const payload = {
                sender: 'admin',
                senderId: 'admin',
                senderName: '客服',
                text: text,
                time: new Date().toLocaleString(),
                type: 'text',
                image: ''
            };
            client.publish(topic, JSON.stringify(payload), { qos: 0, retain: false });
            // 存到缓存
            if (!messageCache[currentUser]) messageCache[currentUser] = [];
            messageCache[currentUser].push(payload);
            renderMessages(currentUser);
            adminInput.value = '';
            // 更新侧边栏最后消息
            if (users[currentUser]) {
                users[currentUser].lastMsg = text;
                renderSidebar();
            }
        }

        function sendAdminImage(file) {
            if (!file  !currentUser  !isReady) return;
            const u = users[currentUser];
            if (!u) return;
            const reader = new FileReader();
            reader.onload = function(e) {
                const topic = 'chat/' + u.agentId + '/' + currentUser;
                const payload = {
                    sender: 'admin',
                    senderId: 'admin',
                    senderName: '客服',
                    text: '图片',
                    time: new Date().toLocaleString(),
                    type: 'image',
                    image: e.target.result
                };
                client.publish(topic, JSON.stringify(payload), { qos: 0, retain: false });
                if (!messageCache[currentUser]) messageCache[currentUser] = [];
                messageCache[currentUser].push(payload);
                renderMessages(currentUser);
                if (users[currentUser]) {
                    users[currentUser].lastMsg = '图片';
                    renderSidebar();
                }
            };
            reader.readAsDataURL(file);
        }

        // ===== 事件绑定 =====
        adminSendBtn.addEventListener('click', sendAdminMessage);
        adminInput.addEventListener('keydown', (e) => {
            if (e.key === 'Enter') {
                e.preventDefault();
                sendAdminMessage();
            }
        });

        adminFileBtn.addEventListener('click', () => adminFileInput.click());
        adminFileInput.addEventListener('change', function() {
            if (this.files && this.files[0]) {
                sendAdminImage(this.files[0]);
            }
            this.value = '';
        });

        // ===== 启动 =====
        connect();
    </script>
</body>
</html>

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