/*
 * Copyright 2014-2019 the original author or authors.
 *
 * 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 sample.websocket;

import java.security.Principal;
import java.util.Calendar;
import java.util.Collections;

import sample.data.ActiveWebSocketUser;
import sample.data.ActiveWebSocketUserRepository;

import org.springframework.context.ApplicationListener;
import org.springframework.messaging.MessageHeaders;
import org.springframework.messaging.simp.SimpMessageHeaderAccessor;
import org.springframework.messaging.simp.SimpMessageSendingOperations;
import org.springframework.web.socket.messaging.SessionConnectEvent;

public class WebSocketConnectHandler<S> implements ApplicationListener<SessionConnectEvent> {

	private ActiveWebSocketUserRepository repository;

	private SimpMessageSendingOperations messagingTemplate;

	public WebSocketConnectHandler(SimpMessageSendingOperations messagingTemplate,
			ActiveWebSocketUserRepository repository) {
		super();
		this.messagingTemplate = messagingTemplate;
		this.repository = repository;
	}

	@Override
	public void onApplicationEvent(SessionConnectEvent event) {
		MessageHeaders headers = event.getMessage().getHeaders();
		Principal user = SimpMessageHeaderAccessor.getUser(headers);
		if (user == null) {
			return;
		}
		String id = SimpMessageHeaderAccessor.getSessionId(headers);
		this.repository.save(new ActiveWebSocketUser(id, user.getName(), Calendar.getInstance()));
		this.messagingTemplate.convertAndSend("/topic/friends/signin", Collections.singletonList(user.getName()));
	}

}
