// src/admin/lib/client.ts
import Medusa from "@medusajs/js-sdk"

export const sdk = new Medusa({
  baseUrl: import.meta.env.VITE_BACKEND_URL || "/",
  debug: import.meta.env.DEV,
  auth: {
    type: "session",
  },
})

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**npm/yarn users:** DO NOT install these packages - already available.

// ✅ CORRECT - Separate queries with proper responsibilities
const RelatedProductsWidget = ({ data: product }) => {
  const [modalOpen, setModalOpen] = useState(false)

  // Display query - loads on mount
  const { data: displayProducts } = useQuery({
    queryFn: () => fetchSelectedProducts(selectedIds),
    queryKey: ["related-products-display", product.id],
    // No 'enabled' condition - loads immediately
  })

  // Modal query - loads when needed
  const { data: modalProducts } = useQuery({
    queryFn: () => sdk.admin.product.list({ limit: 10, offset: 0 }),
    queryKey: ["products-selection"],
    enabled: modalOpen, // OK for modal-only data
  })

  // Mutation with proper invalidation
  const updateProduct = useMutation({
    mutationFn: updateFunction,
    onSuccess: () => {
      // Invalidate display data query to refresh UI
      queryClient.invalidateQueries({ queryKey: ["related-products-display", product.id] })
      // Also invalidate the entity query
      queryClient.invalidateQueries({ queryKey: ["product", product.id] })
      // Note: No need to invalidate modal selection query
    },
  })

  return (
    <Container>
      {/* Display uses displayProducts */}
      {displayProducts?.map(p => <div key={p.id}>{p.title}</div>)}

      <FocusModal open={modalOpen} onOpenChange={setModalOpen}>
        {/* Modal uses modalProducts */}
      </FocusModal>
    </Container>
  )
}

// ❌ WRONG - Single query with conditional loading
const BrokenWidget = ({ data: product }) => {
  const [modalOpen, setModalOpen] = useState(false)

  const { data } = useQuery({
    queryFn: () => sdk.admin.product.list(),
    enabled: modalOpen, // ❌ Display breaks on page refresh!
  })

  // Trying to display from modal query
  const displayItems = data?.filter(item => ids.includes(item.id)) // No data until modal opens

  return <div>{displayItems?.map(...)}</div> // Empty on mount!
}

references/data-loading.md       - useQuery/useMutation patterns, cache invalidation
references/forms.md              - FocusModal/Drawer patterns, validation
references/table-selection.md    - Complete DataTable selection pattern
references/display-patterns.md   - Lists, tables, cards for entities
references/typography.md         - Text component patterns
references/navigation.md         - Link, useNavigate, useParams patterns

// Fetch from custom backend route
const { data } = useQuery({
  queryKey: ["reviews", product.id],
  queryFn: () => sdk.client.fetch(`/admin/products/${product.id}/reviews`),
})

// Mutation to custom backend route
const createReview = useMutation({
  mutationFn: (data) => sdk.client.fetch("/admin/reviews", {
    method: "POST",
    body: data
  }),
  onSuccess: () => {
    queryClient.invalidateQueries({ queryKey: ["reviews", product.id] })
    toast.success("Review created")
  },
})

// src/admin/widgets/custom-widget.tsx
import { defineWidgetConfig } from "@medusajs/admin-sdk"
import { DetailWidgetProps } from "@medusajs/framework/types"

const MyWidget = ({ data }: DetailWidgetProps<HttpTypes.AdminProduct>) => {
  return <Container>Widget content</Container>
}

export const config = defineWidgetConfig({
  zone: "product.details.after",
})

export default MyWidget

// src/admin/routes/custom-page/page.tsx
import { defineRouteConfig } from "@medusajs/admin-sdk"

const CustomPage = () => {
  return <div>Page content</div>
}

export const config = defineRouteConfig({
  label: "Custom Page",
})

export default CustomPage

npm run dev      # or pnpm dev / yarn dev

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