/*
 * 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.io.jdbc.providers;

import static org.apache.beam.sdk.io.jdbc.JdbcUtil.MYSQL;
import static org.apache.beam.sdk.util.construction.BeamUrns.getUrn;

import com.google.auto.service.AutoService;
import org.apache.beam.model.pipeline.v1.ExternalTransforms;
import org.apache.beam.sdk.io.jdbc.JdbcReadSchemaTransformProvider;
import org.apache.beam.sdk.schemas.transforms.SchemaTransform;
import org.apache.beam.sdk.schemas.transforms.SchemaTransformProvider;
import org.checkerframework.checker.initialization.qual.Initialized;
import org.checkerframework.checker.nullness.qual.NonNull;
import org.checkerframework.checker.nullness.qual.UnknownKeyFor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@AutoService(SchemaTransformProvider.class)
public class ReadFromMySqlSchemaTransformProvider extends JdbcReadSchemaTransformProvider {

  private static final Logger LOG =
      LoggerFactory.getLogger(ReadFromMySqlSchemaTransformProvider.class);

  @Override
  public @UnknownKeyFor @NonNull @Initialized String identifier() {
    return getUrn(ExternalTransforms.ManagedTransforms.Urns.MYSQL_READ);
  }

  @Override
  public String description() {
    return inheritedDescription("MySQL", "ReadFromMySql", "mysql", 3306);
  }

  @Override
  protected String jdbcType() {
    return MYSQL;
  }

  @Override
  public @UnknownKeyFor @NonNull @Initialized SchemaTransform from(
      JdbcReadSchemaTransformConfiguration configuration) {
    String jdbcType = configuration.getJdbcType();
    if (jdbcType != null && !jdbcType.isEmpty() && !jdbcType.equals(jdbcType())) {
      LOG.warn(
          "Wrong JDBC type. Expected '{}' but got '{}'. Overriding with '{}'.",
          jdbcType(),
          jdbcType,
          jdbcType());
      configuration = configuration.toBuilder().setJdbcType(jdbcType()).build();
    }

    Integer fetchSize = configuration.getFetchSize();
    if (fetchSize != null
        && fetchSize > 0
        && configuration.getJdbcUrl() != null
        && !configuration.getJdbcUrl().contains("useCursorFetch=true")) {
      throw new IllegalArgumentException(
          "It is required to set useCursorFetch=true"
              + " in the JDBC URL when using fetchSize for MySQL");
    }
    return new MySqlReadSchemaTransform(configuration);
  }

  public static class MySqlReadSchemaTransform extends JdbcReadSchemaTransform {
    public MySqlReadSchemaTransform(JdbcReadSchemaTransformConfiguration config) {
      super(config, MYSQL);
    }
  }
}
