Fix: do not divide by durationUnit when calling recursively GetCostFromDuration()

but set price_per_unit to day_price, and divide end result by durationUnit to
work around the rounding problem (for e.g. a full hour price).

library/include/mobilisis/atb_project.h

@@ -0,0 +1,13 @@
+#ifndef ATB_PROJECT_H_INCLUDED
+#define ATB_PROJECT_H_INCLUDED
+
+#include <QString>
+
+class ATBProject {
+  public:
+    QString project;
+    QString version;
+    QString info;
+};
+
+#endif // ATB_PROJECT_H_INCLUDED

library/include/mobilisis/calculate_price.h

@@ -109,7 +109,9 @@ CalcState CALCULATE_LIBRARY_API init_tariff(parking_tariff_t **tariff,
 void CALCULATE_LIBRARY_API free_tariff(parking_tariff_t *tariff);
 int CALCULATE_LIBRARY_API get_zone_nr(int zone = -1);
 
-CalcState CALCULATE_LIBRARY_API compute_price_for_parking_ticket(
+int CALCULATE_LIBRARY_API compute_next_timestep(parking_tariff_t *tariff, int currentTimeMinutes, int UpDown);
+
+CalcState CALCULATE_LIBRARY_API compute_price_for_parking_ticket(       // deprecated
                                             parking_tariff_t *tariff,
                                             time_t start_parking_time,
                                             time_t end_parking_time,
@@ -118,10 +120,11 @@ CalcState CALCULATE_LIBRARY_API compute_price_for_parking_ticket(
 CalcState CALCULATE_LIBRARY_API compute_price_for_parking_ticket(
                                             parking_tariff_t *tariff,
                                             QDateTime const &start_parking_time,
-                                            QDateTime const &end_parking_time,
-                                            struct price_t *price);
+                                            int netto_parking_time,
+                                            QDateTime &end_parking_time,    // return value
+                                            struct price_t *price);         // return value
 
-CalcState CALCULATE_LIBRARY_API compute_duration_for_parking_ticket(
+CalcState CALCULATE_LIBRARY_API compute_duration_for_parking_ticket(        // deprecated
                                             parking_tariff_t *tariff,
                                             time_t start_parking_time,
                                             double cost,
@@ -131,12 +134,12 @@ CalcState CALCULATE_LIBRARY_API compute_duration_for_parking_ticket(
                                             parking_tariff_t *tariff,
                                             QDateTime const &start_parking_time,
                                             double cost,
-                                            QDateTime &ticketEndTime);
+                                            QDateTime &ticketEndTime);      // return value
 
 CalcState CALCULATE_LIBRARY_API compute_duration_for_daily_ticket(
                                             parking_tariff_t *tariff,
-                                            QString const &start_parking_time,
-                                            uint8_t paymentMethod);
+                                            QDateTime const &start_parking_time,
+                                            QDateTime &ticketEndTime);
 //#ifdef __cplusplus
 //} // extern "C"
 //#endif

library/include/mobilisis/calculator_functions.h

@@ -1,6 +1,7 @@
 #pragma once
 #include <iostream>
 #include "configuration.h"
+#include "payment_method.h"
 #include <QDateTime>
 using namespace std;
 
@@ -23,10 +24,25 @@ public:
 	/// <param name="tariff_cfg">Pointer to configuration</param>
 	/// <param name="vehicle_type">Type of vehicle</param>
 	/// <param name="start_datetime">Date/time of payment to be conducted in ISO8601 format (e.g. 2022-12-25T08:00:00Z) </param>
+    /// <param name="end_datetime">Date/time of park end to be conducted in ISO8601 format (e.g. 2022-12-25T08:00:00Z) </param>
 	/// <param name="durationMin">Duration of parking in minutes</param>
 	/// <returns>Returns cost (data type: double)</returns>
-	double GetCostFromDuration(Configuration* cfg, uint8_t vehicle_type, char const* start_datetime, double durationMin, bool nextDay = false, bool prepaid = false);
+    double GetCostFromDuration(Configuration* cfg, uint8_t vehicle_type, const QDateTime start_datetime, QDateTime & end_datetime, double durationMin, bool nextDay = false, bool prepaid = false);
 
     // Daily ticket
-    QString GetDailyTicketDuration(Configuration* cfg, QString start_datetime, uint8_t payment_option, bool carry_over);
+    QDateTime GetDailyTicketDuration(Configuration* cfg, const QDateTime start_datetime, uint8_t payment_option, bool carry_over);
+
+    //
+    // helper function to find time steps for a tariff with PaymentMethod::Steps
+    // (e.g. Schoenau/Koenigsee)
+    //
+    QList<int> GetTimeSteps(Configuration *cfg) const;
+
+private:
+    // Introduced for PaymentMethod::Steps (e.g. Schoenau)
+    // For tariff of following structure: only steps, no special days, nonstop.
+    uint32_t GetCostFromDuration(Configuration *cfg, QDateTime const &start, quint64 durationMinutes) const;
+    uint32_t GetCostFromDuration(Configuration *cfg, QDateTime const &start, QDateTime const &end) const;
+    uint32_t GetPriceForTimeStep(Configuration *cfg, int timeStep) const;
+    uint32_t GetDurationForPrice(Configuration *cfg, int price) const;
 };

library/include/mobilisis/configuration.h

@@ -20,6 +20,7 @@
 #include "member_type.h"
 #include "period_year.h"
 #include "payment_rate.h"
+#include "atb_project.h"
 
 using namespace std;
 using namespace rapidjson;
@@ -27,8 +28,8 @@ using namespace rapidjson;
 class Configuration
 {
 public:
-
-	ATBCurrency Currency;
+    ATBProject project;
+    ATBCurrency Currency;
 	ATBDuration duration;
 
 	multimap<int, ATBDuration> Duration;
@@ -48,6 +49,8 @@ public:
 	/// <returns>Returns operation status bool (OK | FAIL) </returns>
 	bool ParseJson(Configuration* cfg, const char* json);
 
+    ATBPaymentOption const & getPaymentOptions();
+
 private:
 	/// <summary>
 	/// Identify type of JSON member
@@ -55,4 +58,6 @@ private:
 	/// <param name="member_name"></param>
 	/// <returns></returns>
 	MemberType IdentifyJsonMember(const char* member_name);
+
+    ATBPaymentOption currentPaymentOptions;
 };

library/include/mobilisis/day_of_week.h

@@ -2,12 +2,12 @@
 
 enum DayOfWeek
 {
-	Saturday = 0x06,
-	Sunday = 0x01,
-	Monday = 0x02,
-	Tuesday = 0x02,
-	Wednesday = 0x03,
-	Thursday = 0x04,
-	Friday = 0x05,
-	UndefinedDay = 0xFF
-};
+    Monday = 0x01,
+    Tuesday = 0x02,
+    Wednesday = 0x03,
+    Thursday = 0x04,
+    Friday = 0x05,
+    Saturday = 0x06,
+    Sunday = 0x07,
+    UndefinedDay = 0xFF
+};

library/library.pro

@@ -65,7 +65,8 @@ HEADERS += \
     include/mobilisis/tariff_period_year.h \
     include/mobilisis/tariff_payment_rate.h \
     include/mobilisis/tariff_log.h \
-    include/mobilisis/calculate_price.h
+    include/mobilisis/calculate_price.h \
+    include/mobilisis/atb_project.h
 
 OTHER_FILES += src/main.cpp
 

library/src/calculate_price.cpp

@@ -92,14 +92,54 @@ void CALCULATE_LIBRARY_API free_tariff(parking_tariff_t *tariff) {
     }
 }
 
+
+//
+// UpDown 1 -> up; 0 -> down
+int CALCULATE_LIBRARY_API compute_next_timestep(parking_tariff_t *tariff, int currentTimeMinutes, int UpDown)
+{
+    static const QList<int> stepList = calculator.GetTimeSteps(tariff);
+
+    int currentStepIndex = stepList.indexOf(currentTimeMinutes);
+
+    if (currentStepIndex == -1) {
+        qCritical() << "compute_next_timestep() *NO STEP* for currentTimeMinutes (" << currentTimeMinutes << ")";
+        return  currentTimeMinutes;
+    }
+
+    if (UpDown == 1) { // UP
+        if (stepList[currentStepIndex] == stepList.last()) {
+            qCritical() << "compute_next_timestep() *NO NEXT STEP* for currentTimeMinutes (" << currentTimeMinutes << ")";
+            return  currentTimeMinutes;
+        }
+        else {
+            return stepList[currentStepIndex + 1];
+        }
+    }
+    if (UpDown == 0) { // DOWN
+        if (stepList[currentStepIndex] == stepList.first()) {
+            qCritical() << "compute_next_timestep() *NO PREVIOUS STEP* for currentTimeMinutes (" << currentTimeMinutes << ")";
+            return  currentTimeMinutes;
+        }
+        else {
+            return stepList[currentStepIndex - 1];
+        }
+    }
+
+    qCritical() << "compute_next_timestep() *CAN NOT COMPUTE* for currentTimeMinutes (" << currentTimeMinutes << ")";
+    return  currentTimeMinutes;
+}
+
+
+
+// this is currently not used
 CalcState CALCULATE_LIBRARY_API compute_price_for_parking_ticket(
         parking_tariff_t *tariff,
         time_t start_parking_time, // in minutes
-        time_t end_parking_time,   // in minutes
+        time_t end_parking_time,   // netto time in minutes
         struct price_t *price) {
     CalcState calcState;
-    double minMin = tariff->PaymentOption.find(PaymentOption::Option1)->second.pop_min_time;
-    double maxMin = tariff->PaymentOption.find(PaymentOption::Option1)->second.pop_max_time;
+    double minMin = tariff->PaymentOption.find(tariff->getPaymentOptions().pop_payment_method_id)->second.pop_min_time;
+    double maxMin = tariff->PaymentOption.find(tariff->getPaymentOptions().pop_payment_method_id)->second.pop_max_time;
 
     if (minMin < 0 || maxMin < 0 || maxMin < minMin) {
         calcState.setDesc(QString("minMin=%1, maxMin=%2").arg(minMin).arg(maxMin));
@@ -129,13 +169,15 @@ CalcState CALCULATE_LIBRARY_API compute_price_for_parking_ticket(
     QTime const t(0, 0, 0);
     QDateTime start(d, t, Qt::UTC);
     start = start.toLocalTime().addSecs(start_parking_time * 60);
+    QDateTime end(start);
     if (start.isValid()) {
-        QString cs = start.toString(Qt::ISODate);
         double cost = calculator.GetCostFromDuration(
-                    tariff, PaymentOption::Option1,
-                    cs.toLocal8Bit().constData(),
+                    tariff,
+                    tariff->getPaymentOptions().pop_payment_method_id,
+                    start,
+                    end,
                     duration, false, true);
-        double minCost = tariff->PaymentOption.find(PaymentOption::Option1)->second.pop_min_price;
+        double minCost = tariff->PaymentOption.find(tariff->getPaymentOptions().pop_payment_method_id)->second.pop_min_price;
         if (cost < minCost) {
             calcState.setDesc(QString("minCost=%1, cost=%2").arg(minCost).arg(cost));
             return calcState.set(CalcState::State::BELOW_MIN_PARKING_PRICE);
@@ -152,49 +194,50 @@ CalcState CALCULATE_LIBRARY_API compute_price_for_parking_ticket(
 CalcState CALCULATE_LIBRARY_API compute_price_for_parking_ticket(
         parking_tariff_t *tariff,
         QDateTime const &start_parking_time,
-        QDateTime const &end_parking_time,
-        struct price_t *price) {
+        int netto_parking_time,
+        QDateTime &end_parking_time,
+        struct price_t *price)
+{
     CalcState calcState;
-    double minMin = tariff->PaymentOption.find(PaymentOption::Option1)->second.pop_min_time;
-    double maxMin = tariff->PaymentOption.find(PaymentOption::Option1)->second.pop_max_time;
+    double minMin = tariff->getPaymentOptions().pop_min_time;
+    double maxMin = tariff->getPaymentOptions().pop_max_time;
 
     // DEBUG
     qCritical() << "compute_price_for_parking_ticket() " << endl
                 << "          start_parking_time: " << start_parking_time << endl
-                << "            end_parking_time: " << end_parking_time   << endl
+                << "          netto_parking_time: " << netto_parking_time << endl
                 << "                      minMin: " << minMin << endl
                 << "                      maxMin: " << maxMin;
 
 
-    int const duration = (end_parking_time.toSecsSinceEpoch() -
-                          start_parking_time.toSecsSinceEpoch()) / 60;
-
-    if (duration < 0) {
+    if (netto_parking_time < 0) {
         calcState.setDesc(QString("end=%1, start=%2")
                           .arg(end_parking_time.toString(Qt::ISODate),
                                start_parking_time.toString(Qt::ISODate)));
         return calcState.set(CalcState::State::NEGATIVE_PARING_TIME);
     }
-    if (duration > maxMin) {
-        calcState.setDesc(QString("duration=%1, maxMin=%2").arg(duration, maxMin));
+    if (netto_parking_time > maxMin) {
+        calcState.setDesc(QString("duration=%1, maxMin=%2").arg(netto_parking_time).arg(maxMin));
         return calcState.set(CalcState::State::ABOVE_MAX_PARKING_TIME);
     }
-    if (duration < minMin) {
-        calcState.setDesc(QString("duration=%1, minMin=%2").arg(duration, minMin));
+    if (netto_parking_time < minMin) {
+        calcState.setDesc(QString("duration=%1, minMin=%2").arg(netto_parking_time).arg(minMin));
         return calcState.set(CalcState::State::BELOW_MIN_PARKING_TIME);
     }
-    if (duration == 0) {
+    if (netto_parking_time == 0) {
         memset(price, 0x00, sizeof(*price));
         return calcState.set(CalcState::State::SUCCESS);
     }
 
     if (start_parking_time.isValid()) {
-        QString cs = start_parking_time.toString(Qt::ISODate);
         double cost = calculator.GetCostFromDuration(
-                    tariff, PaymentOption::Option1,
-                    cs.toLocal8Bit().constData(),
-                    duration, false, true);
-        double minCost = tariff->PaymentOption.find(PaymentOption::Option1)->second.pop_min_price;
+                        tariff,
+                        tariff->getPaymentOptions().pop_payment_method_id,
+                        start_parking_time,         // starting time
+                        end_parking_time,           // return value: end time
+                        netto_parking_time,         // minutes, netto
+                        false, true);
+        double minCost = tariff->getPaymentOptions().pop_min_price;
         if (cost < minCost) {
             calcState.setDesc(QString("minCost=%1, cost=%2").arg(minCost, cost));
             return calcState.set(CalcState::State::BELOW_MIN_PARKING_PRICE);
@@ -230,10 +273,11 @@ CalcState CALCULATE_LIBRARY_API compute_duration_for_parking_ticket(
         qCritical() << "      start (cs): " << cs;
         qCritical() << "           price: " << price;
 
-        duration = calculator.GetDurationFromCost(tariff, PaymentOption::Option1,
+        duration = calculator.GetDurationFromCost(tariff,
+                                                  tariff->getPaymentOptions().pop_payment_method_id,
                                                   cs.toLocal8Bit().constData(),
                                                   price, false, true).c_str();
-        QDateTime d = QDateTime::fromString(duration);
+        QDateTime d = QDateTime::fromString(duration, Qt::ISODate);
         if (!d.isValid()) {
             calcState.setDesc(QString("ticketEndTime=%1").arg(duration));
             return calcState.set(CalcState::State::WRONG_ISO_TIME_FORMAT);
@@ -249,12 +293,14 @@ CalcState CALCULATE_LIBRARY_API compute_duration_for_parking_ticket(
         parking_tariff_t *tariff,
         QDateTime const &start_parking_time,
         double price,
-        QDateTime &ticketEndTime) {
+        QDateTime &ticketEndTime)
+{
     CalcState calcState;
     if (start_parking_time.isValid()) {
         QString cs = start_parking_time.toString(Qt::ISODate);
         QString endTime = calculator.GetDurationFromCost(
-                    tariff, PaymentOption::Option1,
+                    tariff,
+                    tariff->getPaymentOptions().pop_payment_method_id,
                     cs.toLocal8Bit().constData(),
                     price, false, true).c_str();
         ticketEndTime = QDateTime::fromString(endTime,Qt::ISODate);
@@ -275,11 +321,28 @@ CalcState CALCULATE_LIBRARY_API compute_duration_for_parking_ticket(
     return calcState.set(CalcState::State::SUCCESS);
 }
 
-CalcState CALCULATE_LIBRARY_API compute_duration_for_daily_ticket(parking_tariff_t *tariff, QString const &start_parking_time,uint8_t paymentMethod)
+CalcState CALCULATE_LIBRARY_API compute_duration_for_daily_ticket(parking_tariff_t *tariff, QDateTime const &start_parking_time, QDateTime &ticketEndTime)
 {
     CalcState calcState;
-    QString result = calculator.GetDailyTicketDuration(tariff, start_parking_time, PaymentOption::Option1,false);
-    qDebug() << "DailyTicket() => " + result;
+    if (start_parking_time.isValid()) {
+
+        ticketEndTime = calculator.GetDailyTicketDuration(tariff,
+                                                            start_parking_time,
+                                                            tariff->getPaymentOptions().pop_payment_method_id,
+                                                            false);    // carry over
+
+        // DEBUG
+        qCritical() << "compute_duration_for_daily_ticket(): ";
+        qCritical() << "           ticketEndTime: " << ticketEndTime;
+
+        if (!ticketEndTime.isValid()) {
+            calcState.setDesc(QString("ticketEndTime=%1").arg(ticketEndTime.toString(Qt::ISODate)));
+            return calcState.set(CalcState::State::WRONG_ISO_TIME_FORMAT);
+        }
+
+    } else {
+        return calcState.set(CalcState::State::INVALID_START_DATE);
+    }
 
     return calcState.set(CalcState::State::SUCCESS);
 }

library/src/calculator_functions.cpp

@@ -1,5 +1,5 @@
 #include "calculator_functions.h"
-#include "payment_method.h"
+#include "payment_option.h"
 #include "utilities.h"
 #include "tariff_log.h"
 
@@ -19,20 +19,25 @@ inline struct tm* localtime_r(const time_t *clock, struct tm* result){
 }
 #endif
 
-QString Calculator::GetDailyTicketDuration(Configuration* cfg, QString start_datetime, uint8_t payment_option, bool carry_over)
+QDateTime Calculator::GetDailyTicketDuration(Configuration* cfg, const QDateTime start_datetime, uint8_t payment_option, bool carry_over)
 {
-    if(start_datetime.isNull() || start_datetime.isEmpty()) return NULL;
+    if(!start_datetime.isValid()) {
+        return QDateTime();
+    }
 
     double day_price = 0.0f;
     int current_special_day_id = -1;
-    bool is_special_day = Utilities::CheckSpecialDay(cfg, start_datetime.toStdString().c_str(), &current_special_day_id, &day_price);
+    bool is_special_day = Utilities::CheckSpecialDay(cfg, start_datetime.toString(Qt::ISODate).toStdString().c_str(), &current_special_day_id, &day_price);
 
-    QDateTime inputDateTime = QDateTime::fromString(start_datetime, Qt::ISODate);
+    QDateTime inputDateTime = start_datetime;
     QTime worktime_from;
     QTime worktime_to;
 
     int daily_card_price = cfg->PaymentOption.find(payment_option)->second.pop_daily_card_price;
-    if(daily_card_price <= 0) return "Daily ticket price zero or less";
+    if(daily_card_price <= 0) {
+        LOG_ERROR("Calculator::GetDailyTicketDuration(): Daily ticket price zero or less");
+        return QDateTime();
+    }
 
     if(is_special_day)
     {
@@ -46,21 +51,21 @@ QString Calculator::GetDailyTicketDuration(Configuration* cfg, QString start_dat
         {
             // Go to next day if outside worktime
             inputDateTime = inputDateTime.addSecs(86400);
-            return GetDailyTicketDuration(cfg,inputDateTime.toString(Qt::ISODate), payment_option,true);
+            return GetDailyTicketDuration(cfg,inputDateTime, payment_option,true);
         }
 
         if(day_price <=0)
         {
             // Go to next day if special day price is 0
             inputDateTime = inputDateTime.addSecs(86400);
-            return GetDailyTicketDuration(cfg,inputDateTime.toString(Qt::ISODate), payment_option,true);
+            return GetDailyTicketDuration(cfg,inputDateTime, payment_option,true);
         }
 
         int diff = abs(inputDateTime.time().secsTo(worktime_to));
         inputDateTime = inputDateTime.addSecs(diff);
 
         //qDebug() << "Ticket is valid until: " << inputDateTime.toString(Qt::ISODate) << "price = " << daily_card_price << ", duration = " << diff / 60;
-        return inputDateTime.toString(Qt::ISODate) + ", price = " + to_string(daily_card_price).c_str() + ", duration = " + to_string((diff/60)).c_str();
+        return inputDateTime;
     }
     else
     {
@@ -76,7 +81,7 @@ QString Calculator::GetDailyTicketDuration(Configuration* cfg, QString start_dat
         if(found <=0)
         {
             inputDateTime = inputDateTime.addSecs(86400);
-            return GetDailyTicketDuration(cfg,inputDateTime.toString(Qt::ISODate), payment_option,true);
+            return GetDailyTicketDuration(cfg,inputDateTime, payment_option,true);
         }
         else
         {
@@ -92,18 +97,18 @@ QString Calculator::GetDailyTicketDuration(Configuration* cfg, QString start_dat
             {
                 // Go to next day if outside worktime
                 inputDateTime = inputDateTime.addSecs(86400);
-                return GetDailyTicketDuration(cfg,inputDateTime.toString(Qt::ISODate), payment_option,true);
+                return GetDailyTicketDuration(cfg,inputDateTime, payment_option,true);
             }
 
             int diff = abs(inputDateTime.time().secsTo(worktime_to));
             inputDateTime = inputDateTime.addSecs(diff);
 
-            //qDebug() << "Ticket is valid until: " << inputDateTime.toString(Qt::ISODate) << "price = " << daily_card_price << ", duration = " << diff / 60;
-            return inputDateTime.toString(Qt::ISODate) + ", price = " + to_string(daily_card_price).c_str() + ", duration = " + to_string((diff/60)).c_str();
+            //qDebug() << "Ticket is valid until: " << inputDateTime.toString(Qt::ISODate) << "price = " << daily_card_price << ", duration = " << diff / 60;            
+            return inputDateTime;
         }
     }
 
-    return NULL;
+    return QDateTime();
 }
 /// <inheritdoc/>
 std::string Calculator::GetDurationFromCost(Configuration* cfg,
@@ -113,22 +118,35 @@ std::string Calculator::GetDurationFromCost(Configuration* cfg,
                                             bool nextDay,
                                             bool prepaid)
 {
+
     // Get input date
     QDateTime inputDate = QDateTime::fromString(start_datetime,Qt::ISODate);
 
+    // use tariff with structure as for instance Schnau, Koenigsee:
+    // without given YearPeriod, SpecialDays and SpecialDaysWorktime
+    if (cfg->YearPeriod.size() == 0
+        && cfg->SpecialDays.size() == 0
+        && cfg->SpecialDaysWorktime.size() == 0)
+    {
+        inputDate = inputDate.addSecs(GetDurationForPrice(cfg, price) * 60);
+
+        return inputDate.toString(Qt::ISODate).toStdString();
+    }
+
+
     // Get day of week
     int weekdayId = 0;
     weekdayId = Utilities::ZellersAlgorithm(inputDate.date().day(),inputDate.date().month(),inputDate.date().year());
 
     //Get min and max time defined in JSON
     double minMin = 0;
-    minMin = cfg->PaymentOption.find(payment_option)->second.pop_min_time;
+    minMin = cfg->getPaymentOptions().pop_min_time;
 
     double maxMin = 0;
-    maxMin = cfg->PaymentOption.find(payment_option)->second.pop_max_time;
+    maxMin = cfg->getPaymentOptions().pop_max_time;
 
     double min_price = 0;
-    min_price = cfg->PaymentOption.find(payment_option)->second.pop_min_price;
+    min_price = cfg->getPaymentOptions().pop_min_price;
 
     if(price < min_price)
     {
@@ -201,16 +219,9 @@ std::string Calculator::GetDurationFromCost(Configuration* cfg,
 
     if (price_per_unit < 0) price_per_unit = 1.0f;
 
-    if((price/price_per_unit) < minMin) return "PARKING NOT ALLOWED";
+    // if((price/price_per_unit) < minMin) return "PARKING NOT ALLOWED";
     LOG_DEBUG("Calculated price per minute: ", price_per_unit);
 
-    if (price_per_unit < 0)
-    {
-        inputDate = inputDate.addDays(1);
-        inputDate.setTime(worktime_from);
-        return GetDurationFromCost(cfg, payment_option, inputDate.toString(Qt::ISODate).toStdString().c_str(), money_left, true);
-    }
-
     // If overtime flag is set
     if (overtime || nextDay)
     {
@@ -314,15 +325,15 @@ std::string Calculator::GetDurationFromCost(Configuration* cfg,
     //    }
 
     double ret_val = 0;
-    double calc_price = (int)total_duration_min - (int)price / price_per_unit;
+    // double calc_price = (int)total_duration_min - (int)price / price_per_unit;
 
-    if (calc_price > 0 && total_duration_min > 0)
-    {
-        inputDate.addSecs(-(int)ceil(calc_price) * 60);
-    }
+    //if (calc_price > 0 && total_duration_min > 0)
+    //{
+    //    inputDate = inputDate.addSecs(-(int)ceil(calc_price) * 60);
+    //}
 
     if(price >= min_price && total_duration_min >= minMin)
-        qDebug() << "Valid until: " << inputDate.toString(Qt::ISODate);
+        qDebug() << "GetDurationFromCost(): Valid until: " << inputDate.toString(Qt::ISODate);
     else
     {
         qDebug() << "Parking not allowed";
@@ -341,10 +352,52 @@ std::string Calculator::GetDurationFromCost(Configuration* cfg,
 ///////////////////////////////////////
 
 /// <inheritdoc/>
-double Calculator::GetCostFromDuration(Configuration* cfg, uint8_t payment_option, const char* start_datetime, double durationMin, bool nextDay, bool prepaid)
+///
+
+uint32_t Calculator::GetCostFromDuration(Configuration *cfg,
+                                         QDateTime const &start,
+                                         quint64 timeStepInMinutes) const {
+    // for instance, a tariff as used in Schoenau, Koenigssee: only steps, no
+    // special days, nonstop.
+    if (cfg->YearPeriod.size() == 0
+     && cfg->SpecialDays.size() == 0
+     && cfg->SpecialDaysWorktime.size() == 0) {
+        QDateTime const end = start.addSecs(timeStepInMinutes*60);
+        return GetCostFromDuration(cfg, start, end);
+    }
+    return 0;
+}
+
+uint32_t Calculator::GetCostFromDuration(Configuration * cfg,
+                                         QDateTime const &start,
+                                         QDateTime const &end) const {
+    if (cfg->YearPeriod.size() == 0
+     && cfg->SpecialDays.size() == 0
+     && cfg->SpecialDaysWorktime.size() == 0) {
+        int const timeStepInMinutes = start.secsTo(end) / 60;
+        return GetPriceForTimeStep(cfg, timeStepInMinutes);
+    }
+    return 0;
+}
+
+
+
+
+///////////////////////////////////////
+
+/// <inheritdoc/>
+double Calculator::GetCostFromDuration(Configuration* cfg, uint8_t payment_option, const QDateTime start_datetime, QDateTime & end_datetime,  double durationMin, bool nextDay, bool prepaid)
 {
+    if (cfg->YearPeriod.size() == 0
+        && cfg->SpecialDays.size() == 0
+        && cfg->SpecialDaysWorktime.size() == 0)
+    {
+        end_datetime = start_datetime.addSecs(durationMin*60);
+        return GetCostFromDuration(cfg, start_datetime, end_datetime);
+    }
+
     // Get input date
-    QDateTime inputDate = QDateTime::fromString(start_datetime,Qt::ISODate);
+    QDateTime inputDate = start_datetime;
 
     // Get day of week
     int weekdayId = 0;
@@ -403,11 +456,13 @@ double Calculator::GetCostFromDuration(Configuration* cfg, uint8_t payment_optio
     double price_per_unit = 0.0f;
     QTime worktime_from;
     QTime worktime_to;
+    double durationUnit = 60.0;
 
     if(is_special_day)
     {
-        // Set special day price
-        price_per_unit = Utilities::CalculatePricePerUnit(day_price);
+        // Set price_per_unit to special day price: at the end of the calculation
+        // divide by durationUnit to get correct price.
+        price_per_unit = day_price;
         worktime_from = QTime::fromString(cfg->SpecialDaysWorktime.find(current_special_day_id)->second.pedwt_time_from.c_str());
         worktime_to = QTime::fromString(cfg->SpecialDaysWorktime.find(current_special_day_id)->second.pedwt_time_to.c_str());
     }
@@ -419,8 +474,13 @@ double Calculator::GetCostFromDuration(Configuration* cfg, uint8_t payment_optio
         day_price = cfg->PaymentRate.find(pop_id)->second.pra_price;
 
         int durationId = cfg->PaymentRate.find(pop_id)->second.pra_payment_unit_id;
-        double durationUnit = cfg->Duration.find(durationId)->second.pun_duration;
-        price_per_unit = Utilities::CalculatePricePerUnit(day_price,durationUnit);
+        durationUnit = cfg->Duration.find(durationId)->second.pun_duration;
+        if (durationUnit == 0) {
+            durationUnit = 60.0;
+        }
+        // Set price_per_unit to day price: at the end of the calculation
+        // divide by durationUnit to get correct price.
+        price_per_unit = day_price;
 
         // If no working day found, skip it (recursively call method again)
         size_t found = 0;
@@ -431,7 +491,7 @@ double Calculator::GetCostFromDuration(Configuration* cfg, uint8_t payment_optio
         {
             LOG_DEBUG("- No workday found, trying to find next available day");
             inputDate = inputDate.addDays(1);
-            return floor(GetCostFromDuration(cfg, payment_option, inputDate.toString(Qt::ISODate).toStdString().c_str(), durationMin, true, prepaid));
+            return GetCostFromDuration(cfg, payment_option, inputDate, end_datetime, durationMin, true, prepaid);
         }
         worktime_from = QTime::fromString(cfg->WeekDaysWorktime.find(weekdayId)->second.pwd_time_from.c_str());
         worktime_to = QTime::fromString(cfg->WeekDaysWorktime.find(weekdayId)->second.pwd_time_to.c_str());
@@ -444,7 +504,7 @@ double Calculator::GetCostFromDuration(Configuration* cfg, uint8_t payment_optio
     {
         inputDate = inputDate.addDays(1);
         inputDate.setTime(worktime_from);
-        return GetCostFromDuration(cfg, payment_option, inputDate.toString(Qt::ISODate).toStdString().c_str(), durationMin, true, prepaid);
+        return GetCostFromDuration(cfg, payment_option, inputDate, end_datetime, durationMin, true, prepaid);
     }
 
     // If overtime flag is set
@@ -474,7 +534,7 @@ double Calculator::GetCostFromDuration(Configuration* cfg, uint8_t payment_optio
         {
             LOG_DEBUG(" *** PREPAID *** Current time is past the time range end, searching for next available day");
             inputDate = inputDate.addDays(1);
-            return GetCostFromDuration(cfg, payment_option, inputDate.toString(Qt::ISODate).toStdString().c_str(), durationMin, true, prepaid);
+            return GetCostFromDuration(cfg, payment_option, inputDate, end_datetime, durationMin, true, prepaid);
         }
     }
 
@@ -526,7 +586,7 @@ double Calculator::GetCostFromDuration(Configuration* cfg, uint8_t payment_optio
             LOG_DEBUG("Reached end of worktime, searching for the next working day");
             inputDate = inputDate.addDays(1);
             overtime = true;
-            return GetCostFromDuration(cfg, payment_option, inputDate.toString(Qt::ISODate).toStdString().c_str(), total_duration_min);
+            return GetCostFromDuration(cfg, payment_option, inputDate, end_datetime, total_duration_min);
         }
 
         // Increment input date minutes for each monetary unit
@@ -535,8 +595,75 @@ double Calculator::GetCostFromDuration(Configuration* cfg, uint8_t payment_optio
         total_cost += price_per_unit;
 
     }
-    qDebug() << "Valid until:" << inputDate.toString(Qt::ISODate).toStdString().c_str();
+    qDebug() << "GetCostFromDuration(): Valid until:" << inputDate.toString(Qt::ISODate).toStdString().c_str();
+
+    end_datetime = inputDate;
+
     double ret_val = total_cost;
     total_cost = 0.0f;
-    return ceil(ret_val);
+    return round(ret_val / durationUnit);
+}
+
+
+
+QList<int> Calculator::GetTimeSteps(Configuration *cfg) const {
+    QList<int> timeSteps;
+
+    int const pop_id = cfg->getPaymentOptions().pop_id;
+
+    for (auto[itr, rangeEnd] = cfg->PaymentRate.equal_range(pop_id); itr != rangeEnd; ++itr)
+    {
+        int const durationId = itr->second.pra_payment_unit_id;
+        int const durationUnit = cfg->Duration.find(durationId)->second.pun_duration;
+        timeSteps << durationUnit;
+    }
+
+    return timeSteps;
+}
+
+uint32_t Calculator::GetPriceForTimeStep(Configuration *cfg, int timeStep) const {
+
+    int const pop_id = cfg->getPaymentOptions().pop_id;
+
+    for (auto[itr, rangeEnd] = cfg->PaymentRate.equal_range(pop_id); itr != rangeEnd; ++itr)
+    {
+        int const payment_unit_id = itr->second.pra_payment_unit_id;
+        int const pun_id = cfg->Duration.find(payment_unit_id)->second.pun_id;
+
+        Q_ASSERT(pun_id == payment_unit_id);
+
+        int const pun_duration = cfg->Duration.find(payment_unit_id)->second.pun_duration;
+        if (timeStep == pun_duration) {
+            return (uint32_t)(itr->second.pra_price);
+        }
+    }
+
+    return 0;
+}
+
+/**
+ * private: read price directly from config file (used with PaymentMethod::Steps)
+ *
+ * return duration in minutes for greatest pra_price < price
+ */
+
+uint32_t Calculator::GetDurationForPrice(Configuration *cfg, int price) const {
+    int const pop_id = cfg->getPaymentOptions().pop_id; 
+    uint32_t duration = 0;
+
+    for (auto[itr, rangeEnd] = cfg->PaymentRate.equal_range(pop_id); itr != rangeEnd; ++itr)
+    {
+        int const durationId = itr->second.pra_payment_unit_id;
+        int const pra_price = itr->second.pra_price;
+        uint32_t const durationUnit = cfg->Duration.find(durationId)->second.pun_duration;
+
+        if (price == pra_price) {
+            return durationUnit;
+        }
+        if (pra_price < price) {
+            duration = durationUnit;
+        }
+    }
+
+    return duration;
 }

library/src/configuration.cpp

@@ -59,8 +59,9 @@ bool Configuration::ParseJson(Configuration* cfg, const char* json)
 			|| !document.HasMember("PaymentRate")
 			|| !document.HasMember("Duration")
 			//|| !document.HasMember("WeekDays")
-			|| !document.HasMember("SpecialDaysWorktime")
-			|| !document.HasMember("SpecialDays"))
+            //|| !document.HasMember("SpecialDaysWorktime")
+            //|| !document.HasMember("SpecialDays")
+            )
 		{
 			printf("%s", "Error: not a valid configuration JSON\n");
 			return false;
@@ -87,13 +88,26 @@ bool Configuration::ParseJson(Configuration* cfg, const char* json)
 			const char* mb_name = i->name.GetString();
             if (mb_name == NULL) continue;
 
-            // if (!document[mb_name].IsArray()) {
-                std::string const _mb_name(mb_name);
-                if (_mb_name == "version" || _mb_name == "project" ||
-                    _mb_name == "zone" || _mb_name == "info") {
+            if (document[mb_name].IsString()) {
+                QString const _mb_name(mb_name);
+                if (_mb_name.startsWith("Project", Qt::CaseInsensitive)) {
+                    cfg->project.project = document[mb_name].GetString();
+                    continue;
+                 }
+                if (_mb_name.startsWith("Version", Qt::CaseInsensitive)) {
+                    cfg->project.version = document[mb_name].GetString();
                     continue;
                 }
-            // }
+                if (_mb_name.startsWith("Info", Qt::CaseInsensitive)) {
+                    cfg->project.info = document[mb_name].GetString();
+                    continue;
+                }
+            }
+
+            // ... everything else should be an array
+            if (!document[mb_name].IsArray()) {
+                continue;
+            }
 
 			//printf(" -%s\n", mb_name);
 
@@ -155,7 +169,8 @@ bool Configuration::ParseJson(Configuration* cfg, const char* json)
 						else if (strcmp(inner_obj_name, "pop_min_price") == 0) PaymentOption.pop_min_price = k->value.GetDouble();
 						else if (strcmp(inner_obj_name, "pop_carry_over") == 0) PaymentOption.pop_carry_over = k->value.GetInt();
                         else if (strcmp(inner_obj_name, "pop_daily_card_price") == 0) PaymentOption.pop_daily_card_price = k->value.GetInt();
-						break;
+                        this->currentPaymentOptions = PaymentOption;
+                        break;
 					case MemberType::DurationType:
 						if (strcmp(inner_obj_name, "pun_id") == 0) Duration.pun_id = k->value.GetInt();
 						else if (strcmp(inner_obj_name, "pun_label") == 0) Duration.pun_label = k->value.GetString();
@@ -245,3 +260,10 @@ bool Configuration::ParseJson(Configuration* cfg, const char* json)
 		return false;
 	}
 }
+
+
+
+const ATBPaymentOption & Configuration::getPaymentOptions()
+{
+    return this->currentPaymentOptions;
+}

main/main.cpp

@@ -26,11 +26,47 @@ extern "C" char* strptime(const char* s,
 
 #include <QDebug>
 #include <QDateTime>
+#include <QDir>
+
+#include <fstream>
+#include <sstream>
+#include "calculator_functions.h"
+#include <calculate_price.h>
+
+
 int main() {
 
-    parking_tariff_t *tariff = 0;
-    if (init_tariff(&tariff, "C:\\Users\\MROD\\Documents\\QtCreator\\build-MOBILISIS-Calculator-Desktop_Qt_5_12_12_MSVC2017_32bit-Debug\\main\\etc\\psa_tariff\\zone1.json"))
+    std::ifstream input(QDir::homePath().append("/tariff01.json").toStdString());
+    std::stringstream sstr;
+    while(input >> sstr.rdbuf());
+    std::string json(sstr.str());
+
+    Calculator calculator;
+    Configuration cfg;
+
+    bool isParsed = cfg.ParseJson(&cfg, json.c_str());
+    cout << endl;
+
+    char const *startDate = "";
+
+    if (isParsed)
     {
+        startDate = "2023-05-10T13:52:18.665Z";
+        std::string duration = calculator.GetDurationFromCost(&cfg, 3, (char *)startDate, 33, false, true);
+        cout << "---> startDate " << startDate << " _price_ = " << 33
+             << " Total duration is: " << duration << endl;
+    }
+
+    return 0;
+
+
+
+
+
+
+
+    parking_tariff_t *tariff = 0;
+    if (init_tariff(&tariff, "/etc/psa_tariff/")) {      
         struct price_t price;
         memset(&price, 0x00, sizeof(price));
         QDateTime start = QDateTime::fromString("2023-05-11T07:50:00",Qt::ISODate); //QDateTime::currentDateTime();
@@ -52,7 +88,7 @@ int main() {
         }
 
         // Daily ticket
-        compute_duration_for_daily_ticket(tariff,start.toString(Qt::ISODate),3);
+        //compute_duration_for_daily_ticket(tariff,start.toString(Qt::ISODate),3);
 
         //Configuration* cfg, QString start_datetime, uint8_t payment_option, bool carry_over
         //        // tests

main/main.pro

@@ -7,6 +7,8 @@ QMAKE_CFLAGS = -c -pipe -std=c11 -g -O0 -Wall -Wno-attributes -W -DDEBUG -D_REEN
 QMAKE_CXX_FLAGS += -std=c11
 
 INCLUDEPATH += $$_PRO_FILE_PWD_/../../MOBILISIS-Calculator/library/include/mobilisis/
+INCLUDEPATH += $$_PRO_FILE_PWD_/../../MOBILISIS-Calculator/library/include/rapidjson/
+INCLUDEPATH += $$_PRO_FILE_PWD_/../../MOBILISIS-Calculator/library/include/
 INCLUDEPATH += .
 
 unix {