content: /*
   * 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.oss.driver.examples.mapper.killrvideo.video;
  
  import com.datastax.oss.driver.api.core.CqlSession;
  import com.datastax.oss.driver.api.core.cql.BatchStatement;
  import com.datastax.oss.driver.api.core.cql.BatchStatementBuilder;
  import com.datastax.oss.driver.api.core.cql.BoundStatement;
  import com.datastax.oss.driver.api.core.cql.BoundStatementBuilder;
  import com.datastax.oss.driver.api.core.cql.DefaultBatchType;
  import com.datastax.oss.driver.api.core.cql.PreparedStatement;
  import com.datastax.oss.driver.api.core.uuid.Uuids;
  import com.datastax.oss.driver.api.mapper.MapperContext;
  import com.datastax.oss.driver.api.mapper.entity.EntityHelper;
  import com.datastax.oss.driver.api.mapper.entity.saving.NullSavingStrategy;
  import java.time.Instant;
  import java.time.ZoneOffset;
  import java.time.format.DateTimeFormatter;
  
  /**
   * Provides the implementation of {@link VideoDao#create}.
   *
   * <p>Package-private visibility is sufficient, this will be called only from the generated DAO
   * implementation.
   */
  class CreateVideoQueryProvider {
  
    private final CqlSession session;
    private final EntityHelper<Video> videoHelper;
    private final EntityHelper<UserVideo> userVideoHelper;
    private final EntityHelper<LatestVideo> latestVideoHelper;
    private final EntityHelper<VideoByTag> videoByTagHelper;
    private final PreparedStatement preparedInsertVideo;
    private final PreparedStatement preparedInsertUserVideo;
    private final PreparedStatement preparedInsertLatestVideo;
    private final PreparedStatement preparedInsertVideoByTag;
  
    CreateVideoQueryProvider(
        MapperContext context,
        EntityHelper<Video> videoHelper,
        EntityHelper<UserVideo> userVideoHelper,
        EntityHelper<LatestVideo> latestVideoHelper,
        EntityHelper<VideoByTag> videoByTagHelper) {
      this.session = context.getSession();
      this.videoHelper = videoHelper;
      this.userVideoHelper = userVideoHelper;
      this.latestVideoHelper = latestVideoHelper;
      this.videoByTagHelper = videoByTagHelper;
  
      this.preparedInsertVideo = prepareInsert(session, videoHelper);
      this.preparedInsertUserVideo = prepareInsert(session, userVideoHelper);
      this.preparedInsertLatestVideo = prepareInsert(session, latestVideoHelper);
      this.preparedInsertVideoByTag = prepareInsert(session, videoByTagHelper);
    }
  
    void create(Video video) {
      if (video.getVideoid() == null) {
        video.setVideoid(Uuids.random());
      }
      if (video.getAddedDate() == null) {
        video.setAddedDate(Instant.now());
      }
  
      BatchStatementBuilder batch = BatchStatement.builder(DefaultBatchType.LOGGED);
      batch.addStatement(bind(preparedInsertVideo, video, videoHelper));
      batch.addStatement(bind(preparedInsertUserVideo, toUserVideo(video), userVideoHelper));
      batch.addStatement(bind(preparedInsertLatestVideo, toLatestVideo(video), latestVideoHelper));
      if (video.getTags() != null) {
        for (String tag : video.getTags()) {
          batch.addStatement(
              bind(preparedInsertVideoByTag, toVideoByTag(video, tag), videoByTagHelper));
        }
      }
      session.execute(batch.build());
    }
  
    private static <T> PreparedStatement prepareInsert(
        CqlSession session, EntityHelper<T> entityHelper) {
      return session.prepare(entityHelper.insert().asCql());
    }
  
    private static <T> BoundStatement bind(
        PreparedStatement preparedStatement, T entity, EntityHelper<T> entityHelper) {
      BoundStatementBuilder boundStatement = preparedStatement.boundStatementBuilder();
      entityHelper.set(entity, boundStatement, NullSavingStrategy.DO_NOT_SET, false);
      return boundStatement.build();
    }
  
    private static UserVideo toUserVideo(Video video) {
      return new UserVideo(
          video.getUserid(),
          video.getAddedDate(),
          video.getVideoid(),
          video.getName(),
          video.getPreviewImageLocation());
    }
  
    private static LatestVideo toLatestVideo(Video video) {
      return new LatestVideo(
          DAY_FORMATTER.format(video.getAddedDate()),
          video.getAddedDate(),
          video.getVideoid(),
          video.getUserid(),
          video.getName(),
          video.getPreviewImageLocation());
    }
  
    private static final DateTimeFormatter DAY_FORMATTER =
        DateTimeFormatter.ofPattern("yyyyMMdd").withZone(ZoneOffset.UTC);
  
    private static VideoByTag toVideoByTag(Video video, String tag) {
      return new VideoByTag(
          tag,
          video.getVideoid(),
          video.getAddedDate(),
          video.getUserid(),
          video.getName(),
          video.getPreviewImageLocation(),
          video.getAddedDate());
    }
  }
  