/*
    * 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.project.collector;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.io.File;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.maven.execution.MavenExecutionRequest;
  import org.apache.maven.model.building.ModelProblem;
  import org.apache.maven.model.building.ModelProblemUtils;
  import org.apache.maven.project.MavenProject;
  import org.apache.maven.project.ProjectBuilder;
  import org.apache.maven.project.ProjectBuildingException;
  import org.apache.maven.project.ProjectBuildingRequest;
  import org.apache.maven.project.ProjectBuildingResult;
  import org.codehaus.plexus.util.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Utility to select projects for a given set of pom.xml files.
   */
  @Named
  @Singleton
  public class DefaultProjectsSelector implements ProjectsSelector {
      private static final Logger LOGGER = LoggerFactory.getLogger(DefaultProjectsSelector.class);
      private final ProjectBuilder projectBuilder;
  
      @Inject
      public DefaultProjectsSelector(ProjectBuilder projectBuilder) {
          this.projectBuilder = projectBuilder;
      }
  
      @Override
      public List<MavenProject> selectProjects(List<File> files, MavenExecutionRequest request)
              throws ProjectBuildingException {
          ProjectBuildingRequest projectBuildingRequest = request.getProjectBuildingRequest();
  
          boolean hasProjectSelection = !request.getProjectActivation().isEmpty();
          boolean isRecursive = hasProjectSelection || request.isRecursive();
          List<ProjectBuildingResult> results = projectBuilder.build(files, isRecursive, projectBuildingRequest);
  
          List<MavenProject> projects = new ArrayList<>(results.size());
  
          boolean problems = false;
  
          for (ProjectBuildingResult result : results) {
              projects.add(result.getProject());
  
              if (!result.getProblems().isEmpty() && LOGGER.isWarnEnabled()) {
                  LOGGER.warn("");
                  LOGGER.warn(
                          "Some problems were encountered while building the effective model for '{}'",
                          result.getProject().getId());
  
                  for (ModelProblem problem : result.getProblems()) {
                      String loc = ModelProblemUtils.formatLocation(problem, result.getProjectId());
                      LOGGER.warn("{}{}", problem.getMessage(), (StringUtils.isNotEmpty(loc) ? " @ " + loc : ""));
                  }
  
                  problems = true;
              }
          }
  
          if (problems) {
              LOGGER.warn("");
              LOGGER.warn("It is highly recommended to fix these problems"
                      + " because they threaten the stability of your build.");
              LOGGER.warn("");
              LOGGER.warn("For this reason, future Maven versions might no"
                      + " longer support building such malformed projects.");
              LOGGER.warn("");
          }
  
          return projects;
      }
  }