/*
 * Copyright (C) 2018 Matthias Heizmann (heizmann@informatik.uni-freiburg.de)
 * Copyright (C) 2018 University of Freiburg
 *
 * This file is part of the ULTIMATE Automata Library.
 *
 * The ULTIMATE Automata Library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * The ULTIMATE Automata Library 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 the ULTIMATE Automata Library. If not, see <http://www.gnu.org/licenses/>.
 *
 * Additional permission under GNU GPL version 3 section 7:
 * If you modify the ULTIMATE Automata Library, or any covered work, by linking
 * or combining it with Eclipse RCP (or a modified version of Eclipse RCP),
 * containing parts covered by the terms of the Eclipse Public License, the
 * licensors of the ULTIMATE Automata Library grant you additional permission
 * to convey the resulting work.
 */
package de.uni_freiburg.informatik.ultimate.automata.petrinet.operations;

import de.uni_freiburg.informatik.ultimate.automata.AutomataLibraryException;
import de.uni_freiburg.informatik.ultimate.automata.AutomataLibraryServices;
import de.uni_freiburg.informatik.ultimate.automata.GeneralOperation;
import de.uni_freiburg.informatik.ultimate.automata.Word;
import de.uni_freiburg.informatik.ultimate.automata.nestedword.INestedWordAutomaton;
import de.uni_freiburg.informatik.ultimate.automata.petrinet.IPetriNet;
import de.uni_freiburg.informatik.ultimate.automata.petrinet.IPetriNetAndAutomataInclusionStateFactory;
import de.uni_freiburg.informatik.ultimate.automata.statefactory.IStateFactory;

/**
 * Compare the languages of a given {@link IPetriNet} and a given {@link INestedWordAutomaton} wrt inclusion. Supports
 * both directions via two different constructors.
 *
 * @author Matthias Heizmann (heizmann@informatik.uni-freiburg.de)
 */
public class IsIncluded<LETTER, STATE> extends GeneralOperation<LETTER, STATE, IStateFactory<STATE>> {
	private final IPetriNet<LETTER, STATE> mPetriNet;
	private final INestedWordAutomaton<LETTER, STATE> mAutomaton;
	private final boolean mResult;
	private final Word<LETTER> mCounterexample;

	/**
	 * Check if language of Petri net is included in language of automaton.
	 */
	public IsIncluded(final AutomataLibraryServices services,
			final IPetriNetAndAutomataInclusionStateFactory<STATE> stateFactory,
			final IPetriNet<LETTER, STATE> petriNet, final INestedWordAutomaton<LETTER, STATE> automaton)
			throws AutomataLibraryException {
		super(services);
		mPetriNet = petriNet;
		mAutomaton = automaton;
		printStartMessage();
		final INestedWordAutomaton<LETTER, STATE> petriNetAsAutomaton =
				new PetriNet2FiniteAutomaton<>(mServices, stateFactory, mPetriNet).getResult();
		final de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.IsIncluded<LETTER, STATE> isIncluded =
				new de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.IsIncluded<>(mServices,
						stateFactory, petriNetAsAutomaton, mAutomaton);
		mResult = isIncluded.getResult();
		if (!mResult) {
			mCounterexample = isIncluded.getCounterexample().getWord();
		} else {
			mCounterexample = null;
		}
		printExitMessage();
	}

	/**
	 * Check if language of automaton is included in language of Petri net.
	 */
	public IsIncluded(final AutomataLibraryServices services,
			final IPetriNetAndAutomataInclusionStateFactory<STATE> stateFactory,
			final INestedWordAutomaton<LETTER, STATE> automaton, final IPetriNet<LETTER, STATE> petriNet)
			throws AutomataLibraryException {
		super(services);
		mPetriNet = petriNet;
		mAutomaton = automaton;
		printStartMessage();
		final INestedWordAutomaton<LETTER, STATE> petriNetAsAutomaton =
				new PetriNet2FiniteAutomaton<>(mServices, stateFactory, mPetriNet).getResult();
		final de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.IsIncluded<LETTER, STATE> isIncluded =
				new de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.IsIncluded<>(mServices,
						stateFactory, mAutomaton, petriNetAsAutomaton);
		mResult = isIncluded.getResult();
		if (!mResult) {
			mCounterexample = isIncluded.getCounterexample().getWord();
		} else {
			mCounterexample = null;
		}
		printExitMessage();
	}

	@Override
	public String exitMessage() {
		return "Finished " + getOperationName() + " language is " + (mResult ? "empty" : "not empty");
	}

	@Override
	public Boolean getResult() {
		return mResult;
	}

	public Word<LETTER> getCounterexample() {
		return mCounterexample;
	}

	@Override
	public boolean checkResult(final IStateFactory<STATE> stateFactory) throws AutomataLibraryException {
		mLogger.warn("Not yet implemented: result check for " + this.getClass().getSimpleName());
		return true;
	}
}