/**
    * 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.IOException;
  import java.util.Collections;
  import java.util.Map;
  
  public class Licenses {
  
      private final IOSystem ioSystem;
      private final Map<String, String> licenses;
  
      public Licenses(final Map<String, String> licenses, final Platform platform) {
          super();
          this.ioSystem = platform.getIoSystem();
          this.licenses = Collections.unmodifiableMap(licenses);
      }
  
      public License from(final File document) throws IOException {
          return license(this.ioSystem.slurp(document));
      }
  
      private License license(final String text) {
          final String key = toKey(text);
          return new License(key, normalize(text));
      }
  
      private String toKey(final String text) {
          return text.replaceAll("[ \\n\\t\\r]+", "").toLowerCase().intern();
      }
  
      private String normalize(String text) {
          for (final Map.Entry<String, String> license : this.licenses.entrySet()) {
              text =
                      text.replace(
                              license.getValue(),
                              String.format("---[%s - full text]---\n\n",
                                      license.getKey()));
          }
          text = text.intern();
          return text;
      }
  }