/*
    * The MIT License (MIT)
    *
    * Copyright (c) 2013-2026 The Coveralls Maven Plugin Project Contributors:
    *     https://github.com/hazendaz/coveralls-maven-plugin/graphs/contributors
    *
    * Permission is hereby granted, free of charge, to any person obtaining a copy
    * of this software and associated documentation files (the "Software"), to deal
    * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  package org.eluder.coveralls.maven.plugin.source;
  
  import java.io.BufferedInputStream;
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.charset.Charset;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.util.HashMap;
  import java.util.Map;
  
  import org.apache.commons.io.FilenameUtils;
  import org.codehaus.plexus.util.DirectoryScanner;
  import org.codehaus.plexus.util.SelectorUtils;
  
  /**
   * The Class ScanSourceLoader.
   */
  public class ScanSourceLoader extends AbstractSourceLoader {
  
      /** The cache. */
      private final Map<String, String[]> cache = new HashMap<>();
  
      /** The source directory. */
      private final File sourceDirectory;
  
      /**
       * Instantiates a new scan source loader.
       *
       * @param base
       *            the base
       * @param sourceDirectory
       *            the source directory
       * @param sourceEncoding
       *            the source encoding
       */
      public ScanSourceLoader(final File base, final File sourceDirectory, final Charset sourceEncoding) {
          super(base.toURI(), sourceDirectory.toURI(), sourceEncoding);
          this.sourceDirectory = sourceDirectory;
      }
  
      @Override
      protected InputStream locate(final String sourceFile) throws IOException {
          final var path = Path.of(this.sourceDirectory.toString(), this.getFileName(sourceFile));
  
          if (Files.exists(path)) {
              if (!Files.isRegularFile(path)) {
                  throw new IllegalArgumentException(path.toAbsolutePath() + " is not file");
              }
              return new BufferedInputStream(Files.newInputStream(path));
          }
          return null;
      }
  
      /**
       * Scan for.
       *
       * @param extension
       *            the extension
       *
       * @return the string[]
       */
      private String[] scanFor(final String extension) {
          return this.cache.computeIfAbsent(extension, ext -> {
              final var scanner = new DirectoryScanner();
              scanner.setBasedir(this.sourceDirectory);
              scanner.addDefaultExcludes();
              scanner.setIncludes(new String[] { "**/*." + ext });
              scanner.scan();
              return scanner.getIncludedFiles();
          });
      }
  
      @Override
     protected String getFileName(final String sourceFile) {
         final var extension = FilenameUtils.getExtension(sourceFile);
         final var matchingExtensionFiles = this.scanFor(extension);
 
         for (final String matchingExtensionFile : matchingExtensionFiles) {
             if (SelectorUtils.matchPath("**/" + sourceFile, matchingExtensionFile, true)) {
                 return matchingExtensionFile;
             }
         }
 
         return sourceFile;
     }
 
 }