/*
 * 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.hudi;

import org.apache.hudi.client.HoodieReadClient;
import org.apache.hudi.client.HoodieWriteClient;
import org.apache.hudi.client.WriteStatus;
import org.apache.hudi.common.config.TypedProperties;
import org.apache.hudi.common.model.HoodieKey;
import org.apache.hudi.common.model.HoodieRecord;
import org.apache.hudi.common.model.HoodieRecordPayload;
import org.apache.hudi.common.model.WriteOperationType;
import org.apache.hudi.common.util.Option;
import org.apache.hudi.common.util.ReflectionUtils;
import org.apache.hudi.common.util.StringUtils;
import org.apache.hudi.common.util.TablePathUtils;
import org.apache.hudi.config.HoodieCompactionConfig;
import org.apache.hudi.config.HoodieIndexConfig;
import org.apache.hudi.config.HoodieWriteConfig;
import org.apache.hudi.exception.HoodieException;
import org.apache.hudi.exception.HoodieNotSupportedException;
import org.apache.hudi.exception.TableNotFoundException;
import org.apache.hudi.hive.HiveSyncConfig;
import org.apache.hudi.hive.SlashEncodedDayPartitionValueExtractor;
import org.apache.hudi.index.HoodieIndex;
import org.apache.hudi.keygen.KeyGenerator;
import org.apache.hudi.keygen.parser.AbstractHoodieDateTimeParser;
import org.apache.hudi.table.BulkInsertPartitioner;

import org.apache.avro.generic.GenericRecord;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;

/**
 * Utilities used throughout the data source.
 */
public class DataSourceUtils {

  private static final Logger LOG = LogManager.getLogger(DataSourceUtils.class);

  public static String getTablePath(FileSystem fs, Path[] userProvidedPaths) throws IOException {
    LOG.info("Getting table path..");
    for (Path path : userProvidedPaths) {
      try {
        Option<Path> tablePath = TablePathUtils.getTablePath(fs, path);
        if (tablePath.isPresent()) {
          return tablePath.get().toString();
        }
      } catch (HoodieException he) {
        LOG.warn("Error trying to get table path from " + path.toString(), he);
      }
    }

    throw new TableNotFoundException("Unable to find a hudi table for the user provided paths.");
  }

  /**
   * Create a key generator class via reflection, passing in any configs needed.
   * <p>
   * If the class name of key generator is configured through the properties file, i.e., {@code props}, use the corresponding key generator class; otherwise, use the default key generator class
   * specified in {@code DataSourceWriteOptions}.
   */
  public static KeyGenerator createKeyGenerator(TypedProperties props) throws IOException {
    String keyGeneratorClass = props.getString(DataSourceWriteOptions.KEYGENERATOR_CLASS_OPT_KEY(),
        DataSourceWriteOptions.DEFAULT_KEYGENERATOR_CLASS_OPT_VAL());
    try {
      return (KeyGenerator) ReflectionUtils.loadClass(keyGeneratorClass, props);
    } catch (Throwable e) {
      throw new IOException("Could not load key generator class " + keyGeneratorClass, e);
    }
  }

  /**
   * Create a date time parser class for TimestampBasedKeyGenerator, passing in any configs needed.
   */
  public static AbstractHoodieDateTimeParser createDateTimeParser(TypedProperties props, String parserClass) throws IOException {
    try {
      return (AbstractHoodieDateTimeParser) ReflectionUtils.loadClass(parserClass, props);
    } catch (Throwable e) {
      throw new IOException("Could not load date time parser class " + parserClass, e);
    }
  }

  /**
   * Create a UserDefinedBulkInsertPartitioner class via reflection,
   * <br>
   * if the class name of UserDefinedBulkInsertPartitioner is configured through the HoodieWriteConfig.
   *
   * @see HoodieWriteConfig#getUserDefinedBulkInsertPartitionerClass()
   */
  private static Option<BulkInsertPartitioner> createUserDefinedBulkInsertPartitioner(HoodieWriteConfig config)
      throws HoodieException {
    String bulkInsertPartitionerClass = config.getUserDefinedBulkInsertPartitionerClass();
    try {
      return StringUtils.isNullOrEmpty(bulkInsertPartitionerClass)
          ? Option.empty() :
          Option.of((BulkInsertPartitioner) ReflectionUtils.loadClass(bulkInsertPartitionerClass));
    } catch (Throwable e) {
      throw new HoodieException("Could not create UserDefinedBulkInsertPartitioner class " + bulkInsertPartitionerClass, e);
    }
  }

  /**
   * Create a payload class via reflection, passing in an ordering/precombine value.
   */
  public static HoodieRecordPayload createPayload(String payloadClass, GenericRecord record, Comparable orderingVal)
      throws IOException {
    try {
      return (HoodieRecordPayload) ReflectionUtils.loadClass(payloadClass,
          new Class<?>[] {GenericRecord.class, Comparable.class}, record, orderingVal);
    } catch (Throwable e) {
      throw new IOException("Could not create payload for class: " + payloadClass, e);
    }
  }

  public static void checkRequiredProperties(TypedProperties props, List<String> checkPropNames) {
    checkPropNames.forEach(prop -> {
      if (!props.containsKey(prop)) {
        throw new HoodieNotSupportedException("Required property " + prop + " is missing");
      }
    });
  }

  public static HoodieWriteConfig createHoodieConfig(String schemaStr, String basePath,
      String tblName, Map<String, String> parameters) {
    boolean asyncCompact = Boolean.parseBoolean(parameters.get(DataSourceWriteOptions.ASYNC_COMPACT_ENABLE_OPT_KEY()));
    boolean inlineCompact = !asyncCompact && parameters.get(DataSourceWriteOptions.TABLE_TYPE_OPT_KEY())
        .equals(DataSourceWriteOptions.MOR_TABLE_TYPE_OPT_VAL());
    // insert/bulk-insert combining to be true, if filtering for duplicates
    boolean combineInserts = Boolean.parseBoolean(parameters.get(DataSourceWriteOptions.INSERT_DROP_DUPS_OPT_KEY()));
    HoodieWriteConfig.Builder builder = HoodieWriteConfig.newBuilder()
        .withPath(basePath).withAutoCommit(false).combineInput(combineInserts, true);
    if (schemaStr != null) {
      builder = builder.withSchema(schemaStr);
    }

    return builder.forTable(tblName)
        .withIndexConfig(HoodieIndexConfig.newBuilder().withIndexType(HoodieIndex.IndexType.BLOOM).build())
        .withCompactionConfig(HoodieCompactionConfig.newBuilder()
            .withPayloadClass(parameters.get(DataSourceWriteOptions.PAYLOAD_CLASS_OPT_KEY()))
            .withInlineCompaction(inlineCompact).build())
        // override above with Hoodie configs specified as options.
        .withProps(parameters).build();
  }

  public static HoodieWriteClient createHoodieClient(JavaSparkContext jssc, String schemaStr, String basePath,
      String tblName, Map<String, String> parameters) {
    return new HoodieWriteClient<>(jssc, createHoodieConfig(schemaStr, basePath, tblName, parameters), true);
  }

  public static JavaRDD<WriteStatus> doWriteOperation(HoodieWriteClient client, JavaRDD<HoodieRecord> hoodieRecords,
      String instantTime, WriteOperationType operation) throws HoodieException {
    switch (operation) {
      case BULK_INSERT:
        Option<BulkInsertPartitioner> userDefinedBulkInsertPartitioner =
                createUserDefinedBulkInsertPartitioner(client.getConfig());
        return client.bulkInsert(hoodieRecords, instantTime, userDefinedBulkInsertPartitioner);
      case INSERT:
        return client.insert(hoodieRecords, instantTime);
      case UPSERT:
        return client.upsert(hoodieRecords, instantTime);
      default:
        throw new HoodieException("Not a valid operation type for doWriteOperation: " + operation.toString());
    }
  }

  public static JavaRDD<WriteStatus> doDeleteOperation(HoodieWriteClient client, JavaRDD<HoodieKey> hoodieKeys,
      String instantTime) {
    return client.delete(hoodieKeys, instantTime);
  }

  public static HoodieRecord createHoodieRecord(GenericRecord gr, Comparable orderingVal, HoodieKey hKey,
      String payloadClass) throws IOException {
    HoodieRecordPayload payload = DataSourceUtils.createPayload(payloadClass, gr, orderingVal);
    return new HoodieRecord<>(hKey, payload);
  }

  /**
   * Drop records already present in the dataset.
   *
   * @param jssc JavaSparkContext
   * @param incomingHoodieRecords HoodieRecords to deduplicate
   * @param writeConfig HoodieWriteConfig
   */
  @SuppressWarnings("unchecked")
  public static JavaRDD<HoodieRecord> dropDuplicates(JavaSparkContext jssc, JavaRDD<HoodieRecord> incomingHoodieRecords,
      HoodieWriteConfig writeConfig) {
    try {
      HoodieReadClient client = new HoodieReadClient<>(jssc, writeConfig);
      return client.tagLocation(incomingHoodieRecords)
          .filter(r -> !((HoodieRecord<HoodieRecordPayload>) r).isCurrentLocationKnown());
    } catch (TableNotFoundException e) {
      // this will be executed when there is no hoodie table yet
      // so no dups to drop
      return incomingHoodieRecords;
    }
  }

  @SuppressWarnings("unchecked")
  public static JavaRDD<HoodieRecord> dropDuplicates(JavaSparkContext jssc, JavaRDD<HoodieRecord> incomingHoodieRecords,
      Map<String, String> parameters) {
    HoodieWriteConfig writeConfig =
        HoodieWriteConfig.newBuilder().withPath(parameters.get("path")).withProps(parameters).build();
    return dropDuplicates(jssc, incomingHoodieRecords, writeConfig);
  }

  public static HiveSyncConfig buildHiveSyncConfig(TypedProperties props, String basePath, String baseFileFormat) {
    checkRequiredProperties(props, Collections.singletonList(DataSourceWriteOptions.HIVE_TABLE_OPT_KEY()));
    HiveSyncConfig hiveSyncConfig = new HiveSyncConfig();
    hiveSyncConfig.basePath = basePath;
    hiveSyncConfig.usePreApacheInputFormat =
        props.getBoolean(DataSourceWriteOptions.HIVE_USE_PRE_APACHE_INPUT_FORMAT_OPT_KEY(),
            Boolean.parseBoolean(DataSourceWriteOptions.DEFAULT_USE_PRE_APACHE_INPUT_FORMAT_OPT_VAL()));
    hiveSyncConfig.databaseName = props.getString(DataSourceWriteOptions.HIVE_DATABASE_OPT_KEY(),
        DataSourceWriteOptions.DEFAULT_HIVE_DATABASE_OPT_VAL());
    hiveSyncConfig.tableName = props.getString(DataSourceWriteOptions.HIVE_TABLE_OPT_KEY());
    hiveSyncConfig.baseFileFormat = baseFileFormat;
    hiveSyncConfig.hiveUser =
        props.getString(DataSourceWriteOptions.HIVE_USER_OPT_KEY(), DataSourceWriteOptions.DEFAULT_HIVE_USER_OPT_VAL());
    hiveSyncConfig.hivePass =
        props.getString(DataSourceWriteOptions.HIVE_PASS_OPT_KEY(), DataSourceWriteOptions.DEFAULT_HIVE_PASS_OPT_VAL());
    hiveSyncConfig.jdbcUrl =
        props.getString(DataSourceWriteOptions.HIVE_URL_OPT_KEY(), DataSourceWriteOptions.DEFAULT_HIVE_URL_OPT_VAL());
    hiveSyncConfig.partitionFields =
        props.getStringList(DataSourceWriteOptions.HIVE_PARTITION_FIELDS_OPT_KEY(), ",", new ArrayList<>());
    hiveSyncConfig.partitionValueExtractorClass =
        props.getString(DataSourceWriteOptions.HIVE_PARTITION_EXTRACTOR_CLASS_OPT_KEY(),
            SlashEncodedDayPartitionValueExtractor.class.getName());
    hiveSyncConfig.useJdbc = Boolean.valueOf(props.getString(DataSourceWriteOptions.HIVE_USE_JDBC_OPT_KEY(),
        DataSourceWriteOptions.DEFAULT_HIVE_USE_JDBC_OPT_VAL()));
    hiveSyncConfig.autoCreateDatabase = Boolean.valueOf(props.getString(DataSourceWriteOptions.HIVE_AUTO_CREATE_DATABASE_OPT_KEY(),
        DataSourceWriteOptions.DEFAULT_HIVE_AUTO_CREATE_DATABASE_OPT_KEY()));
    hiveSyncConfig.skipROSuffix = Boolean.valueOf(props.getString(DataSourceWriteOptions.HIVE_SKIP_RO_SUFFIX(),
        DataSourceWriteOptions.DEFAULT_HIVE_SKIP_RO_SUFFIX_VAL()));
    return hiveSyncConfig;
  }
}