Can I vibe code Monk AI?

Build a custom Shopify app to replace Monk AI upsell functions using Remix, Shopify App Bridge, Checkout UI Extensions, and the Post-Purchase API.

1. DATA STRUCTURES:
- Create a Prisma database schema for storing UpsellRules: id, status (active/inactive), triggerType (cart_total, product_present, collection_present), triggerValue (string/number), offerVariantId (Shopify GraphQL ID), discountPercentage (number), offerType (checkout_bump, post_purchase, cart_drawer).
- Store rule precedence as an integer priority field.

2. CHECKOUT UI EXTENSION (React / TSX):
- Target: `purchase.checkout.block.render`.
- Fetch active Checkout Bump rules via Shopify Admin GraphQL Metafields or app backend proxy endpoint.
- Evaluate cart line items using `useCartLines()` and cart subtotal using `useSubtotalAmount()`.
- Render a checkbox block showing the offer title, image, and discounted price.
- On click, invoke `applyCartLinesChange` mutation to add the variant directly to the checkout session.

3. POST-PURCHASE EXTENSION (JS / TS):
- Target: `shouldRender` and `render`.
- In `shouldRender`, query order items and determine if an active post-purchase rule applies. Return `{ render: true }` if matched.
- In `render`, display product card with accept/decline buttons.
- On accept, execute `calculateChangeset` and call `acceptOffer` using the signed token to adjust the existing order payment payload without re-prompting for payment.

4. ERROR HANDLING AND CONSTRAINTS:
- Ensure execution times remain under 100ms by caching rules using Shopify Metafields.
- Handle out-of-stock offer variants gracefully by failing silently (do not block standard checkout).
- Check for existing line items to prevent duplicate additions if the target variant is already in the cart.

5. OUT OF SCOPE:
- Complex visual drag-and-drop rule builders; hardcode schema parsing or use simple Remix forms.
- Email/SMS integrations.
- Multi-merchant SaaS billing logic.

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