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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.tools.command;

import java.io.PrintWriter;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.OptionBuilder;
import org.apache.commons.cli.Options;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.Path;

import org.apache.parquet.hadoop.Footer;
import org.apache.parquet.hadoop.ParquetFileReader;
import org.apache.parquet.hadoop.metadata.BlockMetaData;
import org.apache.parquet.tools.Main;

public class RowCountCommand extends ArgsOnlyCommand {
  private FileStatus[] inputFileStatuses;
  private Configuration conf;
  private Path inputPath;
  private PrintWriter out;
  public static final String[] USAGE = new String[] {
          "",
          "where  is the parquet file to count rows to stdout"
  };

  public static final Options OPTIONS;
  static {
    OPTIONS = new Options();
    Option detailed = OptionBuilder.withLongOpt("detailed")
            .withDescription("Detailed rowcount of each matching file")
            .create('d');
    OPTIONS.addOption(detailed);
  }

  public RowCountCommand() {
    super(1, 1);
  }

  @Override
  public Options getOptions() {
    return OPTIONS;
  }

  @Override
  public String[] getUsageDescription() {
    return USAGE;
  }

  @Override
  public String getCommandDescription() {
    return "Prints the count of rows in Parquet file(s)";
  }

  @Override
  public void execute(CommandLine options) throws Exception {
    super.execute(options);

    String[] args = options.getArgs();
    String input = args[0];
    out = new PrintWriter(Main.out, true);
    inputPath = new Path(input);
    conf = new Configuration();
    inputFileStatuses = inputPath.getFileSystem(conf).globStatus(inputPath);
    long rowCount = 0;

    for (FileStatus fs : inputFileStatuses) {
      long fileRowCount=0;
      for (Footer f : ParquetFileReader.readFooters(conf, fs, false)) {
        for (BlockMetaData b : f.getParquetMetadata().getBlocks()) {
          rowCount += b.getRowCount();
          fileRowCount += b.getRowCount();
        }
      }
      if (options.hasOption('d')) {
        out.format("%s row count: %d\n", fs.getPath().getName(), fileRowCount);
      }
    }

    out.format("Total RowCount: %d", rowCount);
    out.println();
  }
}