/*
    * #%L
    * prolobjectlink-jpi-jtrolog
    * %%
    * Copyright (C) 2019 Prolobjectlink Project
    * %%
    * This program 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 2.1 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 Lesser Public License for more details.
   * 
   * You should have received a copy of the GNU General Lesser Public
   * License along with this program.  If not, see
   * <http://www.gnu.org/licenses/lgpl-2.1.html>.
   * #L%
   */
  package io.github.prolobjectlink.prolog.jtrolog;
  
  import static io.github.prolobjectlink.prolog.PrologTermType.STRUCTURE_TYPE;
  
  import io.github.prolobjectlink.prolog.PrologProvider;
  import io.github.prolobjectlink.prolog.PrologStructure;
  import io.github.prolobjectlink.prolog.PrologTerm;
  import jTrolog.parser.Parser;
  import jTrolog.terms.Struct;
  import jTrolog.terms.Term;
  
  /**
   * 
   * @author Jose Zalacain
   * @since 1.0
   */
  class JTrologStructure extends JTrologTerm implements PrologStructure {
  
  	JTrologStructure(PrologProvider provider, String functor, PrologTerm... arguments) {
  		super(STRUCTURE_TYPE, provider);
  		Term[] terms = new Term[arguments.length];
  		for (int i = 0; i < arguments.length; i++) {
  			terms[i] = ((JTrologTerm) arguments[i]).value;
  		}
  		value = new Struct(functor, terms);
  	}
  
  	JTrologStructure(PrologProvider provider, String functor, Term... arguments) {
  		super(STRUCTURE_TYPE, provider, new Struct(functor, arguments));
  	}
  
  	JTrologStructure(PrologProvider provider, PrologTerm left, String operator, PrologTerm right) {
  		super(STRUCTURE_TYPE, provider);
  		Term leftOperand = ((JTrologTerm) left).value;
  		Term rightOperand = ((JTrologTerm) right).value;
  		value = new Struct(operator, new Term[] { leftOperand, rightOperand });
  	}
  
  	JTrologStructure(PrologProvider provider, Term left, String functor, Term right) {
  		super(STRUCTURE_TYPE, provider, new Struct(functor, new Term[] { left, right }));
  	}
  
  	public PrologTerm getArgument(int index) {
  		checkIndex(index, getArity());
  		return getArguments()[index];
  	}
  
  	public PrologTerm[] getArguments() {
  		Struct structure = (Struct) value;
  		int arity = structure.arity;
  		PrologTerm[] arguments = new PrologTerm[arity];
  		for (int i = 0; i < arity; i++) {
  			arguments[i] = provider.toTerm(structure.getArg(i), PrologTerm.class);
  		}
  		return arguments;
  	}
  
  	public int getArity() {
  		Struct structure = (Struct) value;
  		return structure.arity;
  	}
  
  	public String getFunctor() {
  		Struct structure = (Struct) value;
  		if (ops.currentOp(structure.name)) {
  			return structure.name;
  		}
  		return Parser.wrapAtom(structure.name);
  	}
  
  	public final PrologTerm getRight() {
  		return getArgument(1);
  	}
  
  	public final PrologTerm getLeft() {
  		return getArgument(0);
  	}
  
 	public final String getOperator() {
 		return getFunctor();
 	}
 
 }