/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.clerezza.rdf.utils;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

import static org.junit.Assert.*;

import org.junit.Test;
import org.apache.clerezza.rdf.core.BNode;
import org.apache.clerezza.rdf.core.Graph;
import org.apache.clerezza.rdf.core.Literal;
import org.apache.clerezza.rdf.core.MGraph;
import org.apache.clerezza.rdf.core.NonLiteral;
import org.apache.clerezza.rdf.core.Resource;
import org.apache.clerezza.rdf.core.Triple;
import org.apache.clerezza.rdf.core.UriRef;
import org.apache.clerezza.rdf.core.impl.PlainLiteralImpl;
import org.apache.clerezza.rdf.core.impl.SimpleMGraph;
import org.apache.clerezza.rdf.core.impl.TripleImpl;
import org.apache.clerezza.rdf.core.test.RandomMGraph;

/**
 *
 * @author reto, mir
 */
public class TestGraphNode {

    @Test
    public void nodeContext() {
        MGraph g = new SimpleMGraph();
        BNode bNode1 = new BNode() {};
        BNode bNode2 = new BNode() {};
        UriRef property1 = new UriRef("http://example.org/property1");
        UriRef property2 = new UriRef("http://example.org/property2");
        g.add(new TripleImpl(bNode1, property1, new PlainLiteralImpl("literal")));
        g.add(new TripleImpl(bNode1, property2, property1));
        g.add(new TripleImpl(bNode2, property2, bNode1));
        g.add(new TripleImpl(property1, property1, bNode2));
        g.add(new TripleImpl(property1, property1, new PlainLiteralImpl("bla bla")));
        GraphNode n = new GraphNode(bNode1, g);
        assertEquals(4, n.getNodeContext().size());
        n.deleteNodeContext();
        assertEquals(1, g.size());
        assertFalse(n.getObjects(property2).hasNext());
    }

    @Test
    public void addNode() {
        MGraph g = new SimpleMGraph();
        BNode bNode1 = new BNode() {};
        BNode bNode2 = new BNode() {};
        UriRef property1 = new UriRef("http://example.org/property1");
        GraphNode n = new GraphNode(bNode1, g);
        n.addProperty(property1, bNode2);
        assertEquals(1, g.size());
    }
    
    @Test
    public void getNodeContextTest(){
    	MGraph g = new SimpleMGraph();
    	NonLiteral subject1 = new UriRef("http://example.org/subject1");
    	NonLiteral subject2 = new UriRef("http://example.org/subject2");
        UriRef property1 = new UriRef("http://example.org/property1");
        //UriRef property2 = new UriRef("http://example.org/property2");
        Triple forwardTriple = new TripleImpl(subject1, property1, new PlainLiteralImpl("literal"));
        Triple backwardTriple = new TripleImpl(subject2, property1, subject1);
        g.add(forwardTriple);
        g.add(backwardTriple);
        
        GraphNode n = new GraphNode(subject1, g);
        
        assertEquals(2, n.getNodeContext().size());
        
        Graph fwd = n.getNodeContext(true,false);
        assertEquals(1, fwd.size());
        assertEquals(true, fwd.contains(forwardTriple));
        
        Graph bwd = n.getNodeContext(false,true);
        assertEquals(1,bwd.size());
        assertEquals(true, bwd.contains(backwardTriple));
    }

    @Test
    public void testGetSubjectAndObjectNodes() {
        RandomMGraph graph = new RandomMGraph(500, 20, new SimpleMGraph());
        for (int j = 0; j < 200; j++) {
            Triple randomTriple = graph.getRandomTriple();
            GraphNode node = new GraphNode(randomTriple.getSubject(), graph);
            Iterator<UriRef> properties = node.getProperties();
            while (properties.hasNext()) {
                UriRef property = properties.next();
                Set<Resource> objects = createSet(node.getObjects(property));
                Iterator<GraphNode> objectNodes = node.getObjectNodes(property);
                while (objectNodes.hasNext()) {
                    GraphNode graphNode = objectNodes.next();
                    assertTrue(objects.contains(graphNode.getNode()));
                }
            }
        }

        for (int j = 0; j < 200; j++) {
            Triple randomTriple = graph.getRandomTriple();
            GraphNode node = new GraphNode(randomTriple.getObject(), graph);
            Iterator<UriRef> properties = node.getProperties();
            while (properties.hasNext()) {
                UriRef property = properties.next();
                Set<Resource> subjects = createSet(node.getSubjects(property));
                Iterator<GraphNode> subjectNodes = node.getSubjectNodes(property);
                while (subjectNodes.hasNext()) {
                    GraphNode graphNode = subjectNodes.next();
                    assertTrue(subjects.contains(graphNode.getNode()));
                }
            }
        }
    }

    @Test
    public void getAvailableProperties(){
        MGraph g = new SimpleMGraph();
        BNode bNode1 = new BNode() {};
        BNode bNode2 = new BNode() {};
        UriRef property1 = new UriRef("http://example.org/property1");
        UriRef property2 = new UriRef("http://example.org/property2");
        UriRef property3 = new UriRef("http://example.org/property3");
        UriRef property4 = new UriRef("http://example.org/property4");
        ArrayList<UriRef> props = new ArrayList<UriRef>();
        props.add(property1);
        props.add(property2);
        props.add(property3);
        props.add(property4);
        GraphNode n = new GraphNode(bNode1, g);
        n.addProperty(property1, bNode2);
        n.addProperty(property2, bNode2);
        n.addProperty(property3, bNode2);
        n.addProperty(property4, bNode2);
        Iterator<UriRef> properties = n.getProperties();
        int i = 0;
        while(properties.hasNext()){
            i++;
            UriRef prop = properties.next();
            assertTrue(props.contains(prop));
            props.remove(prop);
        }
        assertEquals(i, 4);
        assertEquals(props.size(), 0);

    }

    @Test
    public void deleteAll() {
        MGraph g = new SimpleMGraph();
        BNode bNode1 = new BNode() {};
        BNode bNode2 = new BNode() {};
        UriRef property1 = new UriRef("http://example.org/property1");
        UriRef property2 = new UriRef("http://example.org/property2");
        //the two properties two be deleted
        g.add(new TripleImpl(bNode1, property1, new PlainLiteralImpl("literal")));
        g.add(new TripleImpl(bNode1, property1, new PlainLiteralImpl("bla bla")));
        //this 3 properties should stay
        g.add(new TripleImpl(bNode1, property2, property1));
        g.add(new TripleImpl(property1, property1, new PlainLiteralImpl("bla bla")));
        g.add(new TripleImpl(bNode2, property1, new PlainLiteralImpl("bla bla")));
        GraphNode n = new GraphNode(bNode1, g);
        n.deleteProperties(property1);
        assertEquals(3, g.size());
    }

    @Test
    public void deleteSingleProperty() {
        MGraph g = new SimpleMGraph();
        BNode bNode1 = new BNode() {};
        BNode bNode2 = new BNode() {};
        UriRef property1 = new UriRef("http://example.org/property1");
        UriRef property2 = new UriRef("http://example.org/property2");
        //the properties two be deleted
        g.add(new TripleImpl(bNode1, property1, new PlainLiteralImpl("literal")));
        //this 4 properties should stay
        g.add(new TripleImpl(bNode1, property1, new PlainLiteralImpl("bla bla")));
        g.add(new TripleImpl(bNode1, property2, property1));
        g.add(new TripleImpl(property1, property1, new PlainLiteralImpl("bla bla")));
        g.add(new TripleImpl(bNode2, property1, new PlainLiteralImpl("bla bla")));
        GraphNode n = new GraphNode(bNode1, g);
        n.deleteProperty(property1, new PlainLiteralImpl("literal"));
        assertEquals(4, g.size());
    }

    @Test
    public void replaceWith() {
        MGraph initialGraph = new SimpleMGraph();
        BNode bNode1 = new BNode();
        BNode bNode2 = new BNode();
        BNode newBnode = new BNode();
        UriRef property1 = new UriRef("http://example.org/property1");
        UriRef property2 = new UriRef("http://example.org/property2");
        UriRef newUriRef = new UriRef("http://example.org/newName");
        Literal literal1 = new PlainLiteralImpl("literal");
        Literal literal2 = new PlainLiteralImpl("bla bla");

        Triple triple1 = new TripleImpl(bNode1, property1, literal1);
        Triple triple2 = new TripleImpl(bNode1, property2, property1);
        Triple triple3 = new TripleImpl(bNode2, property2, bNode1);
        Triple triple4 = new TripleImpl(property1, property1, bNode2);
        Triple triple5 = new TripleImpl(property1, property1, literal2);
        initialGraph.add(triple1);
        initialGraph.add(triple2);
        initialGraph.add(triple3);
        initialGraph.add(triple4);
        initialGraph.add(triple5);
        GraphNode node = new GraphNode(property1,
                new SimpleMGraph(initialGraph.iterator()));

        node.replaceWith(newUriRef, true);
        assertEquals(5, node.getGraph().size());
        Triple expectedTriple1 = new TripleImpl(bNode1, newUriRef, literal1);
        Triple expectedTriple2 = new TripleImpl(bNode1, property2, newUriRef);
        Triple expectedTriple3 = new TripleImpl(newUriRef, newUriRef, bNode2);
        Triple expectedTriple4 = new TripleImpl(newUriRef, newUriRef, literal2);

        assertTrue(node.getGraph().contains(expectedTriple1));
        assertTrue(node.getGraph().contains(expectedTriple2));
        assertTrue(node.getGraph().contains(expectedTriple3));
        assertTrue(node.getGraph().contains(expectedTriple4));

        assertFalse(node.getGraph().contains(triple1));
        assertFalse(node.getGraph().contains(triple2));
        assertFalse(node.getGraph().contains(triple4));
        assertFalse(node.getGraph().contains(triple5));

        node = new GraphNode(property1, new SimpleMGraph(initialGraph.iterator()));
        node.replaceWith(newBnode);
        Triple expectedTriple5 = new TripleImpl(bNode1, property2, newBnode);
        Triple expectedTriple6 = new TripleImpl(newBnode, property1, bNode2);
        Triple expectedTriple7 = new TripleImpl(newBnode, property1, literal2);

        assertTrue(node.getGraph().contains(triple1));
        assertTrue(node.getGraph().contains(expectedTriple5));
        assertTrue(node.getGraph().contains(expectedTriple6));
        assertTrue(node.getGraph().contains(expectedTriple7));

        node = new GraphNode(literal1, new SimpleMGraph(initialGraph.iterator()));
        node.replaceWith(newBnode);
        Triple expectedTriple8 = new TripleImpl(bNode1, property1, newBnode);
        assertTrue(node.getGraph().contains(expectedTriple8));

        node = new GraphNode(property1, new SimpleMGraph(initialGraph.iterator()));
        node.replaceWith(newUriRef);
        Triple expectedTriple9 = new TripleImpl(bNode1, property2, newUriRef);
        Triple expectedTriple10 = new TripleImpl(newUriRef, property1, bNode2);
        Triple expectedTriple11 = new TripleImpl(newUriRef, property1, literal2);
        assertTrue(node.getGraph().contains(triple1));
        assertTrue(node.getGraph().contains(expectedTriple9));
        assertTrue(node.getGraph().contains(expectedTriple10));
        assertTrue(node.getGraph().contains(expectedTriple11));
    }

    @Test
    public void equality() {
        MGraph g = new SimpleMGraph();
        BNode bNode1 = new BNode() {};
        BNode bNode2 = new BNode() {};
        UriRef property1 = new UriRef("http://example.org/property1");
        GraphNode n = new GraphNode(bNode1, g);
        n.addProperty(property1, bNode2);
        assertTrue(n.equals(new GraphNode(bNode1, g)));
        assertFalse(n.equals(new GraphNode(bNode2, g)));
        GraphNode n2 = null;
        assertFalse(n.equals(n2));
    }

    private Set<Resource> createSet(Iterator<? extends Resource> resources) {
        Set<Resource> set = new HashSet<Resource>();
        while (resources.hasNext()) {
            Resource resource = resources.next();
            set.add(resource);
        }
        return set;
    }

}