package org.apache.maven.shared.release.versions;
   
   /*
    * 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.
   */
  
  import org.apache.maven.artifact.Artifact;
  import org.apache.maven.artifact.ArtifactUtils;
  import org.apache.maven.artifact.versioning.DefaultArtifactVersion;
  import org.codehaus.plexus.util.StringUtils;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  import java.util.Locale;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  /**
   * This compares and increments versions for a common java versioning scheme.
   * <p/>
   * The supported version scheme has the following parts.<br>
   * <code><i>component-digits-annotation-annotationRevision-buildSpecifier</i></code><br>
   * Example:<br>
   * <code>my-component-1.0.1-alpha-2-SNAPSHOT</code>
   * <p/>
   * <ul>Terms:
   * <li><i>component</i> - name of the versioned component (log4j, commons-lang, etc)
   * <li><i>digits</i> - Numeric digits with at least one "." period. (1.0, 1.1, 1.01, 1.2.3, etc)
   * <li><i>annotationRevision</i> - Integer qualifier for the annotation. (4 as in RC-4)
   * <li><i>buildSpecifier</i> - Additional specifier for build. (SNAPSHOT, or build number like "20041114.081234-2")
   * </ul>
   * <b>Digits is the only required piece of the version string, and must contain at lease one "." period.</b>
   * <p/>
   * Implementation details:<br>
   * The separators "_" and "-" between components are also optional (though they are usually recommended).<br>
   * Example:<br>
   * <code>log4j-1.2.9-beta-9-SNAPSHOT == log4j1.2.9beta9SNAPSHOT == log4j_1.2.9_beta_9_SNAPSHOT</code>
   * <p/>
   * Leading zeros are significant when performing comparisons.
   * <p/>
   * TODO: this parser is better than DefaultArtifactVersion - replace it with this (but align naming) and then remove
   * this from here.
   */
  public class DefaultVersionInfo
      implements VersionInfo
  {
      private final String strVersion;
  
      private final List<String> digits;
  
      private String annotation;
  
      private String annotationRevision;
  
      private final String buildSpecifier;
  
      private String annotationSeparator;
  
      private String annotationRevSeparator;
  
      private final String buildSeparator;
  
      private static final int DIGITS_INDEX = 1;
  
      private static final int ANNOTATION_SEPARATOR_INDEX = 2;
  
      private static final int ANNOTATION_INDEX = 3;
  
      private static final int ANNOTATION_REV_SEPARATOR_INDEX = 4;
  
      private static final int ANNOTATION_REVISION_INDEX = 5;
  
      private static final int BUILD_SEPARATOR_INDEX = 6;
  
      private static final int BUILD_SPECIFIER_INDEX = 7;
  
      private static final String SNAPSHOT_IDENTIFIER = "SNAPSHOT";
  
      private static final String DIGIT_SEPARATOR_STRING = ".";
  
      public static final Pattern STANDARD_PATTERN = Pattern.compile(
          "^((?:\\d+\\.)*\\d+)"      // digit(s) and '.' repeated - followed by digit (version digits 1.22.0, etc)
          + "([-_])?"                // optional - or _  (annotation separator)
         + "([a-zA-Z]*)"            // alpha characters (looking for annotation - alpha, beta, RC, etc.)
         + "([-_])?"                // optional - or _  (annotation revision separator)
         + "(\\d*)"                 // digits  (any digits after rc or beta is an annotation revision)
         + "(?:([-_])?(.*?))?$" );  // - or _ followed everything else (build specifier)
 
     /* *
      * cmaki 02242009
      * FIX for non-digit release numbers, e.g. trunk-SNAPSHOT or just SNAPSHOT
      * This alternate pattern supports version numbers like:
      * trunk-SNAPSHOT
      * branchName-SNAPSHOT
      * SNAPSHOT
      */
     // for SNAPSHOT releases only (possible versions include: trunk-SNAPSHOT or SNAPSHOT)
     public static final Pattern ALTERNATE_PATTERN = Pattern.compile( "^(SNAPSHOT|[a-zA-Z]+[_-]SNAPSHOT)" );
 
     /**
      * Constructs this object and parses the supplied version string.
      *
      * @param version
      */
     public DefaultVersionInfo( String version )
         throws VersionParseException
     {
         strVersion = version;
 
         // FIX for non-digit release numbers, e.g. trunk-SNAPSHOT or just SNAPSHOT
         Matcher matcher = ALTERNATE_PATTERN.matcher( strVersion );
         // TODO: hack because it didn't support "SNAPSHOT"
         if ( matcher.matches() )
         {
             annotation = null;
             digits = null;
             buildSpecifier = version;
             buildSeparator = null;
             return;
         }
 
         Matcher m = STANDARD_PATTERN.matcher( strVersion );
         if ( m.matches() )
         {
             digits = parseDigits( m.group( DIGITS_INDEX ) );
             if ( !SNAPSHOT_IDENTIFIER.equals( m.group( ANNOTATION_INDEX ) ) )
             {
                 annotationSeparator = m.group( ANNOTATION_SEPARATOR_INDEX );
                 annotation = nullIfEmpty( m.group( ANNOTATION_INDEX ) );
 
                 if ( StringUtils.isNotEmpty( m.group( ANNOTATION_REV_SEPARATOR_INDEX ) )
                     && StringUtils.isEmpty( m.group( ANNOTATION_REVISION_INDEX ) ) )
                 {
                     // The build separator was picked up as the annotation revision separator
                     buildSeparator = m.group( ANNOTATION_REV_SEPARATOR_INDEX );
                     buildSpecifier = nullIfEmpty( m.group( BUILD_SPECIFIER_INDEX ) );
                 }
                 else
                 {
                     annotationRevSeparator = m.group( ANNOTATION_REV_SEPARATOR_INDEX );
                     annotationRevision = nullIfEmpty( m.group( ANNOTATION_REVISION_INDEX ) );
 
                     buildSeparator = m.group( BUILD_SEPARATOR_INDEX );
                     buildSpecifier = nullIfEmpty( m.group( BUILD_SPECIFIER_INDEX ) );
                 }
             }
             else
             {
                 // Annotation was "SNAPSHOT" so populate the build specifier with that data
                 buildSeparator = m.group( ANNOTATION_SEPARATOR_INDEX );
                 buildSpecifier = nullIfEmpty( m.group( ANNOTATION_INDEX ) );
             }
         }
         else
         {
             throw new VersionParseException( "Unable to parse the version string: \"" + version + "\"" );
         }
     }
 
     public DefaultVersionInfo( List<String> digits, String annotation, String annotationRevision, String buildSpecifier,
                                String annotationSeparator, String annotationRevSeparator, String buildSeparator )
     {
         this.digits = digits;
         this.annotation = annotation;
         this.annotationRevision = annotationRevision;
         this.buildSpecifier = buildSpecifier;
         this.annotationSeparator = annotationSeparator;
         this.annotationRevSeparator = annotationRevSeparator;
         this.buildSeparator = buildSeparator;
         this.strVersion = getVersionString( this, buildSpecifier, buildSeparator );
     }
 
     @Override
     public boolean isSnapshot()
     {
         return ArtifactUtils.isSnapshot( strVersion );
     }
 
     @Override
     public VersionInfo getNextVersion()
     {
         DefaultVersionInfo version = null;
         if ( digits != null )
         {
             List<String> digits = new ArrayList<>( this.digits );
             String annotationRevision = this.annotationRevision;
             if ( StringUtils.isNumeric( annotationRevision ) )
             {
                 annotationRevision = incrementVersionString( annotationRevision );
             }
             else
             {
                 digits.set( digits.size() - 1, incrementVersionString( digits.get( digits.size() - 1 ) ) );
             }
 
             version = new DefaultVersionInfo( digits, annotation, annotationRevision, buildSpecifier,
                                               annotationSeparator, annotationRevSeparator, buildSeparator );
         }
         return version;
     }
 
     /**
      * Compares this {@link DefaultVersionInfo} to the supplied {@link DefaultVersionInfo} to determine which version is
      * greater.
      *
      * @param obj the comparison version
      * @return the comparison value
      * @throws IllegalArgumentException if the components differ between the objects or if either of the annotations can
      *             not be determined.
      */
     @Override
     public int compareTo( VersionInfo obj )
     {
         DefaultVersionInfo that = (DefaultVersionInfo) obj;
 
         int result;
         // TODO: this is a workaround for a bug in DefaultArtifactVersion - fix there - 1.01 < 1.01.01
         if ( strVersion.startsWith( that.strVersion ) && !strVersion.equals( that.strVersion )
             && strVersion.charAt( that.strVersion.length() ) != '-' )
         {
             result = 1;
         }
         else if ( that.strVersion.startsWith( strVersion ) && !strVersion.equals( that.strVersion )
             && that.strVersion.charAt( strVersion.length() ) != '-' )
         {
             result = -1;
         }
         else
         {
             // TODO: this is a workaround for a bug in DefaultArtifactVersion - fix there - it should not consider case in comparing the qualifier
             // NOTE: The combination of upper-casing and lower-casing is an approximation of String.equalsIgnoreCase()
             String thisVersion = strVersion.toUpperCase( Locale.ENGLISH ).toLowerCase( Locale.ENGLISH );
             String thatVersion = that.strVersion.toUpperCase( Locale.ENGLISH ).toLowerCase( Locale.ENGLISH );
 
             result = new DefaultArtifactVersion( thisVersion ).compareTo( new DefaultArtifactVersion( thatVersion ) );
         }
         return result;
     }
 
     @Override
     public boolean equals( Object obj )
     {
         if ( !( obj instanceof DefaultVersionInfo ) )
         {
             return false;
         }
 
         return compareTo( (VersionInfo) obj ) == 0;
     }
 
     @Override
     public int hashCode()
     {
         return strVersion.toLowerCase( Locale.ENGLISH ).hashCode();
     }
 
     /**
      * Takes a string and increments it as an integer.
      * Preserves any lpad of "0" zeros.
      *
      * @param s
      */
     protected String incrementVersionString( String s )
     {
         int n = Integer.valueOf( s ).intValue() + 1;
         String value = String.valueOf( n );
         if ( value.length() < s.length() )
         {
             // String was left-padded with zeros
             value = StringUtils.leftPad( value, s.length(), "0" );
         }
         return value;
     }
 
     @Override
     public String getSnapshotVersionString()
     {
         if ( strVersion.equals( Artifact.SNAPSHOT_VERSION ) )
         {
             return strVersion;
         }
 
         String baseVersion = getReleaseVersionString();
 
         if ( baseVersion.length() > 0 )
         {
             baseVersion += "-";
         }
 
         return baseVersion + Artifact.SNAPSHOT_VERSION;
     }
 
     @Override
     public String getReleaseVersionString()
     {
         String baseVersion = strVersion;
 
         Matcher m = Artifact.VERSION_FILE_PATTERN.matcher( baseVersion );
         if ( m.matches() )
         {
             baseVersion = m.group( 1 );
         }
         // MRELEASE-623 SNAPSHOT is case-insensitive
         else if ( StringUtils.right( baseVersion, 9 ).equalsIgnoreCase( "-" + Artifact.SNAPSHOT_VERSION ) )
         {
             baseVersion = baseVersion.substring( 0, baseVersion.length() - Artifact.SNAPSHOT_VERSION.length() - 1 );
         }
         else if ( baseVersion.equals( Artifact.SNAPSHOT_VERSION ) )
         {
             baseVersion = "1.0";
         }
         return baseVersion;
     }
 
     @Override
     public String toString()
     {
         return strVersion;
     }
 
     protected static String getVersionString( DefaultVersionInfo info, String buildSpecifier, String buildSeparator )
     {
         StringBuilder sb = new StringBuilder();
 
         if ( info.digits != null )
         {
             sb.append( joinDigitString( info.digits ) );
         }
 
         if ( StringUtils.isNotEmpty( info.annotation ) )
         {
             sb.append( StringUtils.defaultString( info.annotationSeparator ) );
             sb.append( info.annotation );
         }
 
         if ( StringUtils.isNotEmpty( info.annotationRevision ) )
         {
             if ( StringUtils.isEmpty( info.annotation ) )
             {
                 sb.append( StringUtils.defaultString( info.annotationSeparator ) );
             }
             else
             {
                 sb.append( StringUtils.defaultString( info.annotationRevSeparator ) );
             }
             sb.append( info.annotationRevision );
         }
 
         if ( StringUtils.isNotEmpty( buildSpecifier ) )
         {
             sb.append( StringUtils.defaultString( buildSeparator ) );
             sb.append( buildSpecifier );
         }
 
         return sb.toString();
     }
 
     /**
      * Simply joins the items in the list with "." period
      *
      * @param digits
      */
     protected static String joinDigitString( List<String> digits )
     {
         return digits != null ? StringUtils.join( digits.iterator(), DIGIT_SEPARATOR_STRING ) : null;
     }
 
     /**
      * Splits the string on "." and returns a list
      * containing each digit.
      *
      * @param strDigits
      */
     private List<String> parseDigits( String strDigits )
     {
         return Arrays.asList( StringUtils.split( strDigits, DIGIT_SEPARATOR_STRING ) );
     }
 
     //--------------------------------------------------
     // Getters & Setters
     //--------------------------------------------------
 
     private static String nullIfEmpty( String s )
     {
         return StringUtils.isEmpty( s ) ? null : s;
     }
 
     public List<String> getDigits()
     {
         return digits;
     }
 
     public String getAnnotation()
     {
         return annotation;
     }
 
     public String getAnnotationRevision()
     {
         return annotationRevision;
     }
 
     public String getBuildSpecifier()
     {
         return buildSpecifier;
     }
 
 }