/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "nsMenuGroupOwnerX.h"
#include "nsMenuBarX.h"
#include "nsMenuX.h"
#include "nsMenuItemX.h"
#include "nsMenuUtilsX.h"
#include "nsCocoaUtils.h"
#include "nsCocoaWindow.h"

#include "nsCOMPtr.h"
#include "nsString.h"
#include "nsObjCExceptions.h"
#include "nsThreadUtils.h"

#include "mozilla/dom/Element.h"
#include "nsIWidget.h"
#include "mozilla/dom/Document.h"

#include "nsINode.h"

using namespace mozilla;

NS_IMPL_ISUPPORTS(nsMenuGroupOwnerX, nsIMutationObserver)

nsMenuGroupOwnerX::nsMenuGroupOwnerX() : mCurrentCommandID(eCommand_ID_Last) {
  mInfoSet = [[NSMutableSet setWithCapacity:10] retain];
}

nsMenuGroupOwnerX::~nsMenuGroupOwnerX() {
  MOZ_ASSERT(mContentToObserverTable.Count() == 0, "have outstanding mutation observers!\n");

  // The MenuItemInfo objects in mInfoSet may live longer than we do.  So when
  // we get destroyed we need to invalidate all their mMenuGroupOwner pointers.
  NSEnumerator* counter = [mInfoSet objectEnumerator];
  MenuItemInfo* info;
  while ((info = (MenuItemInfo*)[counter nextObject])) {
    [info setMenuGroupOwner:nil];
  }
  [mInfoSet release];
}

nsresult nsMenuGroupOwnerX::Create(mozilla::dom::Element* aContent) {
  if (!aContent) return NS_ERROR_INVALID_ARG;

  mContent = aContent;

  return NS_OK;
}

//
// nsIMutationObserver
//

void nsMenuGroupOwnerX::CharacterDataWillChange(nsIContent* aContent,
                                                const CharacterDataChangeInfo&) {}

void nsMenuGroupOwnerX::CharacterDataChanged(nsIContent* aContent, const CharacterDataChangeInfo&) {
}

void nsMenuGroupOwnerX::ContentAppended(nsIContent* aFirstNewContent) {
  for (nsIContent* cur = aFirstNewContent; cur; cur = cur->GetNextSibling()) {
    ContentInserted(cur);
  }
}

void nsMenuGroupOwnerX::NodeWillBeDestroyed(const nsINode* aNode) {}

void nsMenuGroupOwnerX::AttributeWillChange(dom::Element* aContent, int32_t aNameSpaceID,
                                            nsAtom* aAttribute, int32_t aModType) {}

void nsMenuGroupOwnerX::NativeAnonymousChildListChange(nsIContent* aContent, bool aIsRemove) {}

void nsMenuGroupOwnerX::AttributeChanged(dom::Element* aElement, int32_t aNameSpaceID,
                                         nsAtom* aAttribute, int32_t aModType,
                                         const nsAttrValue* aOldValue) {
  nsCOMPtr<nsIMutationObserver> kungFuDeathGrip(this);
  nsChangeObserver* obs = LookupContentChangeObserver(aElement);
  if (obs) obs->ObserveAttributeChanged(aElement->OwnerDoc(), aElement, aAttribute);
}

void nsMenuGroupOwnerX::ContentRemoved(nsIContent* aChild, nsIContent* aPreviousSibling) {
  nsIContent* container = aChild->GetParent();
  if (!container) {
    return;
  }

  nsCOMPtr<nsIMutationObserver> kungFuDeathGrip(this);
  nsChangeObserver* obs = LookupContentChangeObserver(container);
  if (obs)
    obs->ObserveContentRemoved(aChild->OwnerDoc(), container, aChild, aPreviousSibling);
  else if (container != mContent) {
    // We do a lookup on the parent container in case things were removed
    // under a "menupopup" item. That is basically a wrapper for the contents
    // of a "menu" node.
    nsCOMPtr<nsIContent> parent = container->GetParent();
    if (parent) {
      obs = LookupContentChangeObserver(parent);
      if (obs)
        obs->ObserveContentRemoved(aChild->OwnerDoc(), aChild->GetParent(), aChild,
                                   aPreviousSibling);
    }
  }
}

void nsMenuGroupOwnerX::ContentInserted(nsIContent* aChild) {
  nsIContent* container = aChild->GetParent();
  if (!container) {
    return;
  }

  nsCOMPtr<nsIMutationObserver> kungFuDeathGrip(this);
  nsChangeObserver* obs = LookupContentChangeObserver(container);
  if (obs)
    obs->ObserveContentInserted(aChild->OwnerDoc(), container, aChild);
  else if (container != mContent) {
    // We do a lookup on the parent container in case things were removed
    // under a "menupopup" item. That is basically a wrapper for the contents
    // of a "menu" node.
    nsCOMPtr<nsIContent> parent = container->GetParent();
    if (parent) {
      obs = LookupContentChangeObserver(parent);
      if (obs) obs->ObserveContentInserted(aChild->OwnerDoc(), container, aChild);
    }
  }
}

void nsMenuGroupOwnerX::ParentChainChanged(nsIContent* aContent) {}

// For change management, we don't use a |nsSupportsHashtable| because
// we know that the lifetime of all these items is bounded by the
// lifetime of the menubar. No need to add any more strong refs to the
// picture because the containment hierarchy already uses strong refs.
void nsMenuGroupOwnerX::RegisterForContentChanges(nsIContent* aContent,
                                                  nsChangeObserver* aMenuObject) {
  if (!mContentToObserverTable.Contains(aContent)) {
    aContent->AddMutationObserver(this);
  }
  mContentToObserverTable.Put(aContent, aMenuObject);
}

void nsMenuGroupOwnerX::UnregisterForContentChanges(nsIContent* aContent) {
  if (mContentToObserverTable.Contains(aContent)) {
    aContent->RemoveMutationObserver(this);
  }
  mContentToObserverTable.Remove(aContent);
}

nsChangeObserver* nsMenuGroupOwnerX::LookupContentChangeObserver(nsIContent* aContent) {
  nsChangeObserver* result;
  if (mContentToObserverTable.Get(aContent, &result))
    return result;
  else
    return nullptr;
}

// Given a menu item, creates a unique 4-character command ID and
// maps it to the item. Returns the id for use by the client.
uint32_t nsMenuGroupOwnerX::RegisterForCommand(nsMenuItemX* inMenuItem) {
  // no real need to check for uniqueness. We always start afresh with each
  // window at 1. Even if we did get close to the reserved Apple command id's,
  // those don't start until at least '    ', which is integer 538976288. If
  // we have that many menu items in one window, I think we have other
  // problems.

  // make id unique
  ++mCurrentCommandID;

  mCommandToMenuObjectTable.Put(mCurrentCommandID, inMenuItem);

  return mCurrentCommandID;
}

// Removes the mapping between the given 4-character command ID
// and its associated menu item.
void nsMenuGroupOwnerX::UnregisterCommand(uint32_t inCommandID) {
  mCommandToMenuObjectTable.Remove(inCommandID);
}

nsMenuItemX* nsMenuGroupOwnerX::GetMenuItemForCommandID(uint32_t inCommandID) {
  nsMenuItemX* result;
  if (mCommandToMenuObjectTable.Get(inCommandID, &result))
    return result;
  else
    return nullptr;
}

void nsMenuGroupOwnerX::AddMenuItemInfoToSet(MenuItemInfo* info) { [mInfoSet addObject:info]; }