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/**
 * 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.parquet;

import org.apache.parquet.VersionParser.ParsedVersion;
import org.apache.parquet.column.Encoding;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class CorruptDeltaByteArrays {
  private static final Logger LOG = LoggerFactory.getLogger(CorruptStatistics.class);

  private static final SemanticVersion PARQUET_246_FIXED_VERSION = new SemanticVersion(1, 8, 0);

  public static boolean requiresSequentialReads(ParsedVersion version, Encoding encoding) {
    if (encoding != Encoding.DELTA_BYTE_ARRAY) {
      return false;
    }

    if (version == null) {
      return true;
    }

    if (!"parquet-mr".equals(version.application)) {
      // assume other applications don't have this bug
      return false;
    }

    if (!version.hasSemanticVersion()) {
      LOG.warn(
          "Requiring sequential reads because created_by did not "
              + "contain a valid version (see PARQUET-246): {}",
          version.version);
      return true;
    }

    return requiresSequentialReads(version.getSemanticVersion(), encoding);
  }

  public static boolean requiresSequentialReads(SemanticVersion semver, Encoding encoding) {
    if (encoding != Encoding.DELTA_BYTE_ARRAY) {
      return false;
    }

    if (semver == null) {
      return true;
    }

    if (semver.compareTo(PARQUET_246_FIXED_VERSION) < 0) {
      LOG.info(
          "Requiring sequential reads because this file was created " + "prior to {}. See PARQUET-246",
          PARQUET_246_FIXED_VERSION);
      return true;
    }

    // this file was created after the fix
    return false;
  }

  public static boolean requiresSequentialReads(String createdBy, Encoding encoding) {
    if (encoding != Encoding.DELTA_BYTE_ARRAY) {
      return false;
    }

    if (Strings.isNullOrEmpty(createdBy)) {
      LOG.info("Requiring sequential reads because file version is empty. See PARQUET-246");
      return true;
    }

    try {
      return requiresSequentialReads(VersionParser.parse(createdBy), encoding);
    } catch (RuntimeException | VersionParser.VersionParseException e) {
      warnParseError(createdBy, e);
      return true;
    }
  }

  private static void warnParseError(String createdBy, Throwable e) {
    LOG.warn(
        "Requiring sequential reads because created_by could not be " + "parsed (see PARQUET-246): "
            + createdBy,
        e);
  }
}