cleanup SouthAfrica

src/Countries/SouthAfrica.php

@@ -4,6 +4,7 @@
 
 use Carbon\CarbonImmutable;
 
+use Carbon\CarbonInterface;
 use function in_array;
 
 class SouthAfrica extends Country
@@ -31,16 +32,10 @@ protected function allHolidays(int $year): array
         ];
 
         foreach ($holidays as $name => $date) {
-            $holidayDate = CarbonImmutable::createFromFormat('Y-m-d', "{$year}-{$date}");
-            assert($holidayDate instanceof CarbonImmutable);
-
-            // The Public Holidays Act (Act No 36 of 1994) states that whenever a public holiday falls on a Sunday, the Monday following it will be a public holiday.
-            // https://www.gov.za/documents/public-holidays-act
-            if (
-                $holidayDate->isSunday() &&
-                ! in_array($holidayDate->addDay()->format('m-d'), $holidays, true) // Check that the Monday is not already a holiday
-            ) {
-                $holidays[$name.' Observed'] = $holidayDate->addDay();
+            $observedDay = $this->observed($date, $year);
+
+            if ($observedDay) {
+                $holidays[$name . ' Observed'] = $observedDay;
             }
         }
 
@@ -57,4 +52,16 @@ protected function variableHolidays(int $year): array
             'Family Day' => $easter->addDay(),
         ];
     }
+
+    protected function observed(string $date, int $year): ?CarbonInterface
+    {
+        $holiday = CarbonImmutable::createFromFormat('Y-m-d', "{$year}-{$date}")->startOfDay();
+
+        // https://www.gov.za/documents/public-holidays-act
+        if ($holiday->isSunday()) {
+            return $holiday->next('monday');
+        }
+
+        return null;
+    }
 }