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/*
 * Copyright (C) Inria Sophia Antipolis - Méditerranée / LIRMM
 * (Université de Montpellier & CNRS) (2014 - 2016)
 *
 * Contributors :
 *
 * Clément SIPIETER 
 * Mélanie KÖNIG
 * Swan ROCHER
 * Jean-François BAGET
 * Michel LECLÈRE
 * Marie-Laure MUGNIER 
 *
 *
 * This file is part of Graal .
 *
 * This software is governed by the CeCILL  license under French law and
 * abiding by the rules of distribution of free software.  You can  use,
 * modify and/ or redistribute the software under the terms of the CeCILL
 * license as circulated by CEA, CNRS and INRIA at the following URL
 * "http://www.cecill.info".
 *
 * As a counterpart to the access to the source code and  rights to copy,
 * modify and redistribute granted by the license, users are provided only
 * with a limited warranty  and the software's author,  the holder of the
 * economic rights,  and the successive licensors  have only  limited
 * liability.
 *
 * In this respect, the user's attention is drawn to the risks associated
 * with loading,  using,  modifying and/or developing or reproducing the
 * software by the user in light of its specific status of free software,
 * that may mean  that it is complicated to manipulate,  and  that  also
 * therefore means  that it is reserved for developers  and  experienced
 * professionals having in-depth computer knowledge. Users are therefore
 * encouraged to load and test the software's suitability as regards their
 * requirements in conditions enabling the security of their systems and/or
 * data to be ensured and,  more generally, to use and operate it in the
 * same conditions as regards security.
 *
 * The fact that you are presently reading this means that you have had
 * knowledge of the CeCILL license and that you accept its terms.
 */
package fr.lirmm.graphik.graal.io.sparql;

import com.hp.hpl.jena.graph.Node;
import com.hp.hpl.jena.graph.Triple;

import fr.lirmm.graphik.graal.api.core.Atom;
import fr.lirmm.graphik.graal.api.core.Predicate;
import fr.lirmm.graphik.graal.api.core.Term;
import fr.lirmm.graphik.graal.api.io.ParseError;
import fr.lirmm.graphik.graal.core.factory.DefaultAtomFactory;
import fr.lirmm.graphik.graal.core.term.DefaultTermFactory;
import fr.lirmm.graphik.util.URIUtils;

/**
 * @author Clément Sipieter (INRIA) {@literal }
 *
 */
final class SparqlUtils {

	private SparqlUtils() {
	}

	// /////////////////////////////////////////////////////////////////////////
	// PUBLIC METHODS
	// /////////////////////////////////////////////////////////////////////////

	public static Atom triple2Atom(Triple triple) {
		Node subject = triple.getSubject();
		Node object = triple.getObject();
		Node predicate = triple.getPredicate();
		if (predicate.getURI().equals(URIUtils.RDF_TYPE.toString())) {
			return DefaultAtomFactory.instance().create(node2Predicate(object, 1), node2Term(subject));
		} else {
			return DefaultAtomFactory.instance().create(node2Predicate(predicate, 2), node2Term(subject),
			    node2Term(object));
		}
	}

	/**
	 * @param node
	 * @return
	 */
	public static Term node2Term(Node node) {
		Term term;
		if (node.isURI()) {
			term = DefaultTermFactory.instance().createConstant(URIUtils.createURI(node.getURI()));
		} else if (node.isLiteral()) {
			if (node.getLiteralValue() instanceof String) {
				// FIXME Jena ARQ Bug fix
				term = DefaultTermFactory.instance().createLiteral(URIUtils.XSD_STRING, node.getLiteralValue());
			} else {
				term = DefaultTermFactory.instance().createLiteral(URIUtils.createURI(node.getLiteralDatatypeURI()),
				    node.getLiteralValue());
			}
		} else if (node.isVariable()) {
			term = DefaultTermFactory.instance().createVariable(node.getName());
		} else if (node.isBlank()) {
			term = DefaultTermFactory.instance().createVariable(node.getBlankNodeLabel());
		} else {
			throw new ParseError("Unknow error on " + node);
		}
		return term;
	}

	public static Predicate node2Predicate(Node node, int arity) {
		Predicate predicate;
		if (node.isURI()) {
			predicate = new Predicate(URIUtils.createURI(node.getURI()), arity);
		} else {
			throw new ParseError("Unknow error on " + node);
		}
		return predicate;
	}

}