package com.github.mikkoi.maven.enforcer.rules;
   
   import javax.annotation.Nullable;
   import javax.inject.Inject;
   import javax.inject.Named;
   
   import org.apache.maven.enforcer.rule.api.AbstractEnforcerRule;
   import org.apache.maven.enforcer.rule.api.EnforcerRuleException;
   import org.apache.maven.execution.MavenSession;
  import org.apache.maven.model.Dependency;
  import org.apache.maven.project.MavenProject;
  
  import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  import java.util.Objects;
  import java.util.function.Predicate;
  
  /**
   * Maven Enforcer Custom Rule.
   */
  @Named("dependOnAllProjects")
  public class DependOnAllProjects extends AbstractEnforcerRule {
  
      /**
       * Constant value: Size of indentation inside a <dependency>> definition.
       */
      private static final String INDENT_DEPENDENCY = "    ";
      /**
       * Constant value: Maximum number of parts in a dependency declaration.
       */
      private static final int MAX_NUM_PARTS_IN_DEPENDENCY_DECLARATION = 3;
      /**
       * Constant value for faking boolean parameter false.
       */
      private static final String FALSE = "false";
      /**
       * Constant value for faking boolean parameter true.
       */
      private static final String TRUE = "true";
      /**
       * Inject needed Maven component.
        */
      private final MavenSession mavenSession;
      /**
       * Include by project [groupId:]artifactId[:packagingType].
       * Default value: all projects included.
       */
      private List<String> includes;
      /**
       * Exclude by project [groupId:]artifactId[:packagingType].
       * Default value: No projects excluded.
       * If includes list contains any items, they are evaluated first.
       * Then excludes are excluded from them.
       */
      private List<String> excludes;
      /**
       * Error if unknown project in includes/excludes.
       * If a wildcard (*) is used in the name, this parameter has no effect.
       */
      @SuppressWarnings("unused") // Not actually unused. Set via Plexus/Sisu Container.
      private String errorIfUnknownProject;
      /**
       * Include Maven root project.
       */
      @SuppressWarnings("unused") // Not actually unused. Set via Plexus/Sisu Container.
      private String includeRootProject;
  
      /**
       * Constructor.
       *
       * @param session            Initialized MavenSession object.
       */
      @Inject
      @SuppressFBWarnings
      public DependOnAllProjects(MavenSession session) {
          this.mavenSession = Objects.requireNonNull(session);
      }
  
      /**
       * Set includes.
       * @param includes the includes
       */
      @Inject
      public void setIncludes(@Nullable List<String> includes) {
          if (includes == null) {
              this.includes = new ArrayList<>();
          } else {
              this.includes = new ArrayList<>(includes);
          }
      }
  
      /**
       * Set excludes.
       * @param excludes the excludes
       */
      @Inject
      public void setExcludes(@Nullable List<String> excludes) {
         if (excludes == null) {
             this.excludes = new ArrayList<>();
         } else {
             this.excludes = new ArrayList<>(excludes);
         }
     }
 
     /**
      * Set errorIfUnknownProject.
      * @param errorIfUnknownProject the errorIfUnknownProject
      */
     @Inject
     public void setErrorIfUnknownProject(String errorIfUnknownProject) {
         if (errorIfUnknownProject != null) {
             this.errorIfUnknownProject = errorIfUnknownProject;
         } else {
             this.errorIfUnknownProject = FALSE;
         }
     }
 
     /**
      * Set includeRootProject.
      * @param includeRootProject the includeRootProject
      */
     @Inject
     public void setIncludeRootProject(String includeRootProject) {
         if (includeRootProject != null) {
             this.includeRootProject = includeRootProject;
         } else {
             this.includeRootProject = FALSE;
         }
     }
 
     /**
      * Format Dependency object to XML snippet.
      * User can simply copy-paste this to the project.
      * @param dependency Dependency object
      * @param indent     Indentation string, e.g. "    "
      * @return Formatted XML snippet
      */
     public static String formatDependency(Dependency dependency, String indent) {
         final String newLine = System.lineSeparator();
         final StringBuilder sb = new StringBuilder();
         sb.append("<dependency>").append(newLine);
         sb.append(indent).append(String.format("<groupId>%s</groupId>", dependency.getGroupId()))
             .append(newLine);
         sb.append(indent)
             .append(String.format("<artifactId>%s</artifactId>", dependency.getArtifactId()))
             .append(newLine);
         if (!"jar".equals(dependency.getType())) {
             sb.append(indent).append(String.format("<type>%s</type>", dependency.getType()))
                 .append(newLine);
         }
         sb.append("</dependency>");
         return sb.toString();
     }
 
     /**
      * Convert string for matching.
      *
      * @param s String
      * @return converted string
      */
     public static String convertStringForMatching(String s) {
         String t = s.replace(".", "\\.");
         t = t.replace("*", ".*");
         if (!t.contains(":")) {
             t = ".*:" + t + ":.*";
         }
         if (Arrays.stream(t.split(":")).count() < MAX_NUM_PARTS_IN_DEPENDENCY_DECLARATION) {
             t = t + ":.*";
         }
         return t;
     }
 
     /**
      * Compare two MavenProject objects.
      * GroupId, ArtifactId, Version and Packaging must match.
      *
      * @param a MavenProject a
      * @param b MavenProject b
      * @return true if projects are equal
      */
     public static boolean projectsAreEquals(MavenProject a, MavenProject b) {
         return a.getGroupId().equals(b.getGroupId())
             && a.getArtifactId().equals(b.getArtifactId()) && a.getVersion().equals(b.getVersion())
             && a.getPackaging().equals(b.getPackaging());
     }
 
     /**
      * Compare two Dependency objects.
      * GroupId, ArtifactId, Version and Type must match.
      *
      * @param a Dependency a
      * @param b Dependency b
      * @return true if dependencies are equal
      */
     public static boolean dependenciesAreEquals(Dependency a, Dependency b) {
         return a.getGroupId().equals(b.getGroupId())
             && a.getArtifactId().equals(b.getArtifactId()) && a.getVersion().equals(b.getVersion())
             && a.getType().equals(b.getType());
     }
 
     /**
      * Does the list (Iterable) of Dependency objects contain the MavenProject?
      *
      * @param projects Iterable of Dependency objects
      * @param project  a Maven project object
      * @return true if project is found
      */
     public static boolean dependenciesContains(Iterable<Dependency> projects,
                                                MavenProject project) {
         for (Dependency p : projects) {
             if (dependenciesAreEquals(p, projectToDependency(project))) {
                 return true;
             }
         }
         return false;
     }
 
     /**
      * Does any of the projects in Maven Reactor build match with this project name?
      * Name must not have a wildcard!
      *
      * @param projects    Iterable of MavenProject objects
      * @param projectName Project name, e.g. "artifactId", "groupId:artifactId", "groupId:artifactId:packingType".
      * @return Boolean
      */
     public static boolean projectsContains(Iterable<MavenProject> projects, String projectName) {
         List<String> ids = Arrays.asList(projectName.split(":"));
         for (MavenProject project : projects) {
             if (ids.size() == 1) {
                 if (project.getArtifactId().equals(ids.get(0))) {
                     return true;
                 }
             } else if (ids.size() == 2) {
                 if (project.getGroupId().equals(ids.get(0))
                     && project.getArtifactId().equals(ids.get(1))) {
                     return true;
                 }
             } else {
                 assert ids.size() == MAX_NUM_PARTS_IN_DEPENDENCY_DECLARATION;
                 if (project.getGroupId().equals(ids.get(0))
                     && project.getArtifactId().equals(ids.get(1))
                     && project.getPackaging().equals(ids.get(2))) {
                     return true;
                 }
             }
         }
         return false;
     }
 
     /**
      * Convert MavenProject to Dependency object.
      *
      * @param mavenProject MavenProject object
      * @return Dependency object
      */
     public static Dependency projectToDependency(MavenProject mavenProject) {
         Dependency d = new Dependency();
         d.setGroupId(mavenProject.getGroupId());
         d.setArtifactId(mavenProject.getArtifactId());
         d.setVersion(mavenProject.getVersion());
         d.setType(mavenProject.getPackaging());
         return d;
     }
 
     /**
      * Match projects with includes and excludes.
      * Includes are * by default. Then excludes are excluded from the includes.
      *
      * @param includes     Included projects. Default: *
      * @param excludes     Excluded projects. Default: none
      * @param mavenProject Initialized MavenProject object.
      * @return True or false.
      */
     public static boolean isProjectIncluded(List<String> includes, List<String> excludes,
                                             MavenProject mavenProject) {
         String projectId =
             String.format("%s:%s:%s", mavenProject.getGroupId(), mavenProject.getArtifactId(),
                 mavenProject.getPackaging());
 
         // Match from the end of the id, artifactId alone is enough.
         Predicate<String> predicateForProjectId =
             s -> projectId.matches(convertStringForMatching(s));
         return includes.stream().anyMatch(predicateForProjectId)
             && excludes.stream().noneMatch(predicateForProjectId);
     }
 
     /**
      * Validate parameters provided via properties
      * either on the command line or using configuration element in pom.
      *
      * @throws EnforcerRuleException if parameter validation fails.
      */
     void validateAndPrepareParameters() throws EnforcerRuleException {
         getLog().debug("includes=" + includes);
         getLog().debug("excludes=" + excludes);
         getLog().debug("errorIfUnknownProject=" + errorIfUnknownProject);
         getLog().debug("includeRootProject=" + includeRootProject);
 
         final List<MavenProject> reactorProjects =
             mavenSession.getProjectDependencyGraph().getSortedProjects();
         getLog().debug("reactorProjects=" + reactorProjects);
 
         /* There is a bug in Maven/Sisu/Plexus container, which sets includes to a list with one empty string,
          * if the parameter is not set. So we need to check for this case and convert it to an empty list.
          * Then we can add the default value of "*".
          */
         if ((includes == null) || (includes.size() == 1 && "".equals(includes.get(0)))) {
             includes = new ArrayList<>();
         }
         if (excludes == null) {
             excludes = new ArrayList<>();
         } else if (excludes.size() == 1 && "".equals(excludes.get(0))) {
             excludes = new ArrayList<>();
         }
         getLog().debug(String.format("Parameter includes.size: %d", includes.size()));
         for (String a : includes) {
             getLog().debug(String.format("Check include '%s'", a));
             if (a == null) {
                 throw new EnforcerRuleException(
                     "Failure in parameter 'includes'. String is null");
             }
             if (a.matches("^[\t\n ]+$")) {
                 throw new EnforcerRuleException(
                     String.format("Failure in parameter 'includes'. String contains only whitespace: '%s'", a));
             }
             List<String> ids = Arrays.asList(a.split(":"));
             if (ids.size() > MAX_NUM_PARTS_IN_DEPENDENCY_DECLARATION) {
                 throw new EnforcerRuleException(
                     "Failure in parameter 'includes'. String is invalid");
             }
             /* If there is a wildcard, we cannot check if the project exists in the build.
              * So we skip the check in this case.
              */
             if (TRUE.equals(errorIfUnknownProject) && !a.contains("*")
                 && !projectsContains(reactorProjects, a)) {
                 throw new EnforcerRuleException(String.format(
                     "Failure in parameter 'includes'. Project '%s' not found in build", a));
             }
         }
         if (includes.isEmpty()) {
             includes.add("*");
         }
 
         getLog().debug(String.format("Parameter excludes.size: %d", excludes.size()));
         for (String a : excludes) {
             getLog().debug(String.format("Check exclude '%s'", a));
             if (a == null) {
                 throw new EnforcerRuleException(
                     "Failure in parameter 'excludes'. String is null");
             }
             if (a.matches("^[\t\n ]+$")) {
                 throw new EnforcerRuleException(
                     String.format("Failure in parameter 'excludes'. String contains only whitespace: '%s'", a));
             }
             List<String> ids = Arrays.asList(a.split(":"));
             if (ids.size() > MAX_NUM_PARTS_IN_DEPENDENCY_DECLARATION) {
                 throw new EnforcerRuleException(
                     "Failure in parameter 'excludes'. String is invalid");
             }
             /* If there is a wildcard, we cannot check if the project exists in the build.
              * So we skip the check in this case.
              */
             if (TRUE.equals(errorIfUnknownProject) && !a.contains("*")
                 && !projectsContains(reactorProjects, a)) {
                 throw new EnforcerRuleException(String.format(
                     "Failure in parameter 'excludes'. Project '%s' not found in build", a));
             }
         }
 
         if (errorIfUnknownProject == null || errorIfUnknownProject.isEmpty()) {
             errorIfUnknownProject = FALSE;
         }
         if (includeRootProject == null || includeRootProject.isEmpty()) {
             includeRootProject = FALSE;
         }
         if (!TRUE.equals(errorIfUnknownProject) && !FALSE.equals(errorIfUnknownProject)) {
             throw new EnforcerRuleException(
                 String.format("Failure in parameter 'errorIfUnknownProject'. Must be 'true' or 'false': '%s'", errorIfUnknownProject));
         }
         if (!TRUE.equals(includeRootProject) && !FALSE.equals(includeRootProject)) {
             throw new EnforcerRuleException(
                 String.format("Failure in parameter 'includeRootProject'. Must be 'true' or 'false': '%s'", includeRootProject));
         }
 
         getLog().debug("includes(resolved)=" + includes);
         getLog().debug("excludes(resolved)=" + excludes);
         getLog().debug("errorIfUnknownProject(resolved)=" + errorIfUnknownProject);
         getLog().debug("includeRootProject(resolved)=" + includeRootProject);
     }
 
     /**
      * The rule logic.
      * Collect all projects in the build and filter according to includes/excludes.
      * Match the list with the dependencies of the current project.
      * If the two lists do not match, Raise EnforcerRuleException
      *
      * @throws EnforcerRuleException if rule fails.
      */
     public void dependOnAllProjects() throws EnforcerRuleException {
         List<MavenProject> includedProjects = new ArrayList<>();
         MavenProject currentProject = mavenSession.getCurrentProject();
         getLog().debug(String.format("Current Project: %s:%s", currentProject.getGroupId(),
             currentProject.getArtifactId()));
 
         getLog().debug("Iterate through all projects in Maven Dependency Graph, i.e. the build.");
         mavenSession.getProjectDependencyGraph().getSortedProjects().forEach(project -> {
             String projectId =
                 String.format("%s:%s:%s", project.getGroupId(), project.getArtifactId(),
                     project.getVersion());
             getLog().debug("    " + projectId);
 
             if (isIncluded(project)) {
                 if (projectsAreEquals(project, currentProject) || (!TRUE.equals(this.includeRootProject)
                     && projectsAreEquals(project, mavenSession.getTopLevelProject()))) {
                     getLog().debug("Filter out project: "
                         + String.format("%s:%s", project.getGroupId(), project.getArtifactId()));
                 } else {
                     includedProjects.add(project);
                 }
             }
         });
         getLog().debug("includedProjects=%s" + includedProjects);
         List<MavenProject> missingProjects = new ArrayList<>();
         for (MavenProject project : includedProjects) {
             @SuppressWarnings("unchecked") List<Dependency> dependencies =
                 currentProject.getDependencies();
             if (!dependenciesContains(dependencies, project)) {
                 missingProjects.add(project);
             }
         }
         if (!missingProjects.isEmpty()) {
             List<String> errors = new ArrayList<>(missingProjects.size());
             for (MavenProject missingProject : missingProjects) {
                 errors.add(String.format("Project '%s:%s' is missing dependency '%s:%s:%s'.",
                     currentProject.getGroupId(), currentProject.getArtifactId(),
                     missingProject.getGroupId(), missingProject.getArtifactId(),
                     missingProject.getPackaging()));
             }
             StringBuilder sb = new StringBuilder();
             sb.append(String.format("Missing definitions from the project '%s:%s':",
                 currentProject.getGroupId(), currentProject.getArtifactId()));
             sb.append(System.lineSeparator());
             sb.append("<!--     Created by Maven Enforcer rule dependOnAllProjects     --->");
             sb.append(System.lineSeparator());
             for (MavenProject missingProject : missingProjects) {
                 sb.append(formatDependency(projectToDependency(missingProject), INDENT_DEPENDENCY));
                 sb.append(System.lineSeparator());
             }
             sb.append("<!--     / Created by Maven Enforcer rule dependOnAllProjects     --->");
             errors.add(sb.toString());
             throw new EnforcerRuleException(String.join("\n", errors));
         }
         getLog().debug("End of iterate");
     }
 
     /**
      * The main entry point for rule.
      *
      * @throws EnforcerRuleException if rule fails.
      */
     @Override
     public void execute() throws EnforcerRuleException {
         MavenProject currentProject = mavenSession.getCurrentProject();
         getLog().debug(String.format("Current Project: %s:%s", currentProject.getGroupId(),
             currentProject.getArtifactId()));
         MavenProject topLevelProject = mavenSession.getTopLevelProject();
         getLog().debug(String.format("Top Level Project: %s:%s", topLevelProject.getGroupId(),
             topLevelProject.getArtifactId()));
 
         validateAndPrepareParameters();
 
         dependOnAllProjects();
     }
 
     /**
      * String representation of the rule.
      * Output is used in verbose Maven logs, can help during investigate problems.
      *
      * @return rule description
      */
     @Override
     public String toString() {
         return String.format(
             "DependOnAllProjects[includes=%s;excludes=%s;includeRootProject=%s;errorIfUnknownProject=%s]",
             includes, excludes, includeRootProject, errorIfUnknownProject);
     }
 
     /**
      * Decide if the project is included or excluded.
      *
      * @param mavenProject MavenProject
      * @return true if included, false if excluded
      */
     boolean isIncluded(MavenProject mavenProject) {
         boolean r = isProjectIncluded(this.includes, this.excludes, mavenProject);
         getLog().debug(String.format("isIncluded(%s:%s:%s:%s): %b", mavenProject.getGroupId(),
             mavenProject.getArtifactId(), mavenProject.getVersion(), mavenProject.getPackaging(),
             r));
         return r;
     }
 
 }