/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/EventDispatcher.h"
#include "mozilla/Maybe.h"
#include "mozilla/dom/HTMLOptGroupElement.h"
#include "mozilla/dom/HTMLOptGroupElementBinding.h"
#include "mozilla/dom/HTMLSelectElement.h"  // SafeOptionListMutation
#include "nsGkAtoms.h"
#include "nsStyleConsts.h"
#include "nsIFrame.h"
#include "nsIFormControlFrame.h"

NS_IMPL_NS_NEW_HTML_ELEMENT(OptGroup)

namespace mozilla::dom {

/**
 * The implementation of <optgroup>
 */

HTMLOptGroupElement::HTMLOptGroupElement(
    already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
    : nsGenericHTMLElement(std::move(aNodeInfo)) {
  // We start off enabled
  AddStatesSilently(ElementState::ENABLED);
}

HTMLOptGroupElement::~HTMLOptGroupElement() = default;

NS_IMPL_ELEMENT_CLONE(HTMLOptGroupElement)

void HTMLOptGroupElement::GetEventTargetParent(EventChainPreVisitor& aVisitor) {
  aVisitor.mCanHandle = false;

  if (nsIFrame* frame = GetPrimaryFrame()) {
    // FIXME(emilio): This poking at the style of the frame is broken unless we
    // flush before every event handling, which we don't really want to.
    if (frame->StyleUI()->UserInput() == StyleUserInput::None) {
      return;
    }
  }

  nsGenericHTMLElement::GetEventTargetParent(aVisitor);
}

Element* HTMLOptGroupElement::GetSelect() {
  Element* parent = nsINode::GetParentElement();
  if (!parent || !parent->IsHTMLElement(nsGkAtoms::select)) {
    return nullptr;
  }
  return parent;
}

void HTMLOptGroupElement::InsertChildBefore(nsIContent* aKid,
                                            nsIContent* aBeforeThis,
                                            bool aNotify, ErrorResult& aRv) {
  const uint32_t index =
      aBeforeThis ? *ComputeIndexOf(aBeforeThis) : GetChildCount();
  SafeOptionListMutation safeMutation(GetSelect(), this, aKid, index, aNotify);
  nsGenericHTMLElement::InsertChildBefore(aKid, aBeforeThis, aNotify, aRv);
  if (aRv.Failed()) {
    safeMutation.MutationFailed();
  }
}

void HTMLOptGroupElement::RemoveChildNode(nsIContent* aKid, bool aNotify) {
  SafeOptionListMutation safeMutation(GetSelect(), this, nullptr,
                                      *ComputeIndexOf(aKid), aNotify);
  nsGenericHTMLElement::RemoveChildNode(aKid, aNotify);
}

void HTMLOptGroupElement::AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName,
                                       const nsAttrValue* aValue,
                                       const nsAttrValue* aOldValue,
                                       nsIPrincipal* aSubjectPrincipal,
                                       bool aNotify) {
  if (aNameSpaceID == kNameSpaceID_None && aName == nsGkAtoms::disabled) {
    ElementState disabledStates;
    if (aValue) {
      disabledStates |= ElementState::DISABLED;
    } else {
      disabledStates |= ElementState::ENABLED;
    }

    ElementState oldDisabledStates = State() & ElementState::DISABLED_STATES;
    ElementState changedStates = disabledStates ^ oldDisabledStates;

    if (!changedStates.IsEmpty()) {
      ToggleStates(changedStates, aNotify);

      // All our children <option> have their :disabled state depending on our
      // disabled attribute. We should make sure their state is updated.
      for (nsIContent* child = nsINode::GetFirstChild(); child;
           child = child->GetNextSibling()) {
        if (auto optElement = HTMLOptionElement::FromNode(child)) {
          optElement->OptGroupDisabledChanged(true);
        }
      }
    }
  }

  return nsGenericHTMLElement::AfterSetAttr(
      aNameSpaceID, aName, aValue, aOldValue, aSubjectPrincipal, aNotify);
}

JSObject* HTMLOptGroupElement::WrapNode(JSContext* aCx,
                                        JS::Handle<JSObject*> aGivenProto) {
  return HTMLOptGroupElement_Binding::Wrap(aCx, this, aGivenProto);
}

}  // namespace mozilla::dom