// 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.

#ifndef CHROME_BROWSER_FILE_SYSTEM_FILE_SYSTEM_DISPATCHER_HOST_H_
#define CHROME_BROWSER_FILE_SYSTEM_FILE_SYSTEM_DISPATCHER_HOST_H_

#include "base/basictypes.h"
#include "base/file_util.h"
#include "base/id_map.h"
#include "base/nullable_string16.h"
#include "base/process.h"
#include "base/platform_file.h"
#include "base/scoped_callback_factory.h"
#include "base/ref_counted.h"
#include "chrome/browser/file_system/file_system_operation.h"
#include "chrome/browser/file_system/file_system_operation_client.h"
#include "chrome/common/render_messages.h"

class FileSystemHostContext;
class HostContentSettingsMap;
class Receiver;
class ResourceMessageFilter;

class FileSystemDispatcherHost
    : public base::RefCountedThreadSafe<FileSystemDispatcherHost>,
      public FileSystemOperationClient {
 public:
  FileSystemDispatcherHost(IPC::Message::Sender* sender,
                           FileSystemHostContext* file_system_host_context,
                           HostContentSettingsMap* host_content_settings_map);
  void Init(base::ProcessHandle process_handle);
  void Shutdown();

  bool OnMessageReceived(const IPC::Message& message, bool* message_was_ok);

  void OnOpenFileSystem(const ViewHostMsg_OpenFileSystemRequest_Params&);
  void OnMove(
      int request_id,
      const string16& src_path,
      const string16& dest_path);
  void OnCopy(
      int request_id,
      const string16& src_path,
      const string16& dest_path);
  void OnRemove(
      int request_id,
      const string16& path);
  void OnReadMetadata(
      int request_id,
      const string16& path);
  void OnCreate(
      int request_id,
      const string16& path,
      bool exclusive,
      bool is_directory);
  void OnExists(
      int request_id,
      const string16& path,
      bool is_directory);
  void OnReadDirectory(
      int request_id,
      const string16& path);
  void Send(IPC::Message* message);

  // FileSystemOperationClient methods.
  virtual void DidFail(WebKit::WebFileError status, int request_id);
  virtual void DidSucceed(int request_id);
  virtual void DidReadMetadata(
      const base::PlatformFileInfo& info,
      int request_id);
  virtual void DidReadDirectory(
      const std::vector<base::file_util_proxy::Entry>& entries,
      bool has_more,
      int request_id);

 private:
  // Creates a new FileSystemOperation.
  FileSystemOperation* GetNewOperation(int request_id);

  // Checks the validity of a given |path|. Returns true if the given |path|
  // is valid as a path for FileSystem API. Otherwise it sends back a
  // security error code to the dispatcher and returns false.
  bool CheckValidFileSystemPath(const FilePath& path, int request_id);

  // The sender to be used for sending out IPC messages.
  IPC::Message::Sender* message_sender_;

  // The handle of this process.
  base::ProcessHandle process_handle_;

  bool shutdown_;

  scoped_refptr<FileSystemHostContext> context_;

  // Used to look up permissions.
  scoped_refptr<HostContentSettingsMap> host_content_settings_map_;

  // Keeps ongoing file system operations.
  typedef IDMap<FileSystemOperation, IDMapOwnPointer> OperationsMap;
  OperationsMap operations_;

  DISALLOW_COPY_AND_ASSIGN(FileSystemDispatcherHost);
};

#endif  // CHROME_BROWSER_FILE_SYSTEM_FILE_SYSTEM_DISPATCHER_HOST_H_