/*
 * 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 io.prestosql.operator.unnest;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import io.prestosql.metadata.Metadata;
import io.prestosql.operator.DriverContext;
import io.prestosql.operator.OperatorFactory;
import io.prestosql.spi.Page;
import io.prestosql.spi.type.ArrayType;
import io.prestosql.spi.type.RowType;
import io.prestosql.spi.type.Type;
import io.prestosql.sql.planner.plan.PlanNodeId;
import io.prestosql.testing.MaterializedResult;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;

import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ScheduledExecutorService;

import static io.airlift.concurrent.Threads.daemonThreadsNamed;
import static io.prestosql.RowPagesBuilder.rowPagesBuilder;
import static io.prestosql.SessionTestUtils.TEST_SESSION;
import static io.prestosql.metadata.MetadataManager.createTestMetadataManager;
import static io.prestosql.operator.OperatorAssertion.assertOperatorEquals;
import static io.prestosql.spi.type.BigintType.BIGINT;
import static io.prestosql.spi.type.DoubleType.DOUBLE;
import static io.prestosql.spi.type.TypeSignature.parseTypeSignature;
import static io.prestosql.spi.type.VarcharType.VARCHAR;
import static io.prestosql.testing.MaterializedResult.resultBuilder;
import static io.prestosql.testing.TestingTaskContext.createTaskContext;
import static io.prestosql.util.StructuralTestUtil.arrayBlockOf;
import static io.prestosql.util.StructuralTestUtil.mapBlockOf;
import static java.lang.Double.NEGATIVE_INFINITY;
import static java.lang.Double.NaN;
import static java.lang.Double.POSITIVE_INFINITY;
import static java.util.concurrent.Executors.newCachedThreadPool;
import static java.util.concurrent.Executors.newScheduledThreadPool;

@Test(singleThreaded = true)
public class TestUnnestOperator
{
    private ExecutorService executor;
    private ScheduledExecutorService scheduledExecutor;
    private DriverContext driverContext;

    @BeforeMethod
    public void setUp()
    {
        executor = newCachedThreadPool(daemonThreadsNamed("test-executor-%s"));
        scheduledExecutor = newScheduledThreadPool(2, daemonThreadsNamed("test-scheduledExecutor-%s"));

        driverContext = createTaskContext(executor, scheduledExecutor, TEST_SESSION)
                .addPipelineContext(0, true, true, false)
                .addDriverContext();
    }

    @AfterMethod(alwaysRun = true)
    public void tearDown()
    {
        executor.shutdownNow();
        scheduledExecutor.shutdownNow();
    }

    @Test
    public void testUnnest()
    {
        Metadata metadata = createTestMetadataManager();
        Type arrayType = metadata.getType(parseTypeSignature("array(bigint)"));
        Type mapType = metadata.getType(parseTypeSignature("map(bigint,bigint)"));

        List<Page> input = rowPagesBuilder(BIGINT, arrayType, mapType)
                .row(1L, arrayBlockOf(BIGINT, 2, 3), mapBlockOf(BIGINT, BIGINT, ImmutableMap.of(4, 5)))
                .row(2L, arrayBlockOf(BIGINT, 99), null)
                .row(3L, null, null)
                .pageBreak()
                .row(6L, arrayBlockOf(BIGINT, 7, 8), mapBlockOf(BIGINT, BIGINT, ImmutableMap.of(9, 10, 11, 12)))
                .build();

        OperatorFactory operatorFactory = new UnnestOperator.UnnestOperatorFactory(
                0, new PlanNodeId("test"), ImmutableList.of(0), ImmutableList.of(BIGINT), ImmutableList.of(1, 2), ImmutableList.of(arrayType, mapType), false);

        MaterializedResult expected = resultBuilder(driverContext.getSession(), BIGINT, BIGINT, BIGINT, BIGINT)
                .row(1L, 2L, 4L, 5L)
                .row(1L, 3L, null, null)
                .row(2L, 99L, null, null)
                .row(6L, 7L, 9L, 10L)
                .row(6L, 8L, 11L, 12L)
                .build();

        assertOperatorEquals(operatorFactory, driverContext, input, expected);
    }

    @Test
    public void testUnnestWithArray()
    {
        Metadata metadata = createTestMetadataManager();
        Type arrayType = metadata.getType(parseTypeSignature("array(array(bigint))"));
        Type mapType = metadata.getType(parseTypeSignature("map(array(bigint),array(bigint))"));

        List<Page> input = rowPagesBuilder(BIGINT, arrayType, mapType)
                .row(
                        1L,
                        arrayBlockOf(new ArrayType(BIGINT), ImmutableList.of(2, 4), ImmutableList.of(3, 6)),
                        mapBlockOf(new ArrayType(BIGINT), new ArrayType(BIGINT), ImmutableMap.of(ImmutableList.of(4, 8), ImmutableList.of(5, 10))))
                .row(2L, arrayBlockOf(new ArrayType(BIGINT), ImmutableList.of(99, 198)), null)
                .row(3L, null, null)
                .pageBreak()
                .row(
                        6,
                        arrayBlockOf(new ArrayType(BIGINT), ImmutableList.of(7, 14), ImmutableList.of(8, 16)),
                        mapBlockOf(new ArrayType(BIGINT), new ArrayType(BIGINT), ImmutableMap.of(ImmutableList.of(9, 18), ImmutableList.of(10, 20), ImmutableList.of(11, 22), ImmutableList.of(12, 24))))
                .build();

        OperatorFactory operatorFactory = new UnnestOperator.UnnestOperatorFactory(
                0, new PlanNodeId("test"), ImmutableList.of(0), ImmutableList.of(BIGINT), ImmutableList.of(1, 2), ImmutableList.of(arrayType, mapType), false);

        MaterializedResult expected = resultBuilder(driverContext.getSession(), BIGINT, new ArrayType(BIGINT), new ArrayType(BIGINT), new ArrayType(BIGINT))
                .row(1L, ImmutableList.of(2L, 4L), ImmutableList.of(4L, 8L), ImmutableList.of(5L, 10L))
                .row(1L, ImmutableList.of(3L, 6L), null, null)
                .row(2L, ImmutableList.of(99L, 198L), null, null)
                .row(6L, ImmutableList.of(7L, 14L), ImmutableList.of(9L, 18L), ImmutableList.of(10L, 20L))
                .row(6L, ImmutableList.of(8L, 16L), ImmutableList.of(11L, 22L), ImmutableList.of(12L, 24L))
                .build();

        assertOperatorEquals(operatorFactory, driverContext, input, expected);
    }

    @Test
    public void testUnnestWithOrdinality()
    {
        Metadata metadata = createTestMetadataManager();
        Type arrayType = metadata.getType(parseTypeSignature("array(bigint)"));
        Type mapType = metadata.getType(parseTypeSignature("map(bigint,bigint)"));

        List<Page> input = rowPagesBuilder(BIGINT, arrayType, mapType)
                .row(1L, arrayBlockOf(BIGINT, 2, 3), mapBlockOf(BIGINT, BIGINT, ImmutableMap.of(4, 5)))
                .row(2L, arrayBlockOf(BIGINT, 99), null)
                .row(3L, null, null)
                .pageBreak()
                .row(6L, arrayBlockOf(BIGINT, 7, 8), mapBlockOf(BIGINT, BIGINT, ImmutableMap.of(9, 10, 11, 12)))
                .build();

        OperatorFactory operatorFactory = new UnnestOperator.UnnestOperatorFactory(
                0, new PlanNodeId("test"), ImmutableList.of(0), ImmutableList.of(BIGINT), ImmutableList.of(1, 2), ImmutableList.of(arrayType, mapType), true);

        MaterializedResult expected = resultBuilder(driverContext.getSession(), BIGINT, BIGINT, BIGINT, BIGINT, BIGINT)
                .row(1L, 2L, 4L, 5L, 1L)
                .row(1L, 3L, null, null, 2L)
                .row(2L, 99L, null, null, 1L)
                .row(6L, 7L, 9L, 10L, 1L)
                .row(6L, 8L, 11L, 12L, 2L)
                .build();

        assertOperatorEquals(operatorFactory, driverContext, input, expected);
    }

    @Test
    public void testUnnestNonNumericDoubles()
    {
        Metadata metadata = createTestMetadataManager();
        Type arrayType = metadata.getType(parseTypeSignature("array(double)"));
        Type mapType = metadata.getType(parseTypeSignature("map(bigint,double)"));

        List<Page> input = rowPagesBuilder(BIGINT, arrayType, mapType)
                .row(1L, arrayBlockOf(DOUBLE, NEGATIVE_INFINITY, POSITIVE_INFINITY, NaN),
                        mapBlockOf(BIGINT, DOUBLE, ImmutableMap.of(1, NEGATIVE_INFINITY, 2, POSITIVE_INFINITY, 3, NaN)))
                .build();

        OperatorFactory operatorFactory = new UnnestOperator.UnnestOperatorFactory(
                0, new PlanNodeId("test"), ImmutableList.of(0), ImmutableList.of(BIGINT), ImmutableList.of(1, 2), ImmutableList.of(arrayType, mapType), false);

        MaterializedResult expected = resultBuilder(driverContext.getSession(), BIGINT, DOUBLE, BIGINT, DOUBLE)
                .row(1L, NEGATIVE_INFINITY, 1L, NEGATIVE_INFINITY)
                .row(1L, POSITIVE_INFINITY, 2L, POSITIVE_INFINITY)
                .row(1L, NaN, 3L, NaN)
                .build();

        assertOperatorEquals(operatorFactory, driverContext, input, expected);
    }

    @Test
    public void testUnnestWithArrayOfRows()
    {
        Metadata metadata = createTestMetadataManager();
        Type arrayOfRowType = metadata.getType(parseTypeSignature("array(row(bigint, double, varchar))"));
        Type elementType = RowType.anonymous(ImmutableList.of(BIGINT, DOUBLE, VARCHAR));

        List<Page> input = rowPagesBuilder(BIGINT, arrayOfRowType)
                .row(1, arrayBlockOf(elementType, ImmutableList.of(2, 4.2, "abc"), ImmutableList.of(3, 6.6, "def")))
                .row(2, arrayBlockOf(elementType, ImmutableList.of(99, 3.14, "pi"), null))
                .row(3, null)
                .pageBreak()
                .row(6, arrayBlockOf(elementType, null, ImmutableList.of(8, 1.111, "tt")))
                .build();

        OperatorFactory operatorFactory = new UnnestOperator.UnnestOperatorFactory(
                0, new PlanNodeId("test"), ImmutableList.of(0), ImmutableList.of(BIGINT), ImmutableList.of(1), ImmutableList.of(arrayOfRowType), false);

        MaterializedResult expected = resultBuilder(driverContext.getSession(), BIGINT, BIGINT, DOUBLE, VARCHAR)
                .row(1L, 2L, 4.2, "abc")
                .row(1L, 3L, 6.6, "def")
                .row(2L, 99L, 3.14, "pi")
                .row(2L, null, null, null)
                .row(6L, null, null, null)
                .row(6L, 8L, 1.111, "tt")
                .build();

        assertOperatorEquals(operatorFactory, driverContext, input, expected);
    }
}
