Fix negative timer formatting (#359)

GameEngine/Generator.php

@@ -124,24 +124,12 @@ class MyGenerator
 	 */
 	public function getTimeFormat($time)
 	{
-     $time = (int) $time;
+		$time = max(0, (int) $time);
-		$min = 0;
+		$hr = intdiv($time, 3600);
-		$hr = 0;
+		$min = intdiv($time % 3600, 60);
+		$seconds = $time % 60;
 
-		while ($time >= 60) {
+		return sprintf('%d:%02d:%02d', $hr, $min, $seconds);
-			$time -= 60;
-			$min++;
-		}
-
-		while ($min >= 60) {
-			$min -= 60;
-			$hr++;
-		}
-
-		if ($min < 10) $min = "0" . $min;
-		if ($time < 10) $time = "0" . $time;
-
-		return $hr . ":" . $min . ":" . $time;
 	}
 
 	/**

tests/regression/GetTimeFormatTest.php

@@ -0,0 +1,31 @@
+<?php
+
+require_once __DIR__ . '/../../GameEngine/Generator.php';
+
+$cases = [
+    -61 => '0:00:00',
+    -1 => '0:00:00',
+    0 => '0:00:00',
+    1 => '0:00:01',
+    59 => '0:00:59',
+    60 => '0:01:00',
+    3599 => '0:59:59',
+    3600 => '1:00:00',
+    86399 => '23:59:59',
+    86400 => '24:00:00',
+    90000 => '25:00:00',
+];
+
+foreach ($cases as $seconds => $expected) {
+    $actual = $generator->getTimeFormat($seconds);
+
+    if ($actual !== $expected) {
+        fwrite(
+            STDERR,
+            "getTimeFormat($seconds): expected $expected, got $actual.\n"
+        );
+        exit(1);
+    }
+}
+
+fwrite(STDOUT, "getTimeFormat regression test passed.\n");