/*
    * 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.creadur.tentacles;
  
  import java.io.File;
  import java.io.FileFilter;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.regex.Pattern;
  
  import org.apache.creadur.tentacles.filter.Filters;
  
  public class FileSystem {
  
      private final Filters filters;
  
      public FileSystem() {
          this.filters = new Filters();
      }
  
      public List<File> legalDocumentsUndeclaredIn(final File contents) {
          return collect(contents,
                  this.filters.legalDocumentsUndeclaredIn(contents));
      }
  
      public List<File> legalDocumentsDeclaredIn(final File contents) {
          return collect(contents,
                  this.filters.legalDocumentsDeclaredIn(contents));
      }
  
      public List<File> collect(final File dir, final String regex) {
          return collect(dir, Pattern.compile(regex));
      }
  
      private List<File> collect(final File dir, final Pattern pattern) {
          return collect(dir, file -> pattern.matcher(file.getAbsolutePath()).matches());
      }
  
      public List<File> collect(final File dir, final FileFilter filter) {
          final List<File> accepted = new ArrayList<>();
          if (filter.accept(dir)) {
              accepted.add(dir);
          }
  
          final File[] files = dir.listFiles();
          if (files != null) {
              for (final File file : files) {
                  accepted.addAll(collect(file, filter));
              }
          }
  
          return accepted;
      }
  
      public void mkparent(final File file) {
          mkdirs(file.getParentFile());
      }
  
      public void mkdirs(final File file) {
  
          if (!file.exists()) {
  
              final boolean success = file.mkdirs();
              assert success : "mkdirs failed to create " + file;
  
              return;
          }
  
          final boolean isDirectory = file.isDirectory();
          assert isDirectory : "Not a directory: " + file;
      }
  
      public List<File> documentsFrom(final File repository) {
          return collect(repository, this.filters.filesOnly());
      }
  
      public List<File> licensesFrom(final File directory) {
          return collect(directory, this.filters.licensesOnly());
      }
  
      public List<File> noticesOnly(final File directory) {
          return collect(directory, this.filters.noticesOnly());
      }
  
      public List<File> licensesDeclaredIn(final File contents) {
         return collect(contents, this.filters.licensesDeclaredIn(contents));
     }
 
     public List<File> noticesDeclaredIn(final File contents) {
         return collect(contents, this.filters.noticesDeclaredIn(contents));
     }
 
     public List<File> archivesInPath(final File file,
             final String fileRepositoryPathNameFilter) {
         return collect(file, this.filters.archivesInPath(fileRepositoryPathNameFilter));
     }
 }