/**
    * Copyright 2009-2012 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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.codehaus.mojo.properties;
  
  import java.util.Properties;
  
  import org.apache.commons.lang.StringUtils;
  import org.apache.maven.plugin.AbstractMojo;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.project.MavenProject;
  
  /**
   * Parse version number properties into [major].[minor].[incremental].[qualifier] and [trimmed]. The version parsing
   * logic is crudely simple. It splits the version string into tokens using both "." and "-" as delimiters. It assumes
   * the first token is "major", the second token is "minor" the third token is "incremental" and any tokens after that
   * are "qualifier". "SNAPSHOT" is always omitted from qualifier.
   *
   * [trimmed] is the full version minus "-SNAPSHOT"
   *
   * @goal parse-version-properties
   */
  public class ParseVersionPropertiesMojo extends AbstractMojo {
      public static final String MAVEN_SNAPSHOT_TOKEN = "SNAPSHOT";
  
      /**
       * @parameter default-value="${project}"
       * @required
       * @readonly
       */
      private MavenProject project;
  
      /**
       * The list of properties containing version numbers to parse
       *
       * @parameter
       * @required
       */
      private String[] properties;
  
      /**
       * If true, the plugin will emit no logging messages
       *
       * @parameter expression="${properties.silent}" default-value="false"
       * @required
       */
      private boolean silent;
  
      @Override
      public void execute() throws MojoExecutionException {
          Properties props = project.getProperties();
          for (String key : properties) {
              String value = getProperty(key);
              if (StringUtils.isBlank(value)) {
                  continue;
              }
              Version version = parseVersion(value);
              setProjectProperty(key, "major", version.getMajor(), props);
              setProjectProperty(key, "minor", version.getMinor(), props);
              setProjectProperty(key, "incremental", version.getIncremental(), props);
              setProjectProperty(key, "qualifier", version.getQualifier(), props);
              setProjectProperty(key, "trimmed", trimSnapshot(value), props);
          }
      }
  
      protected String trimSnapshot(String version) {
          if (version.toUpperCase().endsWith("-" + MAVEN_SNAPSHOT_TOKEN)) {
              int length = MAVEN_SNAPSHOT_TOKEN.length() + 1;
              return StringUtils.left(version, version.length() - length);
          } else {
              return version;
          }
      }
  
      protected void setProjectProperty(String key, String suffix, String value, Properties props) {
          if (StringUtils.isBlank(value)) {
              return;
          }
          props.setProperty(key + "." + suffix, value);
          if (!silent) {
              getLog().info("Setting " + key + "." + suffix + "=" + value);
          }
      }
  
      protected Version parseVersion(String s) {
          boolean snapshot = s.toUpperCase().endsWith("-" + MAVEN_SNAPSHOT_TOKEN);
          Version version = new Version();
         version.setSnapshot(snapshot);
         String[] tokens = StringUtils.split(s, ".-");
         if (tokens.length > 0) {
             version.setMajor(tokens[0]);
         }
         if (tokens.length > 1) {
             version.setMinor(tokens[1]);
         }
         if (tokens.length > 2) {
             version.setIncremental(tokens[2]);
         }
         String qualifier = getQualifier(tokens);
         version.setQualifier(qualifier);
         return version;
     }
 
     protected String getQualifier(String[] tokens) {
         if (tokens.length <= 3) {
             return null;
         }
         StringBuilder sb = new StringBuilder();
         for (int i = 3; i < tokens.length; i++) {
             if (tokens[i].toUpperCase().equals(MAVEN_SNAPSHOT_TOKEN)) {
                 break;
             }
             if (i != 3) {
                 sb.append("-");
             }
             sb.append(tokens[i]);
         }
         return sb.toString();
     }
 
     protected String getProperty(String key) {
         String sys = System.getProperty(key);
         String proj = project.getProperties().getProperty(key);
         if (!StringUtils.isBlank(sys)) {
             return sys;
         } else {
             return proj;
         }
 
     }
 
     public String[] getProperties() {
         return properties;
     }
 
     public void setProperties(String[] properties) {
         this.properties = properties;
     }
 
     public boolean isSilent() {
         return silent;
     }
 
     public void setSilent(boolean silent) {
         this.silent = silent;
     }
 }