package com.example.springboot.component;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;

import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.stereotype.Component;

import cn.hutool.json.JSONObject;
import cn.hutool.json.JSONUtil;

@ServerEndpoint(value = "/api/talk/{username}")
@Component
public class WebSocketServer {

    // @Autowired
    // HomeMapper homeMapper;

    static ConfigurableApplicationContext applicationContext;
 
    //解决无法注入mapper问题  //使用方法 homeMapper=WebSocketServer.applicationContext.getBean(HomeMapper.class);
    public static void setApplicationContext(ConfigurableApplicationContext configurableApplicationContext) {
        WebSocketServer.applicationContext = configurableApplicationContext;
    }


   private static final Logger log = LoggerFactory.getLogger(WebSocketServer.class);
    private List<String> messages;
    /**
     * 记录当前在线连接数
     */
    public static final Map<String, WebSocketServer> sessionMap = new ConcurrentHashMap<>();
    
    String username;
    Session session;
    public WebSocketServer() {
        this.messages = new ArrayList<>();
    }
    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session, @PathParam("username") String username) {
        this.username=username;
        this.session=session;
        sessionMap.put(username, this);
        log.info("有新用户加入，username={}, 当前在线人数为：{}", username, sessionMap.size());
       
        // JSONObject result = new JSONObject();
        // JSONArray array = new JSONArray();
        // result.set("users", array);
        // for (Object key : sessionMap.keySet()) {
        //     JSONObject jsonObject = new JSONObject();
        //     jsonObject.set("username", key); 
        //     array.add(jsonObject);
        // }
   
        //sendAllMessage(JSONUtil.toJsonStr(result));  // 后台发送消息给所有的客户端
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose(Session session, @PathParam("username") String username) {
        sessionMap.remove(username);
        log.info("有一连接关闭，移除username={}的用户session, 当前在线人数为：{}", username, sessionMap.size());
    }

    /**
     * 收到客户端消息后调用的方法
     * 后台收到客户端发送过来的消息
     * onMessage 是一个消息的中转站
     * 接受 浏览器端 socket.send 发送过来的 json数据
     * @param message 客户端发送过来的消息
     */
    @OnMessage
    public void onMessage(String message, Session session, @PathParam("username") String username) {
        log.info("服务端收到用户username={}的消息:{}", username, message);
        JSONObject obj = JSONUtil.parseObj(message);
         String text = obj.getStr("data"); 

         JSONObject jsonObject = new JSONObject();
         jsonObject.set("message", text);
        this.messages.add(text);
         this.sendMessage(jsonObject.toString()); //JSONUtil.toJsonStr(jsonObject)
         
    }

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

    /**
     * 服务端发送消息给客户端
     */
    public void sendMessage(String message) {
        try {
            log.info("服务端给客户端[{}]发送消息{}", this.session.getId(), message);
            this.session.getBasicRemote().sendText(message);
        } catch (Exception e) {
            log.error("服务端发送消息给客户端失败", e);
        }
    }

    /**
     * 服务端发送消息给所有客户端
     */
    public void sendAllMessage(String message) {
        try {
            for (WebSocketServer webSocketServer : sessionMap.values()) {
                log.info("服务端给客户端[{}]发送消息{}", this.session.getId(), message);
                webSocketServer.sendMessage(message);
            }
        } catch (Exception e) {
            log.error("服务端发送消息给客户端失败", e);
        }
    }

    public List<String> getMessages() {
        return messages;
        
    }

    public void clearMessages() {
        messages.clear();
    }
}