Refactor notification event payloads and listener naming

app/Actions/Notifications/TicketStatusChangedPayload.php

@@ -4,15 +4,12 @@ namespace App\Actions\Notifications;
 
 use App\Enums\NotificationEventType;
 use Carbon\CarbonImmutable;
-use Illuminate\Contracts\Support\Arrayable;
 
-/**
- * @implements Arrayable<string, mixed>
- */
-final readonly class TicketStatusChangedPayload implements Arrayable
+final readonly class TicketStatusChangedPayload implements NotificationEventPayload
 {
+    public NotificationEventType $eventType;
+
     public function __construct(
-        public NotificationEventType $eventType,
         public int $projectId,
         public string $projectKey,
         public string $projectName,
@@ -22,12 +19,51 @@ final readonly class TicketStatusChangedPayload implements Arrayable
         public string $ticketUrl,
         public ?int $actorId,
         public ?string $actorName,
-        public ?int $fromStatusId,
-        public ?string $fromStatusLabel,
+        public int $fromStatusId,
+        public string $fromStatusLabel,
         public int $toStatusId,
         public string $toStatusLabel,
         public CarbonImmutable $occurredAt,
-    ) {}
+    ) {
+        $this->eventType = NotificationEventType::TicketStatusChanged;
+    }
+
+    public function eventType(): NotificationEventType
+    {
+        return $this->eventType;
+    }
+
+    public function projectId(): int
+    {
+        return $this->projectId;
+    }
+
+    /**
+     * @return array<string, scalar|null>
+     */
+    public function deliveryMetadata(): array
+    {
+        return [
+            'project_key' => $this->projectKey,
+            'ticket_key' => $this->ticketKey,
+        ];
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    public function discordTemplateVariables(): array
+    {
+        return [
+            '$url' => $this->ticketUrl,
+            '$ticket_key' => $this->ticketKey,
+            '$ticket_title' => $this->ticketTitle,
+            '$project_name' => $this->projectName,
+            '$status_from' => $this->fromStatusLabel,
+            '$status_to' => $this->toStatusLabel,
+            '$actor_name' => $this->actorName ?? '',
+        ];
+    }
 
     /**
      * @return array{
@@ -35,7 +71,7 @@ final readonly class TicketStatusChangedPayload implements Arrayable
      *     project: array{id: int, key: string, name: string},
      *     ticket: array{id: int, key: string, title: string},
      *     actor: array{id: int, name: string}|null,
-     *     from: array{id: int, label: string}|null,
+     *     from: array{id: int, label: string},
      *     to: array{id: int, label: string},
      *     ticket_url: string,
      *     occurred_at: string
@@ -61,12 +97,10 @@ final readonly class TicketStatusChangedPayload implements Arrayable
                     'id' => $this->actorId,
                     'name' => $this->actorName,
                 ],
-            'from' => $this->fromStatusId === null || $this->fromStatusLabel === null
-                ? null
-                : [
-                    'id' => $this->fromStatusId,
-                    'label' => $this->fromStatusLabel,
-                ],
+            'from' => [
+                'id' => $this->fromStatusId,
+                'label' => $this->fromStatusLabel,
+            ],
             'to' => [
                 'id' => $this->toStatusId,
                 'label' => $this->toStatusLabel,