/*
    * SPDX-FileCopyrightText: Copyright (c) 2011-2025 Yegor Bugayenko
    * SPDX-License-Identifier: MIT
    */
   package com.qulice.pmd;
   
   import com.jcabi.log.Logger;
   import com.qulice.spi.Environment;
   import java.io.File;
  import java.nio.charset.Charset;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.LinkedList;
  import net.sourceforge.pmd.PMDConfiguration;
  import net.sourceforge.pmd.Report;
  import net.sourceforge.pmd.RuleContext;
  import net.sourceforge.pmd.RulePriority;
  import net.sourceforge.pmd.util.datasource.DataSource;
  
  /**
   * Validates source files via <code>PmdValidator</code>.
   *
   * @since 0.3
   */
  @SuppressWarnings("deprecation")
  final class SourceValidator {
      /**
       * Rule context.
       */
      private final RuleContext context;
  
      /**
       * Report listener.
       */
      private final PmdListener listener;
  
      /**
       * Report renderer (responsible for picking up additional
       * PMD-generated reports with processing errors).
       */
      private final PmdRenderer renderer;
  
      /**
       * Rules.
       */
      private final PMDConfiguration config;
  
      /**
       * Source files encoding.
       */
      private final Charset encoding;
  
      /**
       * Creates new instance of <code>SourceValidator</code>.
       * @param env Environment
       */
      SourceValidator(final Environment env) {
          this.context = new RuleContext();
          this.listener = new PmdListener(env);
          this.renderer = new PmdRenderer();
          this.config = new PMDConfiguration();
          this.encoding = env.encoding();
      }
  
      /**
       * Performs validation of the input source files.
       * @param sources Input source files.
       * @param path Base path.
       * @return Collection of violations.
       */
      @SuppressWarnings({"PMD.AvoidInstantiatingObjectsInLoops", "PMD.CloseResource"})
      public Collection<PmdError> validate(
          final Collection<DataSource> sources, final String path) {
          this.config.setRuleSets("com/qulice/pmd/ruleset.xml");
          this.config.setThreads(0);
          this.config.setMinimumPriority(RulePriority.LOW);
          this.config.setIgnoreIncrementalAnalysis(true);
          this.config.setShowSuppressedViolations(true);
          this.config.setSourceEncoding(this.encoding.name());
          final Report report = new Report();
          report.addListener(this.listener);
          this.context.setReport(report);
          for (final DataSource source : sources) {
              final String name = source.getNiceFileName(false, path);
              Logger.debug(this, "Processing file: %s", name);
              this.context.setSourceCodeFile(new File(name));
              this.validateOne(source);
          }
          this.renderer.exportTo(report);
          report.errors().forEachRemaining(this.listener::onProcessingError);
          report.configErrors().forEachRemaining(this.listener::onConfigError);
          Logger.debug(
              this,
              "got %d errors",
              this.listener.errors().size()
          );
          return this.listener.errors();
      }
  
     /**
      * Performs validation of one file.
      * @param source Input source file
      */
     private void validateOne(final DataSource source) {
         final net.sourceforge.pmd.RuleSetFactory factory =
             new net.sourceforge.pmd.RuleSetFactory(
                 new net.sourceforge.pmd.util.ResourceLoader(),
                 RulePriority.LOW,
                 false,
                 true
             );
         net.sourceforge.pmd.PMD.processFiles(
             this.config,
             factory,
             new LinkedList<>(Collections.singleton(source)),
             this.context,
             Collections.singletonList(this.renderer)
         );
     }
 }