/**
    * BaseUnrealEnvironment, an implementation of the environment interface standard that 
    * facilitates the connection between GOAL and the UT2004 engine. 
    * 
    * Copyright (C) 2012 BaseUnrealEnvironment authors.
    * 
    * 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 <http://www.gnu.org/licenses/>.
   */
  package nl.tudelft.goal.unreal.translators;
  
  
  import nl.tudelft.goal.unreal.messages.ParameterMap;
  import eis.eis2java.exception.TranslationException;
  import eis.eis2java.translation.Parameter2Java;
  import eis.iilang.Identifier;
  import eis.iilang.Parameter;
  import eis.iilang.ParameterList;
  
  public class ParameterMapTranslator implements Parameter2Java<ParameterMap> {
  
  	// A map entry has a key and value, so a size of 2.
  	private static final int ENTRY_SIZE = 2; 
  
  	@Override
  	public ParameterMap translate(Parameter parameter) throws TranslationException {
  		if (!(parameter instanceof ParameterList)) {
  			String message = String.format("%s is not a parameter list.", parameter);
  			throw new TranslationException(message);
  		}
  		
  		return translateEntries((ParameterList) parameter);
  	}
  
  	private ParameterMap translateEntries(ParameterList parameterList) throws TranslationException {
  		ParameterMap map = new ParameterMap();
  
  		for (Parameter entry : parameterList) {
  			
  			if (!(entry instanceof ParameterList)) {
  				String message = String.format("%s is not a parameter list.", entry);
  				throw new TranslationException(message);
  			}
  			
  			ParameterList entryList = (ParameterList) entry;
  			
  			if (entryList.size() != ENTRY_SIZE) {
  				String message = String.format("Expected a parameter list with " + ENTRY_SIZE + " elements but received %s.", entryList);
  				throw new TranslationException(message);
  			}
  			
  			Parameter key = entryList.get(0);
  			Parameter value = entryList.get(1);
  			
  			if(!(key instanceof Identifier)){
  				String message = String.format("Expected an identifier but received %s.", key);
  				throw new TranslationException(message);
  			}
  
  			map.put((Identifier) key,value);
  		}
  
  		return map;
  	}
  
  	@Override
  	public Class<ParameterMap> translatesTo() {
  		return ParameterMap.class;
  	}
  
  }