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package nl.uu.cs.ape.models.sltlxStruc;

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

import nl.uu.cs.ape.solver.minisat.SATSynthesisEngine;

/**
 * Structure used to model Next operation (<Op>) modal statement in SLTLx.
 * 
 * @author Vedran Kasalica
 *
 */
public class SLTLxNextOp extends SLTLxFormula {

	private SLTLxFormula operation;
	private SLTLxFormula formula;

	public SLTLxNextOp(SLTLxFormula operation, SLTLxFormula formula) {
		super();
		this.operation = operation;
		this.formula = formula;
	}

	@Override
	public Set getCNFEncoding(int stateNo, SLTLxVariableSubstitutionCollection variableMapping,
			SATSynthesisEngine synthesisEngine) {
		if (synthesisEngine.getSolutionSize() <= stateNo) {
			return SLTLxAtom.getFalse().getCNFEncoding(stateNo, variableMapping, synthesisEngine);
		}

		Set> allClauses = new HashSet<>();

		/*
		 * Conjunct the collection of clauses that encode the operation and the formula
		 */
		allClauses.add(operation.getCNFEncoding(stateNo, variableMapping, synthesisEngine));
		allClauses.add(formula.getCNFEncoding(stateNo + 1, variableMapping, synthesisEngine));

		return CNFClause.conjunctClausesCollection(allClauses);
	}

	@Override
	public Set getNegatedCNFEncoding(int stateNo, SLTLxVariableSubstitutionCollection variableMapping,
			SATSynthesisEngine synthesisEngine) {
		if (synthesisEngine.getSolutionSize() <= stateNo) {
			return SLTLxAtom.getTrue().getCNFEncoding(stateNo, variableMapping, synthesisEngine);
		}
		Set> allClauses = new HashSet<>();

		/*
		 * Disjunction the collection of clauses that encode the negation of the
		 * operation and of the formula
		 */
		allClauses.add(operation.getNegatedCNFEncoding(stateNo, variableMapping, synthesisEngine));
		allClauses.add(formula.getNegatedCNFEncoding(stateNo + 1, variableMapping, synthesisEngine));

		return CNFClause.disjoinClausesCollection(allClauses);
	}

}