// 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/fix.dart';
import 'package:analysis_server_plugin/edit/dart/correction_producer.dart';
import 'package:analyzer/dart/ast/ast.dart';
import 'package:analyzer/src/utilities/extensions/flutter.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 ConvertFlutterChildren extends ResolvedCorrectionProducer {
  new({required super.context});

  @override
  CorrectionApplicability get applicability =>
      // TODO(applicability): comment on why.
      CorrectionApplicability.singleLocation;

  @override
  FixKind get fixKind => DartFixKind.convertFlutterChildren;

  @override
  Future<void> compute(ChangeBuilder builder) async {
    NamedArgument? namedArgument;
    if (node is NamedArgument) {
      namedArgument = node as NamedArgument;
    }
    if (namedArgument != null && namedArgument.name.lexeme == 'children') {
      var expression = namedArgument.argumentExpression;
      if (expression is ListLiteral && expression.elements.length == 1) {
        var widget = expression.elements[0];
        if (widget.isWidgetExpression) {
          var actualNamedArgument = namedArgument;
          var widgetText = utils.getNodeText(widget);
          var indentOld = utils.getLinePrefix(widget.offset);
          var indentNew = utils.getLinePrefix(namedArgument.offset);
          widgetText = utils.replaceSourceIndent(
            widgetText,
            indentOld,
            indentNew,
          );

          await builder.addDartFileEdit(file, (builder) {
            builder.addReplacement(range.node(actualNamedArgument), (builder) {
              builder.write('child: ');
              builder.write(widgetText);
            });
          });
        }
      }
    }
  }
}
