Use a Twig extension for counting past talks

src/Opdavies/TwigExtension/OpdaviesTwigExtension.php

@@ -2,6 +2,7 @@
 
 namespace App\Opdavies\TwigExtension;
 
+use Sculpin\Contrib\ProxySourceCollection\ProxySourceItem;
 use Twig\Extension\AbstractExtension;
 use Twig\TwigFunction;
 
@@ -10,6 +11,7 @@ class OpdaviesTwigExtension extends AbstractExtension
     public function getFunctions(): array
     {
         return [
+            new TwigFunction('get_past_talk_count', [$this, 'getPastTalkCount']),
             new TwigFunction('get_years_of_experience', [$this, 'getYearsOfExperience']),
         ];
     }
@@ -19,6 +21,22 @@ class OpdaviesTwigExtension extends AbstractExtension
         return 'app.opdavies_twig_extension';
     }
 
+    public function getPastTalkCount(array $talks): int
+    {
+        $today = (new \DateTime())->getTimestamp();
+
+        return collect($talks)
+            ->flatMap(fn (ProxySourceItem $talk) => $talk->data()->get('events'))
+            ->filter(
+                function (array $event) use ($today): bool {
+                    assert(array_key_exists(array: $event, key: 'date'));
+
+                    return $event['date'] < $today;
+                }
+            )
+            ->count();
+    }
+
     public function getYearsOfExperience(): int
     {
         return (new \DateTimeImmutable())->format('Y') - 2007;