/*
    * 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.toolchain.java;
  
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.nio.file.Paths;
  import java.util.Map.Entry;
  import java.util.Properties;
  
  import org.apache.maven.toolchain.MisconfiguredToolchainException;
  import org.apache.maven.toolchain.RequirementMatcher;
  import org.apache.maven.toolchain.RequirementMatcherFactory;
  import org.apache.maven.toolchain.ToolchainFactory;
  import org.apache.maven.toolchain.ToolchainPrivate;
  import org.apache.maven.toolchain.model.ToolchainModel;
  import org.codehaus.plexus.util.xml.Xpp3Dom;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * JDK toolchain factory.
   * This is a <code>ToolchainFactory</code> Plexus component registered with
   * <code>jdk</code> hint.
   *
   * @since 2.0.9, renamed from <code>DefaultJavaToolchainFactory</code> in 3.2.4
   */
  @Named("jdk")
  @Singleton
  public class JavaToolchainFactory implements ToolchainFactory {
      private final Logger logger = LoggerFactory.getLogger(getClass());
  
      public ToolchainPrivate createToolchain(ToolchainModel model) throws MisconfiguredToolchainException {
          if (model == null) {
              return null;
          }
  
          // use DefaultJavaToolChain for compatibility with maven 3.2.3 and earlier
  
          @SuppressWarnings("deprecation")
          JavaToolchainImpl jtc = new DefaultJavaToolChain(model, logger);
  
          // populate the provides section
          Properties provides = model.getProvides();
          for (Entry<Object, Object> provide : provides.entrySet()) {
              String key = (String) provide.getKey();
              String value = (String) provide.getValue();
  
              if (value == null) {
                  throw new MisconfiguredToolchainException(
                          "Provides token '" + key + "' doesn't have any value configured.");
              }
  
              RequirementMatcher matcher;
              if ("version".equals(key)) {
                  matcher = RequirementMatcherFactory.createVersionMatcher(value);
              } else {
                  matcher = RequirementMatcherFactory.createExactMatcher(value);
              }
  
              jtc.addProvideToken(key, matcher);
          }
  
          // populate the configuration section
          Xpp3Dom dom = (Xpp3Dom) model.getConfiguration();
          Xpp3Dom javahome = dom != null ? dom.getChild(JavaToolchainImpl.KEY_JAVAHOME) : null;
          if (javahome == null) {
              throw new MisconfiguredToolchainException(
                      "Java toolchain without the " + JavaToolchainImpl.KEY_JAVAHOME + " configuration element.");
          }
          Path normal = Paths.get(javahome.getValue()).normalize();
          if (Files.exists(normal)) {
              jtc.setJavaHome(Paths.get(javahome.getValue()).normalize().toString());
          } else {
              throw new MisconfiguredToolchainException(
                      "Non-existing JDK home configuration at " + normal.toAbsolutePath());
          }
  
          return jtc;
      }
 
     public ToolchainPrivate createDefaultToolchain() {
         // not sure it's necessary to provide a default toolchain here.
         // only version can be eventually supplied, and
         return null;
     }
 
     protected Logger getLogger() {
         return logger;
     }
 }