/*
    * 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.maven.cli.transfer;
  
  import java.util.Locale;
  
  /**
   * Formats file size with the associated <a href="https://en.wikipedia.org/wiki/Metric_prefix">SI</a> prefix
   * (GB, MB, kB) and using the patterns <code>#0.0</code> for numbers between 1 and 10
   * and <code>###0</code> for numbers between 10 and 1000+ by default.
   *
   * @see <a href="https://en.wikipedia.org/wiki/Metric_prefix">https://en.wikipedia.org/wiki/Metric_prefix</a>
   * @see <a href="https://en.wikipedia.org/wiki/Binary_prefix">https://en.wikipedia.org/wiki/Binary_prefix</a>
   * @see <a
   *      href="https://en.wikipedia.org/wiki/Octet_%28computing%29">https://en.wikipedia.org/wiki/Octet_(computing)</a>
   */
  public class FileSizeFormat {
      public enum ScaleUnit {
          BYTE {
              @Override
              public long bytes() {
                  return 1L;
              }
  
              @Override
              public String symbol() {
                  return "B";
              }
          },
          KILOBYTE {
              @Override
              public long bytes() {
                  return 1000L;
              }
  
              @Override
              public String symbol() {
                  return "kB";
              }
          },
          MEGABYTE {
              @Override
              public long bytes() {
                  return KILOBYTE.bytes() * KILOBYTE.bytes();
              }
  
              @Override
              public String symbol() {
                  return "MB";
              }
          },
          GIGABYTE {
              @Override
              public long bytes() {
                  return MEGABYTE.bytes() * KILOBYTE.bytes();
              }
              ;
  
              @Override
              public String symbol() {
                  return "GB";
              }
          };
  
          public abstract long bytes();
  
          public abstract String symbol();
  
          public static ScaleUnit getScaleUnit(long size) {
              if (size < 0L) {
                  throw new IllegalArgumentException("file size cannot be negative: " + size);
              }
  
              if (size >= GIGABYTE.bytes()) {
                  return GIGABYTE;
              } else if (size >= MEGABYTE.bytes()) {
                  return MEGABYTE;
              } else if (size >= KILOBYTE.bytes()) {
                  return KILOBYTE;
              } else {
                  return BYTE;
              }
          }
     }
 
     public FileSizeFormat(Locale locale) {}
 
     public String format(long size) {
         return format(size, null);
     }
 
     public String format(long size, ScaleUnit unit) {
         return format(size, unit, false);
     }
 
     public String format(long size, ScaleUnit unit, boolean omitSymbol) {
         StringBuilder sb = new StringBuilder();
         format(sb, size, unit, omitSymbol);
         return sb.toString();
     }
 
     public void format(StringBuilder builder, long size) {
         format(builder, size, null, false);
     }
 
     public void format(StringBuilder builder, long size, ScaleUnit unit) {
         format(builder, size, unit, false);
     }
 
     @SuppressWarnings("checkstyle:magicnumber")
     private void format(StringBuilder builder, long size, ScaleUnit unit, boolean omitSymbol) {
         if (size < 0L) {
             throw new IllegalArgumentException("file size cannot be negative: " + size);
         }
         if (unit == null) {
             unit = ScaleUnit.getScaleUnit(size);
         }
 
         double scaledSize = (double) size / unit.bytes();
 
         if (unit == ScaleUnit.BYTE) {
             builder.append(size);
         } else if (scaledSize < 0.05d || scaledSize >= 10.0d) {
             builder.append(Math.round(scaledSize));
         } else {
             builder.append(Math.round(scaledSize * 10d) / 10d);
         }
 
         if (!omitSymbol) {
             builder.append(" ").append(unit.symbol());
         }
     }
 
     public String formatProgress(long progressedSize, long size) {
         StringBuilder sb = new StringBuilder();
         formatProgress(sb, progressedSize, size);
         return sb.toString();
     }
 
     public void formatProgress(StringBuilder builder, long progressedSize, long size) {
         if (progressedSize < 0L) {
             throw new IllegalArgumentException("progressed file size cannot be negative: " + size);
         }
         if (size >= 0 && progressedSize > size) {
             throw new IllegalArgumentException(
                     "progressed file size cannot be greater than size: " + progressedSize + " > " + size);
         }
 
         if (size >= 0L && progressedSize != size) {
             ScaleUnit unit = ScaleUnit.getScaleUnit(size);
             format(builder, progressedSize, unit, true);
             builder.append("/");
             format(builder, size, unit, false);
         } else {
             ScaleUnit unit = ScaleUnit.getScaleUnit(progressedSize);
 
             format(builder, progressedSize, unit, false);
         }
     }
 }