/*
 * Copyright (C) 2013 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "public/platform/WebFileSystemCallbacks.h"

#include "platform/AsyncFileSystemCallbacks.h"
#include "platform/FileMetadata.h"
#include "public/platform/WebFileInfo.h"
#include "public/platform/WebFileSystem.h"
#include "public/platform/WebFileSystemEntry.h"
#include "public/platform/WebFileWriter.h"
#include "public/platform/WebString.h"
#include "wtf/PassRefPtr.h"
#include "wtf/PtrUtil.h"
#include "wtf/RefCounted.h"
#include <memory>

namespace blink {

class WebFileSystemCallbacksPrivate
    : public RefCounted<WebFileSystemCallbacksPrivate> {
 public:
  static PassRefPtr<WebFileSystemCallbacksPrivate> create(
      std::unique_ptr<AsyncFileSystemCallbacks> callbacks) {
    return adoptRef(new WebFileSystemCallbacksPrivate(std::move(callbacks)));
  }

  AsyncFileSystemCallbacks* callbacks() { return m_callbacks.get(); }

 private:
  WebFileSystemCallbacksPrivate(
      std::unique_ptr<AsyncFileSystemCallbacks> callbacks)
      : m_callbacks(std::move(callbacks)) {}
  std::unique_ptr<AsyncFileSystemCallbacks> m_callbacks;
};

WebFileSystemCallbacks::WebFileSystemCallbacks(
    std::unique_ptr<AsyncFileSystemCallbacks>&& callbacks) {
  m_private = WebFileSystemCallbacksPrivate::create(std::move(callbacks));
}

void WebFileSystemCallbacks::reset() {
  m_private.reset();
}

void WebFileSystemCallbacks::assign(const WebFileSystemCallbacks& other) {
  m_private = other.m_private;
}

void WebFileSystemCallbacks::didSucceed() {
  ASSERT(!m_private.isNull());
  m_private->callbacks()->didSucceed();
  m_private.reset();
}

void WebFileSystemCallbacks::didReadMetadata(const WebFileInfo& webFileInfo) {
  ASSERT(!m_private.isNull());
  FileMetadata fileMetadata;
  fileMetadata.modificationTime = webFileInfo.modificationTime;
  fileMetadata.length = webFileInfo.length;
  fileMetadata.type = static_cast<FileMetadata::Type>(webFileInfo.type);
  fileMetadata.platformPath = webFileInfo.platformPath;
  m_private->callbacks()->didReadMetadata(fileMetadata);
  m_private.reset();
}

void WebFileSystemCallbacks::didCreateSnapshotFile(
    const WebFileInfo& webFileInfo) {
  ASSERT(!m_private.isNull());
  // It's important to create a BlobDataHandle that refers to the platform file
  // path prior to return from this method so the underlying file will not be
  // deleted.
  std::unique_ptr<BlobData> blobData = BlobData::create();
  blobData->appendFile(webFileInfo.platformPath, 0, webFileInfo.length,
                       invalidFileTime());
  RefPtr<BlobDataHandle> snapshotBlob =
      BlobDataHandle::create(std::move(blobData), webFileInfo.length);

  FileMetadata fileMetadata;
  fileMetadata.modificationTime = webFileInfo.modificationTime;
  fileMetadata.length = webFileInfo.length;
  fileMetadata.type = static_cast<FileMetadata::Type>(webFileInfo.type);
  fileMetadata.platformPath = webFileInfo.platformPath;
  m_private->callbacks()->didCreateSnapshotFile(fileMetadata, snapshotBlob);
  m_private.reset();
}

void WebFileSystemCallbacks::didReadDirectory(
    const WebVector<WebFileSystemEntry>& entries,
    bool hasMore) {
  ASSERT(!m_private.isNull());
  for (size_t i = 0; i < entries.size(); ++i)
    m_private->callbacks()->didReadDirectoryEntry(entries[i].name,
                                                  entries[i].isDirectory);
  m_private->callbacks()->didReadDirectoryEntries(hasMore);
  m_private.reset();
}

void WebFileSystemCallbacks::didOpenFileSystem(const WebString& name,
                                               const WebURL& rootURL) {
  ASSERT(!m_private.isNull());
  m_private->callbacks()->didOpenFileSystem(name, rootURL);
  m_private.reset();
}

void WebFileSystemCallbacks::didResolveURL(const WebString& name,
                                           const WebURL& rootURL,
                                           WebFileSystemType type,
                                           const WebString& filePath,
                                           bool isDirectory) {
  ASSERT(!m_private.isNull());
  m_private->callbacks()->didResolveURL(
      name, rootURL, static_cast<FileSystemType>(type), filePath, isDirectory);
  m_private.reset();
}

void WebFileSystemCallbacks::didCreateFileWriter(WebFileWriter* webFileWriter,
                                                 long long length) {
  ASSERT(!m_private.isNull());
  m_private->callbacks()->didCreateFileWriter(wrapUnique(webFileWriter),
                                              length);
  m_private.reset();
}

void WebFileSystemCallbacks::didFail(WebFileError error) {
  ASSERT(!m_private.isNull());
  m_private->callbacks()->didFail(error);
  m_private.reset();
}

bool WebFileSystemCallbacks::shouldBlockUntilCompletion() const {
  ASSERT(!m_private.isNull());
  return m_private->callbacks()->shouldBlockUntilCompletion();
}

}  // namespace blink