package org.example;

import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;

@javax.websocket.server.ServerEndpoint("/ws")
public class WsServer {
    private static final Set<javax.websocket.Session> sessions = new CopyOnWriteArraySet<>();

    @javax.websocket.OnOpen
    public void onOpen(javax.websocket.Session session) {
        sessions.add(session);
        System.out.println("WebSocket连接已建立: " + session.getId());
        // 推送扫码枪列表给前端
        String deviceListJson = org.example.Main.getDeviceListJson();
        try {
            System.out.println("发送消息到前端");
            session.getBasicRemote().sendText(deviceListJson);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @javax.websocket.OnMessage
    public void onMessage(String message, javax.websocket.Session session) throws IOException {
        System.out.println("收到消息: " + message);
        session.getBasicRemote().sendText("服务器已收到: " + message);
    }

    @javax.websocket.OnClose
    public void onClose(javax.websocket.Session session) {
        sessions.remove(session);
        System.out.println("WebSocket连接已关闭: " + session.getId());
    }

    public static void broadcast(String message) {
        for (javax.websocket.Session session : sessions) {
            if (session.isOpen()) {
                try {
                    session.getBasicRemote().sendText(message);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}