// Copyright (C) 2010,2011,2012 GlavSoft LLC.
// All rights reserved.
//
//-------------------------------------------------------------------------
// This file is part of the TightVNC software.  Please visit our Web site:
//
//                       http://www.tightvnc.com/
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// 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.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//-------------------------------------------------------------------------
//

#include "AuthTracker.h"
#include "thread/AutoLock.h"

AuthTracker::AuthTracker(UINT64 failureTimeInterval,
                         unsigned int failureMaxCount)
: m_failureCount(0),
  m_failureTimeInterval(failureTimeInterval),
  m_failureMaxCount(failureMaxCount)
{
}

AuthTracker::~AuthTracker()
{
}

UINT64 AuthTracker::checkBan()
{
  refresh();

  UINT64 banTime = 0;
  {
    AutoLock al(&m_countMutex);
    if (m_failureCount >= m_failureMaxCount) {
      banTime = max(0, m_failureTimeInterval -
                       (DateTime::now() - m_firstFailureTime).getTime());
    }
  }
  return banTime;
}

void AuthTracker::notifyAbAuthFailed()
{
  AutoLock al(&m_countMutex);
  if (m_failureCount == 0) {
    m_firstFailureTime = DateTime::now();
  }
  m_failureCount++;
}

void AuthTracker::refresh()
{
  AutoLock al(&m_countMutex);
  if ((DateTime::now() - m_firstFailureTime).getTime() >= m_failureTimeInterval) {
    m_failureCount = 0;
  }
}
