/*
 * 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.hadoop.hdds.utils.db;

import java.nio.file.Path;
import org.apache.commons.lang3.builder.EqualsBuilder;
import org.apache.commons.lang3.builder.HashCodeBuilder;
import org.apache.hadoop.hdds.StringUtils;
import org.apache.hadoop.hdds.utils.db.managed.ManagedColumnFamilyOptions;
import org.rocksdb.ColumnFamilyDescriptor;
import org.rocksdb.RocksDBException;

/**
 * Class that maintains Table Configuration.
 */
public class TableConfig implements AutoCloseable {

  private final String name;
  private final ManagedColumnFamilyOptions columnFamilyOptions;

  public static String toName(byte[] bytes) {
    return StringUtils.bytes2String(bytes);
  }

  /**
   * Constructs a Table Config.
   *
   * @param name                - Name of the Table.
   * @param columnFamilyOptions - Column Family options.
   */
  public TableConfig(String name, ManagedColumnFamilyOptions columnFamilyOptions) {
    this.name = name;
    this.columnFamilyOptions = columnFamilyOptions;
  }

  static TableConfig newTableConfig(Path dbPath, String name) {
    ManagedColumnFamilyOptions cfOptions = null;
    try {
      cfOptions = DBConfigFromFile.readCFOptionsFromFile(dbPath, name);
    } catch (RocksDBException ignored) {

    }
    if (cfOptions == null) {
      cfOptions = DBStoreBuilder.HDDS_DEFAULT_DB_PROFILE.getColumnFamilyOptions();
    }
    return new TableConfig(name, cfOptions);
  }

  /**
   * Returns the Name for this Table.
   * @return - Name String
   */
  public String getName() {
    return name;
  }

  /**
   * Returns a ColumnFamilyDescriptor for this table.
   * @return ColumnFamilyDescriptor
   */
  public ColumnFamilyDescriptor getDescriptor() {
    return new ColumnFamilyDescriptor(StringUtils.string2Bytes(name),
        new ManagedColumnFamilyOptions(columnFamilyOptions));
  }

  /**
   * Returns Column family options for this Table.
   * @return  ColumnFamilyOptions used for the Table.
   */
  public ManagedColumnFamilyOptions getColumnFamilyOptions() {
    return columnFamilyOptions;
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }

    if (o == null || getClass() != o.getClass()) {
      return false;
    }

    TableConfig that = (TableConfig) o;
    return new EqualsBuilder()
        .append(getName(), that.getName())
        .isEquals();
  }

  @Override
  public int hashCode() {
    return new HashCodeBuilder(17, 37)
        .append(getName())
        .toHashCode();
  }

  @Override
  public String toString() {
    return getName();
  }

  @Override
  public void close() {
    if (!columnFamilyOptions.isReused()) {
      columnFamilyOptions.close();
    }
  }
}
