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A collection of basic algorithm for approximating equivalence queries
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/* Copyright (C) 2014 TU Dortmund
 * This file is part of LearnLib, http://www.learnlib.de/.
 * 
 * LearnLib is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License version 3.0 as published by the Free Software Foundation.
 * 
 * LearnLib 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 LearnLib; if not, see
 * .
 */
package de.learnlib.eqtests.basic;

import java.util.Collection;
import java.util.Collections;
import java.util.Objects;

import de.learnlib.api.EquivalenceOracle;
import de.learnlib.api.MembershipOracle;
import de.learnlib.oracles.DefaultQuery;

import net.automatalib.automata.UniversalDeterministicAutomaton;
import net.automatalib.automata.concepts.Output;
import net.automatalib.automata.fsa.DFA;
import net.automatalib.automata.transout.MealyMachine;
import net.automatalib.util.automata.conformance.IncrementalWMethodTestsIterator;
import net.automatalib.words.Alphabet;
import net.automatalib.words.Word;

public class IncrementalWMethodEQOracle & Output, I, D>
		implements EquivalenceOracle {
	
	public static class DFAIncrementalWMethodEQOracle
			extends IncrementalWMethodEQOracle, I, Boolean>
			implements DFAEquivalenceOracle {
		public DFAIncrementalWMethodEQOracle(Alphabet alphabet,
				MembershipOracle oracle, int maxDepth) {
			super(alphabet, oracle, maxDepth);
		}
		public DFAIncrementalWMethodEQOracle(Alphabet alphabet,
				MembershipOracle oracle) {
			super(alphabet, oracle);
		}
	}
	
	public static class MealyIncrementalWMethodEQOracle
			extends IncrementalWMethodEQOracle, I, Word>
			implements MealyEquivalenceOracle {
		public MealyIncrementalWMethodEQOracle(Alphabet alphabet,
				MembershipOracle> oracle, int maxDepth) {
			super(alphabet, oracle, maxDepth);
		}
		public MealyIncrementalWMethodEQOracle(Alphabet alphabet,
				MembershipOracle> oracle) {
			super(alphabet, oracle);
		}
	}
	
	@SuppressWarnings("unused")
	private final Alphabet alphabet;
	private final MembershipOracle oracle;
	private final IncrementalWMethodTestsIterator incrementalWMethodIt;
	
	private int maxDepth;
	
	public IncrementalWMethodEQOracle(Alphabet alphabet, MembershipOracle oracle) {
		this(alphabet, oracle, 1);
	}
	
	public IncrementalWMethodEQOracle(Alphabet alphabet, MembershipOracle oracle, int maxDepth) {
		this.alphabet = alphabet;
		this.oracle = oracle;
		this.incrementalWMethodIt = new IncrementalWMethodTestsIterator<>(alphabet);
		this.incrementalWMethodIt.setMaxDepth(maxDepth);
		
		this.maxDepth = maxDepth;
	}

	public int getMaxDepth() {
		return maxDepth;
	}
	
	public void setMaxDepth(int maxDepth) {
		this.maxDepth = maxDepth;
	}
	
	@Override
	public DefaultQuery findCounterExample(A hypothesis,
			Collection inputs) {
		// FIXME: warn about inputs being ignored?
		incrementalWMethodIt.update(hypothesis);
		
		while(incrementalWMethodIt.hasNext()) {
			Word testCase = incrementalWMethodIt.next();
			
			DefaultQuery query = new DefaultQuery<>(testCase);
			oracle.processQueries(Collections.singleton(query));
			D hypOut = hypothesis.computeOutput(testCase);
			if(!Objects.equals(query.getOutput(), hypOut)) {
				// found counterexample
				return query;
			}
		}
		
		return null;
	}
	
	

}