/* -*- 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 ACTION_LOG_H
#define ACTION_LOG_H

#include "db-helper.h"
#include "file-state.h"
#include "sync-log.h"
#include "action-item.pb.h"
#include "file-item.pb.h"
#include "ccnx-wrapper.h"
#include "ccnx-pco.h"

#include <boost/tuple/tuple.hpp>

class ActionLog;
typedef boost::shared_ptr<ActionLog> ActionLogPtr;
typedef boost::shared_ptr<ActionItem> ActionItemPtr;

class ActionLog : public DbHelper
{
public:
  typedef boost::function<void (std::string /*filename*/, Ccnx::Name /*device_name*/, sqlite3_int64 /*seq_no*/,
                                HashPtr /*hash*/, time_t /*m_time*/, int /*mode*/, int /*seg_num*/)> OnFileAddedOrChangedCallback;

  typedef boost::function<void (std::string /*filename*/)> OnFileRemovedCallback;

public:
  ActionLog (Ccnx::CcnxWrapperPtr ccnx, const boost::filesystem::path &path,
             SyncLogPtr syncLog,
             const std::string &sharedFolder, const std::string &appName,
             OnFileAddedOrChangedCallback onFileAddedOrChanged, OnFileRemovedCallback onFileRemoved);

  virtual ~ActionLog () { }

  //////////////////////////
  // Local operations     //
  //////////////////////////
  ActionItemPtr
  AddLocalActionUpdate (const std::string &filename,
                        const Hash &hash,
                        time_t wtime,
                        int mode,
                        int seg_num);

  // void
  // AddActionMove (const std::string &oldFile, const std::string &newFile);

  ActionItemPtr
  AddLocalActionDelete (const std::string &filename);

  //////////////////////////
  // Remote operations    //
  //////////////////////////

  ActionItemPtr
  AddRemoteAction (const Ccnx::Name &deviceName, sqlite3_int64 seqno, Ccnx::PcoPtr actionPco);

  /**
   * @brief Add remote action using just action's parsed content object
   *
   * This function extracts device name and sequence number from the content object's and calls the overloaded method
   */
  ActionItemPtr
  AddRemoteAction (Ccnx::PcoPtr actionPco);

  ///////////////////////////
  // General operations    //
  ///////////////////////////

  Ccnx::PcoPtr
  LookupActionPco (const Ccnx::Name &deviceName, sqlite3_int64 seqno);

  Ccnx::PcoPtr
  LookupActionPco (const Ccnx::Name &actionName);

  ActionItemPtr
  LookupAction (const Ccnx::Name &deviceName, sqlite3_int64 seqno);

  ActionItemPtr
  LookupAction (const Ccnx::Name &actionName);

  FileItemPtr
  LookupAction (const std::string &filename, sqlite3_int64 version, const Hash &filehash);

  /**
   * @brief Lookup up to [limit] actions starting [offset] in decreasing order (by timestamp) and calling visitor(device_name,seqno,action) for each action
   */
  bool
  LookupActionsInFolderRecursively (const boost::function<void (const Ccnx::Name &name, sqlite3_int64 seq_no, const ActionItem &)> &visitor,
                                    const std::string &folder, int offset=0, int limit=-1);

  bool
  LookupActionsForFile (const boost::function<void (const Ccnx::Name &name, sqlite3_int64 seq_no, const ActionItem &)> &visitor,
                        const std::string &file, int offset=0, int limit=-1);

  void
  LookupRecentFileActions(const boost::function<void (const std::string &, int, int)> &visitor, int limit = 5);

  //
  inline FileStatePtr
  GetFileState ();

public:
  // for test purposes
  sqlite3_int64
  LogSize ();

private:
  boost::tuple<sqlite3_int64 /*version*/, Ccnx::CcnxCharbufPtr /*device name*/, sqlite3_int64 /*seq_no*/>
  GetLatestActionForFile (const std::string &filename);

  static void
  apply_action_xFun (sqlite3_context *context, int argc, sqlite3_value **argv);

private:
  SyncLogPtr m_syncLog;
  FileStatePtr m_fileState;

  Ccnx::CcnxWrapperPtr m_ccnx;
  std::string m_sharedFolderName;
  std::string m_appName;

  OnFileAddedOrChangedCallback m_onFileAddedOrChanged;
  OnFileRemovedCallback        m_onFileRemoved;
};

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

inline FileStatePtr
ActionLog::GetFileState ()
{
  return m_fileState;
}


#endif // ACTION_LOG_H