/*
 *      Copyright (C) 2005-2013 Team XBMC
 *      http://xbmc.org
 *
 *  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, 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 XBMC; see the file COPYING.  If not, see
 *  <http://www.gnu.org/licenses/>.
 *
 */

#include "DVDMessageQueue.h"
#include "DVDDemuxers/DVDDemuxUtils.h"
#include "utils/log.h"
#include "threads/SingleLock.h"
#include "DVDClock.h"
#include "utils/MathUtils.h"

using namespace std;

CDVDMessageQueue::CDVDMessageQueue(const string &owner) : m_hEvent(true), m_owner(owner)
{
  m_iDataSize     = 0;
  m_bAbortRequest = false;
  m_bInitialized  = false;
  m_bCaching      = false;
  m_bEmptied      = true;

  m_TimeBack      = DVD_NOPTS_VALUE;
  m_TimeFront     = DVD_NOPTS_VALUE;
  m_TimeSize      = 1.0 / 4.0; /* 4 seconds */
  m_iMaxDataSize  = 0;
}

CDVDMessageQueue::~CDVDMessageQueue()
{
  // remove all remaining messages
  Flush(CDVDMsg::NONE);
}

void CDVDMessageQueue::Init()
{
  m_iDataSize     = 0;
  m_bAbortRequest = false;
  m_bEmptied      = true;
  m_bInitialized  = true;
  m_TimeBack      = DVD_NOPTS_VALUE;
  m_TimeFront     = DVD_NOPTS_VALUE;
}

void CDVDMessageQueue::Flush(CDVDMsg::Message type)
{
  CSingleLock lock(m_section);

  for(SList::iterator it = m_list.begin(); it != m_list.end();)
  {
    if (it->message->IsType(type) ||  type == CDVDMsg::NONE)
      it = m_list.erase(it);
    else
      ++it;
  }

  if (type == CDVDMsg::DEMUXER_PACKET ||  type == CDVDMsg::NONE)
  {
    m_iDataSize = 0;
    m_TimeBack  = DVD_NOPTS_VALUE;
    m_TimeFront = DVD_NOPTS_VALUE;
    m_bEmptied = true;
  }
}

void CDVDMessageQueue::Abort()
{
  CSingleLock lock(m_section);

  m_bAbortRequest = true;

  m_hEvent.Set(); // inform waiter for abort action
}

void CDVDMessageQueue::End()
{
  CSingleLock lock(m_section);

  Flush(CDVDMsg::NONE);

  m_bInitialized  = false;
  m_iDataSize     = 0;
  m_bAbortRequest = false;
}


MsgQueueReturnCode CDVDMessageQueue::Put(CDVDMsg* pMsg, int priority)
{
  CSingleLock lock(m_section);

  if (!m_bInitialized)
  {
    CLog::Log(LOGWARNING, "CDVDMessageQueue(%s)::Put MSGQ_NOT_INITIALIZED", m_owner.c_str());
    pMsg->Release();
    return MSGQ_NOT_INITIALIZED;
  }
  if (!pMsg)
  {
    CLog::Log(LOGFATAL, "CDVDMessageQueue(%s)::Put MSGQ_INVALID_MSG", m_owner.c_str());
    return MSGQ_INVALID_MSG;
  }

  SList::iterator it = m_list.begin();
  while(it != m_list.end())
  {
    if(priority <= it->priority)
      break;
    ++it;
  }
  m_list.insert(it, DVDMessageListItem(pMsg, priority));

  if (pMsg->IsType(CDVDMsg::DEMUXER_PACKET) && priority == 0)
  {
    DemuxPacket* packet = ((CDVDMsgDemuxerPacket*)pMsg)->GetPacket();
    if(packet)
    {
      m_iDataSize += packet->iSize;
      if     (packet->dts != DVD_NOPTS_VALUE)
        m_TimeFront = packet->dts;
      else if(packet->pts != DVD_NOPTS_VALUE)
        m_TimeFront = packet->pts;
      if(m_TimeBack == DVD_NOPTS_VALUE)
        m_TimeBack = m_TimeFront;
    }
  }

  pMsg->Release();

  m_hEvent.Set(); // inform waiter for new packet

  return MSGQ_OK;
}

MsgQueueReturnCode CDVDMessageQueue::Get(CDVDMsg** pMsg, unsigned int iTimeoutInMilliSeconds, int &priority)
{
  CSingleLock lock(m_section);

  *pMsg = NULL;

  int ret = 0;

  if (!m_bInitialized)
  {
    CLog::Log(LOGFATAL, "CDVDMessageQueue(%s)::Get MSGQ_NOT_INITIALIZED", m_owner.c_str());
    return MSGQ_NOT_INITIALIZED;
  }

  if(m_list.empty() && m_bEmptied == false && priority == 0 && m_owner != "teletext")
  {
#if !defined(TARGET_RASPBERRY_PI)
    CLog::Log(LOGWARNING, "CDVDMessageQueue(%s)::Get - asked for new data packet, with nothing available", m_owner.c_str());
#endif
    m_bEmptied = true;
  }

  while (!m_bAbortRequest)
  {
    if(!m_list.empty() && m_list.back().priority >= priority && !m_bCaching)
    {
      DVDMessageListItem& item(m_list.back());
      priority = item.priority;

      if (item.message->IsType(CDVDMsg::DEMUXER_PACKET) && item.priority == 0)
      {
        DemuxPacket* packet = ((CDVDMsgDemuxerPacket*)item.message)->GetPacket();
        if(packet)
        {
          m_iDataSize -= packet->iSize;
          if     (packet->dts != DVD_NOPTS_VALUE)
            m_TimeBack = packet->dts;
          else if(packet->pts != DVD_NOPTS_VALUE)
            m_TimeBack = packet->pts;
        }

        if(m_bEmptied && m_iDataSize > 0)
          m_bEmptied = false;
      }

      *pMsg = item.message->Acquire();
      m_list.pop_back();

      ret = MSGQ_OK;
      break;
    }
    else if (!iTimeoutInMilliSeconds)
    {
      ret = MSGQ_TIMEOUT;
      break;
    }
    else
    {
      m_hEvent.Reset();
      lock.Leave();

      // wait for a new message
      if (!m_hEvent.WaitMSec(iTimeoutInMilliSeconds))
        return MSGQ_TIMEOUT;

      lock.Enter();
    }
  }

  if (m_bAbortRequest) return MSGQ_ABORT;

  return (MsgQueueReturnCode)ret;
}


unsigned CDVDMessageQueue::GetPacketCount(CDVDMsg::Message type)
{
  CSingleLock lock(m_section);

  if (!m_bInitialized)
    return 0;

  unsigned count = 0;
  for(SList::iterator it = m_list.begin(); it != m_list.end();++it)
  {
    if(it->message->IsType(type))
      count++;
  }

  return count;
}

void CDVDMessageQueue::WaitUntilEmpty()
{
    CLog::Log(LOGNOTICE, "CDVDMessageQueue(%s)::WaitUntilEmpty", m_owner.c_str());
    CDVDMsgGeneralSynchronize* msg = new CDVDMsgGeneralSynchronize(40000, 0);
    Put(msg->Acquire());
    msg->Wait(&m_bAbortRequest, 0);
    msg->Release();
}

int CDVDMessageQueue::GetLevel() const
{
  CSingleLock lock(m_section);

  if(m_iDataSize > m_iMaxDataSize)
    return 100;
  if(m_iDataSize == 0)
    return 0;

  if(IsDataBased())
    return min(100, 100 * m_iDataSize / m_iMaxDataSize);

  return min(100, MathUtils::round_int(100.0 * m_TimeSize * (m_TimeFront - m_TimeBack) / DVD_TIME_BASE ));
}

int CDVDMessageQueue::GetTimeSize() const
{
  CSingleLock lock(m_section);

  if(IsDataBased())
    return 0;
  else
    return (int)((m_TimeFront - m_TimeBack) / DVD_TIME_BASE);
}

bool CDVDMessageQueue::IsDataBased() const
{
  return (m_TimeBack == DVD_NOPTS_VALUE  ||
          m_TimeFront == DVD_NOPTS_VALUE ||
          m_TimeFront <= m_TimeBack);
}
