/*
    * 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.dependency.analyze;
  
  import javax.inject.Inject;
  
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.LinkedHashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import java.util.stream.Collectors;
  
  import org.apache.maven.artifact.Artifact;
  import org.apache.maven.model.Dependency;
  import org.apache.maven.model.DependencyManagement;
  import org.apache.maven.model.Exclusion;
  import org.apache.maven.plugin.AbstractMojo;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugin.MojoFailureException;
  import org.apache.maven.plugins.annotations.Mojo;
  import org.apache.maven.plugins.annotations.Parameter;
  import org.apache.maven.plugins.annotations.ResolutionScope;
  import org.apache.maven.project.MavenProject;
  
  /**
   * This mojo looks at the dependencies after final resolution and looks for mismatches in your dependencyManagement
   * section. This mojo is also useful for detecting projects that override the dependencyManagement directly.
   * Set ignoreDirect to false to detect these otherwise normal conditions.
   *
   * @author <a href="mailto:brianefox@gmail.com">Brian Fox</a>
   * @since 2.0-alpha-3
   */
  @Mojo(name = "analyze-dep-mgt", requiresDependencyResolution = ResolutionScope.TEST, threadSafe = true)
  public class AnalyzeDepMgt extends AbstractMojo {
      // fields -----------------------------------------------------------------
  
      private final MavenProject project;
  
      /**
       * Fail the build if a problem is detected.
       */
      @Parameter(property = "mdep.analyze.failBuild", defaultValue = "false")
      private boolean failBuild = false;
  
      /**
       * Ignore Direct Dependency Overrides of dependencyManagement section.
       */
      @Parameter(property = "mdep.analyze.ignore.direct", defaultValue = "true")
      private boolean ignoreDirect = true;
  
      /**
       * Skip plugin execution completely.
       *
       * @since 2.7
       */
      @Parameter(property = "mdep.analyze.skip", defaultValue = "false")
      private boolean skip;
  
      @Inject
      public AnalyzeDepMgt(MavenProject project) {
          this.project = project;
      }
  
      // Mojo methods -----------------------------------------------------------
  
      /*
       * @see org.apache.maven.plugin.Mojo#execute()
       */
      @Override
      public void execute() throws MojoExecutionException, MojoFailureException {
          if (skip) {
              getLog().info("Skipping plugin execution");
              return;
          }
  
          boolean result = checkDependencyManagement();
          if (result) {
              if (this.failBuild) {
  
                  throw new MojoExecutionException("Found Dependency errors.");
              } else {
                 getLog().warn("Potential problems found in Dependency Management ");
             }
         }
     }
 
     /**
      * Does the work of checking the DependencyManagement Section.
      *
      * @return true if errors are found
      * @throws MojoExecutionException
      */
     private boolean checkDependencyManagement() throws MojoExecutionException {
         boolean foundError = false;
 
         getLog().info("Found Resolved Dependency/DependencyManagement mismatches:");
 
         List<Dependency> depMgtDependencies = null;
 
         DependencyManagement depMgt = project.getDependencyManagement();
         if (depMgt != null) {
             depMgtDependencies = depMgt.getDependencies();
         }
 
         if (depMgtDependencies != null && !depMgtDependencies.isEmpty()) {
             // put all the dependencies from depMgt into a map for quick lookup
             Map<String, Dependency> depMgtMap = new HashMap<>();
             Map<String, Exclusion> exclusions = new HashMap<>();
             for (Dependency depMgtDependency : depMgtDependencies) {
                 depMgtMap.put(depMgtDependency.getManagementKey(), depMgtDependency);
 
                 // now put all the exclusions into a map for quick lookup
                 exclusions.putAll(addExclusions(depMgtDependency.getExclusions()));
             }
 
             // get dependencies for the project (including transitive)
             Set<Artifact> allDependencyArtifacts = new LinkedHashSet<>(project.getArtifacts());
 
             // don't warn if a dependency that is directly listed overrides
             // depMgt. That's ok.
             if (this.ignoreDirect) {
                 getLog().info("\tIgnoring Direct Dependencies.");
                 Set<Artifact> directDependencies = project.getDependencyArtifacts();
                 allDependencyArtifacts.removeAll(directDependencies);
             }
 
             // log exclusion errors
             List<Artifact> exclusionErrors = getExclusionErrors(exclusions, allDependencyArtifacts);
             for (Artifact exclusion : exclusionErrors) {
                 getLog().info(getArtifactManagementKey(exclusion)
                         + " was excluded in DepMgt, but version " + exclusion.getVersion()
                         + " has been found in the dependency tree.");
                 foundError = true;
             }
 
             // find and log version mismatches
             Map<Artifact, Dependency> mismatch = getMismatch(depMgtMap, allDependencyArtifacts);
             for (Map.Entry<Artifact, Dependency> entry : mismatch.entrySet()) {
                 logMismatch(entry.getKey(), entry.getValue());
                 foundError = true;
             }
             if (!foundError) {
                 getLog().info("\tNone");
             }
         } else {
             getLog().info("\tNothing in DepMgt.");
         }
 
         return foundError;
     }
 
     /**
      * Returns a map of the exclusions using the Dependency ManagementKey as the keyset.
      *
      * @param exclusionList to be added to the map
      * @return a map of the exclusions using the Dependency ManagementKey as the keyset
      */
     public Map<String, Exclusion> addExclusions(List<Exclusion> exclusionList) {
         if (exclusionList != null) {
             return exclusionList.stream().collect(Collectors.toMap(this::getExclusionKey, exclusion -> exclusion));
         }
         return Collections.emptyMap();
     }
 
     /**
      * Returns a List of the artifacts that should have been excluded, but were found in the dependency tree.
      *
      * @param exclusions a map of the DependencyManagement exclusions, with the ManagementKey as the key and Dependency
      *            as the value
      * @param allDependencyArtifacts resolved artifacts to be compared
      * @return list of artifacts that should have been excluded
      */
     public List<Artifact> getExclusionErrors(Map<String, Exclusion> exclusions, Set<Artifact> allDependencyArtifacts) {
         return allDependencyArtifacts.stream()
                 .filter(artifact -> exclusions.containsKey(getExclusionKey(artifact)))
                 .collect(Collectors.toList());
     }
 
     /**
      * @param artifact {@link Artifact}
      * @return the resulting GA
      */
     public String getExclusionKey(Artifact artifact) {
         return artifact.getGroupId() + ":" + artifact.getArtifactId();
     }
 
     /**
      * @param ex the exclusion key
      * @return the resulting combination of groupId+artifactId
      */
     public String getExclusionKey(Exclusion ex) {
         return ex.getGroupId() + ":" + ex.getArtifactId();
     }
 
     /**
      * Calculate the mismatches between the DependencyManagement and resolved artifacts.
      *
      * @param depMgtMap a keyset of the Dependency.GetManagementKey for quick lookup
      * @param allDependencyArtifacts the set of all artifacts to compare
      * @return a map containing the resolved artifact as the key and the listed dependency as the value
      */
     public Map<Artifact, Dependency> getMismatch(
             Map<String, Dependency> depMgtMap, Set<Artifact> allDependencyArtifacts) {
         Map<Artifact, Dependency> mismatchMap = new HashMap<>();
 
         for (Artifact dependencyArtifact : allDependencyArtifacts) {
             Dependency depFromDepMgt = depMgtMap.get(getArtifactManagementKey(dependencyArtifact));
             if (depFromDepMgt != null) {
                 if (depFromDepMgt.getVersion() != null
                         && !depFromDepMgt.getVersion().equals(dependencyArtifact.getBaseVersion())) {
                     mismatchMap.put(dependencyArtifact, depFromDepMgt);
                 }
             }
         }
         return mismatchMap;
     }
 
     /**
      * This function displays the log to the screen showing the versions and information about the artifacts that don't
      * match.
      *
      * @param dependencyArtifact the artifact that was resolved
      * @param dependencyFromDepMgt the dependency listed in the DependencyManagement section
      * @throws MojoExecutionException in case of errors
      */
     public void logMismatch(Artifact dependencyArtifact, Dependency dependencyFromDepMgt)
             throws MojoExecutionException {
         if (dependencyArtifact == null || dependencyFromDepMgt == null) {
             throw new MojoExecutionException(
                     "Invalid params: Artifact: " + dependencyArtifact + " Dependency: " + dependencyFromDepMgt);
         }
 
         getLog().info("\tDependency: " + dependencyFromDepMgt.getManagementKey());
         getLog().info("\t\tDepMgt  : " + dependencyFromDepMgt.getVersion());
         getLog().info("\t\tResolved: " + dependencyArtifact.getBaseVersion());
     }
 
     /**
      * This function returns a string comparable with Dependency.GetManagementKey.
      *
      * @param artifact to gen the key for
      * @return a string in the form: groupId:ArtifactId:Type[:Classifier]
      */
     public String getArtifactManagementKey(Artifact artifact) {
         return artifact.getGroupId() + ":" + artifact.getArtifactId() + ":" + artifact.getType()
                 + ((artifact.getClassifier() != null) ? ":" + artifact.getClassifier() : "");
     }
 
     /**
      * @return the failBuild
      */
     protected final boolean isFailBuild() {
         return this.failBuild;
     }
 
     /**
      * @param theFailBuild the failBuild to set
      */
     public void setFailBuild(boolean theFailBuild) {
         this.failBuild = theFailBuild;
     }
 
     /**
      * @return the project
      */
     protected final MavenProject getProject() {
         return this.project;
     }
 
     /**
      * @return the ignoreDirect
      */
     protected final boolean isIgnoreDirect() {
         return this.ignoreDirect;
     }
 
     /**
      * @param theIgnoreDirect the ignoreDirect to set
      */
     public void setIgnoreDirect(boolean theIgnoreDirect) {
         this.ignoreDirect = theIgnoreDirect;
     }
 }