/**

 * vim: set ts=4 :

 * ================================================================

 * SourceMod

 * Copyright (C) 2004-2007 AlliedModders LLC.  All rights reserved.

 * ================================================================

 *

 * This program is free software; you can redistribute it and/or 

 * modify it under the terms of the GNU General Public License, 

 * version 3.0, 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, see <http://www.gnu.org/licenses/>.

 *

 * As a special exception, AlliedModders LLC gives you permission to 

 * link the code of this program (as well as its derivative works) to 

 * "Half-Life 2," the "Source Engine," the "SourcePawn JIT," and any 

 * Game MODs that run on software by the Valve Corporation.  You must 

 * obey the GNU General Public License in all respects for all other 

 * code used. Additionally, AlliedModders LLC grants this exception 

 * to all derivative works. AlliedModders LLC defines further 

 * exceptions, found in LICENSE.txt (as of this writing, version 

 * JULY-31-2007), or <http://www.sourcemod.net/license.php>.

 *

 * Version: $Id$

 */

#include "TimerSys.h"

TimerSystem g_Timers;

TickInfo g_SimTicks;

inline float GetSimulatedTime()

{

	if (g_SimTicks.ticking)

	{

		return gpGlobals->curtime;

	} else {

		return g_SimTicks.ticktime;

	}

}

void ITimer::Initialize(ITimedEvent *pCallbacks, float fInterval, float fToExec, void *pData, int flags)

{

	m_Listener = pCallbacks;

	m_Interval = fInterval;

	m_ToExec = fToExec;

	m_pData = pData;

	m_Flags = flags;

	m_InExec = false;

	m_KillMe = false;

}

TimerSystem::~TimerSystem()

{

	CStack<ITimer *>::iterator iter;

	for (iter=m_FreeTimers.begin(); iter!=m_FreeTimers.end(); iter++)

	{

		delete (*iter);

	}

	m_FreeTimers.popall();

}

void TimerSystem::OnSourceModAllInitialized()

{

	g_ShareSys.AddInterface(NULL, this);

}

void TimerSystem::OnSourceModLevelChange(const char *mapName)

{

	MapChange(true);

}

void TimerSystem::RunFrame()

{

	ITimer *pTimer;

	TimerIter iter;

	float curtime = GetSimulatedTime();

	for (iter=m_SingleTimers.begin(); iter!=m_SingleTimers.end(); )

	{

		pTimer = (*iter);

		if (curtime >= pTimer->m_ToExec)

		{

			pTimer->m_InExec = true;

			pTimer->m_Listener->OnTimer(pTimer, pTimer->m_pData);

			pTimer->m_Listener->OnTimerEnd(pTimer, pTimer->m_pData);

			iter = m_SingleTimers.erase(iter);

			m_FreeTimers.push(pTimer);

		} else {

			break;

		}

	}

	ResultType res;

	for (iter=m_LoopTimers.begin(); iter!=m_LoopTimers.end(); )

	{

		pTimer = (*iter);

		if (curtime >= pTimer->m_ToExec)

		{

			pTimer->m_InExec = true;

			res = pTimer->m_Listener->OnTimer(pTimer, pTimer->m_pData);

			if (pTimer->m_KillMe || (res == Pl_Stop))

			{

				pTimer->m_Listener->OnTimerEnd(pTimer, pTimer->m_pData);

				iter = m_LoopTimers.erase(iter);

				m_FreeTimers.push(pTimer);

				continue;

			}

			pTimer->m_InExec = false;

			pTimer->m_ToExec = curtime + pTimer->m_Interval;

		}

		iter++;

	}

	m_LastExecTime = curtime;

}

ITimer *TimerSystem::CreateTimer(ITimedEvent *pCallbacks, float fInterval, void *pData, int flags)

{

	ITimer *pTimer;

	TimerIter iter;

	float to_exec = GetSimulatedTime() + fInterval;

	if (m_FreeTimers.empty())

	{

		pTimer = new ITimer;

	} else {

		pTimer = m_FreeTimers.front();

		m_FreeTimers.pop();

	}

	pTimer->Initialize(pCallbacks, fInterval, to_exec, pData, flags);

	if (flags & TIMER_FLAG_REPEAT)

	{

		m_LoopTimers.push_back(pTimer);

		goto return_timer;

	}

	if (m_SingleTimers.size() >= 1)

	{

		iter = --m_SingleTimers.end();

		if ((*iter)->m_ToExec <= to_exec)

		{

			goto insert_end;

		}

	}

	for (iter=m_SingleTimers.begin(); iter!=m_SingleTimers.end(); iter++)

	{

		if ((*iter)->m_ToExec >= to_exec)

		{

			m_SingleTimers.insert(iter, pTimer);

			goto return_timer;

		}

	}

insert_end:

	m_SingleTimers.push_back(pTimer);

return_timer:

	return pTimer;

}

void TimerSystem::FireTimerOnce(ITimer *pTimer, bool delayExec)

{

	ResultType res;

	if (pTimer->m_InExec)

	{

		return;

	}

	pTimer->m_InExec = true;

	res = pTimer->m_Listener->OnTimer(pTimer, pTimer->m_pData);

	if (!(pTimer->m_Flags & TIMER_FLAG_REPEAT))

	{

		pTimer->m_Listener->OnTimerEnd(pTimer, pTimer->m_pData);

		m_SingleTimers.remove(pTimer);

		m_FreeTimers.push(pTimer);

	} else {

		if ((res != Pl_Stop) && !pTimer->m_KillMe)

		{

			if (delayExec)

			{

				pTimer->m_ToExec = GetSimulatedTime() + pTimer->m_Interval;

			}

			pTimer->m_InExec = false;

			return;

		}

		pTimer->m_Listener->OnTimerEnd(pTimer, pTimer->m_pData);

		m_LoopTimers.remove(pTimer);

		m_FreeTimers.push(pTimer);

	}

}

void TimerSystem::KillTimer(ITimer *pTimer)

{

	TimerList *pList;

	if (pTimer->m_KillMe)

	{

		return;

	}

	if (pTimer->m_InExec)

	{

		pTimer->m_KillMe = true;

		return;

	}

	pTimer->m_InExec = true; /* The timer it's not really executed but this check needs to be done */

	pTimer->m_Listener->OnTimerEnd(pTimer, pTimer->m_pData);

	pList = (pTimer->m_Flags & TIMER_FLAG_REPEAT) ? &m_LoopTimers : &m_SingleTimers;

	pList->remove(pTimer);

	m_FreeTimers.push(pTimer);

}

CStack<ITimer *> s_tokill;

void TimerSystem::MapChange(bool real_mapchange)

{

	ITimer *pTimer;

	TimerIter iter;

	for (iter=m_SingleTimers.begin(); iter!=m_SingleTimers.end(); iter++)

	{

		pTimer = (*iter);

		if (real_mapchange && (pTimer->m_Flags & TIMER_FLAG_NO_MAPCHANGE))

		{

			s_tokill.push(pTimer);

		} else {

			pTimer->m_ToExec = pTimer->m_ToExec - m_LastExecTime + GetSimulatedTime();

		}

	}

	for (iter=m_LoopTimers.begin(); iter!=m_LoopTimers.end(); iter++)

	{

		pTimer = (*iter);

		if (real_mapchange && (pTimer->m_Flags & TIMER_FLAG_NO_MAPCHANGE))

		{

			s_tokill.push(pTimer);

		} else {

			pTimer->m_ToExec = pTimer->m_ToExec - m_LastExecTime + GetSimulatedTime();

		}

	}

	while (!s_tokill.empty())

	{

		KillTimer(s_tokill.front());

		s_tokill.pop();

	}

	m_LastExecTime = GetSimulatedTime();

}