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/*
 *  This file is part of "TweetyProject", a collection of Java libraries for
 *  logical aspects of artificial intelligence and knowledge representation.
 *
 *  TweetyProject is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License version 3 as
 *  published by the Free Software Foundation.
 *
 *  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 Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program. If not, see .
 *
 *  Copyright 2016 The TweetyProject Team 
 */
package net.sf.tweety.lp.nlp.syntax;

import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import net.sf.tweety.commons.util.rules.RuleSet;
import net.sf.tweety.logics.commons.syntax.interfaces.LogicProgram;
import net.sf.tweety.logics.commons.syntax.interfaces.Term;
import net.sf.tweety.logics.fol.syntax.FolFormula;
import net.sf.tweety.logics.fol.syntax.FolSignature;

/**
 * A nested logic program
 * @author Tim Janus
 */
public class NLPProgram 
	extends RuleSet 
	implements LogicProgram {
	
	/** kill warning */
	private static final long serialVersionUID = 1050122194243070233L;

	/**
	 * @return	A set of facts as FOL formulas
	 */
	public Set getFacts() {
		Set reval = new HashSet();
		for(NLPRule rule : this) {
			if(rule.isFact()) {
				reval.add(rule.getConclusion());
			}
		}
		return reval;
	}
	
	@Override
	public void addFact(FolFormula fact) {
		this.add(new NLPRule(fact));
	}
	
	
	@Override
	public FolSignature getMinimalSignature() {
		FolSignature reval = new FolSignature();
		for(NLPRule rule : this) {
			reval.addSignature(rule.getSignature());
		}
		return reval;
	}

	@Override
	public NLPProgram substitute(Term t, Term v) {
		NLPProgram reval = new NLPProgram();
		for(NLPRule rule : this) {
			reval.add(rule.substitute(t, v));
		}
		return reval;
	}
	
	@Override
	public NLPProgram substitute(
			Map, ? extends Term> map)
			throws IllegalArgumentException {
		NLPProgram reval = this;
		for(Term t : map.keySet()) {
			reval = reval.substitute(t, map.get(t));
		}
		return reval;
	}

	@Override
	public NLPProgram exchange(Term v, Term t)
			throws IllegalArgumentException {
		NLPProgram reval = new NLPProgram();
		for(NLPRule rule : this) {
			reval.add((NLPRule)rule.exchange(t, v));
		}
		return reval;
	}
}