feat(catalog): model availability as global decisions

app/Domains/Catalog/Services/AvailabilityDecision.php

@@ -0,0 +1,63 @@
+<?php
+
+namespace App\Domains\Catalog\Services;
+
+use App\Domains\Catalog\Enums\CatalogAction;
+
+final readonly class AvailabilityDecision
+{
+    /**
+     * @param  list<CatalogAction>  $allowedActions
+     * @param  list<array{code: string, message: string}>  $reasons
+     */
+    private function __construct(
+        private bool $visible,
+        private ?int $maximumQuantity,
+        private array $allowedActions,
+        private array $reasons,
+    ) {}
+
+    /** @param list<array{code: string, message: string}> $reasons */
+    public static function hidden(array $reasons): self
+    {
+        return new self(false, null, [], $reasons);
+    }
+
+    /**
+     * @param  list<CatalogAction>  $allowedActions
+     * @param  list<array{code: string, message: string}>  $reasons
+     */
+    public static function visible(
+        ?int $maximumQuantity,
+        array $allowedActions,
+        array $reasons,
+    ): self {
+        return new self(true, $maximumQuantity, $allowedActions, $reasons);
+    }
+
+    public function isVisible(): bool
+    {
+        return $this->visible;
+    }
+
+    /** @return array<string, mixed> */
+    public function toArray(): array
+    {
+        if (! $this->visible) {
+            return [
+                'state' => 'hidden',
+                'reasons' => $this->reasons,
+            ];
+        }
+
+        return [
+            'state' => 'visible',
+            'maximum_quantity' => $this->maximumQuantity,
+            'allowed_actions' => array_map(
+                fn (CatalogAction $action): string => $action->value,
+                $this->allowedActions,
+            ),
+            'reasons' => $this->reasons,
+        ];
+    }
+}