// Copyright (c) 2011, 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.

part of html;

Future<CSSStyleDeclaration> _emptyStyleFuture() {
  return _createMeasurementFuture(() => new Element.tag('div').style,
                                  new Completer<CSSStyleDeclaration>());
}

class _FrozenCssClassSet extends CssClassSet {
  void writeClasses(Set s) {
    throw new UnsupportedError(
        'frozen class set cannot be modified');
  }
  Set<String> readClasses() => new Set<String>();

  bool get frozen => true;
}

/// @domName $DOMNAME
class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
  factory $CLASSNAME() => _$(CLASSNAME)FactoryProvider.createDocumentFragment();

  factory $CLASSNAME.html(String html) =>
      _$(CLASSNAME)FactoryProvider.createDocumentFragment_html(html);

  factory $CLASSNAME.svg(String svgContent) =>
      _$(CLASSNAME)FactoryProvider.createDocumentFragment_svg(svgContent);

  List<Element> get elements => this.children;

  // TODO: The type of value should be Collection<Element>. See http://b/5392897
  void set elements(value) {
    this.children = value;
  }

$if DART2JS
  // Native field is used only by Dart code so does not lead to instantiation
  // of native classes
  @Creates('Null')
$endif
  List<Element> _children;

  List<Element> get children {
    if (_children == null) {
      _children = new FilteredElementList(this);
    }
    return _children;
  }

  void set children(Collection<Element> value) {
    // Copy list first since we don't want liveness during iteration.
    List copy = new List.from(value);
    var children = this.children;
    children.clear();
    children.addAll(copy);
  }

  Element query(String selectors) => $dom_querySelector(selectors);

  List<Element> queryAll(String selectors) =>
    new _FrozenElementList._wrap($dom_querySelectorAll(selectors));

  String get innerHtml {
    final e = new Element.tag("div");
    e.nodes.add(this.clone(true));
    return e.innerHtml;
  }

  String get outerHtml => innerHtml;

  // TODO(nweiz): Do we want to support some variant of innerHtml for XML and/or
  // SVG strings?
  void set innerHtml(String value) {
    this.nodes.clear();

    final e = new Element.tag("div");
    e.innerHtml = value;

    // Copy list first since we don't want liveness during iteration.
    List nodes = new List.from(e.nodes);
    this.nodes.addAll(nodes);
  }

  Node _insertAdjacentNode(String where, Node node) {
    switch (where.toLowerCase()) {
      case "beforebegin": return null;
      case "afterend": return null;
      case "afterbegin":
        var first = this.nodes.length > 0 ? this.nodes[0] : null;
        this.insertBefore(node, first);
        return node;
      case "beforeend":
        this.nodes.add(node);
        return node;
      default:
        throw new ArgumentError("Invalid position ${where}");
    }
  }

  Element insertAdjacentElement(String where, Element element)
    => this._insertAdjacentNode(where, element);

  void insertAdjacentText(String where, String text) {
    this._insertAdjacentNode(where, new Text(text));
  }

  void insertAdjacentHtml(String where, String text) {
    this._insertAdjacentNode(where, new DocumentFragment.html(text));
  }

  void append(Element element) {
    this.children.add(element);
  }

  void appendText(String text) {
    this.insertAdjacentText('beforeend', text);
  }

  void appendHtml(String text) {
    this.insertAdjacentHtml('beforeend', text);
  }

  // If we can come up with a semi-reasonable default value for an Element
  // getter, we'll use it. In general, these return the same values as an
  // element that has no parent.
  String get contentEditable => "false";
  bool get isContentEditable => false;
  bool get draggable => false;
  bool get hidden => false;
  bool get spellcheck => false;
  bool get translate => false;
  int get tabIndex => -1;
  String get id => "";
  String get title => "";
  String get tagName => "";
  String get webkitdropzone => "";
  String get webkitRegionOverflow => "";
  Element get $m_firstElementChild {
    if (elements.length > 0) {
      return elements[0];
    }
    return null;
  }
  Element get $m_lastElementChild => elements.last;
  Element get nextElementSibling => null;
  Element get previousElementSibling => null;
  Element get offsetParent => null;
  Element get parent => null;
  Map<String, String> get attributes => const {};
  CssClassSet get classes => new _FrozenCssClassSet();
  Map<String, String> get dataAttributes => const {};
  CSSStyleDeclaration get style => new Element.tag('div').style;
  Future<CSSStyleDeclaration> get computedStyle =>
      _emptyStyleFuture();
  Future<CSSStyleDeclaration> getComputedStyle(String pseudoElement) =>
      _emptyStyleFuture();
  bool matchesSelector(String selectors) => false;

  // Imperative Element methods are made into no-ops, as they are on parentless
  // elements.
  void blur() {}
  void focus() {}
  void click() {}
  void scrollByLines(int lines) {}
  void scrollByPages(int pages) {}
  void scrollIntoView([bool centerIfNeeded]) {}
  void webkitRequestFullScreen(int flags) {}
  void webkitRequestFullscreen() {}

  // Setters throw errors rather than being no-ops because we aren't going to
  // retain the values that were set, and erroring out seems clearer.
  void set attributes(Map<String, String> value) {
    throw new UnsupportedError(
      "Attributes can't be set for document fragments.");
  }

  void set classes(Collection<String> value) {
    throw new UnsupportedError(
      "Classes can't be set for document fragments.");
  }

  void set dataAttributes(Map<String, String> value) {
    throw new UnsupportedError(
      "Data attributes can't be set for document fragments.");
  }

  void set contentEditable(String value) {
    throw new UnsupportedError(
      "Content editable can't be set for document fragments.");
  }

  String get dir {
    throw new UnsupportedError(
      "Document fragments don't support text direction.");
  }

  void set dir(String value) {
    throw new UnsupportedError(
      "Document fragments don't support text direction.");
  }

  void set draggable(bool value) {
    throw new UnsupportedError(
      "Draggable can't be set for document fragments.");
  }

  void set hidden(bool value) {
    throw new UnsupportedError(
      "Hidden can't be set for document fragments.");
  }

  void set id(String value) {
    throw new UnsupportedError(
      "ID can't be set for document fragments.");
  }

  String get lang {
    throw new UnsupportedError(
      "Document fragments don't support language.");
  }

  void set lang(String value) {
    throw new UnsupportedError(
      "Document fragments don't support language.");
  }

  void set scrollLeft(int value) {
    throw new UnsupportedError(
      "Document fragments don't support scrolling.");
  }

  void set scrollTop(int value) {
    throw new UnsupportedError(
      "Document fragments don't support scrolling.");
  }

  void set spellcheck(bool value) {
     throw new UnsupportedError(
      "Spellcheck can't be set for document fragments.");
  }

  void set translate(bool value) {
     throw new UnsupportedError(
      "Spellcheck can't be set for document fragments.");
  }

  void set tabIndex(int value) {
    throw new UnsupportedError(
      "Tab index can't be set for document fragments.");
  }

  void set title(String value) {
    throw new UnsupportedError(
      "Title can't be set for document fragments.");
  }

  void set webkitdropzone(String value) {
    throw new UnsupportedError(
      "WebKit drop zone can't be set for document fragments.");
  }

  void set webkitRegionOverflow(String value) {
    throw new UnsupportedError(
      "WebKit region overflow can't be set for document fragments.");
  }

$!MEMBERS
}