server_rate_limiter.h

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#ifndef SERVER_RATE_LIMITER_H
#define SERVER_RATE_LIMITER_H
 
#include <QDateTime>
#include <QMap>
#include <QString>

class ServerRateLimiter
{
public:
    static constexpr int MAX_RETRIES = 5;              
    static constexpr int MIN_429_BACKOFF_MS = 30000;   
    static constexpr int MAX_BACKOFF_MS = 60000;       
    static constexpr int EXHAUSTED_BACKOFF_MS = 60000; 
    static constexpr qint64 RESET_GRACE_MS = 300000;   

    [[nodiscard]] bool isRateLimited(const QString &host, const QDateTime &now) const;

    [[nodiscard]] int rounds(const QString &host) const;

    [[nodiscard]] QDateTime deadline(const QString &host) const;

    [[nodiscard]] QDateTime earliestDeadline(const QDateTime &now) const;

    QDateTime on429(const QString &host, const QDateTime &now, qint64 retryAfterMs = 0);

    void onSuccess(const QString &host);

    void clearExpired(const QDateTime &now);
 
private:
    QMap<QString, QDateTime> backoffUntil; 
    QMap<QString, int> retryRounds;        
    QMap<QString, QDateTime> last429;      
};
 
#endif // SERVER_RATE_LIMITER_H