/*
    * Copyright (C) 2013 4th Line GmbH, Switzerland
    *
    * The contents of this file are subject to the terms of either the GNU
    * Lesser General Public License Version 2 or later ("LGPL") or the
    * Common Development and Distribution License Version 1 or later
    * ("CDDL") (collectively, the "License"). You may not use this file
    * except in compliance with the License. See LICENSE.txt for more
    * information.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   */
  package org.fourthline.cling.model.types;
  
  /**
   *
   * @author Mario Franco
   */
  public class BytesRange {
  
      public static final String PREFIX = "bytes=";
      
      private Long firstByte;
      private Long lastByte;
      private Long byteLength;
  
      public BytesRange(Long firstByte, Long lastByte) {
          this.firstByte = firstByte;
          this.lastByte = lastByte;
          this.byteLength = null;
      }
  
      public BytesRange(Long firstByte, Long lastByte, Long byteLength) {
          this.firstByte = firstByte;
          this.lastByte = lastByte;
          this.byteLength = byteLength;
      }
  
      /**
       * @return the firstByte
       */
      public Long getFirstByte() {
          return firstByte;
      }
  
      /**
       * @return the lastByte
       */
      public Long getLastByte() {
          return lastByte;
      }
  
      /**
       * @return the byteLength
       */
      public Long getByteLength() {
          return byteLength;
      }
  
      /**
       * 
       * @return String format of Bytes Range for response message header 
       */
      public String getString() {
          return getString(false,null);
      }
  
      /**
       * 
       * @return String format of Bytes Range for response message header 
       */
      public String getString(boolean includeDuration) {
          return getString(includeDuration,null);
      }
      
      /**
       * 
       * @return String format of Bytes Range for response message header 
       */
      public String getString(boolean includeDuration, String rangePrefix) {
          String s = (rangePrefix!=null)?rangePrefix:PREFIX;
  
          if (firstByte!=null)
              s += firstByte.toString();
          s += "-";
          if (lastByte!=null)
              s+= lastByte.toString();
          if (includeDuration) {
              s += "/" + (byteLength != null ? byteLength.toString() : "*");
          }
  
          return s;
      }
  
      public static BytesRange valueOf(String s) throws InvalidValueException {
          return valueOf(s,null);
      }
     
     public static BytesRange valueOf(String s, String rangePrefix) throws InvalidValueException {
         if (s.startsWith((rangePrefix!=null)?rangePrefix:PREFIX)) {
             Long firstByte=null, lastByte = null, byteLength = null;
             String[] params = s.substring( ((rangePrefix!=null)?rangePrefix:PREFIX).length()).split("[-/]");
             switch (params.length) {
                 case 3:
                     if (params[2].length() != 0 && !params[2].equals("*")) {
                         byteLength = Long.parseLong(params[2]);
                     }
                 case 2:
                     if (params[1].length() != 0) {
                         lastByte = Long.parseLong(params[1]);
                     }
                 case 1:
                     if (params[0].length() != 0) {
                         firstByte = Long.parseLong(params[0]);
                     }
                     if (firstByte!=null || lastByte!= null)
                         return new BytesRange(firstByte, lastByte, byteLength);
                 default:
                     break;
             }
         }
 
         throw new InvalidValueException("Can't parse Bytes Range: " + s);
     }
 }