/*******************************************************************************
 * Copyright (c) 2015-2018 Skymind, Inc.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Apache License, Version 2.0 which is available at
 * https://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.
 *
 * SPDX-License-Identifier: Apache-2.0
 ******************************************************************************/

package org.deeplearning4j.models.sequencevectors.transformers.impl;

import org.deeplearning4j.BaseDL4JTest;
import org.deeplearning4j.models.sequencevectors.graph.enums.NoEdgeHandling;
import org.deeplearning4j.models.sequencevectors.graph.primitives.Graph;
import org.deeplearning4j.models.sequencevectors.graph.primitives.IGraph;
import org.deeplearning4j.models.sequencevectors.graph.vertex.AbstractVertexFactory;
import org.deeplearning4j.models.sequencevectors.graph.walkers.GraphWalker;
import org.deeplearning4j.models.sequencevectors.graph.walkers.impl.RandomWalker;
import org.deeplearning4j.models.sequencevectors.sequence.Sequence;
import org.deeplearning4j.models.word2vec.VocabWord;
import org.junit.Before;
import org.junit.Test;

import java.util.Iterator;

import static org.junit.Assert.assertEquals;

/**
 * @author raver119@gmail.com
 */
public class GraphTransformerTest extends BaseDL4JTest {

    private static IGraph<VocabWord, Double> graph;

    @Before
    public void setUp() throws Exception {
        if (graph == null) {
            graph = new Graph<>(10, false, new AbstractVertexFactory<VocabWord>());

            for (int i = 0; i < 10; i++) {
                graph.getVertex(i).setValue(new VocabWord(i, String.valueOf(i)));

                int x = i + 3;
                if (x >= 10)
                    x = 0;
                graph.addEdge(i, x, 1.0, false);
            }
        }
    }

    @Test
    public void testGraphTransformer1() throws Exception {
        GraphWalker<VocabWord> walker = new RandomWalker.Builder<>(graph)
                        .setNoEdgeHandling(NoEdgeHandling.CUTOFF_ON_DISCONNECTED).build();

        GraphTransformer<VocabWord> transformer = new GraphTransformer.Builder<>(graph).setGraphWalker(walker).build();

        Iterator<Sequence<VocabWord>> iterator = transformer.iterator();
        int cnt = 0;
        while (iterator.hasNext()) {
            Sequence<VocabWord> sequence = iterator.next();
            System.out.println(sequence);
            cnt++;
        }

        assertEquals(10, cnt);
    }
}
