package com.miniframe.websocket;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.TextWebSocketHandler;


/**
 * 这个类处理来之浏览器（客户端）的WebSocket请求。在这个例子中，我们创建一个叫WebSocketEndPoint的类，并让它集成TextWebsocketHandler类。
 * 然后重写父类方法handlerTextMessage(),每当客户端发送信息过来，都会由这个函数接收并处理。
 * 当然这里还可以重写其他方法，如afterConnectionEstablished、afterConnectionClosed、handleTransportError
 * 等等
 * 
 * @author Administrator
 *
 */
@Service
public class WebsocketEndPoint extends TextWebSocketHandler {

	@Autowired
	private final static Map<String, WebSocketSession> userMap = new ConcurrentHashMap<String, WebSocketSession>();

	/**
	 * 关闭websocket时调用该方法
	 * 
	 * @see org.springframework.web.socket.WebSocketHandler#afterConnectionClosed(org.springframework.web.socket.WebSocketSession,
	 *      org.springframework.web.socket.CloseStatus)
	 */
	@Override
	public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
		String projectId = this.getProjectId(session);
		if (!StringUtils.isEmpty(projectId)) {
			userMap.remove(projectId);
			System.err.println("该" + projectId + "用户已成功关闭");
		} else {
			System.err.println("关闭时，获取用户id为空");
		}

	}

	/**
	 * 建立websocket连接时调用该方法
	 * 
	 * org.springframework.web.socket.WebSocketHandler#afterConnectionEstablished(org.springframework.web.socket.WebSocketSession)
	 */
	@Override
	public void afterConnectionEstablished(WebSocketSession session) throws Exception {
		String projectId = this.getProjectId(session);
		if (!StringUtils.isEmpty(projectId)) {
			userMap.put(projectId, session);
			session.sendMessage(new TextMessage("建立服务端连接成功！"));
		}

	}

	/**
	 * 客户端调用websocket.send时候，会调用该方法,进行数据通信
	 * 
	 * org.springframework.web.socket.WebSocketHandler#handleMessage(org.springframework.web.socket.WebSocketSession,
	 * org.springframework.web.socket.WebSocketMessage)
	 */
	@Override
	public void handleMessage(WebSocketSession session, WebSocketMessage<?> message) throws Exception {
		String msg = message.getPayload().toString();
		String projectId = this.getProjectId(session);
		WebSocketSession sessionk = userMap.get(projectId);
		if(sessionk == null || !session.isOpen()){
			userMap.put(projectId, session);
		}
		System.err.println("该" + projectId + "用户发送的消息是：" + msg);
		message = new TextMessage("服务端已经接收到消息，msg=" + msg);
		session.sendMessage(message);
	}

	/**
	 * 传输过程出现异常时，调用该方法
	 * 
	 * org.springframework.web.socket.WebSocketHandler#handleTransportError(org.springframework.web.socket.WebSocketSession,
	 * java.lang.Throwable)
	 */
	@Override
	public void handleTransportError(WebSocketSession session, Throwable e) throws Exception {
		WebSocketMessage<String> message = new TextMessage("异常信息：" + e.getMessage());
		session.sendMessage(message);
	}

	/**
	 * org.springframework.web.socket.WebSocketHandler#supportsPartialMessages()
	 */
	@Override
	public boolean supportsPartialMessages() {

		return false;
	}

	/**
	 * sendmessagetouser:发给指定用户
	 * 
	 */
	public void sendMessageToUser(String projectId, String contents) {
		WebSocketSession session = userMap.get(projectId);
		if (session != null && session.isOpen()) {
			try {
				TextMessage message = new TextMessage(contents);
				session.sendMessage(message);
				System.out.println("websocket发生 消息");
			} catch (IOException e) {
				//e.printStackTrace();
			}
		}
	}

	/**
	 * sendMessageToAllUsers:发给所有的用户
	 * 
	 */
	public void sendMessageToAllUsers(String contents) {
		Set<String> projectIds = userMap.keySet();
		for (String projectId : projectIds) {
			this.sendMessageToUser(projectId, contents);
		}
	}

	/**
	 * getvdioId:获取用户id
	 * 
	 * @author liuchao
	 * @param session
	 * @return
	 * @since JDK 1.7
	 */
	private String getProjectId(WebSocketSession session) {
		try {
			String projectId = (String) session.getAttributes().get("currentUser");
			return projectId;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
}