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# CartSnitch Frontend
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## Project Context
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CartSnitch is a self-hosted grocery price intelligence platform built as a polyrepo microservices architecture. This repo (`cartsnitch/cartsnitch`) is the mobile-first Progressive Web App — the flagship repo and primary user interface.
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**GitHub org:** github.com/cartsnitch
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**Domain:** cartsnitch.com
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### CartSnitch Services
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| Repo | Service | Purpose |
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|------|---------|---------|
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| `cartsnitch/common` | — | Shared models, schemas, utilities |
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| `cartsnitch/receiptwitness` | ReceiptWitness | Purchase data ingestion via retailer scrapers |
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| `cartsnitch/api` | API Gateway | Frontend-facing REST API |
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| `cartsnitch/cartsnitch` | Frontend | React PWA, mobile-first (this repo) |
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| `cartsnitch/stickershock` | StickerShock | Price increase detection & CPI comparison |
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| `cartsnitch/shrinkray` | ShrinkRay | Shrinkflation monitoring |
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| `cartsnitch/clipartist` | ClipArtist | Coupon/deal watching & shopping optimization |
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| `cartsnitch/infra` | — | K8s manifests, Flux kustomizations |
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## What This App Does
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The frontend is a mobile-first PWA that serves as the primary user interface for CartSnitch. Users interact with it to:
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1. **Connect store accounts** — link their Meijer, Kroger, Target loyalty accounts
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2. **View purchase history** — see all purchases across stores in one timeline
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3. **Browse products** — search the normalized product catalog
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4. **Track prices** — view per-item price charts across stores over time
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5. **Get alerts** — see price increase and shrinkflation notifications
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6. **View coupons/deals** — browse active coupons relevant to their shopping
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7. **Generate optimized shopping lists** — input what they need, get a store-split plan with coupon instructions
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8. **Public dashboards** — shareable price transparency views (store comparisons, inflation tracking)
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## Tech Stack
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- React 18+ (or Next.js if SSR/SSG is valuable for public pages)
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- TypeScript
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- Tailwind CSS (mobile-first responsive design)
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- Workbox (service worker, offline caching, PWA manifest)
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- Recharts or Chart.js (price trend visualizations)
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- TanStack Query (React Query) for data fetching and caching
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- React Router (client-side routing)
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- Zustand or Jotai (lightweight state management)
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- Vite (build tool)
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## Repo Structure
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```
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frontend/
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├── CLAUDE.md
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├── README.md
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├── package.json
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├── tsconfig.json
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├── vite.config.ts
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├── tailwind.config.ts
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├── Dockerfile # Multi-stage: build + nginx serve
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├── docker-compose.yml # Local dev
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├── public/
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│ ├── manifest.json # PWA manifest
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│ ├── sw.js # Service worker (Workbox generated)
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│ ├── icons/ # PWA icons (192, 512, maskable)
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│ └── favicon.ico
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├── src/
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│ ├── main.tsx
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│ ├── App.tsx
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│ ├── api/
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│ │ ├── client.ts # Axios/fetch wrapper, JWT interceptor
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│ │ ├── auth.ts # Auth API calls
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│ │ ├── purchases.ts
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│ │ ├── products.ts
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│ │ ├── prices.ts
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│ │ ├── coupons.ts
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│ │ ├── shopping.ts
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│ │ └── alerts.ts
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│ ├── hooks/
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│ │ ├── useAuth.ts
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│ │ ├── usePurchases.ts
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│ │ ├── useProducts.ts
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│ │ ├── usePrices.ts
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│ │ └── useAlerts.ts
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│ ├── pages/
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│ │ ├── Login.tsx
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│ │ ├── Register.tsx
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│ │ ├── Dashboard.tsx # Home — summary, recent purchases, alerts
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│ │ ├── Purchases.tsx # Purchase history timeline
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│ │ ├── PurchaseDetail.tsx # Single receipt view
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│ │ ├── Products.tsx # Product catalog / search
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│ │ ├── ProductDetail.tsx # Product with cross-store price chart
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│ │ ├── Prices.tsx # Price trends overview
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│ │ ├── Coupons.tsx # Active deals
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│ │ ├── ShoppingList.tsx # Optimized shopping list builder
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│ │ ├── Alerts.tsx # Price increase / shrinkflation alerts
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│ │ ├── StoreAccounts.tsx # Manage connected stores
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│ │ ├── Settings.tsx
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│ │ └── public/
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│ │ ├── PriceTrends.tsx # Public shareable price dashboards
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│ │ └── StoreComparison.tsx
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│ ├── components/
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│ │ ├── layout/
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│ │ │ ├── AppShell.tsx # Mobile nav, header, bottom tabs
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│ │ │ ├── BottomNav.tsx
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│ │ │ └── Header.tsx
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│ │ ├── charts/
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│ │ │ ├── PriceHistoryChart.tsx
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│ │ │ ├── SpendingChart.tsx
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│ │ │ └── InflationComparisonChart.tsx
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│ │ ├── purchases/
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│ │ │ ├── PurchaseCard.tsx
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│ │ │ └── PurchaseItemRow.tsx
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│ │ ├── products/
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│ │ │ ├── ProductCard.tsx
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│ │ │ └── StorePriceComparison.tsx
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│ │ ├── coupons/
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│ │ │ └── CouponCard.tsx
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│ │ ├── shopping/
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│ │ │ ├── ShoppingListEditor.tsx
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│ │ │ └── OptimizedPlan.tsx
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│ │ ├── alerts/
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│ │ │ ├── PriceAlertCard.tsx
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│ │ │ └── ShrinkflationCard.tsx
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│ │ └── common/
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│ │ ├── LoadingSpinner.tsx
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│ │ ├── EmptyState.tsx
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│ │ ├── StoreLogo.tsx
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│ │ └── ErrorBoundary.tsx
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│ ├── stores/ # Zustand/Jotai state stores
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│ │ ├── authStore.ts
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│ │ └── uiStore.ts
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│ ├── utils/
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│ │ ├── formatCurrency.ts
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│ │ ├── formatDate.ts
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│ │ └── storeSlugs.ts
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│ └── types/
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│ ├── purchase.ts
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│ ├── product.ts
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│ ├── price.ts
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│ ├── coupon.ts
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│ └── alert.ts
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└── tests/
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└── ...
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```
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## Design Principles
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- **Mobile-first.** Primary use case is checking prices and managing lists on a phone in-store or on the couch. Design for 375px viewport first, scale up.
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- **Fast and offline-capable.** Service worker caches the app shell and recent data. Users should be able to browse their purchase history and shopping lists offline.
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- **Minimal, opinionated UI.** This isn't a generic dashboard. Every screen should answer a specific question: "What did I buy?" "Where should I buy this?" "Am I getting ripped off?"
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- **Store branding.** Use each retailer's brand colors for visual differentiation (Meijer red, Kroger blue, Target red — careful with the two reds, differentiate with icons/logos).
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- **Charts that tell a story.** Price history charts should make it immediately obvious when a price spiked. Annotations for "coupon available" or "inflation baseline" add context.
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## PWA Requirements
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- `manifest.json` with proper app name, icons (192x192, 512x512, maskable), theme color, background color, display: standalone
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- Service worker via Workbox: precache app shell, runtime cache API responses with stale-while-revalidate
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- Add to Home Screen support on iOS and Android
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- Offline fallback page
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## API Integration
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All data comes from the CartSnitch API gateway (`cartsnitch/api`). Base URL configured via environment variable `VITE_API_URL`.
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- JWT auth: store access token in memory (not localStorage), refresh token in httpOnly cookie if possible, or secure storage.
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- TanStack Query handles caching, background refetching, and optimistic updates.
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- API client should handle 401 responses by attempting token refresh before retrying.
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## Development Workflow
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- **Never push directly to main.** Always create feature branches and open PRs.
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- Branch naming: `feature/<description>` or `fix/<description>`
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- Use conventional commits: `feat:`, `fix:`, `refactor:`, `docs:`, `chore:`
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- `npm run dev` for local development with hot reload
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- `npm run build` for production build
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- Lint with ESLint, format with Prettier
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## Important Notes
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- The store account connection flow is the most complex UX. Users need to authenticate with each retailer. This likely involves opening a controlled browser window/iframe where they log in, and CartSnitch captures the resulting session. Design this flow carefully — it needs to feel safe and trustworthy.
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- Public price transparency pages should be SSR-friendly or statically generated for SEO if the "naming and shaming" feature is going to get organic traffic. Consider Next.js for these pages specifically, or a separate lightweight static site.
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- The optimized shopping list is the killer feature for retention. Make it dead simple: add items → see the split → go shop. No friction.
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- Push notifications (via service worker) for price alerts and deal notifications are a Phase 2+ feature but design the alert system with this in mind.
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