/*
 * Verrückte Turing-Maschinen — A turing complete game
 * Copyright (C) 2016 Christian Fraß <vidofnir@folksprak.org>
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General export function aktor_leser_License as published by
 * the Free Software Foundation, either version 3 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; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General export function aktor_leser_License for more details.
 * 
 * You should have received a copy of the GNU General export function aktor_leser_License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

module mod_vtm_aufbau
	{
		
		/**
		 * @author kcf <vidofnir@folksprak.org>
		 */
		export type typ_aktor_leser =
			{
				"richtung": typ_richtung,
				"symbol_links": typ_symbol,
				"symbol_rechts": typ_symbol,
			}
		;
		
		
		/**
		 * @author kcf <vidofnir@folksprak.org>
		 */
		export function aktor_leser_erstellen(richtung : typ_richtung = 0, symbol_links : typ_symbol = 0, symbol_rechts : typ_symbol = 1) : typ_aktor_leser
			{
				return {
					"richtung": richtung,
					"symbol_links": symbol_links,
					"symbol_rechts": symbol_rechts,
				};
			}
		
		
		/**
		 * @author kcf <vidofnir@folksprak.org>
		 */
		export function aktor_leser_richtung_lesen(aktor_leser : typ_aktor_leser) : typ_richtung
			{
				return aktor_leser.richtung;
			}
		
		
		/**
		 * @author kcf <vidofnir@folksprak.org>
		 */
		export function aktor_leser_symbol_links_lesen(aktor_leser : typ_aktor_leser) : typ_symbol
			{
				return aktor_leser.symbol_links;
			}
		
		
		/**
		 * @author kcf <vidofnir@folksprak.org>
		 */
		export function aktor_leser_symbol_rechts_lesen(aktor_leser : typ_aktor_leser) : typ_symbol
			{
				return aktor_leser.symbol_rechts;
			}
		
		
		/**
		 * @author kcf <vidofnir@folksprak.org>
		 */
		export function aktor_leser_drehen(aktor_leser : typ_aktor_leser, inkrement : int = +1) : void
			{
				aktor_leser.richtung = richtung_addieren(aktor_leser.richtung, inkrement);
			}
		
		
		/**
		 * @author kcf <vidofnir@folksprak.org>
		 */
		export function aktor_leser_verwenden(aktor_leser : typ_aktor_leser, figur : typ_figur) : void
			{
				let symbol_ : schnittstelle_fehlermonade<typ_symbol> = figur_lesen(figur);
				let summand : typ_richtung;
				if (symbol_.ist_schlicht())
					{
						let symbol : typ_symbol = symbol_.lesen();
						     if (symbol === aktor_leser.symbol_links)
							{
								figur_schieben(figur);
								summand = +2;
							}
						else if (symbol === aktor_leser.symbol_rechts)
							{
								figur_schieben(figur);
								summand = -2;
							}
						else
							{
								summand = 0;
							}
					}
				else
					{
						summand = 0;
					}
				let richtung : typ_richtung = richtung_addieren(aktor_leser.richtung, summand);
				figur_bewegen(figur, richtung);
			}
		
		
		/**
		 * @author kcf <vidofnir@folksprak.org>
		 */
		export function aktor_leser_exportieren(aktor_leser : typ_aktor_leser) : any
			{
				return {
					"richtung": richtung_exportieren(aktor_leser.richtung),
					"symbol_links": symbol_exportieren(aktor_leser.symbol_links),
					"symbol_rechts": symbol_exportieren(aktor_leser.symbol_rechts),
				};
			}
		
		
		/**
		 * @author kcf <vidofnir@folksprak.org>
		 */
		export function aktor_leser_importieren(roh : any) : typ_aktor_leser
			{
				return (
					aktor_leser_erstellen
						(
							richtung_importieren(roh["richtung"]),
							symbol_importieren(roh["symbol_links"]),
							symbol_importieren(roh["symbol_rechts"])
						)
				);
			}
		
	}