/* -*- 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 "DetailsFrame.h"

#include "mozilla/Attributes.h"
#include "mozilla/PresShell.h"
#include "mozilla/dom/HTMLDetailsElement.h"
#include "mozilla/dom/HTMLSummaryElement.h"
#include "nsContentUtils.h"
#include "nsPlaceholderFrame.h"
#include "nsTextNode.h"

using namespace mozilla;
using namespace mozilla::dom;

NS_IMPL_FRAMEARENA_HELPERS(DetailsFrame)

NS_QUERYFRAME_HEAD(DetailsFrame)
  NS_QUERYFRAME_ENTRY(DetailsFrame)
  NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator)
NS_QUERYFRAME_TAIL_INHERITING(nsBlockFrame)

nsBlockFrame* NS_NewDetailsFrame(PresShell* aPresShell, ComputedStyle* aStyle) {
  return new (aPresShell) DetailsFrame(aStyle, aPresShell->GetPresContext());
}

namespace mozilla {

DetailsFrame::DetailsFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
    : nsBlockFrame(aStyle, aPresContext, kClassID) {}

DetailsFrame::~DetailsFrame() = default;

void DetailsFrame::SetInitialChildList(ChildListID aListID,
                                       nsFrameList& aChildList) {
#ifdef DEBUG
  if (aListID == kPrincipalList) {
    CheckValidMainSummary(aChildList);
  }
#endif

  nsBlockFrame::SetInitialChildList(aListID, aChildList);
}

#ifdef DEBUG
bool DetailsFrame::CheckValidMainSummary(const nsFrameList& aFrameList) const {
  for (nsIFrame* child : aFrameList) {
    if (child->IsGeneratedContentFrame()) {
      continue;
    }
    HTMLSummaryElement* summary =
        HTMLSummaryElement::FromNode(child->GetContent());
    if (child == aFrameList.FirstChild()) {
      if (summary && summary->IsMainSummary()) {
        return true;
      } else if (child->GetContent() == GetContent()) {
        // The child frame's content is the same as our content, which means
        // it's a kind of wrapper frame. Descend into its child list to find
        // main summary.
        if (CheckValidMainSummary(child->PrincipalChildList())) {
          return true;
        }
      }
    } else {
      NS_ASSERTION(!summary || !summary->IsMainSummary(),
                   "Rest of the children are either not summary element "
                   "or are not the main summary!");
    }
  }
  return false;
}
#endif

void DetailsFrame::DestroyFrom(nsIFrame* aDestructRoot,
                               PostDestroyData& aPostDestroyData) {
  aPostDestroyData.AddAnonymousContent(mDefaultSummary.forget());
  nsBlockFrame::DestroyFrom(aDestructRoot, aPostDestroyData);
}

nsresult DetailsFrame::CreateAnonymousContent(
    nsTArray<ContentInfo>& aElements) {
  auto* details = HTMLDetailsElement::FromNode(GetContent());
  if (details->GetFirstSummary()) {
    return NS_OK;
  }

  // The <details> element lacks any direct <summary> child. Create a default
  // <summary> element as an anonymous content.
  nsNodeInfoManager* nodeInfoManager =
      GetContent()->NodeInfo()->NodeInfoManager();

  RefPtr<NodeInfo> nodeInfo = nodeInfoManager->GetNodeInfo(
      nsGkAtoms::summary, nullptr, kNameSpaceID_XHTML, nsINode::ELEMENT_NODE);
  mDefaultSummary = new (nodeInfoManager) HTMLSummaryElement(nodeInfo.forget());

  nsAutoString defaultSummaryText;
  nsContentUtils::GetMaybeLocalizedString(
      nsContentUtils::eFORMS_PROPERTIES, "DefaultSummary",
      GetContent()->OwnerDoc(), defaultSummaryText);
  RefPtr<nsTextNode> description =
      new (nodeInfoManager) nsTextNode(nodeInfoManager);
  description->SetText(defaultSummaryText, false);
  mDefaultSummary->AppendChildTo(description, false);

  aElements.AppendElement(mDefaultSummary);

  return NS_OK;
}

void DetailsFrame::AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
                                            uint32_t aFilter) {
  if (mDefaultSummary) {
    aElements.AppendElement(mDefaultSummary);
  }
}

bool DetailsFrame::HasMainSummaryFrame(nsIFrame* aSummaryFrame) {
  const ChildListIDs flowLists = {kPrincipalList, kOverflowList};
  for (nsIFrame* frag = this; frag; frag = frag->GetNextInFlow()) {
    for (const auto& [list, listID] : frag->ChildLists()) {
      if (!flowLists.contains(listID)) {
        continue;
      }
      for (nsIFrame* child : list) {
        child = nsPlaceholderFrame::GetRealFrameFor(child);
        // We skip any non-primary frames such as a list-style-position:inside
        // bullet frame for the <details> itself.
        if (!child->IsGeneratedContentFrame()) {
          return aSummaryFrame == child;
        }
      }
    }
  }
  return false;
}

}  // namespace mozilla