/*
    * Copyright 2012-2021 CodeLibs Project and the Others.
    *
    * 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.
   */
  package org.codelibs.fess.app.web.thumbnail;
  
  import java.io.BufferedInputStream;
  import java.io.File;
  import java.io.FileInputStream;
  import java.util.Map;
  
  import javax.annotation.Resource;
  import javax.servlet.http.HttpServletResponse;
  
  import org.codelibs.core.lang.StringUtil;
  import org.codelibs.fess.app.web.base.FessSearchAction;
  import org.codelibs.fess.util.DocumentUtil;
  import org.lastaflute.web.Execute;
  import org.lastaflute.web.response.ActionResponse;
  
  public class ThumbnailAction extends FessSearchAction {
  
      // ===================================================================================
      //                                                                           Attribute
      //
      @Resource
      protected HttpServletResponse response;
  
      // ===================================================================================
      //                                                                               Hook
      //                                                                              ======
  
      // ===================================================================================
      //                                                                      Search Execute
      //                                                                      ==============
      @Execute
      public ActionResponse index(final ThumbnailForm form) {
          validate(form, messages -> {}, () -> asHtml(virtualHost(path_Error_ErrorJsp)));
          if (isLoginRequired()) {
              return redirectToLogin();
          }
  
          final Map<String, Object> doc =
                  searchHelper.getDocumentByDocId(form.docId, queryHelper.getResponseFields(), getUserBean()).orElse(null);
          final String url = DocumentUtil.getValue(doc, fessConfig.getIndexFieldThumbnail(), String.class);
          if (StringUtil.isBlank(form.queryId) || StringUtil.isBlank(url) || !thumbnailSupport) {
              // 404
              throw responseManager.new404("Thumbnail for " + form.docId + " is not found.");
          }
  
          final File thumbnailFile = thumbnailManager.getThumbnailFile(doc);
          if (thumbnailFile == null) {
              if (fessConfig.isThumbnailEnabled()) {
                  thumbnailManager.offer(doc);
              }
              // 404
              throw responseManager.new404("Thumbnail for " + form.docId + " is under generating.");
          }
  
          return asStream(form.docId).contentType(getImageMimeType(thumbnailFile)).stream(out -> {
              try (BufferedInputStream in = new BufferedInputStream(new FileInputStream(thumbnailFile))) {
                  out.write(in);
              }
          });
      }
  
      protected String getImageMimeType(final File imageFile) {
          final String path = imageFile.getAbsolutePath();
          if (path.endsWith(".png")) {
              return "image/png";
          }
          if (path.endsWith(".gif")) {
              return "image/gif";
          }
          if (path.endsWith(".jpg") || path.endsWith(".jpeg")) {
              return "image/jpeg";
          } else {
              return "application/octet-stream";
          }
      }
  }