if (!messageCache[currentUser]) messageCache[currentUser] = [];
                messageCache[currentUser].push(payload);
                renderMessages(currentUser);
                adminInput.value = '';
                if (users[currentUser]) {
                    users[currentUser].lastMsg = text;
                    renderSidebar();
                }
            }

            function sendAdminImage(file) {
                if (!file  !currentUser  !isReady) return;
                var u = users[currentUser];
                if (!u) return;
                var reader = new FileReader();
                reader.onload = function(e) {
                    var topic = 'chat/' + u.agentId + '/' + currentUser;
                    var 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);
            }

            adminSendBtn.addEventListener('click', sendAdminMessage);
            adminInput.addEventListener('keydown', function(e) {
                if (e.key === 'Enter') {
                    e.preventDefault();
                    sendAdminMessage();
                }
            });
            adminFileBtn.addEventListener('click', function() { adminFileInput.click(); });
            adminFileInput.addEventListener('change', function() {
                if (this.files && this.files[0]) {
                    sendAdminImage(this.files[0]);
                }
                this.value = '';
            });

            connect();
        })();
    </script>
</body>
</html>

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