# QuestionResource.java

    /*
     * Copyright (C) 2000 - 2024 Silverpeas
     *
     * This program is free software: you can redistribute it and/or modify
     * it under the terms of the GNU Affero General Public License as
     * published by the Free Software Foundation, either version 3 of the
     * License, or (at your option) any later version.
     *
     * As a special exception to the terms and conditions of version 3.0 of
     * the GPL, you may redistribute this Program in connection with Free/Libre
     * Open Source Software ("FLOSS") applications as described in Silverpeas's
     * FLOSS exception. You should have received a copy of the text describing
     * the FLOSS exception, and it is also available here:
     * "http://www.silverpeas.org/docs/core/legal/floss_exception.html"
     *
     * This program is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
     * GNU Affero General Public License for more details.
     *
     * You should have received a copy of the GNU Affero General Public License
     * along with this program. If not, see <https://www.gnu.org/licenses/>.
     */
    package org.silverpeas.components.questionreply.web;

    import org.silverpeas.components.questionreply.model.Question;
    import org.silverpeas.components.questionreply.service.QuestionManagerProvider;
    import org.silverpeas.core.admin.user.model.SilverpeasRole;
    import org.silverpeas.core.annotation.WebService;
    import org.silverpeas.core.web.rs.annotation.Authorized;

    import javax.ws.rs.GET;
    import javax.ws.rs.Path;
    import javax.ws.rs.PathParam;
    import javax.ws.rs.Produces;
    import javax.ws.rs.QueryParam;
    import javax.ws.rs.WebApplicationException;
    import javax.ws.rs.core.MediaType;
    import javax.ws.rs.core.Response.Status;
    import java.net.URI;
    import java.util.ArrayList;
    import java.util.Collections;
    import java.util.List;
    import java.util.Set;

    /**
     * A REST Web resource representing a given question.
     * It is a web service that provides an access to a question referenced by its URL.
     */
    @WebService
    @Path(QuestionReplyBaseWebService.PATH + "/{componentId}/questions")
    @Authorized
    public class QuestionResource extends QuestionReplyBaseWebService {

      @PathParam("componentId")
      protected String componentId;

      @Override
      public String getComponentId() {
        return this.componentId;
      }

      /**
       * Gets the JSON representation of the specified existing question.
       * If the question doesn't exist, a 404 HTTP code is returned.
       * If the user isn't authentified, a 401 HTTP code is returned.
       * If the user isn't authorized to access the question, a 403 is returned.
       * If a problem occurs when processing the request, a 503 HTTP code is returned.
       * @param onQuestionId the unique identifier of the question.
       * @return the response to the HTTP GET request with the JSON representation of the asked question.
       */
      @GET
      @Path("{questionId}")
      @Produces(MediaType.APPLICATION_JSON)
      public QuestionEntity getQuestion(@PathParam("questionId") String onQuestionId) {
        try {
          Question theQuestion = QuestionManagerProvider.getQuestionManager().getQuestion(Long.parseLong(
              onQuestionId));
          URI questionURI = getUri().getRequestUri();
          if (extractVisibleQuestions(Collections.singletonList(theQuestion)).isEmpty()) {
            throw new WebApplicationException(Status.FORBIDDEN);
          }
          return asWebEntity(theQuestion, identifiedBy(questionURI));
        } catch (Exception ex) {
          throw encapsulateException(ex);
        }
      }

      @GET
      @Produces(MediaType.APPLICATION_JSON)
      public QuestionEntity[] getQuestions(@QueryParam("ids") Set<String> ids) {
        try {
          List<Question> questions =
              QuestionManagerProvider.getQuestionManager().getQuestionsByIds(new ArrayList<>(ids));
          return asWebEntities(extractVisibleQuestions(questions));
        } catch (Exception ex) {
          throw encapsulateException(ex);
        }
      }

      @GET
      @Path("all")
      @Produces(MediaType.APPLICATION_JSON)
      public QuestionEntity[] getAllQuestions() {
        try {
          List<Question> questions = QuestionManagerProvider.getQuestionManager().getAllQuestions(
              componentId);
          return asWebEntities(extractVisibleQuestions(questions));
        } catch (Exception ex) {
          throw encapsulateException(ex);
        }
      }

      @GET
      @Path("category/{categoryId}")
      @Produces(MediaType.APPLICATION_JSON)
      public QuestionEntity[] getAllQuestionsByCategory(@PathParam("categoryId") String categoryId) {
        try {
          List<Question> questions = QuestionManagerProvider.getQuestionManager().
              getAllQuestionsByCategory(componentId, categoryId);
          return asWebEntities(extractVisibleQuestions(questions));
        } catch (Exception ex) {
          throw encapsulateException(ex);
        }
      }

      List<Question> extractVisibleQuestions(List<Question> questions) {
        SilverpeasRole profile = getUserProfile();
        List<Question> visibleQuestions;
        if (profile == SilverpeasRole.USER) {
          visibleQuestions = new ArrayList<Question>(questions.size());
          for (Question question : questions) {
            if (question.getPublicReplyNumber() > 0) {
              visibleQuestions.add(question);
            }
          }
        } else {
          visibleQuestions = questions;
        }
        return visibleQuestions;
      }

      protected URI identifiedBy(URI uri) {
        return uri;
      }

      /**
       * Converts the specified list of questions into their corresponding web entities.
       * @param questions the questions to convert.
       * @return an array with the corresponding question entities.
       */
      protected QuestionEntity[] asWebEntities(List<Question> questions) {
        QuestionEntity[] entities = new QuestionEntity[questions.size()];
        for (int i = 0; i < questions.size(); i++) {
          Question question = questions.get(i);
          URI questionURI = getUri().getRequestUriBuilder().path(question.getPK().getId()).
              build();
          entities[i] = asWebEntity(question, identifiedBy(questionURI));
        }
        return entities;
      }

      /**
       * Converts the question into its corresponding web entity.
       * @param question the question to convert.
       * @param questionURI the URI of the question.
       * @return the corresponding question entity.
       */
      protected QuestionEntity asWebEntity(final Question question, URI questionURI) {
        QuestionEntity entity = QuestionEntity.fromQuestion(question,
                getUserPreferences().getLanguage()).withURI(questionURI).withUser(getUser(),
                getUserProfile());
        AuthorEntity author = AuthorEntity.fromUser(question.readAuthor(getOrganisationController()));
        author.setAvatar(getHttpServletRequest().getContextPath() + author.getAvatar());
        entity.setCreator(author);
        return entity;
      }
    }