/**

 * vim: set ts=4 sw=4 tw=99 noet:

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

 * SourceMod

 * Copyright (C) 2004-2010 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 "LibrarySys.h"

#include <sh_string.h>

#include "CoreConfig.h"

#include "Logger.h"

#include "AdminCache.h"

#include "sm_stringutil.h"

#include "PlayerManager.h"

#include "TimerSys.h"

#include <IGameConfigs.h>

#include "frame_hooks.h"

#include "logic_bridge.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 *);

SourceModBase g_SourceMod;

ILibrary *g_pJIT = NULL;

SourceHook::String g_BaseDir;

ISourcePawnEngine *g_pSourcePawn = NULL;

ISourcePawnEngine2 *g_pSourcePawn2 = NULL;

IdentityToken_t *g_pCoreIdent = NULL;

IForward *g_pOnMapEnd = NULL;

IGameConfig *g_pGameConf = NULL;

bool g_Loaded = false;

bool sm_show_debug_spew = false;

bool sm_disable_jit = false;

typedef ISourcePawnEngine *(*GET_SP_V1)();

typedef ISourcePawnEngine2 *(*GET_SP_V2)();

typedef void (*NOTIFYSHUTDOWN)();

#ifdef PLATFORM_WINDOWS

ConVar sm_basepath("sm_basepath", "addons\\sourcemod", 0, "SourceMod base path (set via command line)");

#elif defined PLATFORM_LINUX || defined PLATFORM_APPLE

ConVar sm_basepath("sm_basepath", "addons/sourcemod", 0, "SourceMod base path (set via command line)");

#endif

void ShutdownJIT()

{

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

	if (notify)

	{

		notify();

	}

	if (g_pSourcePawn2 != NULL)

	{

		g_pSourcePawn2->Shutdown();

	}

	g_pJIT->CloseLibrary();

}

SourceModBase::SourceModBase()

{

	m_IsMapLoading = false;

	m_ExecPluginReload = 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;

	}

	else if (strcasecmp(key, "DebugSpew") == 0)

	{

		sm_show_debug_spew = (strcasecmp(value, "yes") == 0) ? true : false;

		return ConfigResult_Accept;

	}

	else if (strcasecmp(key, "DisableJIT") == 0)

	{

		sm_disable_jit = (strcasecmp(value, "yes") == 0) ? true : false;

		if (g_pSourcePawn2)

			g_pSourcePawn2->SetJitEnabled(!sm_disable_jit);

		return ConfigResult_Accept;

	}

	return ConfigResult_Ignore;

}

static bool sSourceModInitialized = false;

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 < len; i--)

	{

		if (gamepath[i] == PLATFORM_SEP_CHAR)

		{

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

			break;

		}

	}

	const char *basepath = icvar->GetCommandLineValue("sm_basepath");

	/* Set a custom base path if there is one. */

	if (basepath != NULL && basepath[0] != '\0')

	{

		m_GotBasePath = true;

	}

	/* Otherwise, use a default and keep the m_GotBasePath unlocked. */

	else

	{

		basepath = sm_basepath.GetDefault();

	}

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

	g_LibSys.PathFormat(m_SMRelDir, sizeof(m_SMRelDir), "%s", basepath);

	if (!StartLogicBridge(error, maxlength))

	{

		return false;

	}

	/* Initialize CoreConfig to get the SourceMod base path properly - this parses core.cfg */

	g_CoreConfig.Initialize();

	/* There will always be a path by this point, since it was force-set above. */

	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)

		{

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

				myerror,

				PLATFORM_LIB_EXT);

		}

		return false;

	}

	GET_SP_V1 getv1 = (GET_SP_V1)g_pJIT->GetSymbolAddress("GetSourcePawnEngine1");

	GET_SP_V2 getv2 = (GET_SP_V2)g_pJIT->GetSymbolAddress("GetSourcePawnEngine2");

	if (getv1 == NULL)

	{

		if (error && maxlength)

		{

			snprintf(error, maxlength, "JIT is too old; upgrade SourceMod");

		}

		ShutdownJIT();

		return false;

	}

	else if (getv2 == NULL)

	{

		if (error && maxlength)

		{

			snprintf(error, maxlength, "JIT is too old; upgrade SourceMod");

		}

		ShutdownJIT();

		return false;

	}

	g_pSourcePawn = getv1();

	g_pSourcePawn2 = getv2();

	if (g_pSourcePawn2->GetAPIVersion() < 3)

	{

		g_pSourcePawn2 = NULL;

		if (error && maxlength)

		{

			snprintf(error, maxlength, "JIT version is out of date");

		}

		return false;

	}

	if (!g_pSourcePawn2->Initialize())

	{

		g_pSourcePawn2 = NULL;

		if (error && maxlength)

		{

			snprintf(error, maxlength, "JIT could not be initialized");

		}

		return false;

	}

	g_pSourcePawn2->SetDebugListener(logicore.debugger);

	if (sm_disable_jit)

		g_pSourcePawn2->SetJitEnabled(!sm_disable_jit);

	sSourceModInitialized = true;

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

	SH_ADD_HOOK(IServerGameDLL, LevelInit, gamedll, SH_MEMBER(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(IServerGameDLL, LevelShutdown, gamedll, SH_MEMBER(this, &SourceModBase::LevelShutdown), false);

	SH_ADD_HOOK(IServerGameDLL, GameFrame, gamedll, SH_MEMBER(&g_Timers, &TimerSystem::GameFrame), false);

	enginePatch = SH_GET_CALLCLASS(engine);

	gamedllPatch = SH_GET_CALLCLASS(gamedll);

	InitLogicBridge();

	/* Notify! */

	SMGlobalClass *pBase = SMGlobalClass::head;

	while (pBase)

	{

		pBase->OnSourceModStartup(false);

		pBase = pBase->m_pGlobalClassNext;

	}

	g_pGameConf = logicore.GetCoreGameConfig();

	/* Notify! */

	pBase = SMGlobalClass::head;

	while (pBase)

	{

		pBase->OnSourceModAllInitialized();

		pBase = pBase->m_pGlobalClassNext;

	}

	/* Notify! */

	pBase = SMGlobalClass::head;

	while (pBase)

	{

		pBase->OnSourceModAllInitialized_Post();

		pBase = pBase->m_pGlobalClassNext;

	}

	/* Add us now... */

	sharesys->AddInterface(NULL, this);

	/* We're loaded! */

	g_Loaded = true;

	/* Initialize VSP stuff */

	if (vsp_interface != NULL)

	{

		g_SourceMod_Core.OnVSPListening(vsp_interface);

	}

	if (late)

	{

		/* We missed doing anythin gin this if we late-loaded. Sneak it in now. */

		AllPluginsLoaded();

	}

	/* If we want to autoload, do that now */

	const char *disabled = GetCoreConfigValue("DisableAutoUpdate");

	if (disabled == NULL || strcasecmp(disabled, "yes") != 0)

	{

		extsys->LoadAutoExtension("updater.ext." PLATFORM_LIB_EXT);

	}

	const char *timeout = GetCoreConfigValue("SlowScriptTimeout");

	if (timeout == NULL)

	{

		timeout = "8";

	}

	if (atoi(timeout) != 0)

	{

		g_pSourcePawn2->InstallWatchdogTimer(atoi(timeout) * 1000);

	}

}

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;

	/* 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_pOnMapEnd)

	{

		g_pOnMapEnd = forwardsys->CreateForward("OnMapEnd", ET_Ignore, 0, NULL);

	}

	g_LevelEndBarrier = true;

	RETURN_META_VALUE(MRES_IGNORED, true);

}

void SourceModBase::LevelShutdown()

{

	if (g_LevelEndBarrier)

	{

		SMGlobalClass *next = SMGlobalClass::head;

		while (next)

		{

			next->OnSourceModLevelEnd();

			next = next->m_pGlobalClassNext;

		}

		if (g_pOnMapEnd != NULL)

		{

			g_pOnMapEnd->Execute(NULL);

		}

		g_Timers.RemoveMapChangeTimers();

		g_LevelEndBarrier = false;

	}

	g_OnMapStarted = false;

	if (m_ExecPluginReload)

	{

		scripts->RefreshAll();

		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 */

	extsys->TryAutoload();

	/* Fire the extensions ready message */

	g_SMAPI->MetaFactory(SOURCEMOD_NOTICE_EXTENSIONS, NULL, NULL);

	/* Load any game extension */

	const char *game_ext;

	if ((game_ext = g_pGameConf->GetKeyValue("GameExtension")) != NULL)

	{

		char path[PLATFORM_MAX_PATH];

		UTIL_Format(path, sizeof(path), "%s.ext." PLATFORM_LIB_EXT, game_ext);

		extsys->LoadAutoExtension(path);

	}

	scripts->LoadAll(config_path, plugins_path);

}

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

{

	char _buffer[PLATFORM_MAX_PATH];

	va_list ap;

	va_start(ap, format);

	vsnprintf(_buffer, PLATFORM_MAX_PATH, format, ap);

	va_end(ap);

	/* If we get a "file://" notation, strip off the file:// part so we're left 

	 * with an absolute path.  Note that the absolute path gets returned, so 

	 * usage with relative paths here is completely invalid.

	 */

	if (type != Path_SM_Rel && strncmp(_buffer, "file://", 7) == 0)

	{

		return g_LibSys.PathFormat(buffer, maxlength, "%s", &_buffer[7]);

	}

	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()

{

	if (!sSourceModInitialized)

		return;

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

	if (g_Loaded)

	{

		/* Force a level end */

		LevelShutdown();

		ShutdownServices();

	}

	/* Rest In Peace */

	ShutdownLogicBridge();

	ShutdownJIT();

}

void SourceModBase::ShutdownServices()

{

	/* Unload plugins */

	scripts->Shutdown();

	/* Unload extensions */

	extsys->Shutdown();

	if (g_pOnMapEnd)

		forwardsys->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;

	}

	if (enginePatch)

	{

		SH_RELEASE_CALLCLASS(enginePatch);

		enginePatch = NULL;

	}

	if (gamedllPatch)

	{

		SH_RELEASE_CALLCLASS(gamedllPatch);

		gamedllPatch = NULL;

	}

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

	SH_REMOVE_HOOK(IServerGameDLL, GameFrame, gamedll, SH_MEMBER(&g_Timers, &TimerSystem::GameFrame), false);

}

void SourceModBase::LogMessage(IExtension *pExt, const char *format, ...)

{

	IExtensionInterface *pAPI = pExt->GetAPI();

	const char *tag = pAPI->GetExtensionTag();

	char buffer[2048];

	va_list ap;

	va_start(ap, format);

	vsnprintf(buffer, sizeof(buffer), format, ap);

	va_end(ap);

	if (tag)

	{

		g_Logger.LogMessage("[%s] %s", tag, buffer);

	} else {

		g_Logger.LogMessage("%s", buffer);

	}

}

void SourceModBase::LogError(IExtension *pExt, const char *format, ...)

{

	IExtensionInterface *pAPI = pExt->GetAPI();

	const char *tag = pAPI->GetExtensionTag();

	char buffer[2048];

	va_list ap;

	va_start(ap, format);

	vsnprintf(buffer, sizeof(buffer), format, ap);

	va_end(ap);

	if (tag)

	{

		g_Logger.LogError("[%s] %s", tag, buffer);

	} else {

		g_Logger.LogError("%s", buffer);

	}

}

size_t SourceModBase::FormatString(char *buffer, size_t maxlength, IPluginContext *pContext, const cell_t *params, unsigned int param)