package org.example.websocket.server;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import lombok.NonNull;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;

import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.lang.reflect.Type;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * @ClassDescription: websocket服务端
 * @JdkVersion: 1.8
 * @Created: 2023/8/31 14:59
 */
@Slf4j
@Component
@ServerEndpoint("/websocket-server")
public class WsServer {

    private Session session;
    private static AtomicInteger onlineCount = new AtomicInteger(0);
    private static CopyOnWriteArraySet<WsServer> wsServers = new CopyOnWriteArraySet<>();
    @Autowired
    @Qualifier("threadPoolTaskExecutor")
    private ThreadPoolTaskExecutor threadPoolTaskExecutor;

    @OnOpen
    public void onOpen(Session session) {
        this.session = session;
        int count = onlineCount.incrementAndGet();
        wsServers.add(this);
        log.info("与客户端连接成功，当前连接的客户端数量为：{}", count);
    }

    @OnError
    public void onError(Session session, @NonNull Throwable throwable) {
        log.error("连接发生报错");
        throwable.printStackTrace();
    }

    @OnClose
    public void onClose() {
        int count = onlineCount.decrementAndGet();
        wsServers.remove(this);
        log.info("服务端断开连接，当前连接的客户端数量为：{}", count);
    }

    private Map<String, Lock> sessionLocks = new ConcurrentHashMap<>();

    private Lock getSessionLock(String sessionId) {
        sessionLocks.putIfAbsent(sessionId, new ReentrantLock());
        return sessionLocks.get(sessionId);
    }

    public void sendMessageToAll(String message) {
        Map<String, Object> map = jsonToMap(message);
        if (map.get("pid").equals("00000001")) {
            System.out.println(message);
        }
        try {
            List<Future<?>> futures = new ArrayList<>();
            wsServers.forEach(ws -> {
                Future<?> future = threadPoolTaskExecutor.submit(() -> {
                    Session session = ws.session;
                    if (session != null && session.isOpen()) {
                        Lock sessionLock = getSessionLock(session.getId());
                        sessionLock.lock();
                        try {
                            synchronized (session){
                                session.getBasicRemote().sendText(message);
                            }
                        } catch (Exception e) {
                            log.error("发送消息时出现异常: " + e.getMessage());
                        } finally {
                            sessionLock.unlock();
                        }
                    } else {
                        log.error("会话不存在或已关闭，无法发送消息");
                    }
                });
                futures.add(future);
            });

            //等待所有任务执行完成
            for (Future<?> future : futures) {
                try {
                    future.get();
                } catch (InterruptedException | ExecutionException e) {
                    log.error("发送消息时出现异常: " + e.getMessage());
                }
            }
        } catch (Exception e) {
            log.error("发送消息时出现异常: " + e.getMessage());
        }
    }


    public static Map<String, Object> jsonToMap(String json) {
        Gson gson = new Gson();
        Type type = new TypeToken<Map<String, Object>>() {
        }.getType();
        return gson.fromJson(json, type);
    }
}