/*
    * 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.commons.imaging.internal;
  
  import java.io.IOException;
  import java.util.function.Predicate;
  import java.util.function.Supplier;
  
  import org.apache.commons.imaging.AbstractImageParser;
  import org.apache.commons.imaging.ImageFormat;
  import org.apache.commons.imaging.ImageFormats;
  import org.apache.commons.imaging.Imaging;
  import org.apache.commons.imaging.ImagingParameters;
  import org.apache.commons.imaging.bytesource.ByteSource;
  
  /**
   * Internal utilities.
   *
   * @since 1.0-alpha3
   */
  public final class ImageParserFactory {
  
      public static <T extends ImagingParameters<T>> AbstractImageParser<T> getImageParser(final ByteSource byteSource) throws IOException {
          // TODO: circular dependency between Imaging and internal Util class below.
          final ImageFormat format = Imaging.guessFormat(byteSource);
          if (!format.equals(ImageFormats.UNKNOWN)) {
              return ImageParserFactory.getImageParser(format);
          }
  
          final String fileName = byteSource.getFileName();
          if (fileName != null) {
              return ImageParserFactory.getImageParser(fileName);
          }
  
          throw new IllegalArgumentException("Can't parse this format.");
      }
  
      public static <T extends ImagingParameters<T>> AbstractImageParser<T> getImageParser(final ImageFormat format) {
          return getImageParser(parser -> parser.canAcceptType(format), () -> new IllegalArgumentException("Unknown ImageFormat: " + format));
      }
  
      // This generics suppression is as good as the predicate given. If the predicate violates a generics design,
      // then there will be an error during runtime.
      @SuppressWarnings("unchecked")
      private static <T extends ImagingParameters<T>> AbstractImageParser<T> getImageParser(final Predicate<AbstractImageParser<?>> pred,
              final Supplier<? extends RuntimeException> supplier) {
          return (AbstractImageParser<T>) AbstractImageParser.getAllImageParsers().stream().filter(pred).findFirst().orElseThrow(supplier);
      }
  
      public static <T extends ImagingParameters<T>> AbstractImageParser<T> getImageParser(final String fileExtension) {
          return getImageParser(parser -> parser.canAcceptExtension(fileExtension), () -> new IllegalArgumentException("Unknown extension: " + fileExtension));
      }
  
      private ImageParserFactory() {
      }
  }