// Copyright (c) 2010 The Chromium Authors. All rights reserved.  Use of this
// source code is governed by a BSD-style license that can be found in the
// LICENSE file.

#include "webkit/glue/webfilesystem_impl.h"

#include "base/file_path.h"
#include "base/file_util.h"
#include "base/logging.h"
#include "net/base/file_stream.h"
#include "net/base/net_util.h"
#include "third_party/WebKit/WebKit/chromium/public/WebString.h"
#include "third_party/WebKit/WebKit/chromium/public/WebURL.h"
#include "webkit/glue/webkit_glue.h"

using WebKit::WebString;

namespace webkit_glue {

WebFileSystemImpl::WebFileSystemImpl()
    : sandbox_enabled_(true) {
}

bool WebFileSystemImpl::fileExists(const WebString& path) {
  FilePath::StringType file_path = WebStringToFilePathString(path);
  return file_util::PathExists(FilePath(file_path));
}

bool WebFileSystemImpl::deleteFile(const WebString& path) {
  NOTREACHED();
  return false;
}

bool WebFileSystemImpl::deleteEmptyDirectory(const WebString& path) {
  NOTREACHED();
  return false;
}

bool WebFileSystemImpl::getFileSize(const WebString& path, long long& result) {
  if (sandbox_enabled_) {
    NOTREACHED();
    return false;
  }
  return file_util::GetFileSize(WebStringToFilePath(path),
                                reinterpret_cast<int64*>(&result));
}

bool WebFileSystemImpl::getFileModificationTime(const WebString& path,
                                                double& result) {
  if (sandbox_enabled_) {
    NOTREACHED();
    return false;
  }
  file_util::FileInfo info;
  if (!file_util::GetFileInfo(WebStringToFilePath(path), &info))
    return false;
  result = info.last_modified.ToDoubleT();
  return true;
}

WebString WebFileSystemImpl::directoryName(const WebString& path) {
  FilePath file_path(WebStringToFilePathString(path));
  return FilePathToWebString(file_path.DirName());
}

WebString WebFileSystemImpl::pathByAppendingComponent(
    const WebString& webkit_path,
    const WebString& webkit_component) {
  FilePath path(WebStringToFilePathString(webkit_path));
  FilePath component(WebStringToFilePathString(webkit_component));
  FilePath combined_path = path.Append(component);
  return FilePathStringToWebString(combined_path.value());
}

bool WebFileSystemImpl::makeAllDirectories(const WebString& path) {
  DCHECK(!sandbox_enabled_);
  FilePath::StringType file_path = WebStringToFilePathString(path);
  return file_util::CreateDirectory(FilePath(file_path));
}

WebString WebFileSystemImpl::getAbsolutePath(const WebString& path) {
  FilePath file_path(WebStringToFilePathString(path));
  file_util::AbsolutePath(&file_path);
  return FilePathStringToWebString(file_path.value());
}

bool WebFileSystemImpl::isDirectory(const WebString& path) {
  FilePath file_path(WebStringToFilePathString(path));
  return file_util::DirectoryExists(file_path);
}

WebKit::WebURL WebFileSystemImpl::filePathToURL(const WebString& path) {
  return net::FilePathToFileURL(WebStringToFilePath(path));
}

base::PlatformFile WebFileSystemImpl::openFile(const WebString& path,
                                               int mode) {
  if (sandbox_enabled_) {
    NOTREACHED();
    return base::kInvalidPlatformFileValue;
  }
  return base::CreatePlatformFile(
      WebStringToFilePath(path),
      (mode == 0) ? (base::PLATFORM_FILE_OPEN | base::PLATFORM_FILE_READ)
                  : (base::PLATFORM_FILE_CREATE_ALWAYS |
                        base::PLATFORM_FILE_WRITE),
      NULL);
}

void WebFileSystemImpl::closeFile(base::PlatformFile& handle) {
  if (handle == base::kInvalidPlatformFileValue)
    return;
  if (base::ClosePlatformFile(handle))
    handle = base::kInvalidPlatformFileValue;
}

long long WebFileSystemImpl::seekFile(base::PlatformFile handle,
                                      long long offset,
                                      int origin) {
  if (handle == base::kInvalidPlatformFileValue)
    return -1;
  net::FileStream file_stream(handle, 0);
  return file_stream.Seek(static_cast<net::Whence>(origin), offset);
}

bool WebFileSystemImpl::truncateFile(base::PlatformFile handle,
                                     long long offset) {
  if (handle == base::kInvalidPlatformFileValue || offset < 0)
    return false;
  net::FileStream file_stream(handle, base::PLATFORM_FILE_WRITE);
  return file_stream.Truncate(offset) >= 0;
}

int WebFileSystemImpl::readFromFile(base::PlatformFile handle,
                                    char* data,
                                    int length) {
  if (handle == base::kInvalidPlatformFileValue || !data || length <= 0)
    return -1;
  std::string buffer;
  buffer.resize(length);
  net::FileStream file_stream(handle, base::PLATFORM_FILE_READ);
  return file_stream.Read(data, length, NULL);
}

int WebFileSystemImpl::writeToFile(base::PlatformFile handle,
                                   const char* data,
                                   int length) {
  if (handle == base::kInvalidPlatformFileValue || !data || length <= 0)
    return -1;
  net::FileStream file_stream(handle, base::PLATFORM_FILE_WRITE);
  return file_stream.Write(data, length, NULL);
}

}  // namespace webkit_glue