/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "modules/filesystem/DataTransferItemFileSystem.h"

#include "core/clipboard/DataObject.h"
#include "core/clipboard/DataTransfer.h"
#include "core/clipboard/DataTransferItem.h"
#include "core/dom/ExecutionContext.h"
#include "core/fileapi/File.h"
#include "modules/filesystem/DOMFilePath.h"
#include "modules/filesystem/DOMFileSystem.h"
#include "modules/filesystem/DirectoryEntry.h"
#include "modules/filesystem/DraggedIsolatedFileSystemImpl.h"
#include "modules/filesystem/Entry.h"
#include "modules/filesystem/FileEntry.h"
#include "platform/AsyncFileSystemCallbacks.h"
#include "platform/FileMetadata.h"

namespace blink {

// static
Entry* DataTransferItemFileSystem::webkitGetAsEntry(
    ExecutionContext* executionContext,
    DataTransferItem& item) {
  if (!item.getDataObjectItem()->isFilename())
    return 0;

  // For dragged files getAsFile must be pretty lightweight.
  Blob* file = item.getAsFile();
  // The clipboard may not be in a readable state.
  if (!file)
    return 0;
  ASSERT(file->isFile());

  DOMFileSystem* domFileSystem =
      DraggedIsolatedFileSystemImpl::getDOMFileSystem(
          item.getDataTransfer()->dataObject(), executionContext);
  if (!domFileSystem) {
    // IsolatedFileSystem may not be enabled.
    return 0;
  }

  // The dropped entries are mapped as top-level entries in the isolated
  // filesystem.
  String virtualPath = DOMFilePath::append("/", toFile(file)->name());

  // FIXME: This involves synchronous file operation. Consider passing file type
  // data when we dispatch drag event.
  FileMetadata metadata;
  if (!getFileMetadata(toFile(file)->path(), metadata))
    return 0;

  if (metadata.type == FileMetadata::TypeDirectory)
    return DirectoryEntry::create(domFileSystem, virtualPath);
  return FileEntry::create(domFileSystem, virtualPath);
}

}  // namespace blink