// Copyright 2020 Google LLC
//
// 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
//
//     https://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 com.google.sps.servlets;

import com.google.appengine.api.datastore.DatastoreService;
import com.google.appengine.api.datastore.DatastoreServiceFactory;
import com.google.appengine.api.datastore.Entity;
import com.google.appengine.api.users.UserService;
import com.google.appengine.api.users.UserServiceFactory;
import com.google.sps.utils.UserCollector;
import com.google.sps.utils.UserConstants;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/api/remove-favourite")
public class RemoveFavouriteServlet extends AuthenticationServlet {
  @Override
  protected void get(HttpServletRequest request, HttpServletResponse response) throws IOException {
    // no get request
  }

  /** Removes a recipe from user's list of favourite recipes */
  @Override
  protected void post(HttpServletRequest request, HttpServletResponse response) throws IOException {
    Long recipeId = Long.parseLong(request.getReader().readLine());
    UserService userService = UserServiceFactory.getUserService();
    String userId = userService.getCurrentUser().getUserId();

    DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
    Entity userEntity = UserCollector.getUserEntity(userId, datastore);
    List<Long> favourites = (List<Long>) userEntity.getProperty(UserConstants.PROPERTY_FAVOURITES);
    if (favourites == null) {
      favourites = new ArrayList<>();
    }
    favourites.remove(recipeId);
    userEntity.setProperty(UserConstants.PROPERTY_FAVOURITES, favourites);
    datastore.put(userEntity);
  }
}

@@ -2149,21 +2149,26 @@
 );%0A    %7D
-%0A    
+ else if (
 favourit
@@ -2186,18 +2186,22 @@
 ecipeId)
-;%0A
+) %7B%0A  
     user
@@ -2271,16 +2271,18 @@
 s);%0A    
+  
 datastor
@@ -2300,14 +2300,20 @@
 ntity);%0A
+    %7D%0A
   %7D%0A%7D%0A

Update RemoveFavouriteServlet.java