/*
    * 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.plugins.toolchain;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import org.codehaus.plexus.component.configurator.ComponentConfigurationException;
  import org.codehaus.plexus.component.configurator.ConfigurationListener;
  import org.codehaus.plexus.component.configurator.converters.AbstractConfigurationConverter;
  import org.codehaus.plexus.component.configurator.converters.lookup.ConverterLookup;
  import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator;
  import org.codehaus.plexus.configuration.PlexusConfiguration;
  
  /**
   * Custom Plexus ConfigurationConverter to instantiate <code>ToolchainRequirement</code> from configuration.
   *
   * @author mkleint
   * @see ToolchainsRequirement
   */
  public class ToolchainConverter extends AbstractConfigurationConverter {
  
      /**
       * @see org.codehaus.plexus.component.configurator.converters.ConfigurationConverter#canConvert(java.lang.Class)
       */
      @Override
      public boolean canConvert(Class type) {
          return ToolchainsRequirement.class.isAssignableFrom(type);
      }
  
      /**
       * @see org.codehaus.plexus.component.configurator.converters.ConfigurationConverter#fromConfiguration(org.codehaus.plexus.component.configurator.converters.lookup.ConverterLookup, org.codehaus.plexus.configuration.PlexusConfiguration, java.lang.Class, java.lang.Class, java.lang.ClassLoader, org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator, org.codehaus.plexus.component.configurator.ConfigurationListener)
       */
      @Override
      public Object fromConfiguration(
              ConverterLookup converterLookup,
              PlexusConfiguration configuration,
              Class type,
              Class baseType,
              ClassLoader classLoader,
              ExpressionEvaluator expressionEvaluator,
              ConfigurationListener listener)
              throws ComponentConfigurationException {
          ToolchainsRequirement retValue = new ToolchainsRequirement();
  
          processConfiguration(retValue, configuration, expressionEvaluator);
  
          return retValue;
      }
  
      private void processConfiguration(
              ToolchainsRequirement requirement,
              PlexusConfiguration configuration,
              ExpressionEvaluator expressionEvaluator)
              throws ComponentConfigurationException {
          Map<String, Map<String, String>> map = new HashMap<>();
  
          PlexusConfiguration[] tools = configuration.getChildren();
          for (PlexusConfiguration tool : tools) {
              String type = tool.getName();
              PlexusConfiguration[] params = tool.getChildren();
  
              Map<String, String> parameters = new HashMap<>();
              for (PlexusConfiguration param : params) {
                  parameters.put(param.getName(), param.getValue());
              }
              map.put(type, parameters);
          }
  
          requirement.toolchains = map;
      }
  }