120 lines
6.3 KiB
Markdown
120 lines
6.3 KiB
Markdown
# SwimBuddy
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Swimming workout tracker with Apple Watch and WearOS companion apps. Expo 57 + React Native 0.86 + NativeWind v5 + Drizzle ORM + Swift Watch target + Kotlin WearOS target.
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## Commands
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```bash
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npx expo start # Dev server
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npx expo run:ios # Build & run on iOS
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npx expo prebuild -p ios # Regenerate ios/ dir (safe — targets/ persists)
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npx drizzle-kit generate # Regenerate SQL migrations after schema changes
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```
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**WearOS:**
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```bash
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./scripts/build-wearos.sh debug # Build debug APK
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./scripts/build-wearos.sh release # Build release APK
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./scripts/generate-wearos-icon.sh assets/icon.png # Generate launcher icons
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```
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No `npm test` or lint scripts exist yet. No `babel.config.js` — NativeWind v5 uses CSS-first config.
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## Project Structure
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```
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src/
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features/<name>/screens/ # Screen components (registered in navigators)
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features/<name>/components/ # Feature-specific UI
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features/<name>/hooks/ # Feature-specific hooks
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components/ # Shared UI primitives (flat)
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hooks/ # Shared hooks
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navigation/ # React Navigation (RootNav, TabNav, feature stacks)
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db/ # Drizzle schema, client, relations, operations
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providers/ # DatabaseProvider, SettingsProvider (MMKV)
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utils/ # formatTime, calculateSwolf, uuid, etc.
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constants/ # strokes, poolLengths, colors
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types/ # workout.ts, common.ts
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modules/watch-connectivity/ # Expo native module bridging WCSession (Apple Watch)
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modules/wear-connectivity/ # Expo native module bridging Wear Data Layer (WearOS)
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targets/watch/ # Apple Watch app (Swift/SwiftUI) — survives prebuild
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targets/wearos/ # WearOS app (Kotlin/Compose) — survives prebuild
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```
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## Key Conventions
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- **Path aliases**: `@/`, `@features/`, `@components/`, `@db/`, etc. (tsconfig.json)
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- **Feature-based** folder structure with **type-based** shared layer
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- **NativeWind v5**: `className` prop, no babel config, CSS-first. Use `className` not `StyleSheet`
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- **`className` types**: `nativewind-env.d.ts` at root — don't delete
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- **lightningcss pinned** to 1.30.1 in package.json overrides — required by NativeWind v5
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## Watch Target (Apple Watch)
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- Lives in `targets/watch/`, NOT in `ios/` — survives `expo prebuild --clean`
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- Config: `targets/watch/expo-target.config.js`
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- Build: open `ios/SwimBuddy.xcworkspace` in Xcode, select Watch scheme
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- Uses App Groups (`group.nl.guido-it.swimbuddy`) for data sharing
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- WCSession for real-time messaging, `transferUserInfo` for reliable offline sync
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- HealthKit for swim workout tracking (indoor swimming)
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- Swift types `StoredWorkout`, `StoredSet`, `CompletedLap` in `WorkoutManager.swift`
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## WearOS Target
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- Lives in `targets/wearos/` — survives `expo prebuild --clean`
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- Kotlin + Jetpack Compose with Wear OS Compose libraries
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- Build: `./scripts/build-wearos.sh` or open `targets/wearos/` in Android Studio
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- Uses Wear Data Layer API for phone↔watch communication
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- Health Services Client for swim workout tracking
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- Namespace: `nl.guidoit.swimbuddy`
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## Database
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- **expo-sqlite** + **Drizzle ORM** (SQLite dialect, expo driver)
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- Schema: `src/db/schema.ts` — tables: templates, workouts, sets, laps
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- Relations: `src/db/relations.ts`
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- CRUD: `src/db/operations.ts`
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- Client: `src/db/client.ts` — exports `db` and `DATABASE_NAME`
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- Migrations in `drizzle/` — generated by `npx drizzle-kit generate`
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## WCSession Gotchas (Critical)
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These are hard-won bugs that will waste hours if rediscovered:
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- **`NSNull` crashes `sendMessage`**: JS `null` becomes `NSNull` in ObjC, causing `WCErrorCodePayloadUnsupportedTypes` (Code 7010). Always strip `null`/`undefined` values before sending via `cleanForWCSession()`.
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- **Two delegate methods conflict**: Having both `session(_:didReceiveMessage:)` AND `session(_:didReceiveMessage:replyHandler:)` on the same delegate causes iOS to deliver neither. Watch uses `didReceiveMessage` (no replyHandler); phone uses `didReceiveMessage:replyHandler:` for bidirectional sync.
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- **`isReachable` is unreliable**: Only `true` when both apps are foreground. Check `session.activationState == .activated` instead for connection readiness.
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- **Phone `sendMessage` must use `replyHandler: nil`**: Otherwise JS thread blocks waiting for a reply that watch never sends. Use fire-and-forget for workout plans; use `transferUserInfo` for data sync.
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- **Watch `suiteName` vs `UserDefaults.standard`**: Watch only needs local storage, so use `UserDefaults.standard` — the App Groups suite name is only needed for phone↔watch shared data.
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- **Phone `pendingEvents` polling**: Phone polls `pollEvents()` every 2s because Expo Modules' `sendEvent` API doesn't work on `AppContext`. Watch data arrives via `didReceiveUserInfo` delegate → stored in `pendingEvents` array.
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## Watch ↔ Phone Data Flow
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- **Phone → Watch**: `sendMessage` with workout plan (fire-and-forget, promise resolves immediately with `["status":"sent"]`)
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- **Watch → Phone**: `transferUserInfo` with completed workout data (reliable, works in background)
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- **Phone receives**: `pollEvents()` called from JS every 2s, `saveWatchCompletedWorkout()` writes to SQLite
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## UI Conventions
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- Swipe-to-delete on lists uses `SwipeableRow` component (`react-native-gesture-handler`)
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- BuilderScreen pool length is a 25m/50m toggle (not read-only from settings)
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- Templates and Stats features removed from navigation (DB schema preserved but UI deleted)
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- Ionicons used for bottom tab icons (`@expo/vector-icons`)
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## NativeWind v5 TextInput Crash
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`react-native-css` has a bug where the `textAlign` mapping on `TextInput` causes a crash (`path.split` on boolean `true`). The fix is in `src/utils/` — don't remove the workaround without testing TextInput rendering.
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## Gotchas
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- `metro.config.js` has `.sql` in `sourceExts` — required for Drizzle migration imports
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- `expo prebuild` clears and regenerates `ios/` by default. Use `--no-clean` to preserve
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- Watch target compiles as separate Xcode target — not a RN module
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- `react-native-css` is a NativeWind v5 peer dependency — don't remove
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- `@bacons/apple-targets` plugin must be in app.json plugins array
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- WearOS uses same `applicationId` as iOS bundle identifier — don't change without updating both
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## Expo Docs
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Expo SDK 57: https://docs.expo.dev/versions/v57.0.0/
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