/*
    * 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.rat.configuration;
  
  import java.io.File;
  import java.lang.reflect.Constructor;
  import java.lang.reflect.InvocationTargetException;
  import java.net.URI;
  import java.util.Arrays;
  
  import org.apache.rat.ConfigurationException;
  
  /**
   * An enumeration of the types of files that can contain the configuration
   * information.
   */
  public enum Format {
      /** An XML file */
      XML(XMLConfigurationReader.class, "xml"),
      /** A plain text file */
      TXT(null, "txt", "text");
  
      /** The list of file suffixes that this format applies to */
      private final String[] suffix;
  
      /** The constructor for the MatcherReader for this Format */
      private Constructor<MatcherReader> matcherReader;
      /** The constructor for the LicenseReader for this Format */
      private Constructor<LicenseReader> licenseReader;
  
      @SuppressWarnings("unchecked")
      Format(final Class<?> reader, final String... suffix) {
          if (reader != null) {
              try {
                  matcherReader = MatcherReader.class.isAssignableFrom(reader)
                          ? (Constructor<MatcherReader>) reader.getConstructor()
                          : null;
                  licenseReader = LicenseReader.class.isAssignableFrom(reader)
                          ? (Constructor<LicenseReader>) reader.getConstructor()
                          : null;
              } catch (NoSuchMethodException | SecurityException e) {
                  throw new ConfigurationException("Error retrieving no argument constructor for " + reader.getName(), e);
              }
          }
          this.suffix = suffix;
      }
  
      /**
       * @return a new instance of MatcherReader for this format.
       */
      public MatcherReader matcherReader() {
          try {
              return matcherReader == null ? null : matcherReader.newInstance();
          } catch (InstantiationException | IllegalAccessException | IllegalArgumentException
                  | InvocationTargetException e) {
              throw new ConfigurationException("Can not instantiate MatcherReader for " + this.name(), e);
          }
      }
  
      /**
       * @return a new instance of the LicenseReader for this format.
       */
      public LicenseReader licenseReader() {
          try {
              return licenseReader == null ? null : licenseReader.newInstance();
          } catch (InstantiationException | IllegalAccessException | IllegalArgumentException
                  | InvocationTargetException e) {
              throw new ConfigurationException("Can not instantiate LicenseReader for " + this.name(), e);
          }
      }
  
      /**
       * Determine the {@code Format} from the file name.
       * @param name the file name to check.
       * @return the Format
       */
      public static Format from(final String name) {
          int pos = name.lastIndexOf('.');
          String suffix = name.substring(pos + 1);
          for (Format f : Format.values()) {
              if (Arrays.asList(f.suffix).contains(suffix)) {
                  return f;
              }
         }
         throw new IllegalArgumentException(String.format("No such suffix: %s", suffix));
     }
 
    /**
     * Determine the {@code Format} from a URI.
     * @param uri the URI to check.
     * @return the Format
     */
    public static Format from(final URI uri) {
         return Format.from(uri.toString());
     }
 
    /**
     * Determine the {@code Format} from a file.
     * @param file the File to check.
     * @return the Format
     */
    public static Format from(final File file) {
         return Format.from(file.getName());
     }
 }