/*
    * 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;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.maven.execution.MavenSession;
  import org.apache.maven.plugin.descriptor.PluginDescriptor;
  import org.apache.maven.project.MavenProject;
  import org.apache.maven.toolchain.model.ToolchainModel;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * @author mkleint
   */
  @Named
  @Singleton
  public class DefaultToolchainManager implements ToolchainManager {
      protected final Logger logger; // TODO this class is extended, needs refactoring
  
      final Map<String, ToolchainFactory> factories;
  
      @Inject
      public DefaultToolchainManager(Map<String, ToolchainFactory> factories) {
          this.factories = factories;
          this.logger = LoggerFactory.getLogger(DefaultToolchainManager.class);
      }
  
      /**
       * Ctor needed for UT.
       */
      DefaultToolchainManager(Map<String, ToolchainFactory> factories, Logger logger) {
          this.factories = factories;
          this.logger = requireNonNull(logger);
      }
  
      @Override
      public Toolchain getToolchainFromBuildContext(String type, MavenSession session) {
          Map<String, Object> context = retrieveContext(session);
  
          ToolchainModel model = (ToolchainModel) context.get(getStorageKey(type));
  
          if (model != null) {
              List<Toolchain> toolchains = selectToolchains(Collections.singletonList(model), type, null);
  
              if (!toolchains.isEmpty()) {
                  return toolchains.get(0);
              }
          }
  
          return null;
      }
  
      @Override
      public List<Toolchain> getToolchains(MavenSession session, String type, Map<String, String> requirements) {
          List<ToolchainModel> models = session.getRequest().getToolchains().get(type);
  
          return selectToolchains(models, type, requirements);
      }
  
      private List<Toolchain> selectToolchains(
              List<ToolchainModel> models, String type, Map<String, String> requirements) {
          List<Toolchain> toolchains = new ArrayList<>();
  
          if (models != null) {
              ToolchainFactory fact = factories.get(type);
  
              if (fact == null) {
                  logger.error(
                          "Missing toolchain factory for type: " + type + ". Possibly caused by misconfigured project.");
              } else {
                  for (ToolchainModel model : models) {
                     try {
                         ToolchainPrivate toolchain = fact.createToolchain(model);
                         if (requirements == null || toolchain.matchesRequirements(requirements)) {
                             toolchains.add(toolchain);
                         }
                     } catch (MisconfiguredToolchainException ex) {
                         logger.error("Misconfigured toolchain.", ex);
                     }
                 }
             }
         }
         return toolchains;
     }
 
     Map<String, Object> retrieveContext(MavenSession session) {
         Map<String, Object> context = null;
 
         if (session != null) {
             PluginDescriptor desc = new PluginDescriptor();
             desc.setGroupId(PluginDescriptor.getDefaultPluginGroupId());
             desc.setArtifactId(PluginDescriptor.getDefaultPluginArtifactId("toolchains"));
 
             MavenProject current = session.getCurrentProject();
 
             if (current != null) {
                 // TODO why is this using the context
                 context = session.getPluginContext(desc, current);
             }
         }
 
         return (context != null) ? context : new HashMap<>();
     }
 
     public static final String getStorageKey(String type) {
         return "toolchain-" + type; // NOI18N
     }
 }