/* -*- 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 "FileSystemFileEntry.h"
#include "CallbackRunnables.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/MultipartBlobImpl.h"
#include "mozilla/dom/FileSystemFileEntryBinding.h"

namespace mozilla {
namespace dom {

namespace {

class FileCallbackRunnable final : public Runnable
{
public:
  FileCallbackRunnable(FileCallback* aCallback, ErrorCallback* aErrorCallback,
                       File* aFile)
    : mCallback(aCallback)
    , mErrorCallback(aErrorCallback)
    , mFile(aFile)
  {
    MOZ_ASSERT(aCallback);
    MOZ_ASSERT(aFile);
  }

  NS_IMETHOD
  Run() override
  {
    // Here we clone the File object.

    nsAutoString name;
    mFile->GetName(name);

    nsAutoString type;
    mFile->GetType(type);

    nsTArray<RefPtr<BlobImpl>> blobImpls;
    blobImpls.AppendElement(mFile->Impl());

    ErrorResult rv;
    RefPtr<BlobImpl> blobImpl =
      MultipartBlobImpl::Create(Move(blobImpls), name, type, rv);
    if (NS_WARN_IF(rv.Failed())) {
      if (mErrorCallback) {
        RefPtr<DOMException> exception =
          DOMException::Create(rv.StealNSResult());
        mErrorCallback->HandleEvent(*exception);
      }

      return NS_OK;
    }

    RefPtr<File> file = File::Create(mFile->GetParentObject(), blobImpl);
    MOZ_ASSERT(file);

    mCallback->HandleEvent(*file);
    return NS_OK;
  }

private:
  RefPtr<FileCallback> mCallback;
  RefPtr<ErrorCallback> mErrorCallback;
  RefPtr<File> mFile;
};

} // anonymous namespace

NS_IMPL_CYCLE_COLLECTION_INHERITED(FileSystemFileEntry, FileSystemEntry, mFile)

NS_IMPL_ADDREF_INHERITED(FileSystemFileEntry, FileSystemEntry)
NS_IMPL_RELEASE_INHERITED(FileSystemFileEntry, FileSystemEntry)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(FileSystemFileEntry)
NS_INTERFACE_MAP_END_INHERITING(FileSystemEntry)

FileSystemFileEntry::FileSystemFileEntry(nsIGlobalObject* aGlobal,
                                         File* aFile,
                                         FileSystemDirectoryEntry* aParentEntry,
                                         FileSystem* aFileSystem)
  : FileSystemEntry(aGlobal, aParentEntry, aFileSystem)
  , mFile(aFile)
{
  MOZ_ASSERT(aGlobal);
  MOZ_ASSERT(mFile);
}

FileSystemFileEntry::~FileSystemFileEntry()
{}

JSObject*
FileSystemFileEntry::WrapObject(JSContext* aCx,
                                JS::Handle<JSObject*> aGivenProto)
{
  return FileSystemFileEntryBinding::Wrap(aCx, this, aGivenProto);
}

void
FileSystemFileEntry::GetName(nsAString& aName, ErrorResult& aRv) const
{
  mFile->GetName(aName);
}

void
FileSystemFileEntry::GetFullPath(nsAString& aPath, ErrorResult& aRv) const
{
  mFile->Impl()->GetDOMPath(aPath);
  if (aPath.IsEmpty()) {
    // We're under the root directory. webkitRelativePath
    // (implemented as GetPath) is for cases when file is selected because its
    // ancestor directory is selected. But that is not the case here, so need to
    // manually prepend '/'.
    nsAutoString name;
    mFile->GetName(name);
    aPath.AssignLiteral(FILESYSTEM_DOM_PATH_SEPARATOR_LITERAL);
    aPath.Append(name);
  }
}

void
FileSystemFileEntry::GetFile(FileCallback& aSuccessCallback,
                             const Optional<OwningNonNull<ErrorCallback>>& aErrorCallback) const
{
  RefPtr<FileCallbackRunnable> runnable =
    new FileCallbackRunnable(&aSuccessCallback,
                             aErrorCallback.WasPassed()
                               ? &aErrorCallback.Value() : nullptr,
                             mFile);
  DebugOnly<nsresult> rv = NS_DispatchToMainThread(runnable);
  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "NS_DispatchToMainThread failed");
}

} // dom namespace
} // mozilla namespace