content: /*
   * Solo - A small and beautiful blogging system written in Java.
   * Copyright (c) 2010-present, b3log.org
   *
   * Solo is licensed under Mulan PSL v2.
   * You can use this software according to the terms and conditions of the Mulan PSL v2.
   * You may obtain a copy of Mulan PSL v2 at:
   *         http://license.coscl.org.cn/MulanPSL2
   * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
   * See the Mulan PSL v2 for more details.
   */
  package org.b3log.solo.service;
  
  import org.apache.logging.log4j.Level;
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  import org.b3log.latke.ioc.Inject;
  import org.b3log.latke.model.Pagination;
  import org.b3log.latke.model.Plugin;
  import org.b3log.latke.plugin.AbstractPlugin;
  import org.b3log.latke.plugin.PluginManager;
  import org.b3log.latke.repository.RepositoryException;
  import org.b3log.latke.service.ServiceException;
  import org.b3log.latke.service.annotation.Service;
  import org.b3log.latke.util.Paginator;
  import org.b3log.solo.repository.PluginRepository;
  import org.json.JSONException;
  import org.json.JSONObject;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * Plugin query service.
   *
   * @author <a href="http://88250.b3log.org">Liang Ding</a>
   * @version 1.0.0.1, Jun 19, 2020
   * @since 0.4.0
   */
  @Service
  public class PluginQueryService {
  
      /**
       * Logger.
       */
      private static final Logger LOGGER = LogManager.getLogger(PluginQueryService.class);
  
      /**
       * Plugin repository.
       */
      @Inject
      private PluginRepository pluginRepository;
  
      /**
       * Plugin manager.
       */
      @Inject
      private PluginManager pluginManager;
  
      /**
       * Gets plugins by the specified request json object.
       *
       * @param requestJSONObject the specified request json object, for example,
       *                          "paginationCurrentPageNum": 1,
       *                          "paginationPageSize": 20,
       *                          "paginationWindowSize": 10,
       *                          see {@link Pagination} for more details
       * @return for example,
       * <pre>
       * {
       *     "pagination": {
       *         "paginationPageCount": 100,
       *         "paginationPageNums": [1, 2, 3, 4, 5]
       *     },
       *     "plugins": [{
       *         "name": "",
       *         "version": "",
       *         "author": "",
       *         "status": "", // Enumeration name of {@link org.b3log.latke.plugin.PluginStatus}
       *      }, ....]
       * }
       * </pre>
       * @throws ServiceException service exception
       * @see Pagination
       */
      public JSONObject getPlugins(final JSONObject requestJSONObject) throws ServiceException {
          final JSONObject ret = new JSONObject();
          try {
              final int currentPageNum = requestJSONObject.getInt(Pagination.PAGINATION_CURRENT_PAGE_NUM);
              final int pageSize = requestJSONObject.getInt(Pagination.PAGINATION_PAGE_SIZE);
              final int windowSize = requestJSONObject.getInt(Pagination.PAGINATION_WINDOW_SIZE);
              final List<JSONObject> pluginJSONObjects = new ArrayList<JSONObject>();
              final List<AbstractPlugin> plugins = pluginManager.getPlugins();
              for (final AbstractPlugin plugin : plugins) {
                  final JSONObject jsonObject = plugin.toJSONObject();
                  pluginJSONObjects.add(jsonObject);
              }
  
              final int pageCount = (int) Math.ceil((double) pluginJSONObjects.size() / (double) pageSize);
              final JSONObject pagination = new JSONObject();
              ret.put(Pagination.PAGINATION, pagination);
              final List<Integer> pageNums = Paginator.paginate(currentPageNum, pageSize, pageCount, windowSize);
              pagination.put(Pagination.PAGINATION_PAGE_COUNT, pageCount);
              pagination.put(Pagination.PAGINATION_PAGE_NUMS, pageNums);
  
              final int start = pageSize * (currentPageNum - 1);
              int end = start + pageSize;
              end = end > pluginJSONObjects.size() ? pluginJSONObjects.size() : end;
              ret.put(Plugin.PLUGINS, pluginJSONObjects.subList(start, end));
              return ret;
          } catch (final Exception e) {
              LOGGER.log(Level.ERROR, "Gets plugins failed", e);
              throw new ServiceException(e);
          }
      }
  
      /**
       * get the setting(json formatter) of the plugin by the specified pluginoId.
       *
       * @param pluginId the specified pluginId
       * @return the {@link AbstractPlugin}
       * @throws ServiceException service exception
       * @throws JSONException    json exception
       */
      public String getPluginSetting(final String pluginId) throws ServiceException, JSONException {
          JSONObject ret;
          try {
              ret = pluginRepository.get(pluginId);
          } catch (final RepositoryException e) {
              LOGGER.log(Level.ERROR, "get plugin[" + pluginId + "] fail");
              throw new ServiceException("get plugin[" + pluginId + "] fail");
          }
          if (ret == null) {
              LOGGER.log(Level.ERROR, "can not find plugin[" + pluginId + "]");
              throw new ServiceException("can not find plugin[" + pluginId + "]");
          }
          return ret.optString(Plugin.PLUGIN_SETTING);
      }
  }
  