# Tasks: enterprise-api-plugin-inventory

**Change ID**: enterprise-api-plugin-inventory
**Package**: `@suaveplan/api-plugin-inventory`
**Target path**: `api/logistics/api-plugin-inventory`
**Prerequisite packages on Verdaccio**: `@suaveplan/api`, `@suaveplan/api-shared`, `@suaveplan/api-plugin-auth`, `@suaveplan/api-plugin-database`, `@suaveplan/events`, `@suaveplan/idempotency`, `@suaveplan/audit-logging`, `@suaveplan/rate-limiter`, `@suaveplan/error`

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## 0. Pre-flight (non-negotiable)

- [ ] 0.1 Confirm clean working tree (`git status` reports nothing) and no in-flight worktrees with uncommitted work (`git worktree list` then `git status` in each)
- [ ] 0.2 If any worktrees exist under `.claude/worktrees/`, account for each one: still-active agent, work-pending-merge, or stale-and-prune. Stale worktrees MUST be removed (`git worktree remove`) before opening a new one — code that has been lost twice on main is the failure mode this guards against.
- [ ] 0.3 Confirm the package set in `MANIFEST.md` matches `find packages -maxdepth 3 -name package.json` count. Drift here means a prior change archived without regenerating the manifest.

## 1. Scaffold + types + errors + events

- [ ] Create `api/logistics/api-plugin-inventory/`; `package.json` v0.0.0; standard tooling. Include `decimal.js` in deps (Bun catalog).
- [ ] Types: `InventoryItem`, `CreateItemInput`, `UpdateItemInput`, `StockMovement`, `Warehouse`, `StockLevel`, `LotInfo`, `CostingMethod` enum, `AdjustmentRecord`, `InventoryConfig` (Zod; expanded with basePath, defaultCostingMethod, lowStockThreshold).
- [ ] Errors: 6-code union + registration. Test + doc.
- [ ] Events: `InventoryEventMap` (inventory:stock:received, inventory:stock:issued, inventory:stock:low, inventory:adjustment:created). Module augmentation — no `as never`.

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## 2. SurrealQL

- [ ] `inventory_item.surql`, `warehouse.surql`, `stock_level.surql`, `stock_movement.surql`, `lot.surql`, `adjustment.surql`. All with tenantId indexes.

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## 3. Services (all `.test.ts` + `.md`)

- [ ] **ItemService**: `createItem`, `updateItem`, `deleteItem`, `getItem`, `listItems` (paginated, filterable).
- [ ] **WarehouseService**: `createWarehouse`, `updateWarehouse`, `deleteWarehouse`, `getWarehouse`, `listWarehouses`.
- [ ] **StockService**: `getStockLevel(itemId, warehouseId)`, `listStockLevels(itemId)`, `isLowStock(itemId)`.
- [ ] **MovementService**: `receive`, `issue`, `transfer`. All idempotent; emit `inventory:stock:received` / `:issued`.
- [ ] **CostingService**: `calculateCost(itemId, quantity, method)` — FIFO/LIFO/average/specific-ID. Use `decimal.js` for all arithmetic. Fully tested edge cases.
- [ ] **AdjustmentService**: `createAdjustment` (physical-count discrepancy); audit-logged; emit event.
- [ ] **ReportService**: `getLowStockReport()`, `getExpiringStockReport()`, `getValuationReport()`.

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## 4. `procurement:grn:completed` subscription

- [ ] In `onReady`: subscribe to `procurement:grn:completed` event on bus; for each GRN line item, call `MovementService.receive()` to create stock movement. Properly typed — no `as never` cast.
- [ ] `onClose`: detach bus subscription.
- [ ] Integration test: emit `procurement:grn:completed` → verify stock movement created.

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## 5. Routes

- [ ] Full CRUD for items, warehouses; stock queries; movement creation; adjustments; reports.
- [ ] All write routes: `requireAuth` + permission gates + idempotency + audit where applicable.
- [ ] Route `.test.ts` + `.md`.

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## 6. Plugin factory + integration tests + publish

- [ ] `createInventoryPlugin`: `definePlugin`, `dependencies: ["database", "auth"]`, `migrationsPath: "./surql"`.
- [ ] Integration: receive stock → issue stock → FIFO costing → low stock alert → adjustment (real SurrealDB).
- [ ] `bunx turbo lint typecheck test --filter=@suaveplan/api-plugin-inventory` — green; 100% coverage.
- [ ] `bun scripts/publish.ts --package @suaveplan/api-plugin-inventory`.
- [ ] Archive → `openspec/archive/2026-04-24-enterprise-api-plugin-inventory/`.