package com.ard.work.websocket.utils;

import com.alibaba.fastjson2.JSON;
import com.alibaba.fastjson2.JSONObject;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.Executor;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * @ClassName WebSocketUtils
 * @Description: websocket工具类
 * @Author 刘苏义
 * @Date 2023/1/27 7:46
 * @Version 1.0
 */
@Slf4j
public final class PTZWebSocketUtils {

    public static final ConcurrentMap<String, WebSocketSession> ONLINE_USER_SESSIONS = new ConcurrentHashMap<>();

    /** 推送线程池,由 PTZWebSocketInitializer 在启动时注入;未注入时降级为同步执行 */
    private static volatile Executor pushExecutor;

    public static void setPushExecutor(Executor executor) {
        pushExecutor = executor;
    }

    public static void sendMessage(WebSocketSession session, String message) {
        if (session == null) {
            return;
        }
        final InetSocketAddress remoteAddress = session.getRemoteAddress();
        if (remoteAddress == null) {
            return;
        }
        synchronized (session) {
            try {
                session.sendMessage(new TextMessage(message));
            } catch (IOException e) {
                log.error("sendMessage IOException ", e);
            }
        }
    }

    public static void sendMessage(WebSocketSession session, Map message) {
        sendMessage(session, JSONObject.toJSONString(message));
    }

    public static void sendMessage(WebSocketSession session, List message) {
        sendMessage(session, JSON.toJSONString(message));
    }

    /**
     * 推送字符串消息到所有客户端
     */
    public static void sendMessageAll(String message) {
        broadcast(message);
    }

    /**
     * 推送Map消息到所有客户端
     */
    public static void sendMessageAll(Map message) {
        broadcast(JSONObject.toJSONString(message));
    }

    /**
     * 推送List消息到所有客户端
     */
    public static void sendMessageAll(List message) {
        broadcast(JSON.toJSONString(message));
    }

    /**
     * 一次序列化,并行分发到所有 session
     */
    private static void broadcast(String payload) {
        if (ONLINE_USER_SESSIONS.isEmpty()) return;
        Executor executor = pushExecutor;
        if (executor == null) {
            ONLINE_USER_SESSIONS.values().forEach(session -> sendMessage(session, payload));
            return;
        }
        ONLINE_USER_SESSIONS.values().forEach(session ->
                executor.execute(() -> sendMessage(session, payload)));
    }

    /**
     * 发送消息给 userId_ 前缀的人
     */
    public static void sendMessagePrefix(String targetId, String message) {
        String regex = "^" + Pattern.quote(targetId) + "_\\d+$";
        Pattern pattern = Pattern.compile(regex);
        ONLINE_USER_SESSIONS.entrySet().stream().filter(entry -> {
            Matcher matcher = pattern.matcher(entry.getKey());
            return matcher.matches();
        }).map(Map.Entry::getValue).forEach(session -> PTZWebSocketUtils.sendMessage(session, message));
    }
}