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   * 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 com.datastax.dse.driver.api.core.metadata.schema;
  
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.assertj.core.api.Assertions.assertThatThrownBy;
  
  import com.datastax.oss.driver.api.core.CqlSession;
  import com.datastax.oss.driver.api.core.metadata.Metadata;
  import com.datastax.oss.driver.api.testinfra.ccm.CcmRule;
  import com.datastax.oss.driver.api.testinfra.requirement.BackendRequirement;
  import com.datastax.oss.driver.api.testinfra.requirement.BackendType;
  import com.datastax.oss.driver.api.testinfra.session.CqlSessionRuleBuilder;
  import com.datastax.oss.driver.api.testinfra.session.SessionRule;
  import com.datastax.oss.driver.categories.ParallelizableTests;
  import org.junit.ClassRule;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  import org.junit.rules.RuleChain;
  import org.junit.rules.TestRule;
  
  @Category(ParallelizableTests.class)
  @BackendRequirement(type = BackendType.DSE, minInclusive = "6.8")
  public class KeyspaceGraphMetadataIT {
  
    private static final CcmRule CCM_RULE = CcmRule.getInstance();
  
    private static final SessionRule<CqlSession> SESSION_RULE =
        new CqlSessionRuleBuilder(CCM_RULE).build();
  
    @ClassRule
    public static final TestRule CHAIN = RuleChain.outerRule(CCM_RULE).around(SESSION_RULE);
  
    @Test
    public void should_expose_graph_engine_if_set() {
      CqlSession session = SESSION_RULE.session();
      session.execute(
          "CREATE KEYSPACE keyspace_metadata_it_graph_engine "
              + "WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 1} "
              + "AND graph_engine = 'Core'");
      Metadata metadata = session.getMetadata();
      assertThat(metadata.getKeyspace("keyspace_metadata_it_graph_engine"))
          .hasValueSatisfying(
              keyspaceMetadata ->
                  assertThat(((DseGraphKeyspaceMetadata) keyspaceMetadata).getGraphEngine())
                      .hasValue("Core"));
    }
  
    @Test
    public void should_expose_graph_engine_if_keyspace_altered() {
      CqlSession session = SESSION_RULE.session();
      session.execute(
          "CREATE KEYSPACE keyspace_metadata_it_graph_engine_alter "
              + "WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 1}");
      assertThat(session.getMetadata().getKeyspace("keyspace_metadata_it_graph_engine_alter"))
          .hasValueSatisfying(
              keyspaceMetadata ->
                  assertThat(((DseGraphKeyspaceMetadata) keyspaceMetadata).getGraphEngine())
                      .isEmpty());
  
      session.execute(
          "ALTER KEYSPACE keyspace_metadata_it_graph_engine_alter WITH graph_engine = 'Core'");
      assertThat(session.getMetadata().getKeyspace("keyspace_metadata_it_graph_engine_alter"))
          .hasValueSatisfying(
              keyspaceMetadata ->
                  assertThat(((DseGraphKeyspaceMetadata) keyspaceMetadata).getGraphEngine())
                      .hasValue("Core"));
    }
  
    @Test
    public void should_not_allow_classic_graph_engine_to_be_specified_on_keyspace() {
      CqlSession session = SESSION_RULE.session();
      assertThatThrownBy(
              () ->
                  session.execute(
                      "CREATE KEYSPACE keyspace_metadata_it_graph_engine_classic "
                          + "WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 1} "
                          + "AND graph_engine = 'Classic'"))
          .hasMessageContaining("Invalid/unknown graph engine name 'Classic'");
    }
  
    @Test
    public void should_expose_core_graph_engine_if_set() {
      CqlSession session = SESSION_RULE.session();
      session.execute(
          "CREATE KEYSPACE keyspace_metadata_it_graph_engine_core "
              + "WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 1} "
              + "AND graph_engine = 'Core'");
      Metadata metadata = session.getMetadata();
      assertThat(metadata.getKeyspace("keyspace_metadata_it_graph_engine_core"))
          .hasValueSatisfying(
              keyspaceMetadata ->
                  assertThat(((DseGraphKeyspaceMetadata) keyspaceMetadata).getGraphEngine())
                      .hasValue("Core"));
    }
  
    @Test
    public void should_expose_empty_graph_engine_if_not_set() {
      // The default keyspace created by CcmRule has no graph engine
      Metadata metadata = SESSION_RULE.session().getMetadata();
      assertThat(metadata.getKeyspace(SESSION_RULE.keyspace()))
          .hasValueSatisfying(
              keyspaceMetadata ->
                  assertThat(((DseGraphKeyspaceMetadata) keyspaceMetadata).getGraphEngine())
                      .isEmpty());
    }
  }
  