/**
 * @file SSE流路由处理器
 * @author Yk <yk_9001@icloud.com>
 * @createdAt 2025-07-01
 * @lastModifiedAt 2025-07-01
 * @description 处理SSE连接
 */

const express = require('express');
const clients = require('../lib/clients');
const timeFormat = require('../utils/timeFormatter');

const router = express.Router();

router.post('/', (req, res) => {
    const { id, type, data, timestamp: ts, client_id } = req.body;

    if (!type || !data) {
        return res.status(400).json({ error: 'Missing required fields: type or data' });
    }

    const payload = {
        id: id || crypto.randomUUID(),
        type,
        data,
        timestamp: ts || Math.floor(Date.now() / 1000),
        client_id: client_id || null,
        server_time: timeFormat.formatTime()
    };

    if (client_id) {
        const clientRes = clients.get(client_id);
        if (!clientRes) {
            return res.status(404).json({ error: `Client ${client_id} not found` });
        }

        clientRes.write(`data: ${JSON.stringify(payload)}\n\n`);
        return res.json({ message: 'Message delivered', client_id });
    }

    const count = clients.broadcast(payload);
    return res.json({ message: 'Message broadcasted', delivered_to: count });
});

module.exports = router;