/*
 * 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.planner.NodeStats;
import org.apache.beam.sdk.extensions.sql.meta.provider.test.TestBoundedTable;
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.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.junit.Assert;
import org.junit.BeforeClass;
import org.junit.Rule;
import org.junit.Test;

/** Test for {@code BeamValuesRel}. */
public class BeamValuesRelTest extends BaseRelTest {
  @Rule public final TestPipeline pipeline = TestPipeline.create();

  @BeforeClass
  public static void prepare() {
    registerTable(
        "string_table",
        TestBoundedTable.of(
            Schema.FieldType.STRING, "name",
            Schema.FieldType.STRING, "description"));
    registerTable(
        "int_table",
        TestBoundedTable.of(
            Schema.FieldType.INT32, "c0",
            Schema.FieldType.INT32, "c1"));
  }

  @Test
  public void testValues() throws Exception {
    String sql =
        "insert into string_table(name, description) values "
            + "('hello', 'world'), ('james', 'bond')";
    PCollection<Row> rows = compilePipeline(sql, pipeline);
    PAssert.that(rows)
        .containsInAnyOrder(
            TestUtils.RowsBuilder.of(
                    Schema.FieldType.STRING, "name",
                    Schema.FieldType.STRING, "description")
                .addRows(
                    "hello", "world",
                    "james", "bond")
                .getRows());
    pipeline.run();
  }

  @Test
  public void testValues_castInt() throws Exception {
    String sql = "insert into int_table (c0, c1) values(cast(1 as int), cast(2 as int))";
    PCollection<Row> rows = compilePipeline(sql, pipeline);
    PAssert.that(rows)
        .containsInAnyOrder(
            TestUtils.RowsBuilder.of(
                    Schema.FieldType.INT32, "c0",
                    Schema.FieldType.INT32, "c1")
                .addRows(1, 2)
                .getRows());
    pipeline.run();
  }

  @Test
  public void testValues_onlySelect() throws Exception {
    String sql = "select 1, '1'";
    PCollection<Row> rows = compilePipeline(sql, pipeline);
    PAssert.that(rows)
        .containsInAnyOrder(
            TestUtils.RowsBuilder.of(
                    Schema.FieldType.INT32, "EXPR$0",
                    Schema.FieldType.STRING, "EXPR$1")
                .addRows(1, "1")
                .getRows());
    pipeline.run();
  }

  @Test
  public void testValues_selectEmpty() throws Exception {
    String sql = "select 1, '1' FROM string_table WHERE false";
    PCollection<Row> rows = compilePipeline(sql, pipeline);
    PAssert.that(rows)
        .containsInAnyOrder(
            TestUtils.RowsBuilder.of(
                    Schema.FieldType.INT32, "EXPR$0",
                    Schema.FieldType.STRING, "EXPR$1")
                .getRows());
    pipeline.run();
  }

  @Test
  public void testNodeStatsEstimation() {
    String sql =
        "SELECT * FROM (VALUES ('value1'),('value2'),('value3'),('value4'),('value5'),"
            + " ('value6'),('value7'),('value8'),('value9'))";

    RelNode root = env.parseQuery(sql);

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

    NodeStats estimate = BeamSqlRelUtils.getNodeStats(root, root.getCluster().getMetadataQuery());

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

    Assert.assertEquals(9., estimate.getRowCount(), 0.01);
    Assert.assertEquals(9., estimate.getWindow(), 0.01);
  }
}
