// 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_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 RemoveThisExpression extends ResolvedCorrectionProducer {
  new({required super.context});

  @override
  CorrectionApplicability get applicability =>
      CorrectionApplicability.automatically;

  @override
  FixKind get fixKind => DartFixKind.removeThisExpression;

  @override
  FixKind get multiFixKind => DartFixKind.removeThisExpressionMulti;

  @override
  Future<void> compute(ChangeBuilder builder) async {
    var node = this.node;
    if (node is ConstructorFieldInitializer) {
      var thisKeyword = node.thisKeyword;
      if (thisKeyword != null) {
        await builder.addDartFileEdit(file, (builder) {
          builder.addDeletion(range.startStart(thisKeyword, node.fieldName));
        });
      }
    } else {
      var parent = node.parent;
      if (parent is PropertyAccess && parent.target is ThisExpression) {
        await builder.addDartFileEdit(file, (builder) {
          builder.addDeletion(range.startEnd(parent, parent.operator));
        });
      } else if (parent is MethodInvocation) {
        var operator = parent.operator;
        if (parent.target is ThisExpression && operator != null) {
          await builder.addDartFileEdit(file, (builder) {
            builder.addDeletion(range.startEnd(parent, operator));
          });
        }
      }
    }
  }
}
