/**

 * 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 <stdio.h>

#include "sourcemod.h"

#include "sourcemm_api.h"

#include "systems/LibrarySys.h"

#include "vm/sp_vm_engine.h"

#include <sh_string.h>

#include "PluginSys.h"

#include "ShareSys.h"

#include "CoreConfig.h"

#include "Logger.h"

#include "ExtensionSys.h"

#include "AdminCache.h"

#include "sm_stringutil.h"

#include "PlayerManager.h"

#include "Translator.h"

#include "ForwardSys.h"

#include "TimerSys.h"

#include "MenuStyle_Valve.h"

#include "MenuStyle_Radio.h"

#include "Database.h"

#include "HalfLife2.h"

SH_DECL_HOOK6(IServerGameDLL, LevelInit, SH_NOATTRIB, false, bool, const char *, const char *, const char *, const char *, bool, bool);

SH_DECL_HOOK0_void(IServerGameDLL, LevelShutdown, SH_NOATTRIB, false);

SH_DECL_HOOK1_void(IServerGameDLL, GameFrame, SH_NOATTRIB, false, bool);

SH_DECL_HOOK1_void(IVEngineServer, ServerCommand, SH_NOATTRIB, false, const char *);

SourcePawnEngine g_SourcePawn;

SourceModBase g_SourceMod;

ILibrary *g_pJIT = NULL;

SourceHook::String g_BaseDir;

ISourcePawnEngine *g_pSourcePawn = &g_SourcePawn;

IVirtualMachine *g_pVM;

IdentityToken_t *g_pCoreIdent = NULL;

float g_LastTime = 0.0f;

float g_LastMenuTime = 0.0f;

float g_LastAuthCheck = 0.0f;

IForward *g_pOnGameFrame = NULL;

IForward *g_pOnMapEnd = NULL;

bool g_Loaded = false;

int g_StillFrames = 0;

float g_StillTime = 0.0f;

typedef int (*GIVEENGINEPOINTER)(ISourcePawnEngine *);

typedef int (*GIVEENGINEPOINTER2)(ISourcePawnEngine *, unsigned int api_version);

typedef unsigned int (*GETEXPORTCOUNT)();

typedef IVirtualMachine *(*GETEXPORT)(unsigned int);

typedef void (*NOTIFYSHUTDOWN)();

void ShutdownJIT()

{

	NOTIFYSHUTDOWN notify = (NOTIFYSHUTDOWN)g_pJIT->GetSymbolAddress("NotifyShutdown");

	if (notify)

	{

		notify();

	}

	g_pJIT->CloseLibrary();

}

SourceModBase::SourceModBase()

{

	m_IsMapLoading = false;

	m_ExecPluginReload = false;

	m_ExecOnMapEnd = false;

	m_GotBasePath = false;

}

ConfigResult SourceModBase::OnSourceModConfigChanged(const char *key, 

									  const char *value, 

									  ConfigSource source, 

									  char *error, 

									  size_t maxlength)

{

	if (strcasecmp(key, "BasePath") == 0)

	{

		if (source == ConfigSource_Console)

		{

			UTIL_Format(error, maxlength, "Cannot be set at runtime");

			return ConfigResult_Reject;

		}

		if (!m_GotBasePath)

		{

			g_LibSys.PathFormat(m_SMBaseDir, sizeof(m_SMBaseDir), "%s/%s", g_BaseDir.c_str(), value);

			g_LibSys.PathFormat(m_SMRelDir, sizeof(m_SMRelDir), value);

			m_GotBasePath = true;

		}

		return ConfigResult_Accept;

	}

	return ConfigResult_Ignore;

}

bool SourceModBase::InitializeSourceMod(char *error, size_t maxlength, bool late)

{

	const char *gamepath = g_SMAPI->GetBaseDir();

	/* Store full path to game */

	g_BaseDir.assign(gamepath);

	/* Store name of game directory by itself */

	size_t len = strlen(gamepath);

	for (size_t i = len - 1; i >= 0; i--)

	{

		if (gamepath[i] == PLATFORM_SEP_CHAR)

		{

			strncopy(m_ModDir, &gamepath[++i], sizeof(m_ModDir));

			break;

		}

	}

	/* Initialize CoreConfig so we can get SourceMod base path properly - this basically parses core.cfg */

	g_CoreConfig.Initialize();

	/* This shouldn't happen, but can't hurt to be safe */

	if (!g_LibSys.PathExists(m_SMBaseDir) || !m_GotBasePath)

	{

		g_LibSys.PathFormat(m_SMBaseDir, sizeof(m_SMBaseDir), "%s/addons/sourcemod", g_BaseDir.c_str());

		g_LibSys.PathFormat(m_SMRelDir, sizeof(m_SMRelDir), "addons/sourcemod");

		m_GotBasePath = true;

	}

	/* Attempt to load the JIT! */

	char file[PLATFORM_MAX_PATH];

	char myerror[255];

	g_SMAPI->PathFormat(file, sizeof(file), "%s/bin/sourcepawn.jit.x86.%s",

		GetSourceModPath(),

		PLATFORM_LIB_EXT

		);

	g_pJIT = g_LibSys.OpenLibrary(file, myerror, sizeof(myerror));

	if (!g_pJIT)

	{

		if (error && maxlength)

		{

			snprintf(error, maxlength, "%s (failed to load bin/sourcepawn.jit.x86.%s)", 

				myerror,

				PLATFORM_LIB_EXT);

		}

		return false;

	}

	int err;

	GIVEENGINEPOINTER2 jit_init2 = (GIVEENGINEPOINTER2)g_pJIT->GetSymbolAddress("GiveEnginePointer2");

	if (!jit_init2)

	{

		GIVEENGINEPOINTER jit_init = (GIVEENGINEPOINTER)g_pJIT->GetSymbolAddress("GiveEnginePointer");

		if (!jit_init)

		{

			ShutdownJIT();

			if (error && maxlength)

			{

				snprintf(error, maxlength, "Failed to find GiveEnginePointer in JIT!");

			}

			return false;

		}

		if ((err=jit_init(g_pSourcePawn)) != 0)

		{

			ShutdownJIT();

			if (error && maxlength)

			{

				snprintf(error, maxlength, "GiveEnginePointer returned %d in the JIT", err);

			}

			return false;

		}

	} else {

		/* On version bumps, we should check for older versions as well, if the new version fails.

		 * We can then check the exports to see if any VM versions will be sufficient.

		 */

		if ((err=jit_init2(g_pSourcePawn, SOURCEPAWN_ENGINE_API_VERSION)) != SP_ERROR_NONE)

		{

			ShutdownJIT();

			if (error && maxlength)

			{

				snprintf(error, maxlength, "JIT incompatible with SourceMod version");

			}

			return false;

		}

	}

	GETEXPORTCOUNT jit_getnum = (GETEXPORTCOUNT)g_pJIT->GetSymbolAddress("GetExportCount");

	GETEXPORT jit_get = (GETEXPORT)g_pJIT->GetSymbolAddress("GetExport");

	if (!jit_get)

	{

		ShutdownJIT();

		if (error && maxlength)

		{

			snprintf(error, maxlength, "JIT is missing a necessary export!");

		}

		return false;

	}

	unsigned int num = jit_getnum();

	if (!num)

	{

		ShutdownJIT();

		if (error && maxlength)

		{

			snprintf(error, maxlength, "JIT did not export any virtual machines!");

		}

		return false;

	}

	unsigned int api_version;

	for (unsigned int i=0; i<num; i++)

	{

		 if ((g_pVM=jit_get(i)) == NULL)

		 {

			 if (error && maxlength)

			 {

				 snprintf(error, maxlength, "JIT did not export any virtual machines!");

			 }

			 continue;

		 }

		/* Refuse any API that we might not be able to deal with.

		 * Also refuse anything < 3 because we need fake natives.

		 */

		 api_version = g_pVM->GetAPIVersion();

		 if (api_version < 3 || api_version > SOURCEPAWN_VM_API_VERSION)

		 {

			 if (error && maxlength)

			 {

				 snprintf(error, maxlength, "JIT is not a compatible version");

			 }

			 g_pVM = NULL;

			 continue;

		 }

		 break;

	}

	if (!g_pVM)

	{

		ShutdownJIT();

		return false;

	}

	/* Hook this now so we can detect startup without calling StartSourceMod() */

	SH_ADD_HOOK_MEMFUNC(IServerGameDLL, LevelInit, gamedll, this, &SourceModBase::LevelInit, false);

	/* Only load if we're not late */

	if (!late)

	{

		StartSourceMod(false);

	}

	return true;

}

void SourceModBase::StartSourceMod(bool late)

{

	SH_ADD_HOOK_MEMFUNC(IServerGameDLL, LevelShutdown, gamedll, this, &SourceModBase::LevelShutdown, false);

	SH_ADD_HOOK_MEMFUNC(IServerGameDLL, GameFrame, gamedll, this, &SourceModBase::GameFrame, false);

	enginePatch = SH_GET_CALLCLASS(engine);

	gamedllPatch = SH_GET_CALLCLASS(gamedll);

	/* Notify! */

	SMGlobalClass *pBase = SMGlobalClass::head;

	while (pBase)

	{

		pBase->OnSourceModStartup(false);

		pBase = pBase->m_pGlobalClassNext;

	}

	/* Make the global core identity */

	g_pCoreIdent = g_ShareSys.CreateCoreIdentity();

	/* Notify! */

	pBase = SMGlobalClass::head;

	while (pBase)

	{

		pBase->OnSourceModAllInitialized();

		pBase = pBase->m_pGlobalClassNext;

	}

	/* Add us now... */

	g_ShareSys.AddInterface(NULL, this);

	/* We're loaded! */

	g_Loaded = true;

}

static bool g_LevelEndBarrier = false;

bool SourceModBase::LevelInit(char const *pMapName, char const *pMapEntities, char const *pOldLevel, char const *pLandmarkName, bool loadGame, bool background)

{

	/* If we're not loaded... */

	if (!g_Loaded)

	{

		/* Do all global initialization now */

		StartSourceMod(true);

	}

	m_IsMapLoading = true;

	m_ExecPluginReload = true;

	m_ExecOnMapEnd = true;

	g_LastTime = 0.0f;

	g_LastMenuTime = 0.0f;

	g_LastAuthCheck = 0.0f;

	g_SimTicks.ticking = true;

	g_SimTicks.tickcount = 0;

	g_StillTime = 0.0f;

	g_StillFrames = 0;

	/* Notify! */

	SMGlobalClass *pBase = SMGlobalClass::head;

	while (pBase)

	{

		pBase->OnSourceModLevelChange(pMapName);

		pBase = pBase->m_pGlobalClassNext;

	}

	DoGlobalPluginLoads();

	m_IsMapLoading = false;

	/* Notify! */

	pBase = SMGlobalClass::head;

	while (pBase)

	{

		pBase->OnSourceModPluginsLoaded();

		pBase = pBase->m_pGlobalClassNext;

	}

	if (!g_pOnGameFrame)

	{

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

	}

	if (!g_pOnMapEnd)

	{

		g_pOnMapEnd = g_Forwards.CreateForward("OnMapEnd", ET_Ignore, 0, NULL);

	}

	g_LevelEndBarrier = true;

	RETURN_META_VALUE(MRES_IGNORED, true);

}

void StartTickSimulation()

{

	g_SimTicks.ticking = false;

	g_SimTicks.tickcount = 0;

	g_SimTicks.ticktime = gpGlobals->curtime;

}

void StopTickSimulation()

{

	g_SimTicks.ticking = true;

	g_Timers.MapChange(false);

	g_StillFrames = 0;

	g_LastTime = gpGlobals->curtime;

}

void SimulateTick()

{

	g_SimTicks.tickcount++;

	g_SimTicks.ticktime = g_StillTime + (g_SimTicks.tickcount * gpGlobals->interval_per_tick);

}

void SourceModBase::GameFrame(bool simulating)

{

	g_DBMan.RunFrame();

	g_HL2.ProcessFakeCliCmdQueue();

	/**

	 * Note: This is all hardcoded rather than delegated to save

	 * precious CPU cycles.

	 */

	float curtime = gpGlobals->curtime;

	int framecount = gpGlobals->framecount;

	/* Verify that we're still ticking */

	if (g_SimTicks.ticking)

	{

		if (g_StillFrames == 0)

		{

			g_StillFrames = framecount;

			g_StillTime = curtime;

		} else {

			/* Try to detect when we've stopped ticking.

			 * We do this once 10 frames pass and there have been no ticks.

			 */

			if (g_StillTime == curtime)

			{

				if (framecount - g_StillFrames >= 5)

				{

					StartTickSimulation();

					return;

				}

			} else {

				/* We're definitely ticking we get here, 

				 * but update everything as a precaution */

				g_StillFrames = framecount;

				g_StillTime = curtime;

			}

		}

	} else {

		/* We need to make sure we should still be simulating. */

		if (g_StillTime != curtime)

		{

			/* Wow, we're ticking again! It's time to revert. */

			StopTickSimulation();

			return;

		}

		/* Nope, not ticking.  Simulate! */

		SimulateTick();

		curtime = g_SimTicks.ticktime;

	}

	if (curtime - g_LastTime >= 0.1f)

	{

		if (m_CheckingAuth

			&& (gpGlobals->curtime - g_LastAuthCheck > 0.7f))

		{

			g_LastAuthCheck = gpGlobals->curtime;

			g_Players.RunAuthChecks();

		}

		g_Timers.RunFrame();

		g_LastTime = curtime;

	}

	if (g_SimTicks.ticking && curtime - g_LastMenuTime >= 1.0f)

	{

		g_ValveMenuStyle.ProcessWatchList();

		g_RadioMenuStyle.ProcessWatchList();

		g_LastMenuTime = curtime;

	}

	if (g_pOnGameFrame && g_pOnGameFrame->GetFunctionCount())

	{

		g_pOnGameFrame->Execute(NULL);

	}

}

void SourceModBase::LevelShutdown()

{

	if (g_LevelEndBarrier)

	{

		SMGlobalClass *next = SMGlobalClass::head;

		while (next)

		{

			next->OnSourceModLevelEnd();

			next = next->m_pGlobalClassNext;

		}

		g_LevelEndBarrier = false;

	}

	if (g_pOnMapEnd && m_ExecOnMapEnd)

	{

		g_pOnMapEnd->Execute(NULL);

		m_ExecOnMapEnd = false;

	}

	g_OnMapStarted = false;

	if (m_ExecPluginReload)

	{

		g_PluginSys.ReloadOrUnloadPlugins();

		m_ExecPluginReload = false;

	}

}

bool SourceModBase::IsMapLoading() const

{

	return m_IsMapLoading;

}

void SourceModBase::DoGlobalPluginLoads()

{

	char config_path[PLATFORM_MAX_PATH];

	char plugins_path[PLATFORM_MAX_PATH];

	BuildPath(Path_SM, config_path, 

		sizeof(config_path),

		"configs/plugin_settings.cfg");

	BuildPath(Path_SM, plugins_path,

		sizeof(plugins_path),

		"plugins");

	/* Load any auto extensions */

	g_Extensions.TryAutoload();

	/* Run the first pass */

	g_PluginSys.LoadAll_FirstPass(config_path, plugins_path);

	/* Mark any extensions as loaded */

	g_Extensions.MarkAllLoaded();

	/* No modules yet, it's safe to call this from here */

	g_PluginSys.LoadAll_SecondPass();

	/* Re-mark any extensions as loaded */

	g_Extensions.MarkAllLoaded();

	/* Call OnAllPluginsLoaded */

	g_PluginSys.AllPluginsLoaded();

}

size_t SourceModBase::BuildPath(PathType type, char *buffer, size_t maxlength, char *format, ...)

{

	char _buffer[PLATFORM_MAX_PATH];

	va_list ap;

	va_start(ap, format);

	vsnprintf(_buffer, PLATFORM_MAX_PATH, format, ap);

	va_end(ap);

	const char *base = NULL;

	if (type == Path_Game)

	{

		base = GetGamePath();

	} else if (type == Path_SM) {

		base = GetSourceModPath();

	} else if (type == Path_SM_Rel) {

		base = m_SMRelDir;

	}

	if (base)

	{

		return g_LibSys.PathFormat(buffer, maxlength, "%s/%s", base, _buffer);

	} else {

		return g_LibSys.PathFormat(buffer, maxlength, "%s", _buffer);

	}

}

void SourceModBase::CloseSourceMod()

{

	/* Force a level end */

	LevelShutdown();

	/* Unload plugins */

	g_PluginSys.Shutdown();

	/* Unload extensions */

	g_Extensions.Shutdown();

	SH_REMOVE_HOOK_MEMFUNC(IServerGameDLL, LevelInit, gamedll, this, &SourceModBase::LevelInit, false);

	if (g_Loaded)

	{

		if (g_pOnGameFrame)

		{

			g_Forwards.ReleaseForward(g_pOnGameFrame);

		}

		if (g_pOnMapEnd)

		{

			g_Forwards.ReleaseForward(g_pOnMapEnd);

		}

		/* Notify! */

		SMGlobalClass *pBase = SMGlobalClass::head;

		while (pBase)

		{

			pBase->OnSourceModShutdown();

			pBase = pBase->m_pGlobalClassNext;

		}

		/* Delete all data packs */

		CStack<CDataPack *>::iterator iter;

		CDataPack *pd;

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

		{

			pd = (*iter);

			delete pd;

		}

		m_freepacks.popall();

		/* Notify! */

		pBase = SMGlobalClass::head;

		while (pBase)

		{

			pBase->OnSourceModAllShutdown();

			pBase = pBase->m_pGlobalClassNext;