feat: implement product attribute selector component and integrate into product detail page

src/app/features/store/components/product-attribute-selector/product-attribute-selector.component.html

@@ -10,10 +10,12 @@
               type="button"
               class="attribute-selector__swatch"
               [class.attribute-selector__swatch--selected]="hasSelectedOption(attribute, option)"
+              [class.attribute-selector__swatch--disabled]="!availableOptions()[attribute.id][option.id]"
               [style.background-color]="getOptionSwatchColor(option)"
               [attr.aria-label]="option.label"
               [attr.aria-pressed]="hasSelectedOption(attribute, option)"
               [title]="option.label"
+              [disabled]="!availableOptions()[attribute.id][option.id]"
               (click)="selectAttributeOption(attribute, option)"
             >
               <span class="visually-hidden">{{ option.label }}</span>
@@ -23,7 +25,9 @@
               type="button"
               class="attribute-selector__text-option"
               [class.attribute-selector__text-option--selected]="hasSelectedOption(attribute, option)"
+              [class.attribute-selector__text-option--disabled]="!availableOptions()[attribute.id][option.id]"
               [attr.aria-pressed]="hasSelectedOption(attribute, option)"
+              [disabled]="!availableOptions()[attribute.id][option.id]"
               (click)="selectAttributeOption(attribute, option)"
             >
               {{ option.label }}

src/app/features/store/components/product-attribute-selector/product-attribute-selector.component.scss

@@ -45,6 +45,12 @@
         0 0 0 2px rgba(255, 255, 255, 1),
         0 0 0 3px var(--tenant-primary);
     }
+
+    &--disabled {
+      opacity: 0.3;
+      cursor: not-allowed;
+      pointer-events: none;
+    }
   }
 
   &__text-option {
@@ -65,5 +71,13 @@
       border-color: var(--tenant-primary);
       color: #ffffff;
     }
+
+    &--disabled {
+      opacity: 0.4;
+      cursor: not-allowed;
+      background-color: #f9f9f9;
+      color: #b0b0b0;
+      pointer-events: none;
+    }
   }
 }

src/app/features/store/components/product-attribute-selector/product-attribute-selector.component.ts

@@ -1,6 +1,7 @@
 import {
   ChangeDetectionStrategy,
   Component,
+  computed,
   effect,
   input,
   output,
@@ -32,6 +33,50 @@ export class ProductAttributeSelectorComponent {
 
   protected readonly selectedAttributeOptions = signal<Record<number, number>>({});
 
+  protected readonly availableOptions = computed(() => {
+    const selections = this.selectedAttributeOptions();
+    const variants = this.variantsMap();
+    const attributes = this.attributes();
+
+    const availability: Record<number, Record<number, boolean>> = {};
+
+    for (const attribute of attributes) {
+      availability[attribute.id] = {};
+      for (const option of attribute.options) {
+        const optionNormalized = this.normalizeText(option.value || option.label);
+        
+        const isAvailable = variants.some(variant => {
+          if (variant.stock <= 0) return false;
+
+          const variantAttrValue = this.getDefaultVariantAttributeValue(attribute, variant.attributes);
+          if (!variantAttrValue || this.normalizeText(variantAttrValue) !== optionNormalized) {
+             return false;
+          }
+
+          for (const otherAttr of attributes) {
+             if (otherAttr.id === attribute.id) continue;
+             const selectedOptionId = selections[otherAttr.id];
+             if (selectedOptionId !== undefined) {
+                const selectedOption = otherAttr.options.find(o => o.id === selectedOptionId);
+                if (selectedOption) {
+                   const selectedNormalized = this.normalizeText(selectedOption.value || selectedOption.label);
+                   const vAttrValue = this.getDefaultVariantAttributeValue(otherAttr, variant.attributes);
+                   if (!vAttrValue || this.normalizeText(vAttrValue) !== selectedNormalized) {
+                      return false;
+                   }
+                }
+             }
+          }
+          return true;
+        });
+
+        availability[attribute.id][option.id] = isAvailable;
+      }
+    }
+
+    return availability;
+  });
+
   constructor() {
     effect(() => {
       const attributes = this.attributes();

src/app/features/store/pages/product-detail-page/product-detail-page.component.html

@@ -69,6 +69,7 @@
                     type="button"
                     class="product-detail__quantity-button"
                     aria-label="Aumentar cantidad"
+                    [disabled]="quantity() >= (selectedVariant()?.stock ?? 1)"
                     (click)="increaseQuantity()"
                   >
                     +
@@ -80,11 +81,12 @@
                     class="product-detail__cta"
                     variant="secondary"
                     type="button"
+                    [disabled]="!selectedVariant()"
                   >
                     Agregar al carrito
                   </app-button>
 
-                  <app-button class="product-detail__cta" type="button">
+                  <app-button class="product-detail__cta" type="button" [disabled]="!selectedVariant()">
                     Comprar
                   </app-button>
                 </div>

src/app/features/store/pages/product-detail-page/product-detail-page.component.ts

@@ -154,10 +154,14 @@ export class ProductDetailPageComponent implements OnInit, OnDestroy {
 
   protected onVariantChange(variant: ProductVariantMap | null): void {
     this.selectedVariant.set(variant);
+    if (variant && this.quantity() > variant.stock) {
+      this.quantity.set(Math.max(1, variant.stock));
+    }
   }
 
   protected increaseQuantity(): void {
-    this.quantity.update((current) => current + 1);
+    const currentStock = this.selectedVariant()?.stock ?? 1;
+    this.quantity.update((current) => current < currentStock ? current + 1 : current);
   }
 
   protected decreaseQuantity(): void {