Introduce computational state
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		@@ -27,9 +27,16 @@ class Calculator {
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                                            QDateTime const &start,
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                                            int netto_parking_time,
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                                            int paymentOptionIndex);
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    struct State {
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        bool m_timeLimitReached;
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        uint32_t m_costAtTimeLimit;
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    } m_state;
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protected:
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    explicit Calculator() = default;
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    explicit Calculator() {
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        m_state.m_timeLimitReached = false;
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        m_state.m_costAtTimeLimit = ~0;
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    }
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public:
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    Calculator(Calculator const &other) = delete;
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@@ -40,6 +47,12 @@ public:
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        return c;
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    }
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    bool timeLimitReached() const { return m_state.m_timeLimitReached; }
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    void setTimeLimitReached(bool timeLimitReached) { m_state.m_timeLimitReached = timeLimitReached; }
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    bool costAtTimeLimit() const { return m_state.m_costAtTimeLimit; }
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    void setCostAtTimeLimit(uint32_t cost) { if (m_state.m_costAtTimeLimit > cost) m_state.m_costAtTimeLimit = cost; }
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    void resetCostAtTimeLimit() { m_state.m_costAtTimeLimit = ~0; }
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    void ResetTimeSteps(int paymentOptionIndex) {
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        if (m_timeSteps.size() > 0 && paymentOptionIndex < m_timeSteps.size()) {
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            m_timeSteps[paymentOptionIndex].clear();
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@@ -87,8 +100,8 @@ public:
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    double GetCostFromDuration(Configuration* cfg, uint8_t vehicle_type, QDateTime &start_datetime, QDateTime & end_datetime, int durationMin,
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                               PermitType permitType, bool nextDay = false, bool prepaid = false);
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    std::pair<CalcState, QDateTime> ComputeDurationFromCost(Configuration const* cfg, QDateTime const &startDatetimePassed,  int cost);
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    std::pair<CalcState, std::optional<int>> ComputeCostFromDuration(Configuration const* cfg, QDateTime const &startDatetime, QDateTime &endDatetime, int nettoParkingTime);
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    std::pair<CalcState, QDateTime> ComputeDurationFromCost(Configuration *cfg, QDateTime const &startDatetimePassed,  int cost);
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    std::pair<CalcState, std::optional<int>> ComputeCostFromDuration(Configuration *cfg, QDateTime const &startDatetime, QDateTime &endDatetime, int nettoParkingTime);
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    // Daily ticket
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    QDateTime GetDailyTicketDuration(Configuration* cfg, const QDateTime start_datetime, uint8_t payment_option, bool carry_over);
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