Can I vibe code Rep AI?

Build a complete, standalone E-Commerce AI Sales and Support Chat system for Shopify using Next.js (App Router), TypeScript, Tailwind CSS, Vercel AI SDK, and PostgreSQL with pgvector.

CORE ARCHITECTURE & DATA MODEL:
1. Database Schema (Prisma/Drizzle):
   - Stores: store_domain, shopify_access_token, tone_of_voice, operational_policies.
   - Catalog: product_id, title, handle, description, price, tags, inventory_quantity, embedding (vector 1536).
   - Sessions: session_id, store_id, customer_email, cart_id, page_history (JSON), created_at.
   - Messages: id, session_id, role (user/assistant/system), content, tool_calls (JSON), created_at.
   - Orders (cached): order_id, shopify_order_number, email, status, tracking_url, fulfillment_status, line_items (JSON).

2. SHOPIFY INTEGRATIONS & TOOLS (Function Calling):
   Implement Vercel AI SDK tools that the LLM can trigger dynamically:
   - search_catalog(query: string, max_price?: number): Performs hybrid vector search (pgvector) + keyword search over product catalog embeddings.
   - get_order_status(order_number: string, email: string): Queries Shopify Admin GraphQL API (`orders` query) to return tracking links, fulfillment state, and estimated delivery dates.
   - modify_cart(cart_id: string, variant_id: string, quantity: number): Calls Shopify Storefront API (`cartLinesAdd` / `cartLinesUpdate`) to add upsell items directly to the user's active session cart.
   - trigger_return_request(order_id: string, item_ids: string[], reason: string): Calls Shopify Return API (`returnCreate`) to generate a return authorization and return shipping label link.

3. EMBEDDED CHAT WIDGET (Client-side JS):
   - Build an embeddable script bundle (`widget.js`) hostable on CDN.
   - Floating widget bubble bottom-right with custom brand primary color support.
   - Collect client signals: path changes, cart total, idle time.
   - Proactive trigger logic: If user visits cart page with total > $50 and stays idle for 15 seconds, trigger proactive greeting: "Need help choosing an accessory before checkout?".
   - Stream responses token-by-token using ReadableStream. Render rich UI components inside chat: Product Cards with "Add to Cart" button, Order Tracking status bars, and Discount badge callouts.

4. ADMIN DASHBOARD:
   - Shopify App Admin built with Shopify Polaris UI.
   - Catalog Sync Engine: Webhooks (`products/create`, `products/update`, `products/delete`) to keep embeddings up to date in real time.
   - Conversation Logs viewer showing human vs AI auto-resolutions.
   - Tone & Policy Configuration: Input system prompts for custom brand voice, refund rules, and free shipping thresholds.

EXPLICITLY OUT OF SCOPE:
- Multi-channel integrations (WhatsApp, Instagram, TikTok DMs). Focus purely on web storefront chat.
- Live human video calling.
- Deep research & AI video generation.

TECHNICAL CONSTRAINTS & PROMPT SAFEGUARDS:
- Implement system prompt constraints preventing the AI from negotiating prices or granting discounts greater than a configurable store ceiling (e.g., max 10% auto-discount).
- Sanitize all user inputs before vector search and LLM context injection. Ensure function responses mask PII except for verified order emails.

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