feat: change price by product variation

app/product/[name]/page.tsx

@@ -100,7 +100,7 @@ export default async function ProductPage(props: { params: Promise<{ name: strin
               </Suspense>
             )}
             <Suspense fallback={null}>
-              <ProductDescription product={product} />
+              <ProductDescription product={product} variations={variations} />
             </Suspense>
             <AddToCart product={product} variations={variations}/>
           </div>

components/cart/add-to-cart.tsx

@@ -4,7 +4,6 @@ import { PlusIcon } from '@heroicons/react/24/outline';
 import clsx from 'clsx';
 import { useProduct } from 'components/product/product-context';
 import { Product, ProductVariations } from 'lib/woocomerce/models/product';
-import { useMemo } from 'react';
 import { useCart } from './cart-context';
 
 function SubmitButton({disabled = false}: {disabled: boolean}) {
@@ -24,20 +23,8 @@ function SubmitButton({disabled = false}: {disabled: boolean}) {
 export function AddToCart({ product, variations }: { product: Product, variations?: ProductVariations[] }) {
   const { setNewCart } = useCart();
   const { state } = useProduct();
-  
+  const productVariant = variations?.find((variation) => variation.id.toString() === state.variation);
-
+  const variation = productVariant?.attributes.map((attr) => ({ attribute: attr.name, value: attr.option })) || [];
-  const productVariant = useMemo(() => {
-    const keys = Object.keys(state).filter((key) => key !== 'id' && key !== 'image').map((key) => ({
-      attribute: key.toLowerCase(),
-      value: state[key]
-    }));
-    const productExist = variations?.find((variation) => {
-      const attributes = variation.attributes.map((attr) => ({name: attr.name, option: attr.option})) || [];
-      return attributes.every((attribute) => attribute.option === keys.find((key) => key.attribute === attribute.name)?.value);
-    });
-
-    return productExist ? keys : [];
-  }, [state, variations]);
   
   return (
     <form
@@ -46,7 +33,7 @@ export function AddToCart({ product, variations }: { product: Product, variation
           const cart = await (
             await fetch('/api/cart', {
               method: 'POST',
-              body: JSON.stringify({ id: product.id, quantity: 1, variation: productVariant })
+              body: JSON.stringify({ id: product.id, quantity: 1, variation })
             })
           ).json();
           setNewCart(cart);
@@ -55,7 +42,7 @@ export function AddToCart({ product, variations }: { product: Product, variation
         }
       }}
     >
-      <SubmitButton disabled={variations?.length && !productVariant.length ? true : false}/>
+      <SubmitButton disabled={variations?.length && !product ? true : false}/>
     </form>
   );
 }

components/product/product-context.tsx

@@ -7,12 +7,15 @@ type ProductState = {
   [key: string]: string;
 } & {
   image?: string;
-};
+} & {
+  variation?: string;
+}
 
 type ProductContextType = {
   state: ProductState;
   updateOption: (name: string, value: string) => ProductState;
   updateImage: (index: string) => ProductState;
+  updateVariation: (variation: string) => ProductState;
 };
 
 const ProductContext = createContext<ProductContextType | undefined>(undefined);
@@ -48,11 +51,18 @@ export function ProductProvider({ children }: { children: React.ReactNode }) {
     return { ...state, ...newState };
   };
 
+  const updateVariation = (variation: string) => {
+    const newState = { variation };
+    setOptimisticState(newState);
+    return { ...state, ...newState };
+  }
+
   const value = useMemo(
     () => ({
       state,
       updateOption,
       updateImage,
+      updateVariation
     }),
     [state]
   );

components/product/product-description.tsx

@@ -1,14 +1,19 @@
+'use client';
 import Price from 'components/price';
 import Prose from 'components/prose';
-import { Product } from 'lib/woocomerce/models/product';
+import { Product, ProductVariations } from 'lib/woocomerce/models/product';
+import { useProduct } from './product-context';
+
+export function ProductDescription({ product, variations }: { product: Product, variations?: ProductVariations[] }) {
+  const { state } = useProduct();
+  const productVariant = variations?.find((variation) => variation.id.toString() === state.variation);
   
-export function ProductDescription({ product }: { product: Product }) {
   return (
     <>
       <div className="mb-6 flex flex-col border-b pb-6 dark:border-neutral-700">
         <h1 className="mb-2 text-5xl font-medium">{product.name}</h1>
         <div className="mr-auto w-auto rounded-full bg-blue-600 p-2 text-sm text-white">
-          <Price amount={product.price} currencyCode="EUR" />
+          <Price amount={productVariant ? productVariant.price : product.price} currencyCode="EUR" />
         </div>
       </div>
       {product.description ? (

components/product/variant-selector.tsx

@@ -35,12 +35,19 @@ export function VariantSelector({
             const optionNameLowerCase = option?.name?.toLowerCase();
             // The option is active if it's in the selected options.
             const isActive = optionNameLowerCase ? state[optionNameLowerCase] === value : false;
-            if (!optionNameLowerCase) return null;
 
             return (
               <button
                 formAction={() => {
-                  const newState = updateOption(optionNameLowerCase, value);
+                  if (!optionNameLowerCase) return;
+                  let newState = updateOption(optionNameLowerCase, value);
+                  const keys = Object.keys(newState).filter((key) => key !== 'id' && key !== 'image' && key !== 'variation');
+                  const variant = variations.find((variation) => {
+                    return variation?.attributes?.every((attr) => attr.name && keys.includes(attr.name) && newState[attr.name] === attr.option);
+                  })?.id?.toString();
+                  if (variant) {
+                    newState = {...newState, variation: variant};
+                  }
                   updateURL(newState);
                 }}
                 key={value}