/*
    * 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.formats.png;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Objects;
  
  import org.apache.commons.imaging.common.ImageMetadata;
  import org.apache.commons.imaging.formats.tiff.TiffImageMetadata;
  import org.apache.commons.imaging.internal.Debug;
  
  /**
   * @since 1.0-alpha6
   */
  public class PngImageMetadata implements ImageMetadata {
  
      private static final String NEWLINE = System.lineSeparator();
  
      private final ImageMetadata textualInformation;
      private final TiffImageMetadata exif;
  
      public PngImageMetadata(final ImageMetadata textualInformation) {
          this(textualInformation, null);
      }
  
      public PngImageMetadata(final ImageMetadata textualInformation, final TiffImageMetadata exif) {
          this.textualInformation = Objects.requireNonNull(textualInformation);
          this.exif = exif;
      }
  
      public void dump() {
          Debug.debug(this.toString());
      }
  
      public TiffImageMetadata getExif() {
          return exif;
      }
  
      @Override
      public List<? extends ImageMetadataItem> getItems() {
          if (exif == null) {
              return textualInformation.getItems();
          }
  
          final ArrayList<ImageMetadataItem> result = new ArrayList<>(textualInformation.getItems());
          result.addAll(exif.getItems());
          return result;
      }
  
      public ImageMetadata getTextualInformation() {
          return textualInformation;
      }
  
      @Override
      public String toString() {
          return toString(null);
      }
  
      @Override
      public String toString(String prefix) {
          if (prefix == null) {
              prefix = "";
          }
  
          final StringBuilder result = new StringBuilder();
  
          result.append(prefix);
          result.append("Textual information:");
          result.append(NEWLINE);
          result.append(textualInformation.toString("\t"));
  
          if (exif != null) {
              result.append(NEWLINE);
              result.append(prefix);
              result.append("Exif metadata:");
              result.append(NEWLINE);
              result.append(exif.toString("\t"));
          }
  
          return result.toString();
      }
  }