/**
    *
    * 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.hbase.util;
  
  import com.google.common.base.Joiner;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.List;
  import java.util.Objects;
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.hbase.HConstants;
  
  @InterfaceAudience.Private
  public class PrettyPrinter {
  
    public enum Unit {
      TIME_INTERVAL,
      NONE
    }
  
    public static String format(final String value, final Unit unit) {
      StringBuilder human = new StringBuilder();
      switch (unit) {
        case TIME_INTERVAL:
          human.append(humanReadableTTL(Long.parseLong(value)));
          break;
        default:
          human.append(value);
      }
      return human.toString();
    }
  
    @edu.umd.cs.findbugs.annotations.SuppressWarnings(value="ICAST_INTEGER_MULTIPLY_CAST_TO_LONG",
        justification="Will not overflow")
    private static String humanReadableTTL(final long interval){
      StringBuilder sb = new StringBuilder();
      int days, hours, minutes, seconds;
  
      // edge cases first
      if (interval == Integer.MAX_VALUE) {
        sb.append("FOREVER");
        return sb.toString();
      }
      if (interval < HConstants.MINUTE_IN_SECONDS) {
        sb.append(interval);
        sb.append(" SECOND").append(interval == 1 ? "" : "S");
        return sb.toString();
      }
  
      days  =   (int) (interval / HConstants.DAY_IN_SECONDS);
      hours =   (int) (interval - HConstants.DAY_IN_SECONDS * days) / HConstants.HOUR_IN_SECONDS;
      minutes = (int) (interval - HConstants.DAY_IN_SECONDS * days
          - HConstants.HOUR_IN_SECONDS * hours) / HConstants.MINUTE_IN_SECONDS;
      seconds = (int) (interval - HConstants.DAY_IN_SECONDS * days
          - HConstants.HOUR_IN_SECONDS * hours - HConstants.MINUTE_IN_SECONDS * minutes);
  
      sb.append(interval);
      sb.append(" SECONDS (");
  
      if (days > 0) {
        sb.append(days);
        sb.append(" DAY").append(days == 1 ? "" : "S");
      }
  
      if (hours > 0 ) {
        sb.append(days > 0 ? " " : "");
        sb.append(hours);
        sb.append(" HOUR").append(hours == 1 ? "" : "S");
      }
  
      if (minutes > 0) {
        sb.append(days + hours > 0 ? " " : "");
        sb.append(minutes);
        sb.append(" MINUTE").append(minutes == 1 ? "" : "S");
      }
  
      if (seconds > 0) {
        sb.append(days + hours + minutes > 0 ? " " : "");
        sb.append(seconds);
        sb.append(" SECOND").append(minutes == 1 ? "" : "S");
      }
  
     sb.append(")");
 
     return sb.toString();
   }
 
   /**
    * Pretty prints a collection of any type to a string. Relies on toString() implementation of the
    * object type.
    * @param collection collection to pretty print.
    * @return Pretty printed string for the collection.
    */
   public static String toString(Collection<?> collection) {
     List<String> stringList = new ArrayList<>();
     for (Object o: collection) {
       stringList.add(Objects.toString(o));
     }
     return "[" + Joiner.on(',').join(stringList) + "]";
   }
 
 }