Windows: set timezone as -3600.

compute_duration_for_parking_ticket() using QDateTime parameters.
Added new error code WRONG_ISO_TIME_FORMAT.

library/include/mobilisis/calculate_price.h

@@ -4,6 +4,9 @@
 #include <time.h>
 #include <inttypes.h>
 
+#include <QString>
+#include <QDateTime>
+
 #ifdef WIN32
 #ifdef CALCULATE_LIBRARY_EXPORTS
 #define CALCULATE_LIBRARY_API __declspec(dllexport)
@@ -18,9 +21,9 @@ class Configuration;
 
 typedef Configuration parking_tariff_t;
 
-#ifdef __cplusplus
+//#ifdef __cplusplus
-extern "C" {
+//extern "C" {
-#endif
+//#endif
 
 struct CALCULATE_LIBRARY_API price_t {
     uint32_t units;
@@ -30,16 +33,107 @@ struct CALCULATE_LIBRARY_API price_t {
     double vat;
 };
 
-bool CALCULATE_LIBRARY_API init_tariff(parking_tariff_t **tariff, char const *config_file);
+struct CALCULATE_LIBRARY_API CalcState {
+    enum class State : uint8_t {
+        SUCCESS,
+        ERROR_PARSING_ZONE_NR,
+        ERROR_LOADING_TARIFF,
+        ERROR_PARSING_TARIFF,
+        NEGATIVE_PARING_TIME,
+        INVALID_START_DATE,
+        WRONG_PARAM_VALUES,
+        WRONG_ISO_TIME_FORMAT,
+        ABOVE_MAX_PARKING_TIME,
+        BELOW_MIN_PARKING_TIME,
+        BELOW_MIN_PARKING_PRICE,
+        OVERPAID
+    };
+
+    State m_status;
+    QString m_desc;
+
+    explicit CalcState() : m_status(State::SUCCESS), m_desc("") {}
+
+    explicit operator bool() const noexcept {
+        return (m_status == State::SUCCESS);
+    }
+
+    explicit operator QString () const noexcept {
+        QString s;
+        switch (m_status) {
+        case State::SUCCESS:
+            s = "SUCCESS";
+            break;
+        case State::ERROR_PARSING_ZONE_NR:
+            s = "ERROR_PARSING_ZONE_NR";
+            break;
+        case State::ERROR_LOADING_TARIFF:
+            s = "ERROR_LOADING_TARIFF";
+            break;
+        case State::ERROR_PARSING_TARIFF:
+            s = "ERROR_PARSING_TARIFF";
+            break;
+        case State::NEGATIVE_PARING_TIME:
+            s = "NEGATIVE_PARKING_TIME";
+            break;
+        case State::ABOVE_MAX_PARKING_TIME:
+            s = "ABOVE_MAX_PARKING_TIME";
+            break;
+        case State::WRONG_PARAM_VALUES:
+            s = "WRONG_PARAM_VALUES";
+            break;
+        case State::BELOW_MIN_PARKING_TIME:
+            s = "BELOW_MIN_PARKING_TIME";
+            break;
+        case State::BELOW_MIN_PARKING_PRICE:
+            s = "BELOW_MIN_PARKING_PRICE";
+            break;
+        case State::OVERPAID:
+            s = "OVERPAID";
+            break;
+        case State::INVALID_START_DATE:
+            s = "INVALID_START_DATE";
+            break;
+        case State::WRONG_ISO_TIME_FORMAT:
+            s = "WRONG_ISO_TIME_FORMAT";
+        }
+        return s + ":" + m_desc;
+    }
+
+    CalcState &set(State s) { m_status = s; return *this; }
+    CalcState &setDesc(QString s) { m_desc = s; return *this; }
+};
+
+CalcState CALCULATE_LIBRARY_API init_tariff(parking_tariff_t **tariff,
+                                            char const *config_file);
 void CALCULATE_LIBRARY_API free_tariff(parking_tariff_t *tariff);
 int CALCULATE_LIBRARY_API get_zone_nr();
 
-bool CALCULATE_LIBRARY_API compute_price_for_parking_ticket(parking_tariff_t *tariff,
+CalcState CALCULATE_LIBRARY_API compute_price_for_parking_ticket(
+                                            parking_tariff_t *tariff,
                                             time_t start_parking_time,
                                             time_t end_parking_time,
                                             struct price_t *price);
-#ifdef __cplusplus
+
-} // extern "C"
+CalcState CALCULATE_LIBRARY_API compute_price_for_parking_ticket(
-#endif
+                                            parking_tariff_t *tariff,
+                                            QDateTime const &start_parking_time,
+                                            QDateTime const &end_parking_time,
+                                            struct price_t *price);
+
+CalcState CALCULATE_LIBRARY_API compute_duration_for_parking_ticket(
+                                            parking_tariff_t *tariff,
+                                            time_t start_parking_time,
+                                            double cost,
+                                            QString &duration);
+
+CalcState CALCULATE_LIBRARY_API compute_duration_for_parking_ticket(
+                                            parking_tariff_t *tariff,
+                                            QDateTime const &start_parking_time,
+                                            double cost,
+                                            QDateTime &ticketEndTime);
+//#ifdef __cplusplus
+//} // extern "C"
+//#endif
 
 #endif // CALCULATE_PRICE_H

library/src/calculate_price.cpp

@@ -16,19 +16,20 @@ int CALCULATE_LIBRARY_API get_zone_nr() {
         QFileInfo finfo(zone);
         if (finfo.size() <= 4) { // decimal 000\n
             if (zone.open(QIODevice::ReadOnly | QIODevice::Text)) {
-
                 QTextStream in(&zone);
                 return in.readLine(100).toInt();
-
             }
         }
     }
     return -1;
 }
 
-bool CALCULATE_LIBRARY_API init_tariff(parking_tariff_t **tariff, char const *config_file) {
+CalcState CALCULATE_LIBRARY_API init_tariff(parking_tariff_t **tariff, char const *config_file) {
     *tariff = new Configuration();
 
+    CalcState calcState;
+#if __linux__
+
     int const zone = get_zone_nr();
 
     // DEBUG
@@ -36,7 +37,9 @@ bool CALCULATE_LIBRARY_API init_tariff(parking_tariff_t **tariff, char const *co
     qCritical() << "      ... zone = " << zone;
 
     if (zone <= 0) {
-        return false;
+        delete *tariff;
+        *tariff = nullptr;
+        return calcState.set(CalcState::State::ERROR_PARSING_ZONE_NR);
     }
 
     QString confFile(config_file);
@@ -48,42 +51,75 @@ bool CALCULATE_LIBRARY_API init_tariff(parking_tariff_t **tariff, char const *co
     memset(buffer, 0x00, sizeof(buffer));
     snprintf(buffer, sizeof(buffer)-1, "tariff%02d.json", zone);
     confFile += buffer;
+#else // windows
+    QString confFile(config_file);
+#endif
 
     // DEBUG
     qCritical() << "      ... confFile = " << confFile;
 
     QFile fname(confFile);
-    if (fname.exists()) {
+    if (fname.exists() &&
-
+        fname.open(QIODevice::ReadOnly | QIODevice::Text)) {
-        // DEBUG
-        qCritical() << "      ... confFile exists";
-
-        if (fname.open(QIODevice::ReadOnly | QIODevice::Text)) {
-
         // DEBUG
         qCritical() << "      ... confFile is open";
 
         QString json = fname.readAll();
-            return (*tariff)->ParseJson(*tariff, json.toStdString().c_str());
+        if (! (*tariff)->ParseJson(*tariff, json.toStdString().c_str())) {
+            delete *tariff;
+            *tariff = nullptr;
+            return calcState.set(CalcState::State::ERROR_PARSING_TARIFF);
         }
+    } else {
+        delete *tariff;
+        *tariff = nullptr;
+        return calcState.set(CalcState::State::ERROR_LOADING_TARIFF);
     }
 
-    qCritical() << "init_tariff: Parsing tariff config (" << confFile << ") failed!";
+    qCritical() << "init_tariff: Parsing tariff config (" << confFile << ")";
 
-    return false;
+    return calcState;
 }
 
 void CALCULATE_LIBRARY_API free_tariff(parking_tariff_t *tariff) {
+    if (tariff != nullptr) {
         delete tariff;
+    }
 }
 
-bool CALCULATE_LIBRARY_API compute_price_for_parking_ticket(
+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
                                     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;
+
+    if (minMin < 0 || maxMin < 0 || maxMin < minMin) {
+        calcState.setDesc(QString("minMin=%1, maxMin=%2").arg(minMin).arg(maxMin));
+        return calcState.set(CalcState::State::WRONG_PARAM_VALUES);
+    }
+
     int const duration = end_parking_time - start_parking_time;
-    if (duration > 0) {
+    if (duration < 0) {
+        calcState.setDesc(QString("end=%1, start=%2")
+                            .arg(end_parking_time, start_parking_time));
+        return calcState.set(CalcState::State::NEGATIVE_PARING_TIME);
+    }
+    if (duration > maxMin) {
+        calcState.setDesc(QString("duration=%1, maxMin=%2").arg(duration).arg(maxMin));
+        return calcState.set(CalcState::State::ABOVE_MAX_PARKING_TIME);
+    }
+    if (duration < minMin) {
+        calcState.setDesc(QString("duration=%1, minMin=%2").arg(duration).arg(minMin));
+        return calcState.set(CalcState::State::BELOW_MIN_PARKING_TIME);
+    }
+    if (duration == 0) {
+        memset(price, 0x00, sizeof(*price));
+        return calcState.set(CalcState::State::SUCCESS);
+    }
+
     QDate const d(1970, 1, 1);
     QTime const t(0, 0, 0);
     QDateTime start(d, t, Qt::UTC);
@@ -94,16 +130,142 @@ bool CALCULATE_LIBRARY_API compute_price_for_parking_ticket(
                         tariff, PaymentOption::Option1,
                         cs.toLocal8Bit().constData(),
                         duration, false, true);
+        double minCost = tariff->PaymentOption.find(PaymentOption::Option1)->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);
+        }
         price->units = cost;
         price->netto = cost;
-            return true;
+    } else {
+        return calcState.set(CalcState::State::INVALID_START_DATE);
+    }
+
+    return calcState.set(CalcState::State::SUCCESS);
+}
+
+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) {
+    CalcState calcState;
+    double minMin = tariff->PaymentOption.find(PaymentOption::Option1)->second.pop_min_time;
+    double maxMin = tariff->PaymentOption.find(PaymentOption::Option1)->second.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
+                << "                      minMin: " << minMin << endl
+                << "                      maxMin: " << maxMin;
+
+
+    int const duration = (end_parking_time.toSecsSinceEpoch() -
+                          start_parking_time.toSecsSinceEpoch()) / 60;
+
+    if (duration < 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));
+        return calcState.set(CalcState::State::ABOVE_MAX_PARKING_TIME);
+    }
+    if (duration < minMin) {
+        calcState.setDesc(QString("duration=%1, minMin=%2").arg(duration, minMin));
+        return calcState.set(CalcState::State::BELOW_MIN_PARKING_TIME);
     }
-    } else
     if (duration == 0) {
         memset(price, 0x00, sizeof(*price));
-        return true;
+        return calcState.set(CalcState::State::SUCCESS);
     }
-    qCritical() << "ERROR start_parking_time (" << start_parking_time << ") <"
+
-                << "end_parking_time (" << end_parking_time << ")";
+    if (start_parking_time.isValid()) {
-    return false;
+        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;
+        if (cost < minCost) {
+            calcState.setDesc(QString("minCost=%1, cost=%2").arg(minCost, cost));
+            return calcState.set(CalcState::State::BELOW_MIN_PARKING_PRICE);
+        }
+
+        // DEBUG
+        qCritical() << "               -> calculated cost (price->netto) =  " << cost;
+
+        price->units = cost;
+        price->netto = cost;
+    } else {
+        return calcState.set(CalcState::State::INVALID_START_DATE);
+    }
+
+    return calcState.set(CalcState::State::SUCCESS);
+}
+
+CalcState CALCULATE_LIBRARY_API compute_duration_for_parking_ticket(
+                                            parking_tariff_t *tariff,
+                                            time_t start_parking_time,
+                                            double price,
+                                            QString &duration) {
+    CalcState calcState;
+    QDate const d(1970, 1, 1);
+    QTime const t(0, 0, 0);
+    QDateTime start(d, t, Qt::UTC);
+    start = start.toLocalTime().addSecs(start_parking_time * 60);
+    if (start.isValid()) {
+        QString cs = start.toString(Qt::ISODate);
+
+        // DEBUG
+        qCritical() << "compute_duration_for_parking_ticket(): ";
+        qCritical() << "      start (cs): " << cs;
+        qCritical() << "           price: " << price;
+
+        duration = calculator.GetDurationFromCost(tariff, PaymentOption::Option1,
+                                                  cs.toLocal8Bit().constData(),
+                                                  price, false, true).c_str();
+        QDateTime d = QDateTime::fromString(duration);
+        if (!d.isValid()) {
+            calcState.setDesc(QString("ticketEndTime=%1").arg(duration));
+            return calcState.set(CalcState::State::WRONG_ISO_TIME_FORMAT);
+        }
+    } else {
+        return calcState.set(CalcState::State::INVALID_START_DATE);
+    }
+
+    return calcState.set(CalcState::State::SUCCESS);
+}
+
+CalcState CALCULATE_LIBRARY_API compute_duration_for_parking_ticket(
+                                            parking_tariff_t *tariff,
+                                            QDateTime const &start_parking_time,
+                                            double price,
+                                            QDateTime &ticketEndTime) {
+    CalcState calcState;
+    if (start_parking_time.isValid()) {
+        QString cs = start_parking_time.toString(Qt::ISODate);
+        QString endTime = calculator.GetDurationFromCost(
+                                        tariff, PaymentOption::Option1,
+                                        cs.toLocal8Bit().constData(),
+                                        price, false, true).c_str();
+        ticketEndTime = QDateTime::fromString(endTime,Qt::ISODate);
+
+        // DEBUG
+        qCritical() << "compute_duration_for_parking_ticket(): ";
+        qCritical() << "                 endTime: " << endTime;
+        qCritical() << "           ticketEndTime: " << ticketEndTime;
+
+        if (!ticketEndTime.isValid()) {
+            calcState.setDesc(QString("ticketEndTime=%1").arg(endTime));
+            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

@@ -10,7 +10,12 @@ double total_cost = 0.0f;
 bool overtime = false;
 
 /// <inheritdoc/>
-std::string Calculator::GetDurationFromCost(Configuration* cfg, uint8_t payment_option, char const* start_datetime, double price, bool nextDay, bool prepaid)
+std::string Calculator::GetDurationFromCost(Configuration* cfg,
+                                            uint8_t payment_option,
+                                            char const* start_datetime, // given in local time
+                                            double price,
+                                            bool nextDay,
+                                            bool prepaid)
 {
 	// Get current date time from input
 	struct tm current_datetime = Utilities::DateTimeToStructTm(start_datetime);
@@ -266,11 +271,38 @@ std::string Calculator::GetDurationFromCost(Configuration* cfg, uint8_t payment_
 	cout << "Total minutes: " << (int)ret_val << endl;
     if (ret_val <= 0) return "PARKING NOT ALLOWED";
 
-	struct tm valid_until_datetime = *localtime(&valid_until_datetime_t);
+#ifdef __linux__
-	LOG_DEBUG("Ticket is valid until ", asctime(&valid_until_datetime));
+    #if !defined(_SVID_SOURCE) && !defined(_XOPEN_SOURCE)
+        // needed for timezone-correction
+        #error "!defined(_SVID_SOURCE) && !defined(_XOPEN_SOURCE)"
+    #else
+        // timezone correction: localtime() needs argument in UTC-timezone
+        // The global variable 'timezone' is set by tzset(), see
+        // https://linux.die.net/man/3/tzset, so I change of the timezone will
+        // also change the value of the variable 'timezone'.
+        valid_until_datetime_t += timezone;
+    #endif
+#else // windows, only for testing
+    static const long timezone = -3600;
+    valid_until_datetime_t += timezone;
+#endif
+
+    struct tm valid_until_datetime;
+    memset(&valid_until_datetime, 0x00, sizeof(valid_until_datetime));
+
+    if (!localtime_r(&valid_until_datetime_t, &valid_until_datetime)) {
+        return "LOCALTIME_R() ERROR";
+    }
+
+    // return in ISO-format: "%Y-%m-%dT%H:%M:%S"
+    char buf[128];
+    memset(buf, 0x00, sizeof(buf));
+    strftime(buf, sizeof(buf)-1, "%Y-%m-%dT%H:%M:%S", &valid_until_datetime);
+
+    LOG_DEBUG("Ticket is valid until ", buf);
 
 	total_duration_min = 0.0f;
-	return asctime(&valid_until_datetime);
+    return std::string(buf);
 }
 
 ///////////////////////////////////////
@@ -509,5 +541,6 @@ double Calculator::GetCostFromDuration(Configuration* cfg, uint8_t payment_optio
 
 	double ret_val = total_cost;
 	total_cost = 0.0f;
-	return floor(ret_val);
+    return ceil(ret_val);
+    // return floor(ret_val);
 }

main/main.cpp

@@ -80,7 +80,8 @@ int main() {
         memset(&now, 0, sizeof(now));
         strptime("2023-04-30T06:00:00", "%Y-%m-%dT%H:%M:%S", &now);
         now.tm_hour -= 1; // for ctime
-        for (int i=0; i<6*24; ++i) {
+        // for (int i=0; i<6*24; ++i) {
+        for (int i=0; i<1; ++i) {
             int const duration = 120;
             time_t t = mktime(&now);
             start_parking_time = t / 60;