/* $Id$ */

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file game_core.cpp Implementation of Game. */

#include "../stdafx.h"
#include "../command_func.h"
#include "../core/backup_type.hpp"
#include "../core/bitmath_func.hpp"
#include "../company_base.h"
#include "../company_func.h"
#include "../network/network.h"
#include "../window_func.h"
#include "../fileio_func.h"
#include "game.hpp"
#include "game_scanner.hpp"
#include "game_config.hpp"
#include "game_instance.hpp"

/* static */ uint Game::frame_counter = 0;
/* static */ GameInfo *Game::info = NULL;
/* static */ GameInstance *Game::instance = NULL;
/* static */ GameScannerInfo *Game::scanner_info = NULL;
/* static */ GameScannerLibrary *Game::scanner_library = NULL;

/* static */ void Game::GameLoop()
{
	if (_networking && !_network_server) return;
	if (Game::instance == NULL) return;

	Game::frame_counter++;

	Backup<CompanyByte> cur_company(_current_company, FILE_LINE);
	cur_company.Change(OWNER_DEITY);
	Game::instance->GameLoop();
	cur_company.Restore();

	/* Occasionally collect garbage */
	if ((Game::frame_counter & 255) == 0) {
		Game::instance->CollectGarbage();
	}
}

/* static */ void Game::Initialize()
{
	if (Game::instance != NULL) Game::Uninitialize(true);

	Game::frame_counter = 0;

	if (Game::scanner_info == NULL) {
		TarScanner::DoScan(TarScanner::GAME);
		Game::scanner_info = new GameScannerInfo();
		Game::scanner_info->Initialize();
		Game::scanner_library = new GameScannerLibrary();
		Game::scanner_library->Initialize();
	}
}

/* static */ void Game::StartNew()
{
	if (Game::instance != NULL) return;

	/* Clients shouldn't start GameScripts */
	if (_networking && !_network_server) return;

	GameConfig *config = GameConfig::GetConfig();
	GameInfo *info = config->GetInfo();
	if (info == NULL) return;

	Backup<CompanyByte> cur_company(_current_company, FILE_LINE);
	cur_company.Change(OWNER_DEITY);

	Game::info = info;
	Game::instance = new GameInstance();
	Game::instance->Initialize(info);

	cur_company.Restore();

	InvalidateWindowData(WC_AI_DEBUG, 0, -1);
}

/* static */ void Game::Uninitialize(bool keepConfig)
{
	delete Game::instance;
	Game::instance = NULL;

	if (keepConfig) {
		Rescan();
	} else {
		delete Game::scanner_info;
		delete Game::scanner_library;
		Game::scanner_info = NULL;
		Game::scanner_library = NULL;

		if (_settings_game.game_config != NULL) {
			delete _settings_game.game_config;
			_settings_game.game_config = NULL;
		}
		if (_settings_newgame.game_config != NULL) {
			delete _settings_newgame.game_config;
			_settings_newgame.game_config = NULL;
		}
	}
}

/* static */ void Game::ResetConfig()
{
	/* Check for both newgame as current game if we can reload the GameInfo insde
	 *  the GameConfig. If not, remove the Game from the list. */
	if (_settings_game.game_config != NULL && _settings_game.game_config->HasScript()) {
		if (!_settings_game.game_config->ResetInfo(true)) {
			DEBUG(script, 0, "After a reload, the GameScript by the name '%s' was no longer found, and removed from the list.", _settings_game.game_config->GetName());
			_settings_game.game_config->Change(NULL);
			if (Game::instance != NULL) {
				delete Game::instance;
				Game::instance = NULL;
			}
		} else if (Game::instance != NULL) {
			Game::info = _settings_game.game_config->GetInfo();
		}
	}
	if (_settings_newgame.game_config != NULL && _settings_newgame.game_config->HasScript()) {
		if (!_settings_newgame.game_config->ResetInfo(false)) {
			DEBUG(script, 0, "After a reload, the GameScript by the name '%s' was no longer found, and removed from the list.", _settings_newgame.game_config->GetName());
			_settings_newgame.game_config->Change(NULL);
		}
	}
}

/* static */ void Game::Rescan()
{
	TarScanner::DoScan(TarScanner::GAME);

	Game::scanner_info->RescanDir();
	Game::scanner_library->RescanDir();
	ResetConfig();

	InvalidateWindowData(WC_AI_LIST, 0, 1);
	SetWindowClassesDirty(WC_AI_DEBUG);
	SetWindowDirty(WC_AI_SETTINGS, 0);
}


/* static */ void Game::Save()
{
	if (Game::instance != NULL && (!_networking || _network_server)) {
		Backup<CompanyByte> cur_company(_current_company, OWNER_DEITY, FILE_LINE);
		Game::instance->Save();
		cur_company.Restore();
	} else {
		GameInstance::SaveEmpty();
	}
}

/* static */ void Game::Load(int version)
{
	if (Game::instance != NULL && (!_networking || _network_server)) {
		Backup<CompanyByte> cur_company(_current_company, OWNER_DEITY, FILE_LINE);
		Game::instance->Load(version);
		cur_company.Restore();
	} else {
		/* Read, but ignore, the load data */
		GameInstance::LoadEmpty();
	}
}

/* static */ char *Game::GetConsoleList(char *p, const char *last, bool newest_only)
{
	return Game::scanner_info->GetConsoleList(p, last, newest_only);
}

/* static */ char *Game::GetConsoleLibraryList(char *p, const char *last)
{
	 return Game::scanner_library->GetConsoleList(p, last, true);
}

/* static */ const ScriptInfoList *Game::GetInfoList()
{
	return Game::scanner_info->GetInfoList();
}

/* static */ const ScriptInfoList *Game::GetUniqueInfoList()
{
	return Game::scanner_info->GetUniqueInfoList();
}

/* static */ GameInfo *Game::FindInfo(const char *name, int version, bool force_exact_match)
{
	return Game::scanner_info->FindInfo(name, version, force_exact_match);
}

/* static */ GameLibrary *Game::FindLibrary(const char *library, int version)
{
	return Game::scanner_library->FindLibrary(library, version);
}

#if defined(ENABLE_NETWORK)

/**
 * Check whether we have an Game (library) with the exact characteristics as ci.
 * @param ci the characteristics to search on (shortname and md5sum)
 * @param md5sum whether to check the MD5 checksum
 * @return true iff we have an Game (library) matching.
 */
/* static */ bool Game::HasGame(const ContentInfo *ci, bool md5sum)
{
	return Game::scanner_info->HasScript(ci, md5sum);
}

/* static */ bool Game::HasGameLibrary(const ContentInfo *ci, bool md5sum)
{
	return Game::scanner_library->HasScript(ci, md5sum);
}

#endif /* defined(ENABLE_NETWORK) */