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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 org.semanticweb.owlapi.reasoner.impl;

import static org.semanticweb.owlapi.util.OWLAPIPreconditions.checkNotNull;
import static org.semanticweb.owlapi.util.OWLAPIPreconditions.verifyNotNull;
import static org.semanticweb.owlapi.util.OWLAPIStreamUtils.asUnorderedSet;

import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Stream;

import javax.annotation.Nullable;

import org.semanticweb.owlapi.model.OWLObject;
import org.semanticweb.owlapi.reasoner.Node;
import org.semanticweb.owlapi.util.OWLAPIStreamUtils;

/**
 * @param  the type of entities in the node
 * @author Matthew Horridge, The University of Manchester, Information Management Group
 * @since 3.0.0
 */
public abstract class DefaultNode implements Node {

    private final Set entities = new HashSet<>(4);

    /**
     * @param entity the entity to add
     */
    public DefaultNode(E entity) {
        entities.add(checkNotNull(entity, "entity cannot be null"));
    }

    /**
     * @param entities the entities to add
     */
    public DefaultNode(Collection entities) {
        this.entities.addAll(checkNotNull(entities, "entities cannot be null"));
    }

    /**
     * @param entities the entities to add
     */
    public DefaultNode(Stream entities) {
        OWLAPIStreamUtils.add(this.entities, checkNotNull(entities, "entities cannot be null"));
    }

    protected DefaultNode() {}

    protected abstract Optional getTopEntity();

    protected abstract Optional getBottomEntity();

    /**
     * @param entity entity to be added
     */
    public void add(E entity) {
        entities.add(entity);
    }

    @Override
    public boolean isTopNode() {
        if (!getTopEntity().isPresent()) {
            return false;
        }
        return entities.contains(getTopEntity().get());
    }

    @Override
    public boolean isBottomNode() {
        if (!getBottomEntity().isPresent()) {
            return false;
        }
        return entities.contains(getBottomEntity().get());
    }

    @Override
    public Stream entities() {
        return entities.stream();
    }

    @Override
    public int getSize() {
        return entities.size();
    }

    @Override
    public boolean contains(E entity) {
        return entities.contains(entity);
    }

    @Override
    public Set getEntitiesMinus(E e) {
        return asUnorderedSet(entities.stream().filter(i -> !i.equals(e)));
    }

    @Override
    public Set getEntitiesMinusTop() {
        Optional topEntity = getTopEntity();
        if (topEntity.isPresent()) {
            return getEntitiesMinus(topEntity.get());
        }
        return asUnorderedSet(entities.stream());
    }

    @Override
    public Set getEntitiesMinusBottom() {
        Optional bottomEntity = getBottomEntity();
        if (bottomEntity.isPresent()) {
            return getEntitiesMinus(bottomEntity.get());
        }
        return asUnorderedSet(entities.stream());
    }

    @Override
    public boolean isSingleton() {
        return entities.size() == 1;
    }

    @Override
    public E getRepresentativeElement() {
        return entities.iterator().next();
    }

    @Override
    public Iterator iterator() {
        return entities.iterator();
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("Node( ");
        for (OWLObject entity : entities) {
            sb.append(entity);
            sb.append(' ');
        }
        sb.append(')');
        return verifyNotNull(sb.toString());
    }

    @Override
    public boolean equals(@Nullable Object obj) {
        if (obj == null) {
            return false;
        }
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof Node)) {
            return false;
        }
        @SuppressWarnings("unchecked") Node other = (Node) obj;
        return entities.equals(asUnorderedSet(other.entities()));
    }

    @Override
    public int hashCode() {
        return entities.hashCode();
    }
}