game_controller.cpp

/*
   Copyright (C) 2003 - 2014 by David White <dave@whitevine.net>
   Part of the Battle for Wesnoth Project http://www.wesnoth.org/

   This program 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; either version 2 of the License, or
   (at your option) any later version.
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY.

   See the COPYING file for more details.
*/

#include "game_controller.hpp"

#include "about.hpp"
#include "construct_dialog.hpp"
#include "gettext.hpp"
#include "gui/dialogs/addon_connect.hpp"
#include "gui/dialogs/campaign_difficulty.hpp"
#include "gui/dialogs/campaign_selection.hpp"
#include "gui/dialogs/language_selection.hpp"
#include "gui/dialogs/message.hpp"
#include "gui/dialogs/mp_method_selection.hpp"
#include "gui/dialogs/title_screen.hpp"
#include "gui/dialogs/transient_message.hpp"
#ifdef DEBUG_WINDOW_LAYOUT_GRAPHS
#include "gui/widgets/debug.hpp"
#endif
#include "gui/auxiliary/event/handler.hpp"
#include "gui/widgets/settings.hpp"
#include "gui/widgets/window.hpp"
#include "intro.hpp"
#include "language.hpp"
#include "loadscreen.hpp"
#include "log.hpp"
#include "map_exception.hpp"
#include "multiplayer.hpp"
#include "network.hpp"
#include "playcampaign.hpp"
#include "preferences_display.hpp"
#include "replay.hpp"
#include "savegame.hpp"
#include "scripting/lua.hpp"
#include "statistics.hpp"
#include "wml_exception.hpp"
#include "gui/dialogs/mp_host_game_prompt.hpp"

#include <boost/foreach.hpp>

static lg::log_domain log_config("config");
#define ERR_CONFIG LOG_STREAM(err, log_config)
#define WRN_CONFIG LOG_STREAM(warn, log_config)
#define LOG_CONFIG LOG_STREAM(info, log_config)

#define LOG_GENERAL LOG_STREAM(info, lg::general)
#define WRN_GENERAL LOG_STREAM(warn, lg::general)
#define DBG_GENERAL LOG_STREAM(debug, lg::general)

static lg::log_domain log_mp_create("mp/create");
#define DBG_MP LOG_STREAM(debug, log_mp_create)

static lg::log_domain log_network("network");
#define ERR_NET LOG_STREAM(err, log_network)

static lg::log_domain log_enginerefac("enginerefac");
#define LOG_RG LOG_STREAM(info, log_enginerefac)

static bool less_campaigns_rank(const config &a, const config &b) {
	return a["rank"].to_int(1000) < b["rank"].to_int(1000);
}

game_controller::game_controller(const commandline_options& cmdline_opts, const char *appname) :
	cmdline_opts_(cmdline_opts),
	disp_(NULL),
	video_(),
	thread_manager(),
	font_manager_(),
	prefs_manager_(),
	image_manager_(),
	main_event_context_(),
	hotkey_manager_(),
	music_thinker_(),
	resize_monitor_(),
	test_scenario_("test"),
	screenshot_map_(),
	screenshot_filename_(),
	state_(),
	multiplayer_server_(),
	jump_to_multiplayer_(false),
	jump_to_campaign_(false, -1, "", ""),
	jump_to_editor_(false)
{
	bool no_music = false;
	bool no_sound = false;

	// The path can be hardcoded and it might be a relative path.
	if(!game_config::path.empty() &&
#ifdef _WIN32
		// use c_str to ensure that index 1 points to valid element since c_str() returns null-terminated string
		game_config::path.c_str()[1] != ':'
#else
		game_config::path[0] != '/'
#endif
	)
	{
		game_config::path = get_cwd() + '/' + game_config::path;
		font_manager_.update_font_path();
	}

	const std::string app_basename = file_name(appname);
	jump_to_editor_ = app_basename.find("editor") != std::string::npos;

	if (cmdline_opts_.campaign)	{
		jump_to_campaign_.jump_ = true;
		jump_to_campaign_.campaign_id_ = *cmdline_opts_.campaign;
		std::cerr << "selected campaign id: [" << jump_to_campaign_.campaign_id_ << "]\n";

		if (cmdline_opts_.campaign_difficulty) {
			jump_to_campaign_.difficulty_ = *cmdline_opts_.campaign_difficulty;
			std::cerr << "selected difficulty: [" << jump_to_campaign_.difficulty_ << "]\n";
		}
		else
			jump_to_campaign_.difficulty_ = -1; // let the user choose the difficulty

		if (cmdline_opts_.campaign_scenario) {
			jump_to_campaign_.scenario_id_ = *cmdline_opts_.campaign_scenario;
			std::cerr << "selected scenario id: [" << jump_to_campaign_.scenario_id_ << "]\n";
		}
	}
	if (cmdline_opts_.clock)
		gui2::show_debug_clock_button = true;
	if (cmdline_opts_.debug) {
		game_config::debug = true;
		game_config::mp_debug = true;
	}
#ifdef DEBUG_WINDOW_LAYOUT_GRAPHS
	if (cmdline_opts_.debug_dot_domain)
		gui2::tdebug_layout_graph::set_domain (*cmdline_opts_.debug_dot_domain);
	if (cmdline_opts_.debug_dot_level)
		gui2::tdebug_layout_graph::set_level (*cmdline_opts_.debug_dot_level);
#endif
	if (cmdline_opts_.editor)
	{
		jump_to_editor_ = true;
		if(!cmdline_opts_.editor->empty())
			game::load_game_exception::game = *cmdline_opts_.editor;
	}
	if (cmdline_opts_.fps)
		preferences::set_show_fps(true);
	if (cmdline_opts_.fullscreen)
		preferences::set_fullscreen(true);
	if (cmdline_opts_.load)
		game::load_game_exception::game = *cmdline_opts_.load;
	if (cmdline_opts_.max_fps) {
		int fps;
		//FIXME: remove the next line once the weird util.cpp specialized template lexical_cast_default() linking issue is solved
		fps = lexical_cast_default<int>("", 50);
		fps = *cmdline_opts_.max_fps;
		fps = std::min<int>(fps, 1000);
		fps = std::max<int>(fps, 1);
		fps = 1000 / fps;
		// increase the delay to avoid going above the maximum
		if(1000 % fps != 0) {
			++fps;
		}
		preferences::set_draw_delay(fps);
	}
	if (cmdline_opts_.nogui) {
		no_sound = true;
		preferences::disable_preferences_save();
	}
	if (cmdline_opts_.new_widgets)
		gui2::new_widgets = true;
	if (cmdline_opts_.nodelay)
		game_config::no_delay = true;
	if (cmdline_opts_.nomusic)
		no_music = true;
	if (cmdline_opts_.nosound)
		no_sound = true;
	//These commented lines should be used to implement support of connection
	//through a proxy via command line options.
	//The ANA network module should implement these methods (while the SDL_net won't.)
	if (cmdline_opts_.proxy)
		network::enable_connection_through_proxy();
	if (cmdline_opts_.proxy_address)
	{
		network::enable_connection_through_proxy();
		network::set_proxy_address(*cmdline_opts_.proxy_address);
	}
	if (cmdline_opts_.proxy_password)
	{
		network::enable_connection_through_proxy();
		network::set_proxy_password(*cmdline_opts_.proxy_password);
	}
	if (cmdline_opts_.proxy_port)
	{
		network::enable_connection_through_proxy();
		network::set_proxy_port(*cmdline_opts_.proxy_port);
	}
	if (cmdline_opts_.proxy_user)
	{
		network::enable_connection_through_proxy();
		network::set_proxy_user(*cmdline_opts_.proxy_user);
	}
	if (cmdline_opts_.resolution) {
		const int xres = cmdline_opts_.resolution->get<0>();
		const int yres = cmdline_opts_.resolution->get<1>();
		if(xres > 0 && yres > 0) {
			const std::pair<int,int> resolution(xres,yres);
			preferences::set_resolution(resolution);
		}
	}
	if (cmdline_opts_.screenshot) {
		//TODO it could be simplified to use cmdline_opts_ directly if there is no other way to enter screenshot mode
		screenshot_map_ = *cmdline_opts_.screenshot_map_file;
		screenshot_filename_ = *cmdline_opts_.screenshot_output_file;
		no_sound = true;
		preferences::disable_preferences_save();
	}
	if (cmdline_opts_.server){
		jump_to_multiplayer_ = true;
		//Do we have any server specified ?
		if (!cmdline_opts_.server->empty())
			multiplayer_server_ = *cmdline_opts_.server;
		else //Pick the first server in config
		{
			if (game_config::server_list.size() > 0)
				multiplayer_server_ = preferences::network_host();
			else
				multiplayer_server_ = "";
		}
	}
	if (cmdline_opts_.username) {
		preferences::disable_preferences_save();
		preferences::set_login(*cmdline_opts_.username);
	}
	if (cmdline_opts_.password) {
		preferences::disable_preferences_save();
		preferences::set_password(*cmdline_opts_.password);
	}
	if (cmdline_opts_.test)
	{
		if (!cmdline_opts_.test->empty())
			test_scenario_ = *cmdline_opts_.test;
	}
	if (cmdline_opts_.windowed)
		preferences::set_fullscreen(false);
	if (cmdline_opts_.with_replay)
		game::load_game_exception::show_replay = true;

	std::cerr << '\n';
	std::cerr << "Data directory: " << game_config::path
		<< "\nUser configuration directory: " << get_user_config_dir()
		<< "\nUser data directory: " << get_user_data_dir()
		<< "\nCache directory: " << get_cache_dir()
		<< '\n';

	// disable sound in nosound mode, or when sound engine failed to initialize
	if (no_sound || ((preferences::sound_on() || preferences::music_on() ||
	                  preferences::turn_bell() || preferences::UI_sound_on()) &&
	                 !sound::init_sound())) {
		preferences::set_sound(false);
		preferences::set_music(false);
		preferences::set_turn_bell(false);
		preferences::set_UI_sound(false);
	}
	else if (no_music) { // else disable the music in nomusic mode
		preferences::set_music(false);
	}
}

game_display& game_controller::disp()
{
	if(disp_.get() == NULL) {
		if(get_video_surface() == NULL) {
			throw CVideo::error();
		}
		disp_.assign(game_display::create_dummy_display(video_));
	}
	return *disp_.get();
}

bool game_controller::init_joystick()
{
	if (!preferences::joystick_support_enabled())
		return false;

	if(SDL_WasInit(SDL_INIT_JOYSTICK) == 0)
		if(SDL_InitSubSystem(SDL_INIT_JOYSTICK) == -1)
			return false;

	int joysticks = SDL_NumJoysticks();
	if (joysticks == 0) return false;

	SDL_JoystickEventState(SDL_ENABLE);

	bool joystick_found = false;
	for (int i = 0; i<joysticks; i++)  {

		if (SDL_JoystickOpen(i))
			joystick_found = true;
	}
	return joystick_found;
}

bool game_controller::init_language()
{
	if(!::load_language_list())
		return false;

	language_def locale;
	if(cmdline_opts_.language) {
		std::vector<language_def> langs = get_languages();
		BOOST_FOREACH(const language_def & def, langs) {
			if(def.localename == *cmdline_opts_.language) {
				locale = def;
				break;
			}
		}
		if(locale.localename.empty()) {
			std::cerr << "Language symbol '" << *cmdline_opts_.language << "' not found.\n";
			return false;
		}
	} else {
		locale = get_locale();
	}
	::set_language(locale);

	if(!cmdline_opts_.nogui) {
		std::string wm_title_string = _("The Battle for Wesnoth");
		wm_title_string += " - " + game_config::revision;
		SDL_WM_SetCaption(wm_title_string.c_str(), NULL);
	}

	return true;
}

bool game_controller::init_video()
{
	if(cmdline_opts_.nogui) {
		if( !(cmdline_opts_.multiplayer || cmdline_opts_.screenshot) ) {
			std::cerr << "--nogui flag is only valid with --multiplayer flag or --screenshot flag\n";
			return false;
		}
		video_.make_fake();
		game_config::no_delay = true;
		return true;
	}

#if !(defined(__APPLE__))
	surface icon(image::get_image("game-icon.png", image::UNSCALED));
	if(icon != NULL) {
		///must be called after SDL_Init() and before setting video mode
		SDL_WM_SetIcon(icon,NULL);
	}
#endif

	std::pair<int,int> resolution;
	int bpp = 0;
	int video_flags = 0;

	bool found_matching = preferences::detect_video_settings(video_, resolution, bpp, video_flags);

	if (cmdline_opts_.bpp) {
		bpp = *cmdline_opts_.bpp;
	} else if (cmdline_opts_.screenshot) {
		bpp = 32;
	}

	if(!found_matching && (video_flags & FULL_SCREEN)) {
		video_flags ^= FULL_SCREEN;
		found_matching = preferences::detect_video_settings(video_, resolution, bpp, video_flags);
		if (found_matching) {
			std::cerr << "Failed to set " << resolution.first << 'x' << resolution.second << 'x' << bpp << " in fullscreen mode. Using windowed instead.\n";
		}
	}

	if(!found_matching) {
		std::cerr << "Video mode " << resolution.first << 'x'
			<< resolution.second << 'x' << bpp
			<< " is not supported.\n";

		return false;
	}

	std::cerr << "setting mode to " << resolution.first << "x" << resolution.second << "x" << bpp << "\n";
	const int res = video_.setMode(resolution.first,resolution.second,bpp,video_flags);
	video_.setBpp(bpp);
	if(res == 0) {
		std::cerr << "required video mode, " << resolution.first << "x"
		          << resolution.second << "x" << bpp << " is not supported\n";
		return false;
	}

	return true;
}

bool game_controller::play_test()
{
	static bool first_time = true;

	if(!cmdline_opts_.test) {
		return true;
	}
	if(!first_time)
		return false;

	first_time = false;

	state_.classification().campaign_type = "test";
	state_.carryover_sides_start["next_scenario"] = test_scenario_;
	state_.classification().campaign_define = "TEST";

	resources::config_manager->
		load_game_config_for_game(state_.classification());

	try {
		play_game(disp(),state_,resources::config_manager->game_config());
	} catch (game::load_game_exception &) {
		return true;
	}

	return false;
}

bool game_controller::play_screenshot_mode()
{
	if(!cmdline_opts_.screenshot) {
		return true;
	}

	resources::config_manager->load_game_config_for_editor();

	::init_textdomains(resources::config_manager->game_config());

	editor::start(resources::config_manager->game_config(), video_,
	    screenshot_map_, true, screenshot_filename_);
	return false;
}

bool game_controller::is_loading() const
{
	return !game::load_game_exception::game.empty();
}

bool game_controller::load_game()
{
	savegame::loadgame load(disp(), resources::config_manager->game_config(),
	    state_);

	try {
		load.load_game(game::load_game_exception::game, game::load_game_exception::show_replay, game::load_game_exception::cancel_orders, game::load_game_exception::select_difficulty, game::load_game_exception::difficulty);


		try {
			resources::config_manager->
				load_game_config_for_game(state_.classification());
		} catch(config::error&) {
			return false;
		}

		load.set_gamestate();

	} catch(load_game_cancelled_exception&) {
		clear_loaded_game();
		return false;
	} catch(config::error& e) {
		if(e.message.empty()) {
			gui2::show_error_message(disp().video(), _("The file you have tried to load is corrupt"));
		}
		else {
			gui2::show_error_message(disp().video(), _("The file you have tried to load is corrupt: '") + e.message + '\'');
		}
		return false;
	} catch(twml_exception& e) {
		e.show(disp());
		return false;
	} catch(io_exception& e) {
		if(e.message.empty()) {
			gui2::show_error_message(disp().video(), _("File I/O Error while reading the game"));
		} else {
			gui2::show_error_message(disp().video(), _("File I/O Error while reading the game: '") + e.message + '\'');
		}
		return false;
	} catch(game::error& e) {
		if(e.message.empty()) {
			gui2::show_error_message(disp().video(), _("The file you have tried to load is corrupt"));
		}
		else {
			gui2::show_error_message(disp().video(), _("The file you have tried to load is corrupt: '") + e.message + '\'');
		}
		return false;
	}
	recorder = replay(state_.replay_data);
	recorder.start_replay();
	recorder.set_skip(false);

	LOG_CONFIG << "has snapshot: " << (state_.snapshot.child("side") ? "yes" : "no") << "\n";

	if (!state_.snapshot.child("side")) {
		// No snapshot; this is a start-of-scenario
		if (load.show_replay()) {
			// There won't be any turns to replay, but the
			// user gets to watch the intro sequence again ...
			LOG_CONFIG << "replaying (start of scenario)\n";
		} else {
			LOG_CONFIG << "skipping...\n";
			recorder.set_skip(false);
		}
	} else {
		// We have a snapshot. But does the user want to see a replay?
		if(load.show_replay()) {
			statistics::clear_current_scenario();
			LOG_CONFIG << "replaying (snapshot)\n";
		} else {
			LOG_CONFIG << "setting replay to end...\n";
			recorder.set_to_end();
			if(!recorder.at_end()) {
				WRN_CONFIG << "recorder is not at the end!!!\n";
			}
		}
	}

	if(state_.classification().campaign_type == "multiplayer") {
		BOOST_FOREACH(config &side, state_.snapshot.child_range("side"))
		{
			if (side["controller"] == "network")
				side["controller"] = "human";
			if (side["controller"] == "network_ai")
				side["controller"] = "ai";
		}
		gui2::show_message(disp().video(), _("Warning") , _("This is a multiplayer scenario. Some parts of it may not work properly in single-player. It is recommended to load this scenario through the Multiplayer -> Load Game dialog instead."));
	}

	if (load.cancel_orders()) {
		BOOST_FOREACH(config &side, state_.snapshot.child_range("side"))
		{
			if (side["controller"] != "human") continue;
			BOOST_FOREACH(config &unit, side.child_range("unit"))
			{
				unit["goto_x"] = -999;
				unit["goto_y"] = -999;
			}
		}
	}

	return true;
}

void game_controller::set_tutorial()
{
	state_ = game_state();
	state_.classification().campaign_type = "tutorial";
	state_.carryover_sides_start["next_scenario"] = "tutorial";
	state_.classification().campaign_define = "TUTORIAL";
}

void game_controller::mark_completed_campaigns(std::vector<config> &campaigns)
{
	BOOST_FOREACH(config &campaign, campaigns) {
		campaign["completed"] = preferences::is_campaign_completed(campaign["id"]);
	}
}

bool game_controller::new_campaign()
{
	state_ = game_state();
	state_.classification().campaign_type = "scenario";

	std::vector<config> campaigns;
	BOOST_FOREACH(const config& campaign,
		resources::config_manager->game_config().child_range("campaign")) {

		if (campaign["type"] != "mp") {
			campaigns.push_back(campaign);
		}
	}

	mark_completed_campaigns(campaigns);
	std::stable_sort(campaigns.begin(),campaigns.end(),less_campaigns_rank);

	if(campaigns.begin() == campaigns.end()) {
	  gui2::show_error_message(disp().video(),
				  _("No campaigns are available.\n"));
		return false;
	}

	int campaign_num = -1;
	// No campaign selected from command line
	if (jump_to_campaign_.campaign_id_.empty() == true)
	{
		gui2::tcampaign_selection dlg(campaigns);

		try {
			dlg.show(disp().video());
		} catch(twml_exception& e) {
			e.show(disp());
			return false;
		}

		if(dlg.get_retval() != gui2::twindow::OK) {
			return false;
		}

		campaign_num = dlg.get_choice();
	}
	else
	{
		// don't reset the campaign_id_ so we can know
		// if we should quit the game or return to the main menu

		// checking for valid campaign name
		for(size_t i = 0; i < campaigns.size(); ++i)
		{
			if (campaigns[i]["id"] == jump_to_campaign_.campaign_id_)
			{
				campaign_num = i;
				break;
			}
		}

		// didn't found any campaign with that id
		if (campaign_num == -1)
		{
			std::cerr<<"No such campaign id to jump to: ["<<jump_to_campaign_.campaign_id_<<"]\n";
			return false;
		}
	}

	const config &campaign = campaigns[campaign_num];
	state_.classification().campaign = campaign["id"].str();
	state_.classification().abbrev = campaign["abbrev"].str();

	// we didn't specify in the command line the scenario to be started
	if (jump_to_campaign_.scenario_id_.empty())
		state_.carryover_sides_start["next_scenario"] = campaign["first_scenario"].str();
	else
		state_.carryover_sides_start["next_scenario"] = jump_to_campaign_.scenario_id_;

	state_.classification().end_text = campaign["end_text"].str();
	state_.classification().end_text_duration = campaign["end_text_duration"];

	const std::string difficulty_descriptions = campaign["difficulty_descriptions"];
	std::vector<std::string> difficulty_options = utils::split(difficulty_descriptions, ';');

	const std::vector<std::string> difficulties = utils::split(campaign["difficulties"]);

	if(difficulties.empty() == false) {
		int difficulty = 0;
		if (jump_to_campaign_.difficulty_ == -1){
			if(difficulty_options.size() != difficulties.size()) {
				difficulty_options.resize(difficulties.size());
				std::copy(difficulties.begin(),difficulties.end(),difficulty_options.begin());
			}

			gui2::tcampaign_difficulty dlg(difficulty_options);
			dlg.show(disp().video());

			if(dlg.selected_index() == -1) {
				if (jump_to_campaign_.campaign_id_.empty() == false)
				{
					jump_to_campaign_.campaign_id_ = "";
				}
				// canceled difficulty dialog, relaunch the campaign selection dialog
				return new_campaign();
			}
			difficulty = dlg.selected_index();
		}
		else
		{
			if (jump_to_campaign_.difficulty_
					> static_cast<int>(difficulties.size()))
			{
				std::cerr << "incorrect difficulty number: [" <<
					jump_to_campaign_.difficulty_ << "]. maximum is [" <<
					difficulties.size() << "].\n";
				return false;
			}
			else
			{
				difficulty = jump_to_campaign_.difficulty_ - 1;
			}
		}

		state_.carryover_sides_start["difficulty"] = difficulties[difficulty];
		state_.classification().difficulty = difficulties[difficulty];
	}

	state_.classification().campaign_define = campaign["define"].str();
	state_.classification().campaign_xtra_defines = utils::split(campaign["extra_defines"]);

	return true;
}

std::string game_controller::jump_to_campaign_id() const
{
	return jump_to_campaign_.campaign_id_;
}

bool game_controller::goto_campaign()
{
	if(jump_to_campaign_.jump_){
		if(new_campaign()) {
			jump_to_campaign_.jump_ = false;
			launch_game(game_controller::RELOAD_DATA);
		}else{
			jump_to_campaign_.jump_ = false;
			return false;
		}
	}
	return true;
}

bool game_controller::goto_multiplayer()
{
	if(jump_to_multiplayer_){
		jump_to_multiplayer_ = false;
		if(play_multiplayer()){
			;
		}else{
			return false;
		}
	}
	return true;
}

bool game_controller::goto_editor()
{
	if(jump_to_editor_){
		jump_to_editor_ = false;
		if (start_editor(normalize_path(game::load_game_exception::game)) ==
		    editor::EXIT_QUIT_TO_DESKTOP)
		{
			return false;
		}
		clear_loaded_game();
	}
	return true;
}

void game_controller::start_wesnothd()
{
	const std::string wesnothd_program =
		preferences::get_mp_server_program_name().empty() ?
		get_program_invocation("wesnothd") : preferences::get_mp_server_program_name();

	std::string config = get_user_config_dir() + "/lan_server.cfg";
	if (!file_exists(config)) {
		// copy file if it isn't created yet
		write_file(config, read_file(get_wml_location("lan_server.cfg")));
	}

#ifndef _WIN32
	std::string command = "\"" + wesnothd_program +"\" -c \"" + config + "\" -d -t 2 -T 5";
#else
	// start wesnoth as background job
	std::string command = "cmd /C start \"wesnoth server\" /B \"" + wesnothd_program + "\" -c \"" + config + "\" -t 2 -T 5";
#endif
	LOG_GENERAL << "Starting wesnothd: "<< command << "\n";
	if (std::system(command.c_str()) == 0) {
		// Give server a moment to start up
		SDL_Delay(50);
		return;
	}
	preferences::set_mp_server_program_name("");

	// Couldn't start server so throw error
	WRN_GENERAL << "Failed to run server start script\n";
	throw game::mp_server_error("Starting MP server failed!");
}

bool game_controller::play_multiplayer()
{
	int res;

	state_ = game_state();
	state_.classification().campaign_type = "multiplayer";

	//Print Gui only if the user hasn't specified any server
	if( multiplayer_server_.empty() ){

		int start_server;
		do {
			start_server = 0;

			gui2::tmp_method_selection dlg;

			dlg.show(disp().video());

			if(dlg.get_retval() == gui2::twindow::OK) {
				res = dlg.get_choice();
			} else {
				return false;

			}

			if (res == 2 && preferences::mp_server_warning_disabled() < 2) {
				start_server = !gui2::tmp_host_game_prompt::execute(disp().video());
			}
		} while (start_server);
		if (res < 0) {
			return false;
		}

	}else{
		res = 4;
	}

	try {
		if (res == 2)
		{
			try {
				start_wesnothd();
			} catch(game::mp_server_error&)
			{
				std::string path = preferences::show_wesnothd_server_search(disp());

				if (!path.empty())
				{
					preferences::set_mp_server_program_name(path);
					start_wesnothd();
				}
				else
				{
					return false;
				}
			}


		}

		resources::config_manager->
			load_game_config_for_game(state_.classification());

		events::discard_input(); // prevent the "keylogger" effect
		cursor::set(cursor::NORMAL);

		if(res == 3) {
			mp::start_local_game(disp(),
			    resources::config_manager->game_config(), state_);
		} else if((res >= 0 && res <= 2) || res == 4) {
			std::string host;
			if(res == 0) {
				host = preferences::server_list().front().address;
			}else if(res == 2) {
				host = "localhost";
			}else if(res == 4){
				host = multiplayer_server_;
				multiplayer_server_ = "";
			}
			mp::start_client(disp(), resources::config_manager->game_config(),
				state_, host);
		}

	} catch(game::mp_server_error& e) {
		gui2::show_error_message(disp().video(), _("Error while starting server: ") + e.message);
	} catch(game::load_game_failed& e) {
		gui2::show_error_message(disp().video(), _("The game could not be loaded: ") + e.message);
	} catch(game::game_error& e) {
		gui2::show_error_message(disp().video(), _("Error while playing the game: ") + e.message);
	} catch(network::error& e) {
		if(e.message != "") {
			ERR_NET << "caught network::error: " << e.message << "\n";
			gui2::show_transient_message(disp().video()
					, ""
					, gettext(e.message.c_str()));
		} else {
			ERR_NET << "caught network::error\n";
		}
	} catch(config::error& e) {
		if(e.message != "") {
			ERR_CONFIG << "caught config::error: " << e.message << "\n";
			gui2::show_transient_message(disp().video(), "", e.message);
		} else {
			ERR_CONFIG << "caught config::error\n";
		}
	} catch(incorrect_map_format_error& e) {
		gui2::show_error_message(disp().video(), std::string(_("The game map could not be loaded: ")) + e.message);
	} catch (game::load_game_exception &) {
		//this will make it so next time through the title screen loop, this game is loaded
	} catch(twml_exception& e) {
		e.show(disp());
	}

	return false;
}

bool game_controller::play_multiplayer_commandline()
{
	if(!cmdline_opts_.multiplayer) {
		return true;
	}

	DBG_MP << "starting multiplayer game from the commandline" << std::endl;

	// These are all the relevant lines taken literally from play_multiplayer() above
	state_ = game_state();
	state_.classification().campaign_type = "multiplayer";

	resources::config_manager->
		load_game_config_for_game(state_.classification());

	events::discard_input(); // prevent the "keylogger" effect
	cursor::set(cursor::NORMAL);

	mp::start_local_game_commandline(disp(),
	    resources::config_manager->game_config(), state_, cmdline_opts_);

	return false;
}

bool game_controller::change_language()
{
	gui2::tlanguage_selection dlg;
	dlg.show(disp().video());
	if (dlg.get_retval() != gui2::twindow::OK) return false;

	if (!cmdline_opts_.nogui) {
		std::string wm_title_string = _("The Battle for Wesnoth");
		wm_title_string += " - " + game_config::revision;
		SDL_WM_SetCaption(wm_title_string.c_str(), NULL);
	}

	return true;
}

void game_controller::show_preferences()
{
	const preferences::display_manager disp_manager(&disp());
	preferences::show_preferences_dialog(disp(),
	    resources::config_manager->game_config());

	disp().redraw_everything();
}

void game_controller::launch_game(RELOAD_GAME_DATA reload)
{
	loadscreen::global_loadscreen_manager loadscreen_manager(disp().video());
	loadscreen::start_stage("load data");
	if(reload == RELOAD_DATA) {
		try {
			resources::config_manager->
				load_game_config_for_game(state_.classification());
		} catch(config::error&) {
			return;
		}
	}

	try {
		const LEVEL_RESULT result = play_game(disp(),state_,
		    resources::config_manager->game_config());
		// don't show The End for multiplayer scenario
		// change this if MP campaigns are implemented
		if(result == VICTORY && (state_.classification().campaign_type.empty() || state_.classification().campaign_type != "multiplayer")) {
			preferences::add_completed_campaign(state_.classification().campaign);
			the_end(disp(), state_.classification().end_text, state_.classification().end_text_duration);
			if(state_.classification().end_credits) {
				about::show_about(disp(),state_.classification().campaign);
			}
		}

		clear_loaded_game();
	} catch (game::load_game_exception &) {
		//this will make it so next time through the title screen loop, this game is loaded
	} catch(twml_exception& e) {
		e.show(disp());
	}
}

void game_controller::play_replay()
{
	try {
		::play_replay(disp(),state_,resources::config_manager->game_config(),
		    video_);

		clear_loaded_game();
	} catch (game::load_game_exception &) {
		//this will make it so next time through the title screen loop, this game is loaded
	} catch(twml_exception& e) {
		e.show(disp());
	}
}

editor::EXIT_STATUS game_controller::start_editor(const std::string& filename)
{
	while(true){
		resources::config_manager->load_game_config_for_editor();

		::init_textdomains(resources::config_manager->game_config());

		editor::EXIT_STATUS res = editor::start(
		    resources::config_manager->game_config(), video_, filename);

		if(res != editor::EXIT_RELOAD_DATA)
			return res;

		resources::config_manager->reload_changed_game_config();
		image::flush_cache();
	}
	return editor::EXIT_ERROR; // not supposed to happen
}

game_controller::~game_controller()
{
	gui::dialog::delete_empty_menu();
	sound::close_sound();
}