# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

## Commands

```bash
# Development
npm run dev          # Start with nodemon auto-reload
npm start            # Production start

# Testing
npm test             # Run all tests once (vitest run)
npm run test:watch   # Watch mode
npm run test:coverage

# Run a single test file
npx vitest run src/modules/3-turn-engine/orderModel.test.js

# Database migrations (requires DATABASE_URL in .env)
npm run migrate:up
npm run migrate:down
npm run migrate:redo
npm run migrate:status
npm run seed         # Seed a tenant via scripts/seed-tenant.mjs
```

No lint command is configured.

## Architecture

This is a **multi-tenant WhatsApp e-commerce chatbot** powered by Express.js. Tenants are WooCommerce store operators; their customers interact via WhatsApp to browse products, build carts, and place orders. All database operations are isolated by `tenant_id`.

### Request flow

```
WhatsApp → Evolution API webhook → /webhook/evolution
                                         ↓
                              1-intake: route & normalize message
                                         ↓
                              3-turn-engine: NLU → FSM → state handler
                                         ↓
                              Response persisted to DB + sent back via Evolution API
```

### Module structure (numbered layers)

- **`src/modules/0-UI/`** — Admin dashboard: REST controllers for products, conversations, settings, prompts, takeovers, recommendations, aliases. Each controller has a `db/` sub-layer for persistence.

- **`src/modules/1-intake/`** — Message ingestion. Routes: `/simulator` (dev UI), `/webhook/evolution` (WhatsApp). Normalizes incoming messages before passing to turn engine.

- **`src/modules/2-identity/`** — Tenant and user management. Maps WhatsApp numbers to WooCommerce customers. Stores encrypted WooCommerce credentials per tenant in `tenant_ecommerce_config`. Routes WooCommerce webhooks.

- **`src/modules/3-turn-engine/`** — Core logic. NLU classifies intents; FSM transitions states (`IDLE → CART → SHIPPING → PAYMENT → WAITING_WEBHOOKS`). Two NLU versions controlled by `USE_MODULAR_NLU` env flag. Two turn engine versions controlled by `TURN_ENGINE` env flag. State handlers map to FSM states.

- **`src/modules/4-woo-orders/`** — WooCommerce order sync. Fetches and caches customer order history for conversation context.

- **`src/modules/shared/`** — DB pool (PostgreSQL via `pg`), SSE for real-time admin UI updates, WooSnapshot (product catalog cache), debug utilities.

### Key integrations

| System | Purpose | Config |
|--------|---------|--------|
| OpenAI | NLU intent classification & response generation | `OPENAI_API_KEY`, `OPENAI_MODEL` |
| Evolution API | WhatsApp send/receive | `EVOLUTION_API_URL`, `EVOLUTION_API_KEY`, `EVOLUTION_INSTANCE_NAME`, `EVOLUTION_SEND_ENABLED` |
| WooCommerce REST API | Products, orders, customers | `WOO_*` env vars or per-tenant in DB |
| PostgreSQL | Primary database | `DATABASE_URL` |

### Database

Migrations live in `db/migrations/` as timestamped SQL files managed by `dbmate`. Key tables:
- `tenants`, `tenant_config`, `tenant_settings`, `tenant_ecommerce_config`, `tenant_channels`
- `wa_identity_map` — WhatsApp ↔ WooCommerce customer mapping
- `wa_conversation_state` — FSM state + context per conversation
- `wa_messages` — Message history
- `woo_products_snapshot` — Cached product catalog
- `prompt_templates` — Versioned LLM prompts
- `human_takeovers`, `audit_log`, `conversation_runs`

### Feature flags (env vars)

- `TURN_ENGINE=v1|v2` — Which turn engine version to use
- `USE_MODULAR_NLU=1` — Use modular NLU (prompt templates from DB) vs. v3 hardcoded
- `EVOLUTION_SEND_ENABLED=1` — Actually send messages to WhatsApp (disable in dev/test)
- `DEBUG_PERF`, `DEBUG_WOO_HTTP`, `DEBUG_LLM`, `DEBUG_EVOLUTION` — Granular debug logging

### Local development

Copy `env.example` to `.env` and fill in values. Use `docker-compose.override.yaml` for local overrides. Run `docker compose up` to start app + Postgres + Redis. The Dockerfile runs migrations automatically on startup (`migrate:up && seed && start`).

Test files use Vitest with `globals: true` — no need to import `describe`, `it`, `expect`.