/*
    * #%L
    * wcm.io
    * %%
    * Copyright (C) 2021 wcm.io
    * %%
    * Licensed 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.
   * #L%
   */
  package io.wcm.handler.mediasource.inline;
  
  import static io.wcm.handler.media.MediaNameConstants.URI_TEMPLATE_PLACEHOLDER_HEIGHT;
  import static io.wcm.handler.media.MediaNameConstants.URI_TEMPLATE_PLACEHOLDER_WIDTH;
  
  import org.apache.commons.lang3.StringUtils;
  import org.apache.sling.api.adapter.Adaptable;
  import org.apache.sling.api.resource.Resource;
  import org.jetbrains.annotations.NotNull;
  import org.jetbrains.annotations.Nullable;
  
  import io.wcm.handler.media.CropDimension;
  import io.wcm.handler.media.Dimension;
  import io.wcm.handler.media.MediaArgs;
  import io.wcm.handler.media.UriTemplate;
  import io.wcm.handler.media.UriTemplateType;
  import io.wcm.handler.media.impl.ImageFileServlet;
  import io.wcm.handler.media.impl.ImageFileServletSelector;
  import io.wcm.handler.media.impl.JcrBinary;
  import io.wcm.handler.media.impl.MediaFileServletConstants;
  import io.wcm.handler.url.UrlHandler;
  import io.wcm.sling.commons.adapter.AdaptTo;
  
  final class InlineUriTemplate implements UriTemplate {
  
    private final String uriTemplate;
    private final UriTemplateType type;
    private final Dimension dimension;
  
    @SuppressWarnings("java:S107") // allow more than 7 params
    InlineUriTemplate(@NotNull UriTemplateType type, @NotNull Dimension dimension,
        @NotNull Resource resource, @NotNull String fileName,
        @Nullable CropDimension cropDimension, @Nullable Integer rotation,
        @NotNull MediaArgs mediaArgs, @NotNull Adaptable adaptable) {
      this.uriTemplate = buildUriTemplate(type, resource, fileName, cropDimension, rotation, mediaArgs, adaptable);
      this.type = type;
      this.dimension = dimension;
    }
  
    @SuppressWarnings("java:S1075") // not a file path
    private static String buildUriTemplate(@NotNull UriTemplateType type, @NotNull Resource resource,
        @NotNull String fileName, @Nullable CropDimension cropDimension, @Nullable Integer rotation,
        @NotNull MediaArgs mediaArgs, @NotNull Adaptable adaptable) {
      String resourcePath = resource.getPath();
  
      // if parent resource is a nt:file resource, use this one as path for scaled image
      Resource parentResource = resource.getParent();
      if (parentResource != null && JcrBinary.isNtFile(parentResource)) {
        resourcePath = parentResource.getPath();
      }
  
      // URL to render scaled image via {@link InlineRenditionServlet}
      final long DUMMY_WIDTH = 999991;
      final long DUMMY_HEIGHT = 999992;
      String path = resourcePath
          + "." + ImageFileServletSelector.build(DUMMY_WIDTH, DUMMY_HEIGHT, cropDimension, rotation,
              mediaArgs.getImageQualityPercentage(), false)
          + "." + MediaFileServletConstants.EXTENSION
          // replace extension based on the format supported by ImageFileServlet for rendering for this rendition
          + "/" + ImageFileServlet.getImageFileName(fileName, mediaArgs.getEnforceOutputFileExtension());
  
      // build externalized URL
      UrlHandler urlHandler = AdaptTo.notNull(adaptable, UrlHandler.class);
      String url = urlHandler.get(path).urlMode(mediaArgs.getUrlMode()).buildExternalResourceUrl(resource);
  
      switch (type) {
        case CROP_CENTER:
          url = StringUtils.replace(url, Long.toString(DUMMY_WIDTH), URI_TEMPLATE_PLACEHOLDER_WIDTH);
          url = StringUtils.replace(url, Long.toString(DUMMY_HEIGHT), URI_TEMPLATE_PLACEHOLDER_HEIGHT);
          break;
        case SCALE_WIDTH:
          url = StringUtils.replace(url, Long.toString(DUMMY_WIDTH), URI_TEMPLATE_PLACEHOLDER_WIDTH);
          url = StringUtils.replace(url, Long.toString(DUMMY_HEIGHT), "0");
          break;
        case SCALE_HEIGHT:
          url = StringUtils.replace(url, Long.toString(DUMMY_WIDTH), "0");
          url = StringUtils.replace(url, Long.toString(DUMMY_HEIGHT), URI_TEMPLATE_PLACEHOLDER_HEIGHT);
          break;
        default:
          throw new IllegalArgumentException("Unsupported type: " + type);
     }
     return url;
   }
 
   @Override
   public @NotNull UriTemplateType getType() {
     return type;
   }
 
   @Override
   public @NotNull String getUriTemplate() {
     return uriTemplate;
   }
 
   @Override
   public long getMaxWidth() {
     return dimension.getWidth();
   }
 
   @Override
   public long getMaxHeight() {
     return dimension.getHeight();
   }
 
   @Override
   public String toString() {
     return uriTemplate;
   }
 
 }