/**
    * 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 java.util.List;
  
  import cz.cuni.amis.pogamut.base3d.worldview.object.Velocity;
  import cz.cuni.amis.pogamut.ut2004.utils.UnrealUtils;
  import eis.eis2java.exception.TranslationException;
  import eis.eis2java.translation.Java2Parameter;
  import eis.eis2java.translation.Parameter2Java;
  import eis.iilang.Function;
  import eis.iilang.Numeral;
  import eis.iilang.Parameter;
  
  
  public class VelocityTranslator implements Java2Parameter<Velocity>, Parameter2Java<Velocity> {
  
  	public static final String VELOCITY_KEYWORD = "velocity";
  
  	@Override
  	public Parameter[] translate(Velocity o) throws TranslationException {
  		return new Parameter[] { new Function(VELOCITY_KEYWORD,
  				new Numeral(UnrealUtils.unrealDegreeToDegree((int) o.getX())),
  				new Numeral(UnrealUtils.unrealDegreeToDegree((int) o.getY())),
  				new Numeral(UnrealUtils.unrealDegreeToDegree((int) o.getZ())) )
  			};
  	}
  
  	@Override
  	public Class<? extends Velocity> translatesFrom() {
  		return Velocity.class;
  	}
  
  	@Override
  	public Velocity translate(Parameter p) throws TranslationException {
  
  		if (!(p instanceof Function)) {
  			String message = String.format("A velocity must be a function, received: %s.", p);
  			throw new TranslationException(message);
  		}
  
  		Function f = (Function) p;
  
  		// Check function name
  		if (!f.getName().equals(VELOCITY_KEYWORD)) {
  			String message = String.format("A velocity needs to start with %s, not: %s in %s.", VELOCITY_KEYWORD,
  					f.getName(), f);
  			throw new TranslationException(message);
  		}
  		List<Parameter> parameters = f.getParameters();
  
  		// Check number of parameters
  		if (parameters.size() != 3) {
  			String message = String.format("Expected exactly 3 parameters when parsing %s", f);
  			throw new TranslationException(message);
  		}
  
  		// Check type of parameters
  		for (Parameter parameter : parameters) {
  			if (!(parameter instanceof Numeral)) {
  				String message = String.format("All arguments of %s should be numerical.", f);
  				throw new TranslationException(message);
  			}
  		}
  
  		// Transform to location.
  		double[] c = new double[3];
  		for (int i = 0; i < c.length; i++) {
  			Parameter parameter = parameters.get(i);
  			c[i] = ((Numeral) parameter).getValue().doubleValue();
  		}
  		return new Velocity(c[0], c[1], c[2]);
  
  	}
  
  	@Override
  	public Class<Velocity> translatesTo() {
  		return Velocity.class;
  
  	}
  
 }