playsingle_controller.cpp

/*
   Copyright (C) 2006 - 2015 by Joerg Hinrichs <joerg.hinrichs@alice-dsl.de>
   wesnoth playlevel Copyright (C) 2003 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.
*/

/**
 *  @file
 *  Logic for single-player game.
 */

#include "playsingle_controller.hpp"

#include "actions/undo.hpp"
#include "ai/manager.hpp"
#include "ai/game_info.hpp"
#include "ai/testing.hpp"
#include "config_assign.hpp"
#include "dialogs.hpp"
#include "display_chat_manager.hpp"
#include "game_end_exceptions.hpp"
#include "game_events/manager.hpp"
#include "game_events/pump.hpp"
#include "game_preferences.hpp"
#include "gettext.hpp"
#include "gui/dialogs/transient_message.hpp"
#include "hotkey_handler_sp.hpp"
#include "log.hpp"
#include "map_label.hpp"
#include "marked-up_text.hpp"
#include "playturn.hpp"
#include "random_new_deterministic.hpp"
#include "replay_helper.hpp"
#include "savegame.hpp"
#include "sound.hpp"
#include "synced_context.hpp"
#include "formula_string_utils.hpp"
#include "events.hpp"
#include "save_blocker.hpp"
#include "scripting/plugins/context.hpp"
#include "soundsource.hpp"
#include "statistics.hpp"
#include "storyscreen/interface.hpp"
#include "unit.hpp"
#include "unit_animation.hpp"
#include "util.hpp"
#include "whiteboard/manager.hpp"
#include "hotkey/hotkey_item.hpp"

#include <boost/foreach.hpp>

static lg::log_domain log_aitesting("aitesting");
#define LOG_AIT LOG_STREAM(info, log_aitesting)
//If necessary, this define can be replaced with `#define LOG_AIT std::cout` to restore previous behavior

static lg::log_domain log_engine("engine");
#define ERR_NG LOG_STREAM(err, log_engine)
#define LOG_NG LOG_STREAM(info, log_engine)

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

playsingle_controller::playsingle_controller(const config& level,
		saved_game& state_of_game, const int ticks,
		const config& game_config, const tdata_cache & tdata,
		CVideo& video, bool skip_replay)
	: play_controller(level, state_of_game, ticks, game_config, tdata, video, skip_replay)
	, cursor_setter(cursor::NORMAL)
	, textbox_info_()
	, replay_sender_(recorder)
	, network_reader_()
	, turn_data_(replay_sender_, network_reader_)
	, end_turn_(false)
	, player_type_changed_(false)
	, skip_next_turn_(false)
	, do_autosaves_(false)
{
	hotkey_handler_.reset(new hotkey_handler(*this, saved_game_)); //upgrade hotkey handler to the sp (whiteboard enabled) version

	
	// game may need to start in linger mode
	linger_ = this->is_regular_game_end();

	ai::game_info ai_info;
	ai::manager::set_ai_info(ai_info);
	ai::manager::add_observer(this) ;

	plugins_context_->set_accessor_string("level_result", boost::bind(&playsingle_controller::describe_result, this));
	plugins_context_->set_accessor_int("turn", boost::bind(&play_controller::turn, this));
}

std::string playsingle_controller::describe_result() const
{
	if(!is_regular_game_end()) {
		return "NONE";
	}
	else if(get_end_level_data_const().is_victory){
		return "VICTORY";
	}
	else {
		return "DEFEAT";
	}
}

playsingle_controller::~playsingle_controller()
{
	ai::manager::remove_observer(this) ;
	ai::manager::clear_ais() ;
}

void playsingle_controller::init_gui(){
	LOG_NG << "Initializing GUI... " << (SDL_GetTicks() - ticks_) << "\n";
	play_controller::init_gui();

	if(gamestate_.first_human_team_ != -1) {
		gui_->scroll_to_tile(gamestate_.board_.map().starting_position(gamestate_.first_human_team_ + 1), game_display::WARP);
	}
	gui_->scroll_to_tile(gamestate_.board_.map().starting_position(1), game_display::WARP);

	update_locker lock_display(gui_->video(), is_skipping_replay());
	get_hotkey_command_executor()->set_button_state(*gui_);
	events::raise_draw_event();
	gui_->draw();
}

void playsingle_controller::report_victory(
	std::ostringstream &report, team& t,
	int finishing_bonus_per_turn, int turns_left, int finishing_bonus)
{
	report << _("Remaining gold: ")
		<< utils::half_signed_value(t.gold()) << "\n";
	if(t.carryover_bonus()) {
		if (turns_left > -1) {
			report << _("Early finish bonus: ")
				   << finishing_bonus_per_turn
				   << " " << _("per turn") << "\n"
				   << "<b>" << _("Turns finished early: ")
				   << turns_left << "</b>\n"
				   << _("Bonus: ")
				   << finishing_bonus << "\n";
		}
		report << _("Gold: ")
		       << utils::half_signed_value(t.gold() + finishing_bonus);
	}
	if (t.gold() > 0) {
		report << '\n' << _("Carry over percentage: ") << t.carryover_percentage();
	}
	if(t.carryover_add()) {
		report << "\n<b>" << _("Bonus Gold: ") << utils::half_signed_value(t.carryover_gold()) <<"</b>";
	} else {
		report << "\n<b>" << _("Retained Gold: ") << utils::half_signed_value(t.carryover_gold()) << "</b>";
	}

	std::string goldmsg;
	utils::string_map symbols;

	symbols["gold"] = lexical_cast_default<std::string>(t.carryover_gold());

	// Note that both strings are the same in English, but some languages will
	// want to translate them differently.
	if(t.carryover_add()) {
		if(t.carryover_gold() > 0) {
			goldmsg = vngettext(
					"You will start the next scenario with $gold "
					"on top of the defined minimum starting gold.",
					"You will start the next scenario with $gold "
					"on top of the defined minimum starting gold.",
					t.carryover_gold(), symbols);

		} else {
			goldmsg = vngettext(
					"You will start the next scenario with "
					"the defined minimum starting gold.",
					"You will start the next scenario with "
					"the defined minimum starting gold.",
					t.carryover_gold(), symbols);
		}
	} else {
		goldmsg = vngettext(
			"You will start the next scenario with $gold "
			"or its defined minimum starting gold, "
			"whichever is higher.",
			"You will start the next scenario with $gold "
			"or its defined minimum starting gold, "
			"whichever is higher.",
			t.carryover_gold(), symbols);
	}

	// xgettext:no-c-format
	report << '\n' << goldmsg;
}

void playsingle_controller::play_scenario_init() {
	// At the beginning of the scenario, save a snapshot as replay_start
	if(saved_game_.replay_start().empty()){
		saved_game_.replay_start() = to_config();
	}

	try {
		fire_preload();
	} catch (end_level_exception &e) {
		if(e.is_quit) {
			this->reset_end_level_data();
		}
		return;
	}

	assert(recorder.at_end());

	if(!loading_game_ )
	{
		assert(recorder.empty());
		recorder.add_start();
		recorder.get_next_action();
		//we can only use a set_scontext_synced with a non empty recorder.
		set_scontext_synced sync;

		try {
			fire_prestart();
		} catch (end_level_exception &e) {
			if(e.is_quit) {
				this->reset_end_level_data();
			}
			return;
		}


		init_gui();
		LOG_NG << "first_time..." << (is_skipping_replay() ? "skipping" : "no skip") << "\n";

		events::raise_draw_event();
		try {
			fire_start();
		} catch (end_level_exception &e) {
			if(e.is_quit) {
				this->reset_end_level_data();
			}
			return;
		}
		sync.do_final_checkup();
		gui_->recalculate_minimap();
	}
	else
	{
		init_gui();
		events::raise_draw_event();
		gamestate_.gamedata_.set_phase(game_data::PLAY);
		gui_->recalculate_minimap();
	}
	if( saved_game_.classification().random_mode != "" && (network::nconnections() != 0)) {
		// This won't cause errors later but we should notify the user about it in case he didn't knew it.
		gui2::show_transient_message(
			gui_->video(),
			// TODO: find a better title
			_("Game Error"),
			_("This multiplayer game uses an alternative random mode, if you don't know what this message means, then most likeley someone is cheating or someone reloaded a corrupt game.")
		);
	}
	return;
}

void playsingle_controller::play_scenario_main_loop() {
	LOG_NG << "starting main loop\n" << (SDL_GetTicks() - ticks_) << "\n";

	// Initialize countdown clock.
	BOOST_FOREACH(const team& t, gamestate_.board_.teams())
	{
		if (saved_game_.mp_settings().mp_countdown && !loading_game_ ){
			t.set_countdown_time(1000 * saved_game_.mp_settings().mp_countdown_init_time);
		}
	}

	// Avoid autosaving after loading, but still
	// allow the first turn to have an autosave.
	do_autosaves_ = !loading_game_;
	ai_testing::log_game_start();
	if(gamestate_.board_.teams().empty())
	{
		ERR_NG << "Playing game with 0 teams." << std::endl;
	}
	for(; ; first_player_ = 1) {
		possible_end_play_signal signal = play_turn();

		if (signal) {
			if(signal->is_quit) {
				reset_end_level_data();
			}
			return;
		}

		do_autosaves_ = true;
	} //end for loop
}

LEVEL_RESULT playsingle_controller::play_scenario(
	const config::const_child_itors &story)
{
	LOG_NG << "in playsingle_controller::play_scenario()...\n";

	// Start music.
	BOOST_FOREACH(const config &m, level_.child_range("music")) {
		sound::play_music_config(m);
	}
	sound::commit_music_changes();

	if(!this->is_skipping_replay()) {
		show_story(*gui_, get_scenario_name(), story);
	}
	gui_->labels().read(level_);

	// Read sound sources
	assert(soundsources_manager_ != NULL);
	BOOST_FOREACH(const config &s, level_.child_range("sound_source")) {
		try {
			soundsource::sourcespec spec(s);
			soundsources_manager_->add(spec);
		} catch (bad_lexical_cast &) {
			ERR_NG << "Error when parsing sound_source config: bad lexical cast." << std::endl;
			ERR_NG << "sound_source config was: " << s.debug() << std::endl;
			ERR_NG << "Skipping this sound source..." << std::endl;
		}
	}

	set_victory_when_enemies_defeated(level_["victory_when_enemies_defeated"].to_bool(true));
	set_remove_from_carryover_on_defeat(level_["remove_from_carryover_on_defeat"].to_bool(true));

	LOG_NG << "entering try... " << (SDL_GetTicks() - ticks_) << "\n";
	try {
		play_scenario_init();
		//FIXME: This ignores QUITs during play_scenario_init()
		if (!is_regular_game_end() && !linger_) {
			play_scenario_main_loop();
		}
		if (game_config::exit_at_end) {
			exit(0);
		}
		if (!is_regular_game_end()) {
			return QUIT;
		}
		const bool is_victory = get_end_level_data_const().is_victory;

		if(this->gamestate_.gamedata_.phase() <= game_data::PRESTART) {
			sdl::draw_solid_tinted_rectangle(
				0, 0, gui_->video().getx(), gui_->video().gety(), 0, 0, 0, 1.0,
				gui_->video().getSurface()
				);
			update_rect(0, 0, gui_->video().getx(), gui_->video().gety());
		}

		ai_testing::log_game_end();

		const end_level_data& end_level = get_end_level_data_const();
		if (!end_level.transient.custom_endlevel_music.empty()) {
			if (!is_victory) {
				set_defeat_music_list(end_level.transient.custom_endlevel_music);
			} else {
				set_victory_music_list(end_level.transient.custom_endlevel_music);
			}
		}

		if (gamestate_.board_.teams().empty())
		{
			//store persistent teams
			saved_game_.set_snapshot(config());

			return VICTORY; // this is probably only a story scenario, i.e. has its endlevel in the prestart event
		}
		if(linger_) {
			LOG_NG << "resuming from loaded linger state...\n";
			//as carryover information is stored in the snapshot, we have to re-store it after loading a linger state
			saved_game_.set_snapshot(config());
			if(!is_observer()) {
				persist_.end_transaction();
			}
			return VICTORY;
		}
		pump().fire(is_victory ? "victory" : "defeat");
		{ // Block for set_scontext_synced_base
			set_scontext_synced_base sync;
			pump().fire("scenario_end");
		}
		if(end_level.proceed_to_next_level) {
			gamestate_.board_.heal_all_survivors();
		}
		if(is_observer()) {
			gui2::show_transient_message(gui_->video(), _("Game Over"), _("The game is over."));
			return OBSERVER_END;
		}
		// If we're a player, and the result is victory/defeat, then send
		// a message to notify the server of the reason for the game ending.
		network::send_data(config_of
			("info", config_of
				("type", "termination")
				("condition", "game over")
				("result", is_victory ? "victory" : "defeat")
			));
		// Play victory music once all victory events
		// are finished, if we aren't observers.
		//
		// Some scenario authors may use 'continue'
		// result for something that is not story-wise
		// a victory, so let them use [music] tags
		// instead should they want special music.
		const std::string& end_music = is_victory ? select_victory_music() : select_defeat_music();
		if(end_music.empty() != true) {
			sound::play_music_once(end_music);
		}
		persist_.end_transaction();
		return is_victory ? VICTORY : DEFEAT;
	} catch(const game::load_game_exception &) {
		// Loading a new game is effectively a quit.
		//
		if ( game::load_game_exception::game != "" ) {
			saved_game_ = saved_game();
		}
		throw;
	} catch(network::error& e) {
		bool disconnect = false;
		if(e.socket) {
			e.disconnect();
			disconnect = true;
		}

		update_savegame_snapshot();
		savegame::ingame_savegame save(saved_game_, *gui_, preferences::save_compression_format());
		save.save_game_interactive(gui_->video(), _("A network disconnection has occurred, and the game cannot continue. Do you want to save the game?"), gui::YES_NO);
		if(disconnect) {
			throw network::error();
		} else {
			return QUIT;
		}
	}

	return QUIT;
}

possible_end_play_signal playsingle_controller::play_turn()
{
	whiteboard_manager_->on_gamestate_change();
	gui_->new_turn();
	gui_->invalidate_game_status();
	events::raise_draw_event();

	LOG_NG << "turn: " << turn() << "\n";

	if(non_interactive()) {
		LOG_AIT << "Turn " << turn() << ":" << std::endl;
	}

	for (player_number_ = first_player_; player_number_ <= int(gamestate_.board_.teams().size()); ++player_number_)
	{
		// If a side is empty skip over it.
		if (current_team().is_empty()) continue;

		possible_end_play_signal signal;
		{
			save_blocker blocker;
			init_side_begin(false);
			if(init_side_done_) {
				init_side_end();
			}
			loading_game_ = false;
		}

		ai_testing::log_turn_start(player_number_);
		PROPOGATE_END_PLAY_SIGNAL ( play_side() );
		HANDLE_END_PLAY_SIGNAL(finish_side_turn());

		if(non_interactive()) {
			LOG_AIT << " Player " << player_number_ << ": " <<
				current_team().villages().size() << " Villages" <<
				std::endl;
			ai_testing::log_turn_end(player_number_);
		}
	}
	//If the loop exits due to the last team having been processed,
	//player_number_ will be 1 too high
	//TODO: Why else could the loop exit?
	if(player_number_ > static_cast<int>(gamestate_.board_.teams().size()))
		player_number_ = gamestate_.board_.teams().size();

	finish_turn();

	// Time has run out
	PROPOGATE_END_PLAY_SIGNAL ( check_time_over() );
	return boost::none;
}

possible_end_play_signal playsingle_controller::play_idle_loop()
{
	while(!end_turn_ && !player_type_changed_) {
		HANDLE_END_PLAY_SIGNAL( play_slice() );
		gui_->draw();
		SDL_Delay(10);
	}
	return boost::none;
}

possible_end_play_signal playsingle_controller::play_side()
{
	//check for team-specific items in the scenario
	gui_->parse_team_overlays();

	try {
		maybe_do_init_side();
	} catch (end_level_exception & e) {
		return possible_end_play_signal(e.to_struct());
	}
	//flag used when we fallback from ai and give temporarily control to human
	bool temporary_human = false;
	do {
		//Update viewing team in case it has changed during the loop.
		if(int side_num = play_controller::find_last_visible_team()) {
			if(side_num != this->gui_->viewing_side()) {
				update_gui_to_player(side_num - 1);
			}
		}
		// This flag can be set by derived classes (in overridden functions).
		player_type_changed_ = false;
		if (!skip_next_turn_)
			end_turn_ = false;

		statistics::reset_turn_stats(gamestate_.board_.teams()[player_number_ - 1].save_id());

		if((current_team().is_local_human() && current_team().is_proxy_human()) || temporary_human) {
			LOG_NG << "is human...\n";
			temporary_human = false;
			// If a side is dead end the turn, but play at least side=1's
			// turn in case all sides are dead
			if (gamestate_.board_.side_units(player_number_) != 0
				|| (gamestate_.board_.units().size() == 0 && player_number_ == 1))
			{
				before_human_turn();
				if (!end_turn_) {
					if(possible_end_play_signal signal = play_idle_loop()) {
						return signal;
					}
				}
			}

			if ( !player_type_changed_ )
				after_human_turn();
			LOG_NG << "human finished turn...\n";

		} else if(current_team().is_local_ai() || (current_team().is_local_human() && current_team().is_droid())) {
			try {
				play_ai_turn();
			} catch(fallback_ai_to_human_exception&) {
				// Give control to a human for this turn.
				player_type_changed_ = true;
				temporary_human = true;
			} catch (end_level_exception &e) {
				return possible_end_play_signal(e.to_struct());
			}
			if(!player_type_changed_)
			{
				recorder.end_turn();
			}

		} else if(current_team().is_network()) {
			PROPOGATE_END_PLAY_SIGNAL( play_network_turn() );
		} else if(current_team().is_local_human() && current_team().is_idle()) {
			end_turn_enable(false);
			do_idle_notification();
			before_human_turn();
			if (!end_turn_) {
				if(possible_end_play_signal signal = play_idle_loop()) {
					return signal;
				}
			}
		}
		else {
			assert(current_team().is_empty()); // Do nothing.
		}

	} while (player_type_changed_);
	// Keep looping if the type of a team (human/ai/networked)
	// has changed mid-turn
	skip_next_turn_ = false;
	return boost::none;
}

void playsingle_controller::before_human_turn()
{
	log_scope("player turn");
	linger_ = false;
	if(end_turn_) {
		return;
	}
	//TODO: why do we need the next line?
	ai::manager::raise_turn_started();

	if(do_autosaves_ && !is_regular_game_end()) {
		update_savegame_snapshot();
		savegame::autosave_savegame save(saved_game_, *gui_, preferences::save_compression_format());
		save.autosave(game_config::disable_autosave, preferences::autosavemax(), preferences::INFINITE_AUTO_SAVES);
	}

	if(preferences::turn_bell() && !is_regular_game_end()) {
		sound::play_bell(game_config::sounds::turn_bell);
	}
}

void playsingle_controller::show_turn_dialog(){
	if(preferences::turn_dialog() && !is_regular_game_end() ) {
		blindfold b(*gui_, true); //apply a blindfold for the duration of this dialog
		gui_->redraw_everything();
		gui_->recalculate_minimap();
		std::string message = _("It is now $name|’s turn");
		utils::string_map symbols;
		symbols["name"] = gamestate_.board_.teams()[player_number_ - 1].current_player();
		message = utils::interpolate_variables_into_string(message, &symbols);
		gui2::show_transient_message(gui_->video(), "", message);
	}
}

void playsingle_controller::execute_gotos(){
	menu_handler_.execute_gotos(mouse_handler_, player_number_);
}

possible_end_play_signal playsingle_controller::play_human_turn() {
	show_turn_dialog();

	if (!preferences::disable_auto_moves()) {
		HANDLE_END_PLAY_SIGNAL(execute_gotos());
	}

	end_turn_enable(true);
	while(!end_turn_ && !player_type_changed_) {
		HANDLE_END_PLAY_SIGNAL( play_slice() );
		gui_->draw();
	}

	return boost::none;
}

void playsingle_controller::linger()
{
	LOG_NG << "beginning end-of-scenario linger\n";
	linger_ = true;

	// If we need to set the status depending on the completion state
	// the key to it is here.
	gui_->set_game_mode(game_display::LINGER_SP);

	// change the end-turn button text to its alternate label
	gui_->get_theme().refresh_title2("button-endturn", "title2");
	gui_->invalidate_theme();
	gui_->redraw_everything();

	// End all unit moves
	gamestate_.board_.set_all_units_user_end_turn();
	try {
		// Same logic as single-player human turn, but
		// *not* the same as multiplayer human turn.
		end_turn_enable(true);
		end_turn_ = false;
		while(!end_turn_) {
			// Reset the team number to make sure we're the right team.
			player_number_ = first_player_;
			play_slice();
			gui_->draw();
		}
	} catch(const game::load_game_exception &) {
		// Loading a new game is effectively a quit.
		if ( game::load_game_exception::game != "" ) {
			saved_game_ = saved_game();
		}
		throw;
	}

	// revert the end-turn button text to its normal label
	gui_->get_theme().refresh_title2("button-endturn", "title");
	gui_->invalidate_theme();
	gui_->redraw_everything();
	gui_->set_game_mode(game_display::RUNNING);

	LOG_NG << "ending end-of-scenario linger\n";
}

void playsingle_controller::end_turn_enable(bool enable)
{
	gui_->enable_menu("endturn", enable);
	get_hotkey_command_executor()->set_button_state(*gui_);
}


void playsingle_controller::after_human_turn()
{
	// Mark the turn as done.
	if (!linger_)
	{
		recorder.end_turn();
	}

	// Clear moves from the GUI.
	gui_->set_route(NULL);
	gui_->unhighlight_reach();
}

void playsingle_controller::play_ai_turn()
{
	LOG_NG << "is ai...\n";

	end_turn_enable(false);
	gui_->recalculate_minimap();

	const cursor::setter cursor_setter(cursor::WAIT);

	// Correct an oddball case where a human could have left delayed shroud
	// updates on before giving control to the AI. (The AI does not bother
	// with the undo stack, so it cannot delay shroud updates.)
	team & cur_team = current_team();
	if ( !cur_team.auto_shroud_updates() ) {
		// We just took control, so the undo stack is empty. We still need
		// to record this change for the replay though.
		synced_context::run_in_synced_context("auto_shroud", replay_helper::get_auto_shroud(true));
	}
	undo_stack_->clear();

	turn_data_.send_data();
	try {
		ai::manager::play_turn(player_number_);
	}
	catch(...) {
		turn_data_.sync_network();
		throw;
	}
	turn_data_.sync_network();
	gui_->recalculate_minimap();
	gui_->invalidate_unit();
	gui_->invalidate_game_status();
	gui_->invalidate_all();
	gui_->draw();
	gui_->delay(100);
}


/**
 * Will handle sending a networked notification in descendent classes.
 */
void playsingle_controller::do_idle_notification()
{
	gui_->get_chat_manager().add_chat_message(time(NULL), "Wesnoth", 0,
		"This side is in an idle state. To proceed with the game, the host must assign it to another controller.",
		events::chat_handler::MESSAGE_PUBLIC, false);
}

/**
 * Will handle networked turns in descendent classes.
 */
possible_end_play_signal playsingle_controller::play_network_turn()
{
	// There should be no networked sides in single-player.
	ERR_NG << "Networked team encountered by playsingle_controller." << std::endl;
	return boost::none;
}


void playsingle_controller::handle_generic_event(const std::string& name){
	if (name == "ai_user_interact"){
		play_slice(false);
	}
}

possible_end_play_signal playsingle_controller::check_time_over(){
	bool time_left = gamestate_.tod_manager_.next_turn(gamestate_.gamedata_);
	it_is_a_new_turn_ = true;
	if(!time_left) {
		LOG_NG << "firing time over event...\n";
		set_scontext_synced_base sync;
		pump().fire("time over");
		LOG_NG << "done firing time over event...\n";
		//if turns are added while handling 'time over' event
		if (gamestate_.tod_manager_.is_time_left()) {
			return boost::none;
		}

		if(non_interactive()) {
			LOG_AIT << "time over (draw)\n";
			ai_testing::log_draw();
		}

		HANDLE_END_PLAY_SIGNAL( check_victory() );
		end_level_data e;
		e.proceed_to_next_level = false;
		e.is_victory = false;
		set_end_level_data(e);
		end_level_struct els  = { false };
		return possible_end_play_signal (els);
	}
	return boost::none;
}

void playsingle_controller::end_turn(){
	if (linger_)
		end_turn_ = true;
	else if (!is_browsing()){
		end_turn_ = menu_handler_.end_turn(player_number_);
	}
}

void playsingle_controller::force_end_turn(){
	skip_next_turn_ = true;
	end_turn_ = true;
}

void playsingle_controller::check_end_level()
{
	if (!is_regular_game_end() || linger_)
	{
		const team &t = gamestate_.board_.teams()[gui_->viewing_team()];
		if (!is_browsing() && t.objectives_changed()) {
			dialogs::show_objectives(get_scenario_name().str(), t.objectives());
			t.reset_objectives_changed();
		}
		return;
	}
	throw end_level_exception();
}


bool playsingle_controller::is_host() const
{
	return turn_data_.is_host();
}

void playsingle_controller::maybe_linger()
{
	// mouse_handler expects at least one team for linger mode to work.
	assert(is_regular_game_end());
	if (get_end_level_data_const().transient.linger_mode && !gamestate_.board_.teams().empty()) {
		linger();
	}
}