feat: enhance purchase detail handling to support cart items and improve resource structure

app/Domains/Purchase/Resources/PurchaseItemResource.php

@@ -2,12 +2,13 @@
 
 namespace App\Domains\Purchase\Resources;
 
-use App\Domains\Catalog\Resources\ProductVariantDefinitionResource;
+use App\Domains\Cart\Models\CartItem;
+use App\Domains\Purchase\Models\PurchaseItem;
 use Illuminate\Http\Request;
 use Illuminate\Http\Resources\Json\JsonResource;
 
 /**
- * @mixin \App\Domains\Purchase\Models\PurchaseItem
+ * @mixin \App\Domains\Purchase\Models\PurchaseItem|\App\Domains\Cart\Models\CartItem
  */
 class PurchaseItemResource extends JsonResource
 {
@@ -18,24 +19,90 @@ class PurchaseItemResource extends JsonResource
     {
         $variant = $this->variant;
         $product = $variant?->product;
+        $quantity = (int) ($this->cantidad ?? 0);
+        $unitPrice = $this->resolveUnitPrice();
+        $lineTotal = $this->resolveLineTotal($unitPrice, $quantity);
 
         return [
             'id' => $this->id,
-            'cantidad' => $this->cantidad,
-            'precio_unitario' => $this->formatMoney($this->precio_unitario),
-            'total' => $this->formatMoney($this->total),
+            'quantity' => $quantity,
+            'unit_price' => $this->formatMoney($unitPrice),
+            'line_total' => $this->formatMoney($lineTotal),
             'product' => $product === null ? null : [
                 'id' => $product->id,
                 'nombre' => $product->nombre,
                 'slug' => $product->slug,
+                'imagen' => $this->resolveImageUrl(),
             ],
             'variant' => $variant === null ? null : [
                 'id' => $variant->id,
-                'definitions' => ProductVariantDefinitionResource::collection($variant->definitions),
+                'attributes' => $this->resolveAttributes(),
             ],
         ];
     }
 
+    protected function resolveUnitPrice(): float
+    {
+        if ($this->resource instanceof PurchaseItem) {
+            return (float) ($this->precio_unitario ?? 0);
+        }
+
+        if ($this->resource instanceof CartItem) {
+            return (float) ($this->variant?->product?->precio ?? 0);
+        }
+
+        return 0.0;
+    }
+
+    protected function resolveLineTotal(float $unitPrice, int $quantity): float
+    {
+        if ($this->resource instanceof PurchaseItem) {
+            return (float) ($this->total ?? 0);
+        }
+
+        return $unitPrice * $quantity;
+    }
+
+    protected function resolveImageUrl(): ?string
+    {
+        $variant = $this->variant;
+
+        if ($variant === null || ! $variant->relationLoaded('attachments')) {
+            return null;
+        }
+
+        $attachment = $variant->attachments->first();
+
+        if ($attachment === null) {
+            return null;
+        }
+
+        return $attachment->getTemporaryUrl(1440);
+    }
+
+    /**
+     * @return array<int, array{name: string, value: mixed}>
+     */
+    protected function resolveAttributes(): array
+    {
+        $variant = $this->variant;
+
+        if ($variant === null || ! $variant->relationLoaded('definitions')) {
+            return [];
+        }
+
+        return $variant->definitions
+            ->map(function ($definition): array {
+                return [
+                    'name' => (string) ($definition->productAttribute?->attribute?->nombre ?? ''),
+                    'value' => $definition->value,
+                ];
+            })
+            ->filter(fn (array $attribute): bool => $attribute['name'] !== '' || $attribute['value'] !== null)
+            ->values()
+            ->all();
+    }
+
     protected function formatMoney(float|int|string|null $amount): ?string
     {
         if ($amount === null) {