// WebSocket 管理模块
const jwt = require('jsonwebtoken');
const ADMINS = (process.env.ADMINS || '').split(',').map(s => s.trim()).filter(Boolean);
const JWT_SECRET = process.env.JWT_SECRET || 'xiaocai-secret-2024';

const clients = new Map();

function init(wss) {
  wss.on('connection', (ws, req) => {
    console.log('✅ WebSocket 客户端已连接');
    const url = new URL(req.url, 'http://localhost');
    const token = url.searchParams.get('token');
    if (!token) return ws.close();

    let username;
    try { const decoded = jwt.verify(token, JWT_SECRET); username = decoded.username; }
    catch (e) { return ws.close(); }

    ws.username = username;
    ws.isAdmin = ADMINS.includes(username);
    clients.set(ws, { username, roomId: null, isAdmin: ws.isAdmin });

    ws.on('message', (data) => {
      try {
        const msg = JSON.parse(data);
        if (msg.type === 'join') {
          ws.roomId = msg.roomId;
          clients.set(ws, { username, roomId: msg.roomId, isAdmin: ws.isAdmin });
        }
      } catch (e) {}
    });

    ws.on('close', () => clients.delete(ws));
  });
}

function broadcastToRoomExcludeSelf(roomId, excludeUsername, data) {
  const message = JSON.stringify(data);
  clients.forEach((info, ws) => {
    if (info.roomId === roomId && info.username !== excludeUsername && ws.readyState === 1) ws.send(message);
  });
}

function broadcastToRoom(roomId, data) {
  const message = JSON.stringify(data);
  clients.forEach((info, ws) => {
    if (info.roomId === roomId && ws.readyState === 1) ws.send(message);
  });
}

function broadcast(data) {
  const message = JSON.stringify(data);
  clients.forEach((info, ws) => { if (ws.readyState === 1) ws.send(message); });
}

module.exports = { init, broadcastToRoomExcludeSelf, broadcastToRoom, broadcast };