// Copyright (c) 2015, 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.

/// This file contains a set of concrete classes representing an in-memory
/// semantic model of the IDL used to code generate summary serialization and
/// deserialization code.

/// Information about a single class defined in the IDL.
class ClassDeclaration extends Declaration {
  /// All fields defined in the class, including deprecated ones.
  final List<FieldDeclaration> allFields = <FieldDeclaration>[];

  /// Indicates whether the class has the `topLevel` annotation.
  final bool isTopLevel;

  /// If [isTopLevel] is `true` and a file identifier was specified for this
  /// class, the file identifier string.  Otherwise `null`.
  final String? fileIdentifier;

  /// Indicates whether the class has the `deprecated` annotation.
  final bool isDeprecated;

  ClassDeclaration({
    required String? documentation,
    required this.fileIdentifier,
    required String name,
    required this.isDeprecated,
    required this.isTopLevel,
  }) : super(documentation, name);

  /// Get the non-deprecated fields defined in the class.
  Iterable<FieldDeclaration> get fields =>
      allFields.where((FieldDeclaration field) => !field.isDeprecated);
}

/// Information about a declaration in the IDL.
class Declaration {
  /// The optional documentation, may be `null`.
  final String? documentation;

  /// The name of the declaration.
  final String name;

  Declaration(this.documentation, this.name);
}

/// Information about a single enum defined in the IDL.
class EnumDeclaration extends Declaration {
  /// List of enumerated values.
  final List<EnumValueDeclaration> values = <EnumValueDeclaration>[];

  EnumDeclaration(String? documentation, String name)
      : super(documentation, name);
}

/// Information about a single enum value defined in the IDL.
class EnumValueDeclaration extends Declaration {
  EnumValueDeclaration(String? documentation, String name)
      : super(documentation, name);
}

/// Information about a single class field defined in the IDL.
class FieldDeclaration extends Declaration {
  /// The file of the field.
  final FieldType type;

  /// The id of the field.
  final int id;

  /// Indicates whether the field is deprecated.
  final bool isDeprecated;

  /// Indicates whether the field is informative.
  final bool isInformative;

  FieldDeclaration({
    required String? documentation,
    required String name,
    required this.type,
    required this.id,
    required this.isDeprecated,
    required this.isInformative,
  }) : super(documentation, name);
}

/// Information about the type of a class field defined in the IDL.
class FieldType {
  /// Type of the field (e.g. 'int').
  final String typeName;

  /// Indicates whether this field contains a list of the type specified in
  /// [typeName].
  final bool isList;

  FieldType(this.typeName, this.isList);

  @override
  int get hashCode {
    var hash = 0x3fffffff & typeName.hashCode;
    hash = 0x3fffffff & (hash * 31 + (hash ^ isList.hashCode));
    return hash;
  }

  @override
  bool operator ==(Object other) {
    if (other is FieldType) {
      return other.typeName == typeName && other.isList == isList;
    }
    return false;
  }

  @override
  String toString() => isList ? 'List<$typeName>' : typeName;
}

/// Top level representation of the summary IDL.
class Idl {
  /// Classes defined in the IDL.
  final Map<String, ClassDeclaration> classes = <String, ClassDeclaration>{};

  /// Enums defined in the IDL.
  final Map<String, EnumDeclaration> enums = <String, EnumDeclaration>{};
}