package cn.ezhizao.project.websocket;

import cn.ezhizao.project.business.message.domain.BizMessage;
import cn.ezhizao.project.business.message.service.IBizMessageService;
import com.alibaba.fastjson2.JSON;
import com.alibaba.fastjson2.JSONObject;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.Date;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;

//前端请求的路径

@ServerEndpoint(value = "/wsMessage/{userId}", encoders = {ServerEncoder.class})
@Component
public class WebSocketUser {
    private static final Logger log = LoggerFactory.getLogger(WebSocketUser.class);
    /**
     * 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 int onlineCount = 0;
    /**
     * concurrent包的线程安全，用来存放每个客户端对应的MyWebSocket对象。
     */
    public static ConcurrentHashMap<String, WebSocketUser> 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;
    /**
     * 接收userId
     */
    private String userId = "";
//    @Resource
//    IBizMessageService bizMessageService;

    private static IBizMessageService bizMessageService;

    @Resource
    public void setRealTimeMapper(IBizMessageService bizMessageService) {
        WebSocketUser.bizMessageService = bizMessageService;
    }
//
//    private static DataInformationServiceImpl dataInformationService;
//    @Resource
//    public void setDataInformationService(DataInformationServiceImpl dataInformationService) {
//        WebSocketUser.dataInformationService = dataInformationService;
//    }

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session, @PathParam("userId") String userId) {
        this.session = session;
        this.userId = userId;
        if (webSocketMap.containsKey(userId)) {
            webSocketMap.remove(userId);
            webSocketMap.put(userId, this);
            //加入set中
        } else {
            webSocketMap.put(userId, this);
            //加入set中
            addOnlineCount();
            //在线数加1
        }
        log.info("用户连接:" + userId + ",当前在线人数为:" + getOnlineCount());
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        if (webSocketMap.containsKey(userId)) {
            webSocketMap.remove(userId);
            //从set中删除
            subOnlineCount();
        }
        log.info("用户退出:" + userId + ",当前在线人数为:" + getOnlineCount());
    }

    /**
     * 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, Session session) {
        log.info("用户消息:" + userId + ",报文:" + message);
        //可以群发消息
        //消息保存到数据库、redis
        if (StringUtils.isNotBlank(message) && !message.equals("ping")) {
            try {
                //解析发送的报文
                JSONObject jsonObject = JSON.parseObject(message);
                //追加发送人(防止串改)
                jsonObject.put("fromUserId", this.userId);
                String toUserId = jsonObject.getString("toUserId");

                BizMessage userMessage = new BizMessage();
                userMessage.setFromUserId(Long.parseLong(this.userId));
                userMessage.setToUserId(Long.parseLong(toUserId));
                userMessage.setMessageDate(new Date());
                userMessage.setMessage(jsonObject.getString("message"));

                bizMessageService.save(userMessage);

                //传送给对应toUserId用户的websocket
                if (StringUtils.isNotBlank(toUserId) && webSocketMap.containsKey(toUserId)) {
                    webSocketMap.get(toUserId).sendMessage(jsonObject.toJSONString());
                } else {
                    log.error("请求的userId:" + toUserId + "不在该服务器上");
                    //否则不在这个服务器上，发送到mysql或者redis
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error("用户错误:" + this.userId + ",原因:" + error.getMessage());
        error.printStackTrace();
    }

    /**
     * 实现服务器主动推送
     */
    public void sendMessage(String message) throws IOException {
        log.info("服务器消息推送：" + message);
        this.session.getBasicRemote().sendText(message);
    }

    /**
     * 发送自定义消息
     */
    public static void sendInfo(String message, @PathParam("userId") String userId) throws IOException {
        log.info("发送消息到:" + userId + "，报文:" + message);
        if (StringUtils.isNotBlank(userId) && webSocketMap.containsKey(userId)) {
            webSocketMap.get(userId).sendMessage(message);
        } else {
            log.error("用户" + userId + ",不在线！");
//            webSocketMap.get(userId).sendMessage("用户" + userId + ",不在线！");
        }
    }

    public static void sendEmptyMessage(List<Long> userIds) {
        webSocketMap.forEach((key, value) -> {
            if (userIds.stream().noneMatch(v -> String.valueOf(v).equals(key))) {
                try {
                    value.sendMessage(0 + "");
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
        });
    }

    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        WebSocketUser.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        WebSocketUser.onlineCount--;
    }

} 
