/**
 * Copyright (C) 2014-2016 LinkedIn Corp. (pinot-core@linkedin.com)
 *
 * Licensed 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.linkedin.pinot.server.starter.helix;

import java.util.Iterator;
import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.ConfigurationException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.linkedin.pinot.common.segment.ReadMode;
import com.linkedin.pinot.core.data.manager.config.InstanceDataManagerConfig;


/**
 * The config used for HelixInstanceDataManager.
 *
 *
 */
public class HelixInstanceDataManagerConfig implements InstanceDataManagerConfig {
  private static final Logger LOGGER = LoggerFactory.getLogger(HelixInstanceDataManagerConfig.class);

  // Average number of values in multi-valued columns in any table in this instance.
  // This value is used to allocate initial memory for multi-valued columns in realtime segments in consuming state.
  private static final String AVERAGE_MV_COUNT = "realtime.averageMultiValueEntriesPerRow";
  private static final String INSTANCE_SEGMENT_METADATA_LOADER_CLASS = "segment.metadata.loader.class";
  // Key of instance id
  public static final String INSTANCE_ID = "id";
  // Key of instance data directory
  public static final String INSTANCE_DATA_DIR = "dataDir";
  // Key of instance segment tar directory
  public static final String INSTANCE_SEGMENT_TAR_DIR = "segmentTarDir";
  // Key of segment directory
  public static final String INSTANCE_BOOTSTRAP_SEGMENT_DIR = "bootstrap.segment.dir";
  // Key of table data directory
  public static final String kEY_OF_TABLE_DATA_DIRECTORY = "directory";
  // Key of table data directory
  public static final String kEY_OF_TABLE_NAME = "name";
  // Key of instance level segment read mode
  public static final String READ_MODE = "readMode";
  // Key of the segment format this server can read
  public static final String SEGMENT_FORMAT_VERSION = "segment.format.version";

  // Key of whether to enable default columns
  private static final String ENABLE_DEFAULT_COLUMNS = "enable.default.columns";

  private final static String[] REQUIRED_KEYS = { INSTANCE_ID, INSTANCE_DATA_DIR, READ_MODE };
  private Configuration _instanceDataManagerConfiguration = null;

  public HelixInstanceDataManagerConfig(Configuration serverConfig) throws ConfigurationException {
    _instanceDataManagerConfiguration = serverConfig;
    Iterator keysIterator = serverConfig.getKeys();
    while (keysIterator.hasNext()) {
      String key = (String) keysIterator.next();
      LOGGER.info("InstanceDataManagerConfig, key: {} , value: {}",  key,
          serverConfig.getProperty(key));
    }
    checkRequiredKeys();
  }

  private void checkRequiredKeys() throws ConfigurationException {
    for (String keyString : REQUIRED_KEYS) {
      if (!_instanceDataManagerConfiguration.containsKey(keyString)) {
        throw new ConfigurationException("Cannot find required key : " + keyString);
      }
    }
  }

  @Override
  public Configuration getConfig() {
    return _instanceDataManagerConfiguration;
  }

  @Override
  public String getInstanceId() {
    return _instanceDataManagerConfiguration.getString(INSTANCE_ID);
  }

  @Override
  public String getInstanceDataDir() {
    return _instanceDataManagerConfiguration.getString(INSTANCE_DATA_DIR);
  }

  @Override
  public String getInstanceSegmentTarDir() {
    return _instanceDataManagerConfiguration.getString(INSTANCE_SEGMENT_TAR_DIR);
  }

  @Override
  public String getInstanceBootstrapSegmentDir() {
    return _instanceDataManagerConfiguration.getString(INSTANCE_BOOTSTRAP_SEGMENT_DIR);
  }

  @Override
  public String getSegmentMetadataLoaderClass() {
    return _instanceDataManagerConfiguration.getString(INSTANCE_SEGMENT_METADATA_LOADER_CLASS);
  }

  @Override
  public ReadMode getReadMode() {
    return ReadMode.valueOf(_instanceDataManagerConfiguration.getString(READ_MODE));
  }

  @Override
  public String getSegmentFormatVersion() {
    return _instanceDataManagerConfiguration.getString(SEGMENT_FORMAT_VERSION);
  }

  @Override
  public boolean isEnableDefaultColumns() {
    return _instanceDataManagerConfiguration.getBoolean(ENABLE_DEFAULT_COLUMNS, false);
  }

  @Override
  public String getAvgMultiValueCount() {
    return _instanceDataManagerConfiguration.getString(AVERAGE_MV_COUNT, null);
  }

  @Override
  public String toString() {
    String configString = "";
    configString += "Instance Id: " + getInstanceId();
    configString += "\n\tInstance Data Dir: " + getInstanceDataDir();
    configString += "\n\tInstance Segment Tar Dir: " + getInstanceSegmentTarDir();
    configString += "\n\tBootstrap Segment Dir: " + getInstanceBootstrapSegmentDir();
    configString += "\n\tSegment Metadata Loader Clas: " + getSegmentMetadataLoaderClass();
    configString += "\n\tRead Mode: " + getReadMode();
    configString += "\n\tSegment format version: " + getSegmentFormatVersion();
    return configString;
  }
}