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/* This file is part of the OWL API.
 * The contents of this file are subject to the LGPL License, Version 3.0.
 * Copyright 2014, The University of Manchester
 * 
 * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 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 Public License for more details.
 * You should have received a copy of the GNU General Public License along with this program.  If not, see http://www.gnu.org/licenses/.
 *
 * Alternatively, the contents of this file may be used under the terms of the Apache License, Version 2.0 in which case, the provisions of the Apache License Version 2.0 are applicable instead of those above.
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. */
package uk.ac.manchester.cs.owl.owlapi;

import static org.semanticweb.owlapi.util.OWLAPIPreconditions.checkNotNull;

import java.io.IOException;
import java.lang.ref.WeakReference;
import java.util.Collection;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Set;

import javax.annotation.Nonnull;

import org.semanticweb.owlapi.model.AxiomType;
import org.semanticweb.owlapi.model.OWLAnnotation;
import org.semanticweb.owlapi.model.OWLAxiom;
import org.semanticweb.owlapi.model.OWLAxiomVisitor;
import org.semanticweb.owlapi.model.OWLAxiomVisitorEx;
import org.semanticweb.owlapi.model.OWLClassExpression;
import org.semanticweb.owlapi.model.OWLObject;
import org.semanticweb.owlapi.model.OWLObjectVisitor;
import org.semanticweb.owlapi.model.OWLObjectVisitorEx;
import org.semanticweb.owlapi.model.SWRLAtom;
import org.semanticweb.owlapi.model.SWRLBuiltInAtom;
import org.semanticweb.owlapi.model.SWRLClassAtom;
import org.semanticweb.owlapi.model.SWRLDataPropertyAtom;
import org.semanticweb.owlapi.model.SWRLDataRangeAtom;
import org.semanticweb.owlapi.model.SWRLDifferentIndividualsAtom;
import org.semanticweb.owlapi.model.SWRLIndividualArgument;
import org.semanticweb.owlapi.model.SWRLLiteralArgument;
import org.semanticweb.owlapi.model.SWRLObject;
import org.semanticweb.owlapi.model.SWRLObjectPropertyAtom;
import org.semanticweb.owlapi.model.SWRLObjectVisitor;
import org.semanticweb.owlapi.model.SWRLObjectVisitorEx;
import org.semanticweb.owlapi.model.SWRLRule;
import org.semanticweb.owlapi.model.SWRLSameIndividualAtom;
import org.semanticweb.owlapi.model.SWRLVariable;
import org.semanticweb.owlapi.util.CollectionFactory;
import org.semanticweb.owlapi.util.SWRLVariableExtractor;

/**
 * @author Matthew Horridge, The University Of Manchester, Bio-Health
 *         Informatics Group
 * @since 2.0.0
 */
public class SWRLRuleImpl extends OWLLogicalAxiomImplWithEntityAndAnonCaching
        implements SWRLRule {

    private static final long serialVersionUID = 40000L;
    private final LinkedHashSet head;
    private final LinkedHashSet body;
    private final boolean containsAnonymousClassExpressions;
    private transient WeakReference> variables = null;
    private transient WeakReference> classAtomsPredicates = null;

    private void readObject(java.io.ObjectInputStream stream)
            throws IOException, ClassNotFoundException {
        stream.defaultReadObject();
        variables = null;
        classAtomsPredicates = null;
    }

    /**
     * @param body
     *        rule body
     * @param head
     *        rule head
     * @param annotations
     *        annotations on the axiom
     */
    public SWRLRuleImpl(@Nonnull Set body,
            @Nonnull Set head,
            @Nonnull Collection annotations) {
        super(annotations);
        this.head = new LinkedHashSet<>(checkNotNull(head,
                "head cannot be null"));
        this.body = new LinkedHashSet<>(checkNotNull(body,
                "body cannot be null"));
        containsAnonymousClassExpressions = hasAnon();
    }

    @Override
    public SWRLRule getAxiomWithoutAnnotations() {
        if (!isAnnotated()) {
            return this;
        }
        return new SWRLRuleImpl(getBody(), getHead(), NO_ANNOTATIONS);
    }

    @Override
    public OWLAxiom getAnnotatedAxiom(@Nonnull Set annotations) {
        return new SWRLRuleImpl(getBody(), getHead(), annotations);
    }

    /**
     * @param body
     *        rule body
     * @param head
     *        rule head
     */
    public SWRLRuleImpl(@Nonnull Set body,
            @Nonnull Set head) {
        this(body, head, NO_ANNOTATIONS);
    }

    @Nonnull
    @Override
    public Set getVariables() {
        Set toReturn = null;
        if (variables != null) {
            toReturn = variables.get();
        }
        if (toReturn != null) {
            return toReturn;
        }
        SWRLVariableExtractor extractor = new SWRLVariableExtractor();
        accept(extractor);
        toReturn = extractor.getVariables();
        variables = new WeakReference<>(toReturn);
        return toReturn;
    }

    private boolean hasAnon() {
        for (SWRLAtom atom : head) {
            if (atom instanceof SWRLClassAtom
                    && ((SWRLClassAtom) atom).getPredicate().isAnonymous()) {
                return true;
            }
        }
        for (SWRLAtom atom : body) {
            if (atom instanceof SWRLClassAtom
                    && ((SWRLClassAtom) atom).getPredicate().isAnonymous()) {
                return true;
            }
        }
        return false;
    }

    @Override
    public boolean containsAnonymousClassExpressions() {
        return containsAnonymousClassExpressions;
    }

    @Override
    public Set getClassAtomPredicates() {
        Set toReturn = null;
        if (classAtomsPredicates != null) {
            toReturn = classAtomsPredicates.get();
        }
        if (toReturn != null) {
            return toReturn;
        }
        toReturn = new LinkedHashSet<>();
        for (SWRLAtom atom : head) {
            if (atom instanceof SWRLClassAtom) {
                toReturn.add(((SWRLClassAtom) atom).getPredicate());
            }
        }
        for (SWRLAtom atom : body) {
            if (atom instanceof SWRLClassAtom) {
                toReturn.add(((SWRLClassAtom) atom).getPredicate());
            }
        }
        classAtomsPredicates = new WeakReference<>(toReturn);
        return toReturn;
    }

    @Override
    public void accept(OWLObjectVisitor visitor) {
        visitor.visit(this);
    }

    @Override
    public  O accept(OWLObjectVisitorEx visitor) {
        return visitor.visit(this);
    }

    @Override
    public void accept(SWRLObjectVisitor visitor) {
        visitor.visit(this);
    }

    @Override
    public  O accept(SWRLObjectVisitorEx visitor) {
        return visitor.visit(this);
    }

    @Override
    public Set getBody() {
        return CollectionFactory
                .getCopyOnRequestSetFromImmutableCollection(body);
    }

    @Override
    public Set getHead() {
        return CollectionFactory
                .getCopyOnRequestSetFromImmutableCollection(head);
    }

    @Override
    public void accept(OWLAxiomVisitor visitor) {
        visitor.visit(this);
    }

    @Override
    public  O accept(OWLAxiomVisitorEx visitor) {
        return visitor.visit(this);
    }

    @Override
    public SWRLRule getSimplified() {
        return (SWRLRule) accept(ATOM_SIMPLIFIER);
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (!super.equals(obj)) {
            return false;
        }
        if (!(obj instanceof SWRLRule)) {
            return false;
        }
        SWRLRule other = (SWRLRule) obj;
        return other.getBody().equals(body) && other.getHead().equals(head);
    }

    @Override
    public AxiomType getAxiomType() {
        return AxiomType.SWRL_RULE;
    }

    @Override
    protected int compareObjectOfSameType(OWLObject object) {
        SWRLRule other = (SWRLRule) object;
        int diff = compareSets(getBody(), other.getBody());
        if (diff == 0) {
            diff = compareSets(getHead(), other.getHead());
        }
        return diff;
    }

    @Nonnull
    protected static final AtomSimplifier ATOM_SIMPLIFIER = new AtomSimplifier();

    protected static class AtomSimplifier implements
            SWRLObjectVisitorEx {

        @Override
        public SWRLRule visit(SWRLRule node) {
            Set nodebody = new HashSet<>();
            for (SWRLAtom atom : node.getBody()) {
                nodebody.add((SWRLAtom) atom.accept(this));
            }
            Set nodehead = new HashSet<>();
            for (SWRLAtom atom : node.getHead()) {
                nodehead.add((SWRLAtom) atom.accept(this));
            }
            return new SWRLRuleImpl(nodebody, nodehead, NO_ANNOTATIONS);
        }

        @Override
        public SWRLClassAtom visit(SWRLClassAtom node) {
            return node;
        }

        @Override
        public SWRLDataRangeAtom visit(SWRLDataRangeAtom node) {
            return node;
        }

        @Override
        public SWRLObjectPropertyAtom visit(SWRLObjectPropertyAtom node) {
            return node.getSimplified();
        }

        @Override
        public SWRLDataPropertyAtom visit(SWRLDataPropertyAtom node) {
            return node;
        }

        @Override
        public SWRLBuiltInAtom visit(SWRLBuiltInAtom node) {
            return node;
        }

        @Override
        public SWRLVariable visit(SWRLVariable node) {
            return node;
        }

        @Override
        public SWRLIndividualArgument visit(SWRLIndividualArgument node) {
            return node;
        }

        @Override
        public SWRLLiteralArgument visit(SWRLLiteralArgument node) {
            return node;
        }

        @Override
        public SWRLSameIndividualAtom visit(SWRLSameIndividualAtom node) {
            return node;
        }

        @Override
        public SWRLDifferentIndividualsAtom visit(
                SWRLDifferentIndividualsAtom node) {
            return node;
        }
    }
}




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