/**

 * 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 <time.h>

#include "TimerSys.h"

#include "ForwardSys.h"

#include "sourcemm_api.h"

#include "frame_hooks.h"

TimerSystem g_Timers;

float g_fUniversalTime = 0.0f;

const float *g_pUniversalTime = &g_fUniversalTime;

ConVar sm_time_adjustment("sm_time_adjustment", "0", 0, "Adjusts the server time in seconds");

inline float GetSimulatedTime()

{

	return g_fUniversalTime;

}

time_t GetAdjustedTime(time_t *buf)

{

	time_t val = time(NULL) + sm_time_adjustment.GetInt();

	if (buf)

	{

		*buf = val;

	}

	return val;

}

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()

{

	m_fnTimeLeft = NULL;

	m_bHasMapTickedYet = false;

	m_fLastTickedTime = 0.0f;

	m_LastExecTime = 0.0f;

}

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);

	m_pOnGameFrame = g_Forwards.CreateForward("OnGameFrame", ET_Ignore, 0, NULL);

}

void TimerSystem::OnSourceModShutdown()

{

	g_Forwards.ReleaseForward(m_pOnGameFrame);

}

void TimerSystem::OnSourceModLevelChange(const char *mapName)

{

	MapChange(true);

}

void TimerSystem::OnSourceModLevelEnd()

{

	m_bHasMapTickedYet = false;

}

void TimerSystem::GameFrame(bool simulating)

{

	if (simulating && m_bHasMapTickedYet)

	{

		g_fUniversalTime += gpGlobals->curtime - m_fLastTickedTime;

	}

	else 

	{

		g_fUniversalTime += gpGlobals->interval_per_tick;

	}

	m_fLastTickedTime = gpGlobals->curtime;

	m_bHasMapTickedYet = true;

	if (g_fUniversalTime - m_LastExecTime >= 0.1)

	{

		RunFrame();

	}

	RunFrameHooks();

	if (m_pOnGameFrame->GetFunctionCount())

	{

		m_pOnGameFrame->Execute(NULL);

	}

}

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;

		}

	}

	if (m_fnTimeLeft != NULL && m_MapEndTimers.size())

	{

		float time_left = m_fnTimeLeft();

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

		{

			pTimer = (*iter);

			if ((*iter)->m_Interval < time_left)

			{

				pTimer->m_InExec = true;

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

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

				iter = m_MapEndTimers.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 ((flags & TIMER_FLAG_BEFORE_MAP_END)

		&& m_fnTimeLeft == NULL)

	{

		return NULL;

	}

	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 (flags & TIMER_FLAG_BEFORE_MAP_END)

	{

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

		{

			if (fInterval >= (*iter)->m_Interval)

			{

				m_MapEndTimers.insert(iter, pTimer);

				goto return_timer;

			}

		}

		m_MapEndTimers.push_back(pTimer);

	} else {

		if (m_SingleTimers.size() >= 1)

		{

			iter = --m_SingleTimers.end();

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

			{

				goto normal_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;

			}

		}

normal_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);

		if (pTimer->m_Flags & TIMER_FLAG_BEFORE_MAP_END)

		{

			m_MapEndTimers.remove(pTimer);

		} else {

			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)

{

	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);

	if (pTimer->m_Flags & TIMER_FLAG_REPEAT)

	{

		m_LoopTimers.remove(pTimer);

	} else if (pTimer->m_Flags & TIMER_FLAG_BEFORE_MAP_END) {

		m_MapEndTimers.remove(pTimer);

	} else {

		m_SingleTimers.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);

		}

	}

	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);

		}

	}

	if (real_mapchange)

	{

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

		{

			pTimer = (*iter);

			s_tokill.push(pTimer);

		}

	}

	while (!s_tokill.empty())

	{

		KillTimer(s_tokill.front());

		s_tokill.pop();

	}

}

SM_TIMELEFT_FUNCTION TimerSystem::SetTimeLeftFunction(SM_TIMELEFT_FUNCTION fn)

{

	SM_TIMELEFT_FUNCTION old = m_fnTimeLeft;

	m_fnTimeLeft = fn;

	return old;

}