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package com.tinkerpop.gremlin.process.graph.step.sideEffect;

import com.tinkerpop.gremlin.LoadGraphWith;
import com.tinkerpop.gremlin.process.AbstractGremlinProcessTest;
import com.tinkerpop.gremlin.process.Path;
import com.tinkerpop.gremlin.process.Traversal;
import com.tinkerpop.gremlin.process.util.MapHelper;
import com.tinkerpop.gremlin.structure.Vertex;
import org.junit.Test;

import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import static com.tinkerpop.gremlin.LoadGraphWith.GraphData.MODERN;
import static org.hamcrest.CoreMatchers.not;
import static org.junit.Assert.*;

/**
 * @author Marko A. Rodriguez (http://markorodriguez.com)
 * @author Stephen Mallette (http://stephen.genoprime.com)
 */
public abstract class AggregateTest extends AbstractGremlinProcessTest {

    public abstract Traversal> get_g_V_name_aggregate();

    public abstract Traversal> get_g_V_aggregate_byXnameX();

    public abstract Traversal get_g_V_out_aggregateXaX_path();

    //public abstract Traversal get_g_v1_asXxX_bothE_asXeX_valueXweightX_exceptXwX_aggregateXwX_backXeX_otherV_jumpXx_true_trueX_path(final Object v1Id);

    @Test
    @LoadGraphWith(MODERN)
    public void g_V_valueXnameX_aggregate() {
        Traversal> traversal = get_g_V_name_aggregate();
        printTraversalForm(traversal);
        final Collection names = traversal.next();
        assertFalse(traversal.hasNext());
        checkListOfNames(names);
    }

    @Test
    @LoadGraphWith(MODERN)
    public void g_V_aggregate_byXnameX() {
        Traversal> traversal = get_g_V_aggregate_byXnameX();
        printTraversalForm(traversal);
        final Collection names = traversal.next();
        assertFalse(traversal.hasNext());
        checkListOfNames(names);
    }

    private void checkListOfNames(Collection names) {
        assertEquals(6, names.size());
        assertTrue(names.contains("marko"));
        assertTrue(names.contains("josh"));
        assertTrue(names.contains("peter"));
        assertTrue(names.contains("lop"));
        assertTrue(names.contains("vadas"));
        assertTrue(names.contains("ripple"));
    }

    @Test
    @LoadGraphWith(MODERN)
    public void g_V_out_aggregateXaX_path() {
        final Traversal traversal = get_g_V_out_aggregateXaX_path();
        printTraversalForm(traversal);
        int count = 0;
        final Map firstStepCounts = new HashMap<>();
        final Map secondStepCounts = new HashMap<>();
        while (traversal.hasNext()) {
            count++;
            Path path = traversal.next();
            String first = path.get(0).toString();
            String second = path.get(1).toString();
            assertThat(first, not(second));
            MapHelper.incr(firstStepCounts, first, 1l);
            MapHelper.incr(secondStepCounts, second, 1l);
        }
        assertEquals(6, count);
        assertEquals(3, firstStepCounts.size());
        assertEquals(4, secondStepCounts.size());
        assertTrue(firstStepCounts.values().contains(3l));
        assertTrue(firstStepCounts.values().contains(2l));
        assertTrue(firstStepCounts.values().contains(1l));
        assertTrue(secondStepCounts.values().contains(3l));
        assertTrue(secondStepCounts.values().contains(1l));
    }

    /*@Test
    @LoadGraphWith(CLASSIC)
    public void g_v1_asXxX_bothE_asXeX_valueXweightX_exceptXwX_aggregateXwX_backXeX_otherV_jumpXx_true_trueX_path() {
        Iterator traversal = get_g_v1_asXxX_bothE_asXeX_valueXweightX_exceptXwX_aggregateXwX_backXeX_otherV_jumpXx_true_trueX_path(convertToVertexId("marko"));
        System.out.println("Testing: " + traversal);
        final List paths = StreamFactory.stream(traversal).collect(Collectors.toList());
        // for OLTP it's a roulette game; the result can change depending on which path is taken first by the traverser (this makes some cool real world use cases possible)
        // Senzari use case: generate a random playlist without artist repetitions
        assertEquals(4, paths.size());
        assertEquals(3, paths.stream().filter(path -> path.size() == 3).count());
        assertEquals(1, paths.stream().filter(path -> path.size() == 5).count());
        assertFalse(traversal.hasNext());
    }*/


    public static class StandardTest extends AggregateTest {

        @Override
        public Traversal> get_g_V_name_aggregate() {
            return (Traversal) g.V().values("name").aggregate();
        }

        @Override
        public Traversal> get_g_V_aggregate_byXnameX() {
            return (Traversal) g.V().aggregate().by("name");
        }

        @Override
        public Traversal get_g_V_out_aggregateXaX_path() {
            return g.V().out().aggregate("a").path();
        }

        /*public Traversal get_g_v1_asXxX_bothE_asXeX_valueXweightX_exceptXwX_aggregateXwX_backXeX_otherV_jumpXx_true_trueX_path(final Object v1Id) {
            return g.V(1).as("x").bothE().as("e").value("weight").except("w").aggregate("w").back("e").otherV().jump("x", t -> true, t -> true).path();
        }*/
    }

    public static class ComputerTest extends AggregateTest {

        public ComputerTest() {
            requiresGraphComputer = true;
        }

        @Override
        public Traversal> get_g_V_name_aggregate() {
            return (Traversal) g.V().values("name").aggregate().submit(g.compute());
        }

        @Override
        public Traversal> get_g_V_aggregate_byXnameX() {
            return (Traversal) g.V().aggregate().by("name").submit(g.compute());
        }

        @Override
        public Traversal get_g_V_out_aggregateXaX_path() {
            return g.V().out().aggregate("a").path().submit(g.compute());
        }
    }
}