// 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:analyzer/analysis_rule/rule_context.dart';
import 'package:analyzer/analysis_rule/rule_visitor_registry.dart';
import 'package:analyzer/dart/analysis/features.dart';
import 'package:analyzer/dart/ast/ast.dart';
import 'package:analyzer/dart/ast/visitor.dart';
import 'package:analyzer/error/error.dart';

import '../analyzer.dart';

const _desc = r"Don't have a library name in a `library` declaration.";

class UnnecessaryLibraryName extends LintRule {
  UnnecessaryLibraryName()
    : super(name: LintNames.unnecessary_library_name, description: _desc);

  @override
  DiagnosticCode get diagnosticCode => LinterLintCode.unnecessaryLibraryName;

  @override
  void registerNodeProcessors(
    RuleVisitorRegistry registry,
    RuleContext context,
  ) {
    if (!context.isFeatureEnabled(Feature.unnamedLibraries)) return;

    var visitor = _Visitor(this);
    registry.addLibraryDirective(this, visitor);
  }
}

class _Visitor extends SimpleAstVisitor<void> {
  final LintRule rule;

  _Visitor(this.rule);

  @override
  void visitLibraryDirective(LibraryDirective node) {
    var name = node.name;
    if (name != null) {
      rule.reportAtNode(name);
    }
  }
}