# HANDOFF.md — Session Handoff (OVERWRITE at the end of every phase or when context is getting long)

> **Read order for a new session:** `NOTES.md` → `STATUS.md` → this file → then work.
> If this file disagrees with the code, trust the code and fix this file.

## 1. Where we are
- **Last completed step:** 7.3 (Expedition UI: start panel, progress bar, claim button) — TICKED in STATUS.md
- **Next step:** 8.1 — Leaderboard: `GET /api/leaderboard?type=level|gold|kills` top 50, with pagination param.
- **Updated:** 2026-10-21
- **Was the last session cut off mid-task?** No

## 2. Verified state (run these first)
| Command | Expected |
|---|---|
| `npm install` | succeeds |
| `npm run migrate` | applies 001–006 / "nothing to do" |
| `npm test` | **153 passing, 0 failing** (85 unit + 68 integration) |

## 3. What exists now (files that matter)
- `src/db/migrations/005_expeditions.sql` — `expedition_defs` + `expeditions` tables, unique active-expedition index, 3 seed definitions.
- `src/services/expeditionService.js` — `startExpedition`, `getActive`, `claimExpedition`, `listDefinitions`. Uses WeakMap stmt cache.
- `src/routes/expeditions.js` — `POST /api/expeditions/start`, `GET /api/expeditions/active`, `POST /api/expeditions/claim`, `GET /api/expeditions/defs`.
- `src/game/energy.js` — `computeEnergy` now uses `now()` from utils/time.
- `src/services/characterService.js` — `createCharacter`, `getCharacterProfile`, `getCharacterIdForUser`.
- `src/services/huntService.js` — `hunt(characterId, zoneId, {rng, now})`; ONE transaction; test-injectable.
- `src/services/inventoryService.js` — `listInventory`, `equipItem`, `unequipItem`, `useConsumable`. Uses WeakMap stmt cache.
- `src/services/shopService.js` — `getStock`, `buyItem`, `sellItem`. Uses WeakMap stmt cache.
- `src/game/combat.js` — `resolveCombat(hero, monster, rng)`; both sides attack each round, faster first.
- `src/game/stats.js` — `calcDerived()` is the ONLY derived-stat formula. Also re-exports xpToNext/checkLevelUp.
- `src/utils/time.js` — `now()/setNow()/resetNow()`; never call `Date.now()` in services.
- `src/routes/zones.js` — `GET /api/zones`.
- `src/routes/combatLog.js` — `GET /api/combat-log`.
- `public/game.html` — dashboard with stats panel, tabbed action panel (Hunt/Inventory/Expedition).
- `public/js/game.js` — full hunt UI + inventory UI + expedition UI (start panel, progress bar, claim button, auto-refresh).
- `public/css/main.css` — expedition UI styles (cards, progress bar, buttons).
- `public/shop.html` — dedicated shop page with buy/sell tabs.
- `tests/integration/expeditions.test.js` — 13 integration tests.
- `tests/integration/shop.test.js` — 16 integration tests.
- `tests/integration/shop-page.test.js` — 5 integration tests.
- `tests/integration/inventory.test.js` — 20 integration tests.

## 4. Half-finished / fragile things
- No leaderboard UI yet (Phase 8).
- HP never regenerates naturally; only level-up restores it.
- No restart-persistence test for sessions.
- `npm run seed` script in package.json points to nonexistent `scripts/seed.js`.
- Equipment bonuses not yet passed into combat (Issue #5 in STATUS.md).
- No shop link in game.html top-bar navigation.

## 5. Decisions & deviations from the docs
- D-004..D-007 in `docs/DECISIONS.md` (combat rounds, equipment counted once, session store, clock).
- Zod query param parsing uses `zod.coerce.number()` because Express query params are strings.
- Inventory response uses `itemId` (item.id) and `inventoryId` (inventory row id) to avoid confusion.
- Consumable effect parsing: regex `^(heal|energy):(\d+)$` on items.effect field.
- Qty decrement avoids CHECK constraint violation: delete directly when qty==1, decrement when qty>1.
- **D-008:** Shop materials with buy_price=0 sell at `floor(default_rate * character_level / item_min_level)`.
- **D-009:** `sellItem` checks equipped_slot before material type.
- **D-010:** `startExpedition` checks active-expedition before energy (so 409 ACTIVE_EXPEDITION takes priority over 422 INSUFFICIENT_ENERGY).
- **D-011:** `computeEnergy` uses `now()` from utils/time instead of `Date.now()` directly, so test time overrides work.

## 6. Gotchas learned
- `npm test` must be `node --test` with NO path/glob; files must be named `*.test.js`.
- better-sqlite3-session-store ignores `clear:false`; that's why the timer is unref'd.
- Statement caches are per-DB-handle (WeakMap) in huntService; copy that pattern for new services.
- Verify test COUNT, not just "all passing".
- Node.js `fetch` doesn't persist cookies across calls — extract `Set-Cookie` header and pass manually in integration tests.
- SQL `SELECT id` from inventory returns the auto-increment row id; rename with `AS inventory_id` when you also need `item_id`.
- Transaction callback args must match the call order exactly.
- Error responses from route-level `AppError`s do NOT include `data` field.
- `setNow` affects ALL `now()` calls including those in service logic — for tests that need to verify time-based behavior, manipulate the DB directly instead.

## 7. Next-step briefing (8.1)
- **Goal:** Leaderboard endpoint — `GET /api/leaderboard?type=level|gold|kills` top 50, with `?page=N` pagination.
- **Docs:** GAME_DESIGN.md §Leaderboards, DATABASE.
- **Files to create:** `src/services/leaderboardService.js`, `src/routes/leaderboard.js`.
- **Files to modify:** `src/app.js` (register route).
- **API:** `GET /api/leaderboard?type=level|gold|kills&page=1` — returns ranked list of heroes (name, level/gold/kills) with pagination metadata.

## 8. Open Known Issues
STATUS.md issues 1–6 (balance, dangling `seed` script, restart test, equipment-in-combat, HP regen, zone min_level balance).