/*
    * 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.model.profile.activation;
  
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import org.apache.maven.model.Activation;
  import org.apache.maven.model.ActivationOS;
  import org.apache.maven.model.Profile;
  import org.apache.maven.model.building.ModelProblemCollector;
  import org.apache.maven.model.profile.ProfileActivationContext;
  import org.codehaus.plexus.util.Os;
  
  /**
   * Determines profile activation based on the operating system of the current runtime platform.
   *
   * @author Benjamin Bentmann
   * @see ActivationOS
   */
  @Named("os")
  @Singleton
  public class OperatingSystemProfileActivator implements ProfileActivator {
  
      @Override
      public boolean isActive(Profile profile, ProfileActivationContext context, ModelProblemCollector problems) {
          Activation activation = profile.getActivation();
  
          if (activation == null) {
              return false;
          }
  
          ActivationOS os = activation.getOs();
  
          if (os == null) {
              return false;
          }
  
          boolean active = ensureAtLeastOneNonNull(os);
  
          if (active && os.getFamily() != null) {
              active = determineFamilyMatch(os.getFamily());
          }
          if (active && os.getName() != null) {
              active = determineNameMatch(os.getName());
          }
          if (active && os.getArch() != null) {
              active = determineArchMatch(os.getArch());
          }
          if (active && os.getVersion() != null) {
              active = determineVersionMatch(os.getVersion());
          }
  
          return active;
      }
  
      @Override
      public boolean presentInConfig(Profile profile, ProfileActivationContext context, ModelProblemCollector problems) {
          Activation activation = profile.getActivation();
  
          if (activation == null) {
              return false;
          }
  
          ActivationOS os = activation.getOs();
  
          if (os == null) {
              return false;
          }
          return true;
      }
  
      private boolean ensureAtLeastOneNonNull(ActivationOS os) {
          return os.getArch() != null || os.getFamily() != null || os.getName() != null || os.getVersion() != null;
      }
  
      private boolean determineVersionMatch(String version) {
          String test = version;
          boolean reverse = false;
  
          if (test.startsWith("!")) {
              reverse = true;
              test = test.substring(1);
         }
 
         boolean result = Os.isVersion(test);
 
         return reverse ? !result : result;
     }
 
     private boolean determineArchMatch(String arch) {
         String test = arch;
         boolean reverse = false;
 
         if (test.startsWith("!")) {
             reverse = true;
             test = test.substring(1);
         }
 
         boolean result = Os.isArch(test);
 
         return reverse ? !result : result;
     }
 
     private boolean determineNameMatch(String name) {
         String test = name;
         boolean reverse = false;
 
         if (test.startsWith("!")) {
             reverse = true;
             test = test.substring(1);
         }
 
         boolean result = Os.isName(test);
 
         return reverse ? !result : result;
     }
 
     private boolean determineFamilyMatch(String family) {
         String test = family;
         boolean reverse = false;
 
         if (test.startsWith("!")) {
             reverse = true;
             test = test.substring(1);
         }
 
         boolean result = Os.isFamily(test);
 
         return reverse ? !result : result;
     }
 }