// Copyright 2013 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.
//
// This file provides file system related API functions.

#ifndef CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_FILE_SYSTEM_H_
#define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_FILE_SYSTEM_H_

#include <string>

#include "base/platform_file.h"
#include "chrome/browser/chromeos/drive/file_errors.h"
#include "chrome/browser/chromeos/extensions/file_manager/private_api_base.h"

class GURL;

namespace base {
class FilePath;
}

namespace fileapi {
class FileSystemContext;
}

namespace file_manager {

// Implements the chrome.fileBrowserPrivate.requestFileSystem method.
class RequestFileSystemFunction : public LoggedAsyncExtensionFunction {
 public:
  DECLARE_EXTENSION_FUNCTION("fileBrowserPrivate.requestFileSystem",
                             FILEBROWSERPRIVATE_REQUESTFILESYSTEM)

  RequestFileSystemFunction();

 protected:
  virtual ~RequestFileSystemFunction();

  // AsyncExtensionFunction overrides.
  virtual bool RunImpl() OVERRIDE;

 private:
  void RespondSuccessOnUIThread(const std::string& name,
                                const GURL& root_path);
  void RespondFailedOnUIThread(base::PlatformFileError error_code);

  // Called when FileSystemContext::OpenFileSystem() is done.
  void DidOpenFileSystem(
      scoped_refptr<fileapi::FileSystemContext> file_system_context,
      base::PlatformFileError result,
      const std::string& name,
      const GURL& root_path);

  // Called when something goes wrong. Records the error to |error_| per the
  // error code and reports that the private API function failed.
  void DidFail(base::PlatformFileError error_code);

  // Sets up file system access permissions to the extension identified by
  // |child_id|.
  bool SetupFileSystemAccessPermissions(
      scoped_refptr<fileapi::FileSystemContext> file_system_context,
      int child_id,
      scoped_refptr<const extensions::Extension> extension);
};

// Base class for AddFileWatchFunction and RemoveFileWatchFunction. Although
// it's called "FileWatch", the class and its sub classes are used only for
// watching changes in directories.
class FileWatchFunctionBase : public LoggedAsyncExtensionFunction {
 public:
  FileWatchFunctionBase();

 protected:
  virtual ~FileWatchFunctionBase();

  // Performs a file watch operation (ex. adds or removes a file watch).
  virtual void PerformFileWatchOperation(
      const base::FilePath& local_path,
      const base::FilePath& virtual_path,
      const std::string& extension_id) = 0;

  // AsyncExtensionFunction overrides.
  virtual bool RunImpl() OVERRIDE;

  // Calls SendResponse() with |success| converted to base::Value.
  void Respond(bool success);
};

// Implements the chrome.fileBrowserPrivate.addFileWatch method.
// Starts watching changes in directories.
class AddFileWatchFunction : public FileWatchFunctionBase {
 public:
  DECLARE_EXTENSION_FUNCTION("fileBrowserPrivate.addFileWatch",
                             FILEBROWSERPRIVATE_ADDFILEWATCH)

  AddFileWatchFunction();

 protected:
  virtual ~AddFileWatchFunction();

  // FileWatchFunctionBase override.
  virtual void PerformFileWatchOperation(
      const base::FilePath& local_path,
      const base::FilePath& virtual_path,
      const std::string& extension_id) OVERRIDE;
};


// Implements the chrome.fileBrowserPrivate.removeFileWatch method.
// Stops watching changes in directories.
class RemoveFileWatchFunction : public FileWatchFunctionBase {
 public:
  DECLARE_EXTENSION_FUNCTION("fileBrowserPrivate.removeFileWatch",
                             FILEBROWSERPRIVATE_REMOVEFILEWATCH)

  RemoveFileWatchFunction();

 protected:
  virtual ~RemoveFileWatchFunction();

  // FileWatchFunctionBase override.
  virtual void PerformFileWatchOperation(
      const base::FilePath& local_path,
      const base::FilePath& virtual_path,
      const std::string& extension_id) OVERRIDE;
};

// Implements the chrome.fileBrowserPrivate.setLastModified method.
// Sets last modified date in seconds of local file
class SetLastModifiedFunction : public LoggedAsyncExtensionFunction {
 public:
  DECLARE_EXTENSION_FUNCTION("fileBrowserPrivate.setLastModified",
                             FILEBROWSERPRIVATE_SETLASTMODIFIED)

  SetLastModifiedFunction();

 protected:
  virtual ~SetLastModifiedFunction();

  // AsyncExtensionFunction overrides.
  virtual bool RunImpl() OVERRIDE;
};

// Implements the chrome.fileBrowserPrivate.getSizeStats method.
class GetSizeStatsFunction : public LoggedAsyncExtensionFunction {
 public:
  DECLARE_EXTENSION_FUNCTION("fileBrowserPrivate.getSizeStats",
                             FILEBROWSERPRIVATE_GETSIZESTATS)

  GetSizeStatsFunction();

 protected:
  virtual ~GetSizeStatsFunction();

  // AsyncExtensionFunction overrides.
  virtual bool RunImpl() OVERRIDE;

 private:
  void GetDriveAvailableSpaceCallback(drive::FileError error,
                                      int64 bytes_total,
                                      int64 bytes_used);

  void GetSizeStatsCallback(const uint64* total_size,
                            const uint64* remaining_size);
};

// Implements the chrome.fileBrowserPrivate.getVolumeMetadata method.
// Retrieves devices meta-data. Expects volume's device path as an argument.
class GetVolumeMetadataFunction : public LoggedAsyncExtensionFunction {
 public:
  DECLARE_EXTENSION_FUNCTION("fileBrowserPrivate.getVolumeMetadata",
                             FILEBROWSERPRIVATE_GETVOLUMEMETADATA)

  GetVolumeMetadataFunction();

 protected:
  virtual ~GetVolumeMetadataFunction();

  // AsyncExtensionFunction overrides.
  virtual bool RunImpl() OVERRIDE;
};

// Implements the chrome.fileBrowserPrivate.validatePathNameLength method.
class ValidatePathNameLengthFunction : public LoggedAsyncExtensionFunction {
 public:
  DECLARE_EXTENSION_FUNCTION("fileBrowserPrivate.validatePathNameLength",
                             FILEBROWSERPRIVATE_VALIDATEPATHNAMELENGTH)

  ValidatePathNameLengthFunction();

 protected:
  virtual ~ValidatePathNameLengthFunction();

  void OnFilePathLimitRetrieved(size_t current_length, size_t max_length);

  // AsyncExtensionFunction overrides.
  virtual bool RunImpl() OVERRIDE;
};

// Implements the chrome.fileBrowserPrivate.formatDevice method.
// Formats Device given its mount path.
class FormatDeviceFunction : public LoggedAsyncExtensionFunction {
 public:
  DECLARE_EXTENSION_FUNCTION("fileBrowserPrivate.formatDevice",
                             FILEBROWSERPRIVATE_FORMATDEVICE)

  FormatDeviceFunction();

 protected:
  virtual ~FormatDeviceFunction();

  // AsyncExtensionFunction overrides.
  virtual bool RunImpl() OVERRIDE;
};

}  // namespace file_manager

#endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_FILE_SYSTEM_H_