/*
 * 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.beam.sdk.extensions.sql.impl.rel;

import org.apache.beam.sdk.extensions.sql.TestUtils;
import org.apache.beam.sdk.extensions.sql.impl.BeamTableStatistics;
import org.apache.beam.sdk.extensions.sql.impl.planner.NodeStats;
import org.apache.beam.sdk.extensions.sql.impl.transform.BeamSqlOutputToConsoleFn;
import org.apache.beam.sdk.extensions.sql.meta.provider.test.TestUnboundedTable;
import org.apache.beam.sdk.schemas.Schema;
import org.apache.beam.sdk.testing.PAssert;
import org.apache.beam.sdk.testing.TestPipeline;
import org.apache.beam.sdk.transforms.ParDo;
import org.apache.beam.sdk.values.PCollection;
import org.apache.beam.sdk.values.Row;
import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.RelNode;
import org.joda.time.DateTime;
import org.joda.time.Duration;
import org.junit.Assert;
import org.junit.BeforeClass;
import org.junit.Rule;
import org.junit.Test;

/** Unbounded + Unbounded Test for {@code BeamCoGBKJoinRel}. */
public class BeamCoGBKJoinRelUnboundedVsUnboundedTest extends BaseRelTest {
  @Rule public final TestPipeline pipeline = TestPipeline.create();
  private static final DateTime FIRST_DATE = new DateTime(1);
  private static final DateTime SECOND_DATE = new DateTime(1 + 3600 * 1000);

  private static final Duration WINDOW_SIZE = Duration.standardHours(1);

  @BeforeClass
  public static void prepare() {
    registerTable(
        "ORDER_DETAILS",
        TestUnboundedTable.of(
                Schema.FieldType.INT32, "order_id",
                Schema.FieldType.INT32, "site_id",
                Schema.FieldType.INT32, "price",
                Schema.FieldType.DATETIME, "order_time")
            .timestampColumnIndex(3)
            .addRows(Duration.ZERO, 1, 1, 1, FIRST_DATE, 1, 2, 6, FIRST_DATE)
            .addRows(
                WINDOW_SIZE.plus(Duration.standardMinutes(1)),
                2,
                2,
                7,
                SECOND_DATE,
                2,
                3,
                8,
                SECOND_DATE,
                // this late record is omitted(First window)
                1,
                3,
                3,
                FIRST_DATE)
            .addRows(
                // this late record is omitted(Second window)
                WINDOW_SIZE.plus(WINDOW_SIZE).plus(Duration.standardMinutes(1)),
                2,
                3,
                3,
                SECOND_DATE)
            .setStatistics(BeamTableStatistics.createUnboundedTableStatistics(3d)));
  }

  @Test
  public void testInnerJoin() throws Exception {
    String sql =
        "SELECT * FROM "
            + "(select order_id, sum(site_id) as sum_site_id FROM ORDER_DETAILS "
            + "          GROUP BY order_id, TUMBLE(order_time, INTERVAL '1' HOUR)) o1 "
            + " JOIN "
            + "(select order_id, sum(site_id) as sum_site_id FROM ORDER_DETAILS "
            + "          GROUP BY order_id, TUMBLE(order_time, INTERVAL '1' HOUR)) o2 "
            + " on "
            + " o1.order_id=o2.order_id";

    PCollection<Row> rows = compilePipeline(sql, pipeline);
    PAssert.that(rows.apply(ParDo.of(new TestUtils.BeamSqlRow2StringDoFn())))
        .containsInAnyOrder(
            TestUtils.RowsBuilder.of(
                    Schema.builder()
                        .addField("order_id1", Schema.FieldType.INT32)
                        .addField("sum_site_id", Schema.FieldType.INT32)
                        .addField("order_id", Schema.FieldType.INT32)
                        .addField("sum_site_id0", Schema.FieldType.INT32)
                        .build())
                .addRows(1, 3, 1, 3, 2, 5, 2, 5)
                .getStringRows());
    pipeline.run();
  }

  @Test
  public void testNodeStatsEstimation() {
    String sql =
        "SELECT * FROM "
            + "(select order_id, sum(site_id) as sum_site_id FROM ORDER_DETAILS "
            + "          GROUP BY order_id, TUMBLE(order_time, INTERVAL '1' HOUR)) o1 "
            + " JOIN "
            + "(select order_id, sum(site_id) as sum_site_id FROM ORDER_DETAILS "
            + "          GROUP BY order_id, TUMBLE(order_time, INTERVAL '1' HOUR)) o2 "
            + " on "
            + " o1.order_id=o2.order_id";

    RelNode root = env.parseQuery(sql);

    while (!(root instanceof BeamCoGBKJoinRel)) {
      root = root.getInput(0);
    }

    NodeStats estimate = BeamSqlRelUtils.getNodeStats(root, root.getCluster().getMetadataQuery());
    NodeStats leftEstimate =
        BeamSqlRelUtils.getNodeStats(
            ((BeamCoGBKJoinRel) root).getLeft(), root.getCluster().getMetadataQuery());
    NodeStats rightEstimate =
        BeamSqlRelUtils.getNodeStats(
            ((BeamCoGBKJoinRel) root).getRight(), root.getCluster().getMetadataQuery());

    Assert.assertFalse(estimate.isUnknown());
    Assert.assertEquals(0d, estimate.getRowCount(), 0.01);

    Assert.assertNotEquals(0d, estimate.getRate(), 0.001);
    Assert.assertTrue(
        estimate.getRate()
            < leftEstimate.getRate() * rightEstimate.getWindow()
                + rightEstimate.getRate() * leftEstimate.getWindow());

    Assert.assertNotEquals(0d, estimate.getWindow(), 0.001);
    Assert.assertTrue(estimate.getWindow() < leftEstimate.getWindow() * rightEstimate.getWindow());
  }

  @Test
  public void testLeftOuterJoin() throws Exception {
    String sql =
        "SELECT * FROM "
            + "(select site_id as order_id, sum(site_id) as sum_site_id FROM ORDER_DETAILS "
            + "          GROUP BY site_id, TUMBLE(order_time, INTERVAL '1' HOUR)) o1 "
            + " LEFT OUTER JOIN "
            + "(select order_id, sum(site_id) as sum_site_id FROM ORDER_DETAILS "
            + "          GROUP BY order_id, TUMBLE(order_time, INTERVAL '1' HOUR)) o2 "
            + " on "
            + " o1.order_id=o2.order_id";

    // 1, 1 | 1, 3
    // 2, 2 | NULL, NULL
    // ---- | -----
    // 2, 2 | 2, 5
    // 3, 3 | NULL, NULL

    PCollection<Row> rows = compilePipeline(sql, pipeline);
    PAssert.that(rows.apply(ParDo.of(new TestUtils.BeamSqlRow2StringDoFn())))
        .containsInAnyOrder(
            TestUtils.RowsBuilder.of(
                    Schema.builder()
                        .addField("order_id1", Schema.FieldType.INT32)
                        .addField("sum_site_id", Schema.FieldType.INT32)
                        .addNullableField("order_id", Schema.FieldType.INT32)
                        .addNullableField("sum_site_id0", Schema.FieldType.INT32)
                        .build())
                .addRows(1, 1, 1, 3, 2, 2, null, null, 2, 2, 2, 5, 3, 3, null, null)
                .getStringRows());
    pipeline.run();
  }

  @Test
  public void testRightOuterJoin() throws Exception {
    String sql =
        "SELECT * FROM "
            + "(select order_id, sum(site_id) as sum_site_id FROM ORDER_DETAILS "
            + "          GROUP BY order_id, TUMBLE(order_time, INTERVAL '1' HOUR)) o1 "
            + " RIGHT OUTER JOIN "
            + "(select site_id as order_id, sum(site_id) as sum_site_id FROM ORDER_DETAILS "
            + "          GROUP BY site_id, TUMBLE(order_time, INTERVAL '1' HOUR)) o2 "
            + " on "
            + " o1.order_id=o2.order_id";

    PCollection<Row> rows = compilePipeline(sql, pipeline);
    PAssert.that(rows.apply(ParDo.of(new TestUtils.BeamSqlRow2StringDoFn())))
        .containsInAnyOrder(
            TestUtils.RowsBuilder.of(
                    Schema.builder()
                        .addNullableField("order_id1", Schema.FieldType.INT32)
                        .addNullableField("sum_site_id", Schema.FieldType.INT32)
                        .addField("order_id", Schema.FieldType.INT32)
                        .addField("sum_site_id0", Schema.FieldType.INT32)
                        .build())
                .addRows(1, 3, 1, 1, null, null, 2, 2, 2, 5, 2, 2, null, null, 3, 3)
                .getStringRows());
    pipeline.run();
  }

  @Test
  public void testFullOuterJoin() throws Exception {
    String sql =
        "SELECT * FROM "
            + "(select price as order_id1, sum(site_id) as sum_site_id FROM ORDER_DETAILS "
            + "          GROUP BY price, TUMBLE(order_time, INTERVAL '1' HOUR)) o1 "
            + " FULL OUTER JOIN "
            + "(select order_id, sum(site_id) as sum_site_id FROM ORDER_DETAILS "
            + "          GROUP BY order_id , TUMBLE(order_time, INTERVAL '1' HOUR)) o2 "
            + " on "
            + " o1.order_id1=o2.order_id";

    PCollection<Row> rows = compilePipeline(sql, pipeline);
    rows.apply(ParDo.of(new BeamSqlOutputToConsoleFn("hello")));
    PAssert.that(rows.apply(ParDo.of(new TestUtils.BeamSqlRow2StringDoFn())))
        .containsInAnyOrder(
            TestUtils.RowsBuilder.of(
                    Schema.builder()
                        .addNullableField("order_id1", Schema.FieldType.INT32)
                        .addNullableField("sum_site_id", Schema.FieldType.INT32)
                        .addNullableField("order_id", Schema.FieldType.INT32)
                        .addNullableField("sum_site_id0", Schema.FieldType.INT32)
                        .build())
                .addRows(
                    1, 1, 1, 3, 6, 2, null, null, 7, 2, null, null, 8, 3, null, null, null, null, 2,
                    5)
                .getStringRows());
    pipeline.run();
  }

  @Test(expected = IllegalArgumentException.class)
  public void testWindowsMismatch() throws Exception {
    String sql =
        "SELECT * FROM "
            + "(select site_id as order_id, sum(site_id) as sum_site_id FROM ORDER_DETAILS "
            + "          GROUP BY site_id, TUMBLE(order_time, INTERVAL '2' HOUR)) o1 "
            + " LEFT OUTER JOIN "
            + "(select order_id, sum(site_id) as sum_site_id FROM ORDER_DETAILS "
            + "          GROUP BY order_id, TUMBLE(order_time, INTERVAL '1' HOUR)) o2 "
            + " on "
            + " o1.order_id=o2.order_id";
    pipeline.enableAbandonedNodeEnforcement(false);
    compilePipeline(sql, pipeline);
    pipeline.run();
  }
}