/**

 * vim: set ts=4 :

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

 * SourceMod Updater Extension

 * Copyright (C) 2004-2009 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 <sourcemod_version.h>

#include <stdio.h>

#include <stdarg.h>

#include <string.h>

#include <stdlib.h>

#include "extension.h"

#include "Updater.h"

#include <sh_list.h>

#include <sh_string.h>

#define DEFAULT_UPDATE_URL			"http://www.sourcemod.net/update/"

using namespace SourceHook;

SmUpdater g_Updater;		/**< Global singleton for extension's main interface */

SMEXT_LINK(&g_Updater);

IWebternet *webternet;

static List<String *> update_errors;

static IThreadHandle *update_thread;

static String update_url;

bool SmUpdater::SDK_OnLoad(char *error, size_t maxlength, bool late)

{

	sharesys->AddDependency(myself, "webternet.ext", true, true);

	SM_GET_IFACE(WEBTERNET, webternet);

	const char *url = smutils->GetCoreConfigValue("AutoUpdateURL");

	if (url == NULL)

	{

		url = DEFAULT_UPDATE_URL;

	}

	update_url.assign(url);

	ThreadParams params;

	params.flags = Thread_Default;

	params.prio = ThreadPrio_Low;

	update_thread = threader->MakeThread(this, &params);

	if (update_thread == NULL)

	{

		smutils->Format(error, maxlength, "Could not create thread");

		return false;

	}

	return true;

}

void SmUpdater::SDK_OnUnload()

{

	/* An interface drop might have killed this thread.  

	 * But if the handle is still there, we have to wait.

	 */

	if (update_thread != NULL)

	{

		update_thread->WaitForThread();

		update_thread->DestroyThis();

	}

	/* Clear message tables */

	List<String *>::iterator iter = update_errors.begin();

	while (iter != update_errors.end())

	{

		iter = update_errors.erase(iter);

	}

}

bool SmUpdater::QueryInterfaceDrop(SourceMod::SMInterface *pInterface)

{

	if (pInterface == webternet)

	{

		return false;

	}

	return true;

}

void SmUpdater::NotifyInterfaceDrop(SMInterface *pInterface)

{

	if (pInterface == webternet)

	{

		/* Can't be in the thread if we're losing this extension. */

		update_thread->WaitForThread();

		update_thread->DestroyThis();

		update_thread = NULL;

	}

}

static void PumpUpdate(void *data)

{

	String *str;

	bool new_files = false;

	List<String *>::iterator iter;

	char path[PLATFORM_MAX_PATH];

	UpdatePart *temp;

	UpdatePart *part = (UpdatePart*)data;

	while (part != NULL)

	{

		if (strstr(part->file, "..") != NULL)

		{

			/* Naughty naughty */

			AddUpdateError("Detected invalid path escape (..): %s", part->file);

			goto skip_create;

		}

		if (part->data == NULL)

		{

			smutils->BuildPath(Path_SM, path, sizeof(path), "gamedata/%s", part->file);

			if (libsys->IsPathDirectory(path))

			{

				goto skip_create;

			}

			if (!libsys->CreateFolder(path))

			{

				AddUpdateError("Could not create folder: %s", path);

			}

			else

			{

				smutils->LogMessage(myself, "Created folder \"%s\" from updater", path);

			}

		}

		else

		{

			smutils->BuildPath(Path_SM, path, sizeof(path), "gamedata/%s", part->file);

			FILE *fp = fopen(path, "wb");

			if (fp == NULL)

			{

				AddUpdateError("Could not open %s for writing", path);

				goto skip_create;

			}

			if (fwrite(part->data, 1, part->length, fp) != part->length)

			{

				AddUpdateError("Could not write file %s", path);

			}

			else

			{

				smutils->LogMessage(myself,

					"Successfully updated gamedata file \"%s\"",

					part->file);

				new_files = true;

			}

			fclose(fp);

		}

skip_create:

		temp = part->next;

		free(part->data);

		free(part->file);

		delete part;

		part = temp;

	}

	if (update_errors.size())

	{

		smutils->LogError(myself, "--- BEGIN ERRORS FROM AUTOMATIC UPDATER ---");

		for (iter = update_errors.begin();

			 iter != update_errors.end();

			 iter++)

		{

			str = (*iter);

			smutils->LogError(myself, "%s", str->c_str());

		}

		smutils->LogError(myself, "--- END ERRORS FROM AUTOMATIC UPDATER ---");

	}

	if (new_files)

	{

		const char *force_restart = smutils->GetCoreConfigValue("ForceRestartAfterUpdate");

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

		{

			smutils->LogMessage(myself,

				"SourceMod has been updated, please reload it or restart your server.");

		}

		else

		{

			char buffer[255];

			smutils->Format(buffer,

				sizeof(buffer),

				"meta unload %d\n",

				smutils->GetPluginId());

			gamehelpers->ServerCommand(buffer);

			smutils->Format(buffer,

				sizeof(buffer),

				"changelevel \"%s\"\n",

				gamehelpers->GetCurrentMap());

			gamehelpers->ServerCommand(buffer);

			gamehelpers->ServerCommand("echo SourceMod has been restarted from an automatic update.\n");

		}

	}

}

void SmUpdater::RunThread(IThreadHandle *pHandle)

{

	UpdateReader ur;

	ur.PerformUpdate(update_url.c_str());

	smutils->AddFrameAction(PumpUpdate, ur.DetachParts());

}

void SmUpdater::OnTerminate(IThreadHandle *pHandle, bool cancel)

{

}

void AddUpdateError(const char *fmt, ...)

{

	va_list ap;

	char buffer[2048];

	va_start(ap, fmt);

	smutils->FormatArgs(buffer, sizeof(buffer), fmt, ap);

	va_end(ap);

	update_errors.push_back(new String(buffer));

}

const char *SmUpdater::GetExtensionVerString()

{

	return SM_VERSION_STRING;

}

const char *SmUpdater::GetExtensionDateString()

{

	return SM_BUILD_TIMESTAMP;

}