#pragma once

#include <QTcpServer>
#include <QTcpSocket>
#include <QMap>
#include <QByteArray>
#include <QString>

class ChatServer : public QTcpServer
{
    Q_OBJECT

public:
    explicit ChatServer(QObject *parent = nullptr);

protected:
    void incomingConnection(qintptr socketDescriptor) override;

private slots:
    void onReadyRead();
    void onDisconnected();

private:
    void processFrame(QTcpSocket *socket, const QByteArray &data);
    void broadcast(QTcpSocket *exclude, const QByteArray &frame);
    void sendSystemMessage(QTcpSocket *socket, const QString &text);
    void broadcastUserList();
    QByteArray buildFrame(const QString &type, const QString &from,
                          const QString &text, const QString &ts);

    // max bytes we buffer per client before dropping them (prevents memory abuse)
    static constexpr int MAX_BUFFER_SIZE = 1024 * 64;  // 64 KB

    QMap<QTcpSocket *, QString>    m_clients;  // socket → username
    QMap<QTcpSocket *, QByteArray> m_buffers;  // socket → incoming data buffer
};