feat: implement variant selection in cart and product components for enhanced user experience

src/app/shared/components/cart-item/cart-item.component.ts

@@ -1,6 +1,10 @@
 import { ChangeDetectionStrategy, Component, computed, input, output } from '@angular/core';
 import { QuantitySelectorComponent } from '../quantity-selector/quantity-selector.component';
 import { IconButtonComponent } from '../icon-button/icon-button.component';
+import {
+  VariantSelectorComponent,
+  VariantSelectorVariant,
+} from '../variant-selector/variant-selector.component';
 
 export interface CartItemAttribute {
   label: string;
@@ -10,10 +14,10 @@ export interface CartItemAttribute {
 @Component({
   selector: 'app-cart-item',
   standalone: true,
-  imports: [QuantitySelectorComponent, IconButtonComponent],
+  imports: [QuantitySelectorComponent, IconButtonComponent, VariantSelectorComponent],
   templateUrl: './cart-item.component.html',
   styleUrl: './cart-item.component.scss',
-  changeDetection: ChangeDetectionStrategy.OnPush
+  changeDetection: ChangeDetectionStrategy.OnPush,
 })
 export class CartItemComponent {
   readonly imageUrl = input<string | null>(null);
@@ -22,6 +26,8 @@ export class CartItemComponent {
   readonly discountedPrice = input<number>(0);
   readonly discountPercentage = input<number | null>(null);
   readonly attributes = input<CartItemAttribute[]>([]);
+  readonly variants = input<VariantSelectorVariant[]>([]);
+  readonly selectedVariant = input<unknown>(null);
   readonly quantity = input<number>(1);
   readonly readonly = input<boolean>(false);
   readonly quantityDisabled = input<boolean>(false);
@@ -31,6 +37,11 @@ export class CartItemComponent {
   readonly remove = output<void>();
   readonly increase = output<void>();
   readonly decrease = output<void>();
+  readonly variantChange = output<number>();
+
+  protected readonly hasVariantSelectors = computed(() =>
+    this.variants().some((variant) => Object.keys(variant.values).length > 0),
+  );
 
   protected onQuantityChange(newQuantity: number): void {
     if (this.quantityDisabled()) return;
@@ -49,12 +60,20 @@ export class CartItemComponent {
     this.decrease.emit();
   }
 
+  protected onVariantChange(variant: unknown): void {
+    if (!this.quantityDisabled() && typeof variant === 'number') {
+      this.variantChange.emit(variant);
+    }
+  }
+
   protected readonly formattedOriginalPrice = computed(() => {
     const price = this.originalPrice();
     return price === null ? null : this.formatCurrency(price);
   });
 
-  protected readonly formattedDiscountedPrice = computed(() => this.formatCurrency(this.discountedPrice()));
+  protected readonly formattedDiscountedPrice = computed(() =>
+    this.formatCurrency(this.discountedPrice()),
+  );
 
   private formatCurrency(value: number): string {
     const rounded = Math.round(value);