package com.gk.hotwork.Config.WebSocket;

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicInteger;

@Component("websocket")
@ServerEndpoint("/push/{uid}")
@Slf4j
public class WebSocketServer {

    @PostConstruct
    public void init() {
        System.out.println("websocket 加载");
    }

    //静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
    private static final AtomicInteger onlineCount = new AtomicInteger(0);
    //concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
    private static Map<Long,WebSocketServer> webSocketMap = new ConcurrentHashMap<>();

    //与某个客户端的连接会话，需要通过它来给客户端发送数据
    private Session session;

    private Long uid;




    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session,@PathParam("uid") Long uid) {
        this.session = session;
        this.uid = uid;
        if(webSocketMap.containsKey(uid)){
            webSocketMap.remove(uid);
            webSocketMap.put(uid,this);
        }else{
            webSocketMap.put(uid,this);
            onlineCount.incrementAndGet();
        }
        log.info("有新窗口开始监听:当前在线人数为" + onlineCount);
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        if (webSocketMap.containsKey(uid)) {
            webSocketMap.remove(uid);
            onlineCount.decrementAndGet();
        }
        log.info("有一连接关闭！当前在线人数为" + onlineCount);
    }




    /**
     * 收到客户端消息后调用的方法
     * @param message 客户端发送过来的消息
     */
    @OnMessage
    public void onMessage(String message) throws IOException {
        log.info("来自客户端的消息：{}",message);
        sendMessage("收到消息，消息内容："+message);
    }

    @OnError
    public void onError(Session session, Throwable error) {
        log.error("发生错误：{}，Session ID： {}",error.getMessage(),session.getId());
    }

    public void sendMessage(String message) throws IOException {
        synchronized(session) {
            this.session.getBasicRemote().sendText(message);
        }
    }


    /**
     * @param uid
     * @param message
     */
    public static void sendMessage(@PathParam("uid") Long uid, String message) {
        try {
            if (webSocketMap.containsKey(uid))  webSocketMap.get(uid).sendMessage(message);
        } catch (IOException e) {
            log.error("发送消息出错：{}", e.getMessage());
            e.printStackTrace();
        }
    }

    /**
     * 群发消息
     * @param message
     * @throws IOException
     */
    public static void broadcast(String message) throws IOException {

    }


    public Session getSession() {
        return session;
    }

    public void setSession(Session session) {
        this.session = session;
    }
}