMENT)) {
      return;
    }
    var prefix = utils.getNodePrefix(comment);

    await builder.addDartFileEdit(file, (builder) {
      builder.addReplacement(range.node(comment), (builder) {
        builder.writeln('/**');
        for (var token in comment.tokens) {
          builder.write(prefix);
          builder.write(' *');
          builder.writeln(token.lexeme.substring('///'.length));
        }
        builder.write(prefix);
        builder.write(' */');
      });
    });
  }

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