/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2012-2013 University of California, Los Angeles
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
 *	   Zhenkai Zhu <zhenkai@cs.ucla.edu>
 */

#ifndef FILE_STATE_H
#define FILE_STATE_H

#include "db-helper.h"

#include "ndnx-name.h"
#include "file-item.pb.h"
#include "hash-helper.h"

#include <boost/tuple/tuple.hpp>
#include <boost/exception/all.hpp>

#include <list>

typedef std::list<FileItem> FileItems;
typedef boost::shared_ptr<FileItem>  FileItemPtr;
typedef boost::shared_ptr<FileItems> FileItemsPtr;


class FileState : public DbHelper
{
public:
  FileState (const boost::filesystem::path &path, bool cow = false);
  ~FileState ();

  /**
   * @brief Update or add a file
   */
  void
  UpdateFile (const std::string &filename, sqlite3_int64 version,
              const Hash &hash, const Ndnx::NdnxCharbuf &device_name, sqlite3_int64 seqno,
              time_t atime, time_t mtime, time_t ctime, int mode, int seg_num);

  /**
   * @brief Delete file
   */
  void
  DeleteFile (const std::string &filename);

  /**
   * @brief Set "complete" flag
   *
   * The call will do nothing if FileState does not have a record for the file (e.g., file got subsequently deleted)
   */
  void
  SetFileComplete (const std::string &filename);

  /**
   * @brief Lookup file state using file name
   */
  FileItemPtr
  LookupFile (const std::string &filename) ;

  /**
   * @brief Lookup file state using content hash (multiple items may be returned)
   */
  FileItemsPtr
  LookupFilesForHash (const Hash &hash);

  /**
   * @brief Lookup all files in the specified folder and call visitor(file) for each file
   */
  void
  LookupFilesInFolder (const boost::function<void (const FileItem&)> &visitor, const std::string &folder, int offset=0, int limit=-1);

  /**
   * @brief Lookup all files in the specified folder (wrapper around the overloaded version)
   */
  FileItemsPtr
  LookupFilesInFolder (const std::string &folder, int offset=0, int limit=-1);

  /**
   * @brief Recursively lookup all files in the specified folder and call visitor(file) for each file
   */
  bool
  LookupFilesInFolderRecursively (const boost::function<void (const FileItem&)> &visitor, const std::string &folder, int offset=0, int limit=-1);

  /**
   * @brief Recursively lookup all files in the specified folder (wrapper around the overloaded version)
   */
  FileItemsPtr
  LookupFilesInFolderRecursively (const std::string &folder, int offset=0, int limit=-1);
};

typedef boost::shared_ptr<FileState> FileStatePtr;

namespace Error {
struct FileState : virtual boost::exception, virtual std::exception { };
}


#endif // ACTION_LOG_H