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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * 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/. */

/*

  A package of routines shared by the XUL content code.

 */

#include "mozilla/ArrayUtils.h"

#include "nsCollationCID.h"
#include "nsCOMPtr.h"
#include "nsIContent.h"
#include "nsICollation.h"
#include "nsIDocument.h"
#include "nsIDOMElement.h"
#include "nsIDOMXULCommandDispatcher.h"
#include "nsIRDFService.h"
#include "nsIServiceManager.h"
#include "nsXULContentUtils.h"
#include "nsLayoutCID.h"
#include "nsRDFCID.h"
#include "nsString.h"
#include "nsGkAtoms.h"
#include "XULDocument.h"

using namespace mozilla;
using dom::XULDocument;

//------------------------------------------------------------------------

nsIRDFService* nsXULContentUtils::gRDF;
nsICollation* nsXULContentUtils::gCollation;

//------------------------------------------------------------------------
// Constructors n' stuff
//

nsresult nsXULContentUtils::Init() {
  static NS_DEFINE_CID(kRDFServiceCID, NS_RDFSERVICE_CID);
  nsresult rv = CallGetService(kRDFServiceCID, &gRDF);
  if (NS_FAILED(rv)) {
    return rv;
  }

  return NS_OK;
}

nsresult nsXULContentUtils::Finish() {
  NS_IF_RELEASE(gRDF);
  NS_IF_RELEASE(gCollation);

  return NS_OK;
}

nsICollation* nsXULContentUtils::GetCollation() {
  if (!gCollation) {
    nsCOMPtr<nsICollationFactory> colFactory =
        do_CreateInstance(NS_COLLATIONFACTORY_CONTRACTID);
    if (colFactory) {
      DebugOnly<nsresult> rv = colFactory->CreateCollation(&gCollation);
      NS_ASSERTION(NS_SUCCEEDED(rv), "couldn't create collation instance");
    } else
      NS_ERROR("couldn't create instance of collation factory");
  }

  return gCollation;
}

//------------------------------------------------------------------------
//

nsresult nsXULContentUtils::FindChildByTag(nsIContent* aElement,
                                           int32_t aNameSpaceID, nsAtom* aTag,
                                           Element** aResult) {
  for (nsIContent* child = aElement->GetFirstChild(); child;
       child = child->GetNextSibling()) {
    if (child->IsElement() && child->NodeInfo()->Equals(aTag, aNameSpaceID)) {
      NS_ADDREF(*aResult = child->AsElement());
      return NS_OK;
    }
  }

  *aResult = nullptr;
  return NS_RDF_NO_VALUE;  // not found
}

nsresult nsXULContentUtils::SetCommandUpdater(nsIDocument* aDocument,
                                              Element* aElement) {
  // Deal with setting up a 'commandupdater'. Pulls the 'events' and
  // 'targets' attributes off of aElement, and adds it to the
  // document's command dispatcher.
  NS_PRECONDITION(aDocument != nullptr, "null ptr");
  if (!aDocument) return NS_ERROR_NULL_POINTER;

  NS_PRECONDITION(aElement != nullptr, "null ptr");
  if (!aElement) return NS_ERROR_NULL_POINTER;

  nsresult rv;

  XULDocument* xuldoc = aDocument->AsXULDocument();
  NS_ASSERTION(xuldoc != nullptr, "not a xul document");
  if (!xuldoc) return NS_ERROR_UNEXPECTED;

  nsCOMPtr<nsIDOMXULCommandDispatcher> dispatcher =
      xuldoc->GetCommandDispatcher();
  NS_ASSERTION(dispatcher != nullptr, "no dispatcher");
  if (!dispatcher) return NS_ERROR_UNEXPECTED;

  nsAutoString events;
  aElement->GetAttr(kNameSpaceID_None, nsGkAtoms::events, events);
  if (events.IsEmpty()) events.Assign('*');

  nsAutoString targets;
  aElement->GetAttr(kNameSpaceID_None, nsGkAtoms::targets, targets);

  if (targets.IsEmpty()) targets.Assign('*');

  nsCOMPtr<nsIDOMElement> domelement = do_QueryInterface(aElement);
  NS_ASSERTION(domelement != nullptr, "not a DOM element");
  if (!domelement) return NS_ERROR_UNEXPECTED;

  rv = dispatcher->AddCommandUpdater(domelement, events, targets);
  if (NS_FAILED(rv)) return rv;

  return NS_OK;
}