/*
    * Copyright (C) 2017-2019 Centre National d'Etudes Spatiales (CNES).
    *
    * This library is free software; you can redistribute it and/or
    * modify it under the terms of the GNU Lesser General Public
    * License as published by the Free Software Foundation; either
    * version 3.0 of the License, or (at your option) any later version.
    *
    * This library 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
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
   * MA 02110-1301  USA
   */
  package fr.cnes.doi.resource.admin;
  
  import java.util.List;
  
  import org.apache.logging.log4j.Level;
  import org.apache.logging.log4j.Logger;
  import org.restlet.data.Form;
  import org.restlet.data.Status;
  import org.restlet.resource.Delete;
  import org.restlet.resource.Get;
  import org.restlet.resource.Post;
  import org.restlet.resource.ResourceException;
  
  import fr.cnes.doi.application.AdminApplication;
  import fr.cnes.doi.db.AbstractUserRoleDBHelper;
  import fr.cnes.doi.db.model.DOIUser;
  import fr.cnes.doi.exception.DOIDbException;
  import fr.cnes.doi.plugin.PluginFactory;
  import fr.cnes.doi.resource.AbstractResource;
  import fr.cnes.doi.utils.spec.Requirement;
  import java.util.ArrayList;
  
  /**
   * Provide resources to get all users, bind or delete a user to/from a project.
   */
  public class ManageUsersResource extends AbstractResource {
  
      /**
       * Parameter for the user name {@value #USER_NAME_PARAMETER}. This parameter
       * is send to associate an user to a project.
       */
      public static final String USER_NAME_PARAMETER = "user";
  
      /**
       * Logger.
       */
      private volatile Logger LOG;
  
      /**
       * Suffix of the project.
       */
      private volatile String suffixProject;
  
      /**
       * User name.
       */
      private volatile String userName;
  
      /**
       * Set-up method that can be overridden in order to initialize the state of
       * the resource.
       *
       * @throws ResourceException - if a problem happens
       */
      @Override
      protected void doInit() throws ResourceException {
          super.doInit();
          final AdminApplication app = (AdminApplication) getApplication();
          LOG = app.getLog();
          LOG.traceEntry();
          setDescription("This resource handles association between users and projects");
          this.suffixProject = getAttribute("suffixProject");
          this.userName = getAttribute("userName");
          LOG.debug(this.suffixProject);
          LOG.debug(this.userName);
  
          LOG.traceExit();
      }
  
      //TODO requirement
      /**
       * Get users.
       *
       * @return users.
       */
      @Get
      public List<String> getUsers() {
          LOG.traceEntry();
          try {
              final int idProject = Integer.parseInt(suffixProject);
              final List<String> users = new ArrayList<>();
             final AbstractUserRoleDBHelper manageUsers = PluginFactory.getUserManagement();
             final List<DOIUser> doiUsers = manageUsers.getUsersFromRole(idProject);
             for (final DOIUser doiUser : doiUsers) {
                 users.add(doiUser.getUsername());
             }
             return LOG.traceExit(users);
         } catch (DOIDbException ex) {
             throw LOG.throwing(new ResourceException(Status.SERVER_ERROR_INTERNAL, ex.getMessage()));
         }
     }
 
     //TODO requirement 
     /**
      * Adds user to project
      *
      * @param mediaForm form
      */
     @Requirement(reqId = Requirement.DOI_SRV_140, reqName = Requirement.DOI_SRV_140_NAME)
     @Post
     public void addUserToProject(final Form mediaForm) {
         LOG.traceEntry("Parameters\n\tmediaForm : {}", mediaForm);
         checkInputs(mediaForm);
         final String user = mediaForm.getFirstValue(USER_NAME_PARAMETER);
         final int idProject = Integer.parseInt(suffixProject);
         final AbstractUserRoleDBHelper manageUsers = PluginFactory.getUserManagement();
         if (manageUsers.isUserExist(user)) {
             if (manageUsers.addUserToRole(user, idProject)) {
                 setStatus(Status.SUCCESS_NO_CONTENT);
             } else {
                 throw LOG.throwing(new ResourceException(
                         Status.SERVER_ERROR_INTERNAL, "Can't add user to project"));
             }
         } else {
             throw LOG.throwing(new ResourceException(
                     Status.CLIENT_ERROR_BAD_REQUEST, "User " + user + " not found"));
         }
         LOG.traceExit();
     }
 
     //TODO requirement
     /**
      * Delete the project
      *
      */
     @Requirement(reqId = Requirement.DOI_SRV_140, reqName = Requirement.DOI_SRV_140_NAME)
     @Delete
     public void deleteProject() {
         LOG.traceEntry();
         final int idProject = Integer.parseInt(suffixProject);
         final AbstractUserRoleDBHelper manageUsers = PluginFactory.getUserManagement();
         if (manageUsers.removeUserToRole(userName, idProject)) {
             setStatus(Status.SUCCESS_NO_CONTENT);
         } else {
             throw LOG.throwing(new ResourceException(Status.SERVER_ERROR_INTERNAL,
                     "Can't remove user " + userName));
         }
     }
 
     /**
      * Tests if the {@link #USER_NAME_PARAMETER} is set.
      *
      * @param mediaForm the parameters
      * @throws ResourceException - if USER_NAME_PARAMETER is not set
      */
     private void checkInputs(final Form mediaForm) throws ResourceException {
         LOG.traceEntry("Parameters\n\tmediaForm : {}", mediaForm);
         if (isValueNotExist(mediaForm, USER_NAME_PARAMETER)) {
             throw LOG.throwing(Level.DEBUG, new ResourceException(Status.CLIENT_ERROR_BAD_REQUEST,
                     USER_NAME_PARAMETER + " parameter must be set"));
         }
         LOG.debug("The form is valid");
         LOG.traceExit();
     }
 
 }