weather: Switch to std::optional for Forecast days

Also only iterate over the number of days actually in use, rather than
MaxNbForecastDays.

Author: FintasticMan

src/components/ble/SimpleWeatherService.cpp

@@ -52,7 +52,7 @@ namespace {
   SimpleWeatherService::Forecast CreateForecast(const uint8_t* dataBuffer) {
     auto timestamp = static_cast<uint64_t>(ToUInt64(&dataBuffer[2]));
 
-    std::array<SimpleWeatherService::Forecast::Day, SimpleWeatherService::MaxNbForecastDays> days;
+    std::array<std::optional<SimpleWeatherService::Forecast::Day>, SimpleWeatherService::MaxNbForecastDays> days;
     const uint8_t nbDaysInBuffer = dataBuffer[10];
     const uint8_t nbDays = std::min(SimpleWeatherService::MaxNbForecastDays, nbDaysInBuffer);
     for (int i = 0; i < nbDays; i++) {
@@ -112,9 +112,9 @@ int SimpleWeatherService::OnCommand(struct ble_gatt_access_ctxt* ctxt) {
         for (int i = 0; i < 5; i++) {
           NRF_LOG_INFO("\t[%d] Min: %d - Max : %d - Icon : %d",
                        i,
-                       forecast->days[i].minTemperature.PreciseCelsius(),
-                       forecast->days[i].maxTemperature.PreciseCelsius(),
-                       forecast->days[i].iconId);
+                       forecast->days[i]->minTemperature.PreciseCelsius(),
+                       forecast->days[i]->maxTemperature.PreciseCelsius(),
+                       forecast->days[i]->iconId);
         }
       }
       break;

src/components/ble/SimpleWeatherService.h

@@ -63,7 +63,7 @@ namespace Pinetime {
 
       class Temperature {
       public:
-        explicit Temperature(int16_t raw = 0) : raw {raw} {
+        explicit Temperature(int16_t raw) : raw {raw} {
         }
 
         [[nodiscard]] int16_t PreciseCelsius() const {
@@ -129,7 +129,7 @@ namespace Pinetime {
           bool operator==(const Day& other) const;
         };
 
-        std::array<Day, MaxNbForecastDays> days;
+        std::array<std::optional<Day>, MaxNbForecastDays> days;
 
         bool operator==(const Forecast& other) const;
       };

src/displayapp/screens/Weather.cpp

@@ -153,22 +153,22 @@ void Weather::Refresh() {
     if (optCurrentForecast) {
       std::tm localTime = *std::localtime(reinterpret_cast<const time_t*>(&optCurrentForecast->timestamp));
 
-      for (int i = 0; i < Controllers::SimpleWeatherService::MaxNbForecastDays; i++) {
-        int16_t minTemp = optCurrentForecast->days[i].maxTemperature.Celsius();
-        int16_t maxTemp = optCurrentForecast->days[i].minTemperature.Celsius();
+      for (int i = 0; i < optCurrentForecast->nbDays; i++) {
+        int16_t minTemp = optCurrentForecast->days[i]->maxTemperature.Celsius();
+        int16_t maxTemp = optCurrentForecast->days[i]->minTemperature.Celsius();
         if (settingsController.GetWeatherFormat() == Controllers::Settings::WeatherFormat::Imperial) {
-          minTemp = optCurrentForecast->days[i].maxTemperature.Fahrenheit();
-          maxTemp = optCurrentForecast->days[i].minTemperature.Fahrenheit();
+          minTemp = optCurrentForecast->days[i]->maxTemperature.Fahrenheit();
+          maxTemp = optCurrentForecast->days[i]->minTemperature.Fahrenheit();
         }
-        lv_table_set_cell_type(forecast, 2, i, TemperatureStyle(optCurrentForecast->days[i].maxTemperature));
-        lv_table_set_cell_type(forecast, 3, i, TemperatureStyle(optCurrentForecast->days[i].minTemperature));
+        lv_table_set_cell_type(forecast, 2, i, TemperatureStyle(optCurrentForecast->days[i]->maxTemperature));
+        lv_table_set_cell_type(forecast, 3, i, TemperatureStyle(optCurrentForecast->days[i]->minTemperature));
         uint8_t wday = localTime.tm_wday + i + 1;
         if (wday > 7) {
           wday -= 7;
         }
         const char* dayOfWeek = Controllers::DateTime::DayOfWeekShortToStringLow(static_cast<Controllers::DateTime::Days>(wday));
         lv_table_set_cell_value(forecast, 0, i, dayOfWeek);
-        lv_table_set_cell_value(forecast, 1, i, Symbols::GetSymbol(optCurrentForecast->days[i].iconId));
+        lv_table_set_cell_value(forecast, 1, i, Symbols::GetSymbol(optCurrentForecast->days[i]->iconId));
         // Pad cells based on the largest number of digits on each column
         char maxPadding[3] = "  ";
         char minPadding[3] = "  ";