feat: add public product catalog boundary

apps/api/src/modules/products/repositories/product-repository.js

@@ -1,6 +1,10 @@
-import { and, asc, eq } from 'drizzle-orm';
+import { and, asc, eq, inArray } from 'drizzle-orm';
 
-import { products } from '../../../infrastructure/database/schema.js';
+import {
+  inventoryItems,
+  listings,
+  products,
+} from '../../../infrastructure/database/schema.js';
 
 export function createProductRepository(db) {
   return {
@@ -18,6 +22,22 @@ export function createProductRepository(db) {
       return product ?? null;
     },
 
+    async findPublicBySlug(slug) {
+      const [result] = await db
+        .select({ product: products })
+        .from(products)
+        .innerJoin(inventoryItems, eq(inventoryItems.productId, products.id))
+        .innerJoin(listings, eq(listings.inventoryItemId, inventoryItems.id))
+        .where(and(
+          eq(products.slug, slug),
+          eq(inventoryItems.status, 'ACTIVE'),
+          inArray(listings.status, ['AVAILABLE', 'PENDING']),
+        ))
+        .limit(1);
+
+      return result?.product ?? null;
+    },
+
     async findBySellerIdAndSlug(sellerId, slug) {
       const [product] = await db
         .select()

apps/api/src/modules/products/routes/public-product-routes.js

@@ -0,0 +1,10 @@
+import { toPublicProductDto } from '@pokemon-inventory/contracts/public-product';
+
+export async function registerPublicProductRoutes(app, options) {
+  const { publicProductService } = options;
+
+  app.get('/public/products/:slug', async (request) => {
+    const product = await publicProductService.getBySlug(request.params.slug);
+    return { data: toPublicProductDto(product) };
+  });
+}

apps/api/src/modules/products/services/public-product-service.js

@@ -0,0 +1,15 @@
+import { createApplicationError } from '../../../shared/errors/application-error.js';
+
+export function createPublicProductService({ productRepository }) {
+  return {
+    async getBySlug(slug) {
+      const product = await productRepository.findPublicBySlug(slug);
+
+      if (!product) {
+        throw createApplicationError('PRODUCT_NOT_FOUND', 'Product was not found.', 404);
+      }
+
+      return product;
+    },
+  };
+}