// 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.

// TODO(jcollins-g): Consider Enum as subclass of Container?
import 'package:analyzer/dart/element/element.dart';
import 'package:dartdoc/src/model/model.dart';

class Enum extends Class {
  Enum(ClassElement element, Library library, PackageGraph packageGraph)
      : super(element, library, packageGraph);

  List<EnumField> _instanceProperties;

  @override
  List<EnumField> get instanceProperties {
    if (_instanceProperties == null) {
      _instanceProperties = super
          .instanceProperties
          .map((Field p) => ModelElement.from(
              p.element, p.library, p.packageGraph,
              getter: p.getter, setter: p.setter) as EnumField)
          .toList(growable: false);
    }
    return _instanceProperties;
  }

  @override
  String get kind => 'enum';
}

/// Enum's fields are virtual, so we do a little work to create
/// usable values for the docs.
class EnumField extends Field {
  int _index;

  EnumField(FieldElement element, Library library, PackageGraph packageGraph,
      Accessor getter, Accessor setter)
      : super(element, library, packageGraph, getter, setter);

  EnumField.forConstant(this._index, FieldElement element, Library library,
      PackageGraph packageGraph, Accessor getter)
      : super(element, library, packageGraph, getter, null);

  @override
  String get constantValueBase {
    if (name == 'values') {
      return 'const List&lt;<wbr><span class="type-parameter">${field.enclosingElement.name}</span>&gt;';
    } else {
      return 'const ${field.enclosingElement.name}($_index)';
    }
  }

  @override
  List<ModelElement> get documentationFrom {
    if (name == 'values' || name == 'index') return [this];
    return super.documentationFrom;
  }

  @override
  String get documentation {
    if (name == 'values') {
      return 'A constant List of the values in this enum, in order of their declaration.';
    } else if (name == 'index') {
      return 'The integer index of this enum.';
    } else {
      return super.documentation;
    }
  }

  @override
  String get href {
    if (!identical(canonicalModelElement, this)) {
      return canonicalModelElement?.href;
    }
    assert(!(canonicalLibrary == null || canonicalEnclosingContainer == null));
    assert(canonicalLibrary == library);
    assert(canonicalEnclosingContainer == enclosingElement);
    return '${package.baseHref}${enclosingElement.library.dirName}/${(enclosingElement as Class).fileName}';
  }

  @override
  String get linkedName => name;

  @override
  bool get isCanonical {
    if (name == 'index') return false;
    // If this is something inherited from Object, e.g. hashCode, let the
    // normal rules apply.
    if (_index == null) {
      return super.isCanonical;
    }
    // TODO(jcollins-g): We don't actually document this as a separate entity;
    //                   do that or change this to false and deal with the
    //                   consequences.
    return true;
  }

  @override
  String get oneLineDoc => documentationAsHtml;

  @override
  Inheritable get overriddenElement => null;
}