/*
 * 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 Public 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 Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

module mod_vtm_helfer
	{
		
		/**
		 * @author kcf <vidofnir@folksprak.org>
		 */
		export class klasse_hashmap<typ_schluessel, typ_wert>
			{
				
				/**
				 * @author kcf <vidofnir@folksprak.org>
				 */
				private hashfunction : (schluessel : typ_schluessel)=>string;
				
				
				/**
				 * @author kcf <vidofnir@folksprak.org>
				 */
				private speicher : {[hashwert : string] : {schluessel : typ_schluessel; wert : typ_wert;}};
				
				
				/**
				 * @author kcf <vidofnir@folksprak.org>
				 */
				public constructor(hashfunction : (schluessel : typ_schluessel)=>string)
					{
						this.hashfunction = hashfunction;
						this.speicher = {};
					}
				
				
				/**
				 * @author kcf <vidofnir@folksprak.org>
				 */
				public setzen(schluessel : typ_schluessel, wert : typ_wert) : void
					{
						let hashwert : string = this.hashfunction(schluessel);
						this.speicher[hashwert] = {"schluessel": schluessel, "wert": wert};
					}
				
				
				/**
				 * @author kcf <vidofnir@folksprak.org>
				 */
				public holen(schluessel : typ_schluessel) : schnittstelle_fehlermonade<typ_wert>
					{
						let hashwert : string = this.hashfunction(schluessel);
						if (hashwert in this.speicher)
							{
								let wert : typ_wert = this.speicher[hashwert].wert;
								return (new klasse_schlicht<typ_wert>(wert));
							}
						else
							{
								return (new klasse_nichts<typ_wert>());
							}
					}
				
				
				/**
				 * @author kcf <vidofnir@folksprak.org>
				 */
				public iterieren(prozedur : (schluessel ?: typ_schluessel, wert ?: typ_wert)=>void) : void
					{
						Object.keys(this.speicher).forEach
							(
								(hashwert) =>
									{
										let paar : {schluessel : typ_schluessel; wert : typ_wert;} = this.speicher[hashwert];
										prozedur(paar.schluessel, paar.wert);
									}
							)
						;
					}
				
			}
		
	}