/*
    * Copyright 2016 The Lannister Project
    * 
    * 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
    * 
    *     http://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 net.anyflow.lannister.httphandler.api;
  
  import com.hazelcast.core.IdGenerator;
  
  import net.anyflow.lannister.cluster.ClusterDataFactory;
  import net.anyflow.lannister.http.HttpRequestHandler;
  import net.anyflow.lannister.session.Session;
  
  @HttpRequestHandler.Handles(paths = { "api/clients" }, httpMethods = { "POST" })
  public class Clients extends HttpRequestHandler {
  	@SuppressWarnings("unused")
  	private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(Clients.class);
  
  	@Override
  	public String service() {
  		IdGenerator idgen = ClusterDataFactory.INSTANCE.createIdGenerator("CLIENT_ID_GENERATOR");
  
  		String clientId = null;
  		while (clientId == null) {
  			clientId = String.format("laniClientId%011d", idgen.newId());
  
  			if (Session.NEXUS.get(clientId) != null) {
  				clientId = null;
  			}
  		}
  
  		return String.format("{\"id\":\"%s\"}", clientId);
  	}
  }