package usecase.post;
   
   import common.http.ParameterConverter;
   import common.http.error.ForwardOnError;
   import common.http.interceptor.InterceptableServlet;
   import usecase.auth.AuthorizationConstraints;
   import usecase.section.SectionService;
   
   import javax.inject.Inject;
  import javax.servlet.ServletException;
  import javax.servlet.annotation.MultipartConfig;
  import javax.servlet.annotation.WebServlet;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  import javax.servlet.http.Part;
  import java.io.BufferedInputStream;
  import java.io.IOException;
  
  import static usecase.auth.AuthorizationConstraints.Types.REQUIRE_AUTHENTICATION;
  
  /**
   * Classe che permette di aggiungere un post.
   */
  @WebServlet("/newpost")
  @MultipartConfig
  @AuthorizationConstraints(REQUIRE_AUTHENTICATION)
  class NewPostServlet extends InterceptableServlet {
      @Inject private PostService service;
      @Inject private SectionService sectionService;
  
      private static final String NEW_POST_PAGE = "/WEB-INF/views/section/create-post.jsp";
  
      @Override
      protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
          request.getRequestDispatcher(NEW_POST_PAGE).forward(request, response);
      }
  
      @Override
      @ForwardOnError("/WEB-INF/views/section/create-post.jsp")
      protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
          ParameterConverter converter = new ParameterConverter(request);
          int sectionId = converter.getIntParameter("section").orElse(0);
          String sectionName = sectionService.showSection(sectionId).getName();
  
          String title = request.getParameter("title");
          String type = request.getParameter("type");
          String content = request.getParameter("content");
          Part picture = request.getPart("picture");
  
          int newPostId;
          if(type.equalsIgnoreCase("text")){
              newPostId = service.newPost(title,content,sectionName);
          }else{
              BufferedInputStream stream = picture.getSize() > 0 ? new BufferedInputStream(picture.getInputStream()) : null;
              newPostId = service.newPost(title,stream, sectionName);
          }
          response.sendRedirect(getServletContext().getContextPath() + "/post/" + newPostId);
      }
  }