// Copyright (c) 2019, 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/dart/ast/visitor.dart';
import 'package:analyzer/dart/element/scope.dart';
import 'package:analyzer/src/dart/ast/ast.dart';
import 'package:analyzer/src/dart/element/element.dart';
import 'package:analyzer/src/summary2/ast_resolver.dart';
import 'package:analyzer/src/summary2/library_builder.dart';
import 'package:analyzer/src/summary2/link.dart';
import 'package:analyzer/src/summary2/linking_node_scope.dart';

class MetadataResolver extends ThrowingAstVisitor<void> {
  final Linker _linker;
  final Scope _containerScope;
  final LibraryBuilder _libraryBuilder;
  final CompilationUnitElementImpl _unitElement;
  late Scope _scope;

  MetadataResolver(
    this._linker,
    this._unitElement,
    this._libraryBuilder,
  ) : _containerScope = _unitElement.scope {
    _scope = _containerScope;
  }

  @override
  void visitAnnotation(covariant AnnotationImpl node) {
    var annotationElement = node.elementAnnotation;
    if (annotationElement is ElementAnnotationImpl) {
      var analysisOptions = _libraryBuilder.kind.file.analysisOptions;
      var astResolver =
          AstResolver(_linker, _unitElement, _scope, analysisOptions);
      astResolver.resolveAnnotation(node);
      annotationElement.element2 = node.element2;
    }
  }

  @override
  void visitClassDeclaration(ClassDeclaration node) {
    node.metadata.accept(this);
    node.typeParameters?.accept(this);

    _scope = LinkingNodeContext.get(node).scope;
    try {
      node.members.accept(this);
    } finally {
      _scope = _containerScope;
    }
  }

  @override
  void visitClassTypeAlias(ClassTypeAlias node) {
    node.metadata.accept(this);
    node.typeParameters?.accept(this);
  }

  @override
  void visitCompilationUnit(CompilationUnit node) {
    node.directives.accept(this);
    node.declarations.accept(this);
  }

  @override
  void visitConstructorDeclaration(ConstructorDeclaration node) {
    node.metadata.accept(this);
    node.parameters.accept(this);
  }

  @override
  void visitDefaultFormalParameter(DefaultFormalParameter node) {
    node.parameter.accept(this);
  }

  @override
  void visitEnumConstantDeclaration(EnumConstantDeclaration node) {
    node.metadata.accept(this);
  }

  @override
  void visitEnumDeclaration(EnumDeclaration node) {
    node.metadata.accept(this);
    node.typeParameters?.accept(this);

    _scope = LinkingNodeContext.get(node).scope;
    try {
      node.constants.accept(this);
      node.members.accept(this);
    } finally {
      _scope = _containerScope;
    }
  }

  @override
  void visitExportDirective(covariant ExportDirectiveImpl node) {
    node.metadata.accept(this);
    // We might have already accessed metadata flags, e.g. `hasDeprecated`,
    // before we finished metadata resolution, during `PrefixScope` building.
    // So, these flags are not accurate anymore, and we need to reset them.
    node.element!.resetMetadataFlags();
  }

  @override
  void visitExtensionDeclaration(ExtensionDeclaration node) {
    node.metadata.accept(this);
    node.typeParameters?.accept(this);

    _scope = LinkingNodeContext.get(node).scope;
    try {
      node.members.accept(this);
    } finally {
      _scope = _containerScope;
    }
  }

  @override
  void visitExtensionTypeDeclaration(ExtensionTypeDeclaration node) {
    node.metadata.accept(this);
    node.typeParameters?.accept(this);
    node.representation.accept(this);

    _scope = LinkingNodeContext.get(node).scope;
    try {
      node.members.accept(this);
    } finally {
      _scope = _containerScope;
    }
  }

  @override
  void visitFieldDeclaration(FieldDeclaration node) {
    node.metadata.accept(this);
  }

  @override
  void visitFieldFormalParameter(FieldFormalParameter node) {
    node.metadata.accept(this);
    node.parameters?.accept(this);
  }

  @override
  void visitFormalParameterList(FormalParameterList node) {
    node.parameters.accept(this);
  }

  @override
  void visitFunctionDeclaration(FunctionDeclaration node) {
    node.metadata.accept(this);
    node.functionExpression.accept(this);
  }

  @override
  void visitFunctionExpression(FunctionExpression node) {
    node.typeParameters?.accept(this);
    node.parameters?.accept(this);
  }

  @override
  void visitFunctionTypeAlias(FunctionTypeAlias node) {
    node.metadata.accept(this);
    node.typeParameters?.accept(this);
    node.parameters.accept(this);
  }

  @override
  void visitFunctionTypedFormalParameter(FunctionTypedFormalParameter node) {
    node.metadata.accept(this);
    node.typeParameters?.accept(this);
    node.parameters.accept(this);
  }

  @override
  void visitGenericFunctionType(GenericFunctionType node) {
    node.typeParameters?.accept(this);
    node.parameters.accept(this);
  }

  @override
  void visitGenericTypeAlias(GenericTypeAlias node) {
    node.metadata.accept(this);
    node.typeParameters?.accept(this);
    // TODO(eernst): Extend this visitor to visit types.
    // E.g., `List<Function<@m X>()> Function()` is not included now.
    var type = node.type;
    if (type is GenericFunctionType) type.accept(this);
  }

  @override
  void visitImportDirective(ImportDirective node) {
    node.metadata.accept(this);
  }

  @override
  void visitLibraryDirective(LibraryDirective node) {
    node.metadata.accept(this);
  }

  @override
  void visitMethodDeclaration(MethodDeclaration node) {
    node.metadata.accept(this);
    node.typeParameters?.accept(this);
    node.parameters?.accept(this);
  }

  @override
  void visitMixinDeclaration(MixinDeclaration node) {
    node.metadata.accept(this);
    node.typeParameters?.accept(this);

    _scope = LinkingNodeContext.get(node).scope;
    try {
      node.members.accept(this);
    } finally {
      _scope = _containerScope;
    }
  }

  @override
  void visitPartDirective(PartDirective node) {
    node.metadata.accept(this);
  }

  @override
  void visitPartOfDirective(PartOfDirective node) {
    node.metadata.accept(this);
  }

  @override
  void visitRepresentationDeclaration(RepresentationDeclaration node) {
    node.fieldMetadata.accept(this);
  }

  @override
  void visitSimpleFormalParameter(SimpleFormalParameter node) {
    node.metadata.accept(this);
  }

  @override
  void visitSuperFormalParameter(SuperFormalParameter node) {
    node.metadata.accept(this);
    node.parameters?.accept(this);
  }

  @override
  void visitTopLevelVariableDeclaration(TopLevelVariableDeclaration node) {
    node.metadata.accept(this);
  }

  @override
  void visitTypeParameter(TypeParameter node) {
    node.metadata.accept(this);
  }

  @override
  void visitTypeParameterList(TypeParameterList node) {
    node.typeParameters.accept(this);
  }
}