start repository for mobilisis tariff-calculation

library/src/calculate_price.cpp

@@ -0,0 +1,87 @@
+#include "calculate_price.h"
+#include "configuration.h"
+#include "calculator_functions.h"
+#include "payment_option.h"
+
+#include <QFile>
+#include <QFileInfo>
+#include <QDateTime>
+#include <QDebug>
+
+static Calculator calculator;
+
+int get_zone_nr() {
+    QFile zone("/etc/zone_nr");
+    if (zone.exists()) {
+        QFileInfo finfo(zone);
+        if (finfo.size() <= 4) { // decimal 000\n
+            if (zone.open(QIODevice::ReadOnly | QIODevice::Text)) {
+                return zone.readLine().toInt();
+            }
+        }
+    }
+    return -1;
+}
+
+bool init_tariff(parking_tariff_t **tariff, char const *config_file) {
+    *tariff = new Configuration();
+
+    int const zone = get_zone_nr();
+    if (zone == -1) {
+        return false;
+    }
+
+    QString confFile(config_file);
+    if (!confFile.endsWith(QChar('/'))) {
+        confFile += "/";
+    }
+
+    char buffer[16];
+    memset(buffer, 0x00, sizeof(buffer));
+    snprintf(buffer, sizeof(buffer)-1, "tariff%02d.json", zone);
+    confFile += buffer;
+
+    QFile fname(confFile);
+    if (fname.exists()) {
+        if (fname.open(QIODevice::ReadOnly | QIODevice::Text)) {
+            QString json = fname.readAll();
+            return (*tariff)->ParseJson(*tariff, json.toStdString().c_str());
+        }
+    }
+
+    return false;
+}
+
+void free_tariff(parking_tariff_t *tariff) {
+    delete tariff;
+}
+
+bool 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) {
+    int const duration = end_parking_time - start_parking_time;
+    if (duration > 0) {
+        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);
+            double cost = calculator.GetCostFromDuration(
+                            tariff, PaymentOption::Option1,
+                            cs.toLocal8Bit().constData(),
+                            duration, false, true);
+            price->units = cost;
+            price->netto = cost;
+            return true;
+        }
+    } else
+    if (duration == 0) {
+        memset(price, 0x00, sizeof(*price));
+        return true;
+    }
+    qCritical() << "ERROR start_parking_time (" << start_parking_time << ") <"
+                << "end_parking_time (" << end_parking_time << ")";
+    return false;
+}