Safarnak App - Cursor AI Configuration

Safarnak App – Cursor AI Repository Rules

Project Overview
- Single-root monorepo for a full-stack, offline-first travel app.
- Client: Expo React Native (Android/iOS/Web) with NativeWind v4.
- Server: Cloudflare Worker (GraphQL Yoga), Cloudflare D1 via Drizzle ORM.
- Shared: GraphQL schema and operations under `graphql/` used by both client and worker.
- Shared: Database schema (`database/schema.ts`) shared between client and worker - unified schema with UUID IDs, separate adapters for server (D1) and client (expo-sqlite).
- Database: `database/` folder contains unified schema with separate adapters - same table definitions, different database backends.

Current Stack (as of v1.13.0)
- TypeScript ~5.9.3
- React 19.1.0, React Native 0.81.5, Expo ~54.0.20
- Expo Router ~6.0.13, NativeWind ^4.1.21, Tailwind ^3.4.17
- Apollo Client 3.8.0, GraphQL ^16.11.0, GraphQL Yoga ^5.16.0
- Drizzle ORM ^0.44.7 (Shared schema for both server & client), Cloudflare D1 (server), Expo SQLite (client)
- Subscriptions: `graphql-workers-subscriptions` ^0.1.6 with Durable Objects
- ESLint ^9.38.0, Prettier ^3.6.2

Repository Structure
```
worker/                 # Cloudflare Worker resolvers and entry
graphql/                # Shared GraphQL schema + operations
api/                    # Client GraphQL types & hooks (generated, with automatic Drizzle sync)
database/               # Shared database schema and adapters
├── schema.ts         # Unified schema with UUIDs (server + client tables in one file)
├── server.ts         # Server adapter (Cloudflare D1) - exports getServerDB()
├── client.ts         # Client adapter (Expo SQLite) - exports getLocalDB(), sync utilities
├── index.ts          # Main exports (re-exports from schema, server, client)
├── types.ts          # Database types
└── utils.ts          # UUID utilities (createId, isValidId)
migrations/           # Server-only migrations (Cloudflare D1, at project root)
store/                  # Redux Toolkit store, slices, middleware
app/                    # Expo Router pages
components/             # UI components & contexts
constants/, hooks/, locales/ ...
```

Worker
- Entry point: `worker/index.ts` (defined in `wrangler.toml` main).
- Uses `readGraphQLSchema` from `graphql/schema-loader.ts`.
- Resolvers under `worker/queries`, `worker/mutations`, `worker/subscriptions`.
- Subscriptions enabled with Durable Object `SubscriptionPool`.

GraphQL & Codegen
- Schema: `graphql/schema.graphql`.
- Operations: `graphql/queries/*.graphql`.
- Generate client code: `yarn codegen` → `api/types.ts`, `api/hooks.ts`.
- Never edit `api/types.ts` or `api/hooks.ts` manually.

Path Aliases (TypeScript & Metro)
- Use ONLY path aliases; avoid all relative imports.
```
"@/*"           → "./*"
"@components/*" → "./components/*"
"@graphql/*"    → "./graphql/*"
"@database/*"   → "./database/*"   # All database schemas & client utilities
"@worker/*"     → "./worker/*"
"@api"          → "./api"
"@api/*"        → "./api/*"
"@store"        → "./store"
"@store/*"      → "./store/*"
"@hooks"        → "./hooks"
"@hooks/*"      → "./hooks/*"
"@constants"    → "./constants"
"@constants/*"  → "./constants/*"
```

Updated aliases (tsconfig + Metro):
```
"@/*"           → "./*"              # e.g., import from '@/store/...'
"@ui/*"         → "./ui/*"
"@graphql/*"    → "./graphql/*"
"@database/*"   → "./database/*"
"@worker/*"     → "./worker/*"
"@api"          → "./api"
"@api/*"        → "./api/*"
"@state"        → "./ui/state"       # UI local state utilities
"@state/*"      → "./ui/state/*"
"@hooks"        → "./ui/hooks"
"@hooks/*"      → "./ui/hooks/*"
"@constants"    → "./constants"
"@constants/*"  → "./constants/*"
"@locales"      → "./locales"
"@locales/*"    → "./locales/*"
"@assets"       → "./assets"
"@assets/*"     → "./assets/*"
```

GraphQL Endpoint Configuration (Client)
- Preferred: set `expo.extra.graphqlUrl` via `app.config.js` (reads from env vars).
- Environment variables (in priority order):
  - `EXPO_PUBLIC_GRAPHQL_URL_DEV` or `EXPO_PUBLIC_GRAPHQL_URL` (Expo inlines these at build time)
  - `GRAPHQL_URL_DEV` or `GRAPHQL_URL` (runtime env vars)
- Dev fallback: `http://192.168.1.51:8787/graphql` (or auto-derived from Metro host)
- Production default: `https://safarnak.app/graphql`
- Sources: `api/client.ts` (URI resolution), `app.config.js` (configures `expo.extra.graphqlUrl`)

Critical Rules
1) Never add `"type": "module"` to `package.json`.
2) Use `eslint.config.mjs`; do not convert ESLint config type.
3) Keep strict separation:
   - `graphql/` is shared between client and worker.
   - `api/` is client-only, generated hooks with automatic Drizzle sync.
   - `worker/` is server-only code.
   - `database/schema.ts` is SHARED between client and worker - single source of truth:
     * `schema.ts` - Unified schema defining both server tables (users, trips, etc.) and client cached tables (cachedUsers, cachedTrips, etc.) with UUID IDs
     * `server.ts` - Server adapter: `getServerDB(d1)` for Cloudflare D1 (worker resolvers use this)
     * `client.ts` - Client adapter: `getLocalDB()` for Expo SQLite (client components use this)
     * Both adapters import from the same `schema.ts` file, ensuring schema consistency
     * `index.ts` - Exports all schemas and utilities
4) Always run `yarn codegen` after changing GraphQL schema or operations.
5) Never manually edit generated files (`api/types.ts`, `api/hooks.ts`).
6) Use path aliases exclusively; avoid relative imports entirely.
7) Styling: Prefer NativeWind Tailwind classes via `className` over inline styles.
8) Before testing APIs locally, run `yarn db:migrate` to apply migrations.
9) Worker entry is `worker/index.ts`; do not change `wrangler.toml` main without reason.

Auth & Client Patterns
- PBKDF2 (100k, SHA-256, 16-byte salt) hashing in worker utilities.
- Token: SHA-256 of `userId + username + timestamp`, stored in Redux + AsyncStorage.
- Apollo auth link adds `Authorization: Bearer <token>`.
- Auth pages under `app/(auth)`, auto-redirects based on Redux `isAuthenticated`.

Subscriptions
- `graphql-workers-subscriptions` with Durable Object `SubscriptionPool`.
- GraphiQL available at `/graphql` with WS subscriptions in dev.

Commands
Development
- `yarn dev`              # Start worker (8787) + Expo dev server
- `yarn start`            # Expo dev server only
- `yarn worker:dev`       # Worker only

GraphQL
- `yarn codegen`          # Generate types & hooks
- `yarn codegen:watch`    # Watch mode

Database
- `yarn db:generate`      # Generate migration from schema
- `yarn db:migrate`       # Apply migrations to local D1
- `yarn db:studio`        # Drizzle Studio

Build
- `yarn android`          # Run on Android
- `yarn android:newarch`  # New Architecture
- `yarn build:debug`      # EAS debug build (Android)
- `yarn build:release`    # EAS release build (Android)
- `yarn build:local`      # Local Gradle release

Quality & Utilities
- `yarn lint` / `yarn lint:fix`
- `yarn clean`

Versioning & Releases (CI-driven)
- Source of truth: `package.json` version.
- Commit conventions power release bumps via release-it in CI:
  - `feat:` → minor
  - `fix:`  → patch
  - others → build only
- APK metadata: versionName from `package.json`; versionCode derived or overridden by `ANDROID_VERSION_CODE`.

Debugging Tips
- Metro issues: `yarn clean` then restart.
- Worker: check `wrangler` logs, `http://localhost:8787/graphql`.
- Type errors: ensure schema, run `yarn codegen`.
- DB issues: inspect `.wrangler/state/v3/d1/`, re-run `yarn db:migrate`.

Security
- Validate all resolver inputs; fail fast on invalid data.
- Drizzle ORM prevents SQL injection.
- Keep tokens and secrets out of client code.

Performance
- Use `React.memo`, `useCallback`, `useMemo` prudently.
- Keep Redux state lean; leverage Apollo cache appropriately.

When Making Changes
- Follow existing patterns and directory ownership.
- Prefer path aliases; avoid relative imports.
- Update `graphql/schema.graphql` and `graphql/queries/*.graphql` first, then `yarn codegen`.
- Implement worker resolvers in `worker/*` only.
- Do not touch generated files (`api/hooks.ts`, `api/types.ts`).
- Use `@database/server` for worker resolvers, `@database/client` for client components.

# Safarnak App - Cursor AI Configuration

## Project Overview

You are working on **Safarnak**, a full-stack offline-first travel application. This is a **unified single-root monorepo** where both client and server code coexist in the same directory structure.

### Key Architecture Points
- **Client**: Expo React Native app (iOS/Android/Web) with NativeWind v4 styling
- **Worker**: Cloudflare Worker backend (`worker/index.ts` - entry point defined in wrangler.toml)
- **Resolvers**: GraphQL resolvers in `worker/` folder (server-side only)
- **Shared**: GraphQL schema (`graphql/`) shared between client & worker
- **Shared Drizzle**: Unified database schema (`database/schema.ts`) shared between client and worker - same table definitions with UUID IDs, separate adapters for server (D1) and client (expo-sqlite)
- **Styling**: NativeWind v4 (Tailwind CSS) for utility-first React Native styling
- **No Workspaces**: This is NOT a Yarn workspace - it's a single package.json project

## Technology Stack

### Frontend (Client)
- **Expo** ~54.0.20 - React Native framework with file-based routing
- **React Native** 0.81.5 - Mobile framework
- **React** 19.1.0 - UI library
- **Expo Router** ~6.0.13 - File-based navigation
- **NativeWind** ^4.1.21 - Tailwind CSS for React Native (utility-first styling)
- **Tailwind CSS** ^3.4.17 - CSS framework (configured for React Native)
- **Redux Toolkit** ^2.9.2 - State management
- **Redux Persist** ^6.0.0 - Persistent state
- **Apollo Client** 3.8.0 - GraphQL client
- **react-i18next** ^16.2.1 - Internationalization (English + Persian/Farsi)
- **Drizzle ORM** ^0.44.7 - Type-safe database queries (shared schema for both server & client)

### Backend (Worker)
- **Cloudflare Workers** - Serverless edge runtime
- **GraphQL Yoga** ^5.16.0 - GraphQL server
- **Cloudflare D1** - Serverless SQLite database
- **Drizzle ORM** ^0.44.6 - Type-safe ORM
- **graphql-workers-subscriptions** ^0.1.6 - Real-time subscriptions with Durable Objects

### Code Generation
- **GraphQL Codegen** ^6.0.1 - Auto-generate TypeScript types and React Apollo hooks
- **typescript-operations** ^5.0.2 - Generate operation-specific types
- **typescript-react-apollo** ^4.3.3 - Generate React Apollo hooks

### Shared
- **TypeScript** ~5.9.3 - Balanced configuration prioritizing development efficiency
- **GraphQL** ^16.11.0 - Schema and type definitions
- **ESLint** ^9.38.0 - Developer-friendly config with TypeScript/React/React Native plugins
- **Prettier** ^3.6.2 - Code formatting

## Project Structure

```
safarnak.app/                           # Single root directory
├── worker/                             # GraphQL resolvers (SERVER-SIDE ONLY)
│   ├── index.ts                        # Cloudflare Worker entry point (main export, witnesses resolvers + GraphQL Yoga)
│   ├── types.ts                        # Server-specific types
│   ├── queries/                        # Query resolvers: getMessages, me, getTrips, getTrip
│   ├── mutations/                      # Mutation resolvers: register, login, addMessage, createTrip, updateTrip
│   ├── subscriptions/                  # Subscription resolvers: newMessages
│   └── utilities/                       # Password hashing (PBKDF2), token generation
├── graphql/                            # SHARED between client & worker
│   ├── schema.graphql                  # Pure GraphQL schema definition
│   ├── queries/                        # Query definitions (.graphql files)
│   │   ├── addMessage.graphql
│   │   ├── createTrip.graphql
│   │   ├── getMessages.graphql
│   │   ├── getTrip.graphql
│   │   ├── getTrips.graphql
│   │   ├── login.graphql
│   │   ├── me.graphql
│   │   └── register.graphql
│   ├── generated/
│   │   └── schema.d.ts                 # Worker schema declarations
│   ├── schema-loader.ts                # Worker schema loader
│   └── index.ts                         # Shared exports only
├── api/                                # Client API layer (CLIENT-SIDE ONLY)
│   ├── client.ts                       # Apollo Client setup with auth link and DrizzleCacheStorage
│   ├── cache-storage.ts                # DrizzleCacheStorage - automatic Apollo → Drizzle sync on every cache write
│   ├── hooks.ts                        # 🤖 Auto-generated React Apollo hooks (queries, mutations, subscriptions)
│   ├── types.ts                        # 🤖 Auto-generated GraphQL types
│   ├── utils.ts                        # Client utility functions (storage, error handling, network checks, logout, API types)
│   └── index.ts                        # Main API exports (re-exports hooks + all utilities)
├── database/                           # Shared database schema and adapters
│   ├── schema.ts                       # Unified schema with UUIDs (server + client tables in one file)
│   ├── server.ts                       # Server adapter (Cloudflare D1) - exports getServerDB()
│   ├── client.ts                       # Client adapter (Expo SQLite) - exports getLocalDB(), sync utilities
│   ├── index.ts                        # Main exports (re-exports from schema, server, client)
│   ├── types.ts                        # Database types
│   └── utils.ts                        # UUID utilities (createId, isValidId)
├── migrations/                         # Server-only migrations (Cloudflare D1, at project root)
├── store/                              # Redux state management (CLIENT)
│   ├── index.ts                        # Store configuration with persist
│   ├── hooks.ts                        # Typed useAppDispatch, useAppSelector
│   ├── slices/                         # Redux slices
│   │   ├── authSlice.ts                # Auth state (user, token, isAuthenticated)
│   │   └── themeSlice.ts               # Theme state
│   └── middleware/                      # Redux middleware
│       └── offlineMiddleware.ts        # Offline mutation queue
├── app/                                # Expo Router pages (CLIENT)
│   ├── _layout.tsx                     # Root layout with providers
│   ├── (auth)/                         # Authentication route group (public routes)
│   │   ├── _layout.tsx                # Auth routing layout
│   │   ├── welcome.tsx                # Welcome/onboarding page
│   │   ├── login.tsx                  # Login page (with auto-redirect for logged-in users)
│   │   └── register.tsx               # Registration page (with auto-redirect for logged-in users)
│   └── (app)/                          # Main app route group (protected routes with tabs)
│       ├── _layout.tsx                 # Tab bar layout (feed, explore, trips, profile)
│       ├── (feed)/                     # Feed tab - social posts
│       ├── (explore)/                  # Explore tab - search & discovery
│       ├── (trips)/                    # Trips tab - trip management
│       └── (profile)/                  # Profile tab - user account
├── components/                         # React components (CLIENT)
│   ├── AuthWrapper.tsx                 # Authentication guard component
│   ├── MapView.tsx                     # Interactive MapLibre GL map (native)
│   ├── context/                        # React contexts
│   │   ├── LanguageContext.tsx         # i18n language switching
│   │   ├── LanguageSwitcher.tsx       # Language selector UI
│   │   └── ThemeContext.tsx           # Dark/light theme
│   └── ui/                             # Themed UI components
│       ├── Themed.tsx                  # Theme-aware View/Text
│       ├── ThemeToggle.tsx             # Dark mode toggle
│       ├── CustomText.tsx              # i18n-aware text component
│       └── ...                         # Other UI components
├── constants/                          # App constants (CLIENT)
│   ├── app.ts                          # App configuration
│   ├── Colors.ts                       # Theme colors
│   └── index.ts                        # Constants exports
├── hooks/                              # Custom React hooks (CLIENT)
├── locales/                            # i18n translations
│   ├── en/translation.json             # English
│   └── fa/translation.json             # Persian (Farsi)
├── assets/                             # Static assets (images, fonts)
├── metro.config.js                     # Metro bundler config with NativeWind
├── babel.config.js                     # Babel config with NativeWind preset
├── tailwind.config.js                  # Tailwind CSS configuration
├── global.css                          # Tailwind CSS directives (@tailwind base/components/utilities)
├── wrangler.toml                       # Cloudflare Workers config (worker entry: worker/index.ts)
├── drizzle.config.ts                   # Drizzle ORM config
├── codegen.yml                         # GraphQL Codegen configuration
├── eslint.config.mjs                   # ESLint flat config (ES module)
├── app.config.js                       # Expo configuration
├── tsconfig.json                       # TypeScript config with enhanced checking
└── package.json                        # Single package.json (no workspaces)
```

## Path Aliases (TypeScript & Metro)

```typescript
"@/*"           → "./*"              // Root files (use '@/api' not '../api')
"@components/*" → "./components/*"   // UI components
"@graphql/*"    → "./graphql/*"      // Shared GraphQL definitions
"@database/*"   → "./database/*"     // Shared database schema & adapters (schema.ts, server.ts, client.ts)
"@worker/*"     → "./worker/*"       // Worker resolvers
"@api"          → "./api"            // API layer (client hooks)
"@api/*"        → "./api/*"          // API subfolder imports
"@store"        → "./store"           // Redux store
"@store/*"      → "./store/*"        // Store subfolder imports
"@hooks"        → "./hooks"          // Custom React hooks
"@hooks/*"      → "./hooks/*"        // Hooks subfolder imports
"@constants"    → "./constants"      // App constants
"@constants/*"  → "./constants/*"    // Constants subfolder imports
"@locales"      → "./locales"        // i18n translations
"@locales/*"    → "./locales/*"      // Locales subfolder imports
```

## Key Patterns & Best Practices

### 1. GraphQL Architecture

**Shared (graphql/):**
- `schema.graphql` - Pure GraphQL schema definition (shared)
- `queries/*.graphql` - Query/mutation definitions (shared)
- `schema-loader.ts` - Worker schema loader
- `generated/schema.d.ts` - Worker schema declarations

**Client-Side (api/):**
- `client.ts` - Apollo Client setup with auth link and DrizzleCacheStorage persistence
- `cache-storage.ts` - DrizzleCacheStorage implements Apollo's PersistentStorage interface, automatically syncs to structured tables on every cache write
- `hooks.ts` - Auto-generated React Apollo hooks (queries, mutations, subscriptions)
- `types.ts` - Auto-generated GraphQL types
- `utils.ts` - Utility functions (storage, error handling, network checks, logout)
- `index.ts` - Main exports (re-exports hooks + all utilities)

**Server-Side (worker/):**
- `queries/` - Query resolver functions (getMessages, me, getTrips, getTrip)
- `mutations/` - Mutation resolver functions (register, login, addMessage, createTrip, updateTrip)
- `subscriptions/` - Subscription resolvers (newMessages)
- `utilities/` - Password hashing, token generation

**Worker (worker/index.ts):**
```typescript
import { readGraphQLSchema } from '@graphql/schema-loader';
import { Query } from './queries';
import { Mutation } from './mutations';
import { Subscription } from './subscriptions';
// GraphQL Yoga server using shared schema + resolvers
```

**Codegen Workflow (dev-time):**
1. Define schema in `graphql/schema.graphql`
2. Define operations in `graphql/queries/*.graphql`
3. Run `yarn codegen` to generate `api/types.ts` and `api/hooks.ts`
4. Import from `@api` in client components (never import raw `.graphql` files)

### 2. Database Patterns

**Shared Drizzle Schema (database/):**
- `database/schema.ts` - **Unified schema** defining both server tables and client cached tables with UUID IDs
- Server tables: `users`, `trips`, `tours`, `messages`, `subscriptions`, etc. (used by worker via `database/server.ts`)
- Client cached tables: `cachedUsers`, `cachedTrips`, `cachedTours`, etc. (used by client via `database/client.ts`)
- Both use UUID (text) IDs for consistency - no conversions needed
- Shared field definitions reduce duplication (`userFields`, `tripFields`, etc.)

**Server Usage (Worker):**
- Worker uses `database/server.ts` → `getServerDB(d1)` for Cloudflare D1 database
- Imports server tables from `database/schema.ts` (e.g., `users`, `trips`, `tours`)
- All IDs are UUIDs (text) - work seamlessly with GraphQL `ID!` type
- Server-only fields: `passwordHash` (users), `aiGenerated` (trips), etc.

**Client Usage:**
- Client uses `database/client.ts` → `getLocalDB()` for Expo SQLite database
- Imports client cached tables from `database/schema.ts` (e.g., `cachedUsers`, `cachedTrips`)
- Same UUID format as server tables - perfect consistency
- Automatic Apollo cache sync via `DrizzleCacheStorage` - syncs on every cache write (no manual sync needed)
- All Apollo hooks automatically benefit from automatic sync - no wrapper hooks needed

**Worker Resolvers:**
```typescript
import { getServerDB, users, trips } from '@database/server';
import { eq } from 'drizzle-orm';

const db = getServerDB(context.env.DB);
const user = await db.select().from(users).where(eq(users.id, userId)).get();
// userId is a UUID string - no conversions needed!
```

**Client Local Database:**
```typescript
import { getLocalDB, cachedTrips } from '@database/client';
import { eq } from 'drizzle-orm';

const db = await getLocalDB();
const trips = await db.select().from(cachedTrips).where(eq(cachedTrips.userId, userId)).all();
// Works offline - queries local SQLite database
```

**Migrations:**
- Generate: `yarn db:generate` (for server database from `database/schema.ts`)
- Apply: `yarn db:migrate` (for server D1 database)
- Client database: Auto-migrated on app initialization (see `database/client.ts`)
- Schema exports: `drizzle.config.ts` points to `schema.ts` (exports `serverSchema` as `schema` for migrations)

### 3. Authentication

**Password Hashing (worker/utils.ts):**
- PBKDF2 with 100,000 iterations
- SHA-256 hash function
- 16-byte salt stored with hash

**Token Generation:**
- SHA-256 hash of `userId + username + timestamp`
- Stored in Redux + AsyncStorage on client

**Auth Flow:**
1. Client calls `register` or `login` mutation
2. Worker hashes password, generates token
3. Client stores token in Redux (persisted)
4. Apollo Client adds token to headers via `authLink`

**Auth Pages:**
- `app/(auth)/welcome.tsx` - Welcome/onboarding page
- `app/(auth)/login.tsx` - Dedicated login page with auto-redirect if already logged in
- `app/(auth)/register.tsx` - Dedicated registration page with auto-redirect if already logged in
- Both pages check `isAuthenticated` from Redux and redirect to `/(app)` if user is logged in
- AuthWrapper redirects unauthenticated users to `/(auth)/login`

**Routing & Navigation:**
- Root initial route: `(auth)` (see `app/_layout.tsx` `unstable_settings.initialRouteName`)
- Auth stack: `app/(auth)/_layout.tsx` defines `welcome`, `login`, and `register`
- Main app stack: `(app)` route group with 4 tabs: `(feed)`, `(explore)`, `(trips)`, `(profile)`
- Route groups use parentheses and don't appear in URLs (e.g., `(auth)` → `/auth`, `(app)` → `/`)

### 4. Offline-First Strategy

**Client-Side Storage:**
- **Apollo Cache (SQLite)**: Normalized cache stored in `apollo_cache_entries` table (Drizzle SQLite)
- **Drizzle Cache (SQLite)**: Structured relational cache in `safarnak_local.db`
- **AsyncStorage**: Mutation queue for offline operations
- **Redux Persist**: UI state survives app restarts

**Automatic Sync:**
- **DrizzleCacheStorage** (`api/cache-storage.ts`): Implements Apollo's PersistentStorage interface
- Automatically syncs on every Apollo cache write (via `setItem()`)
- Dual-write in single transaction: raw cache + structured tables
- Event-driven sync (no timers/polling) - triggers on every cache write
- No wrapper hooks needed - all Apollo hooks automatically benefit

**Sync Mechanism:**
- Apollo cache → Drizzle sync happens automatically via `DrizzleCacheStorage.setItem()`
- Writes to `apollo_cache_entries` (raw cache) + structured tables (cachedUsers, cachedTrips, etc.)
- Extracts entity type and ID from cache keys (e.g., "User:123" → User entity)
- Upserts into Drizzle cached tables with sync metadata
- Background sync doesn't block UI

**Offline Capabilities:**
- Query local Drizzle database even when offline
- Queue mutations when offline (AsyncStorage + Redux middleware)
- Automatic sync when connection restored
- Real-time database statistics available

**Reconnect & Queue Behavior:**
- Pending mutations are persisted in order and retried on reconnect.
- Successful mutations are removed; corresponding cached entities are marked synced.
- DrizzleCacheStorage continues dual-write on every Apollo cache update; no wrapper hooks are required.
- Network status comes from NetInfo plus a lightweight backend reachability probe.

**Network Detection:**
- NetInfo - Detect connection status
- Backend reachability check via HEAD probe
- System status page shows network + database stats

### 5. Styling with NativeWind v4 (Tailwind CSS)

**NativeWind Configuration:**
- `tailwind.config.js` - Tailwind configuration with NativeWind preset
- `global.css` - Tailwind directives (imported in `app/_layout.tsx`)
- `babel.config.js` - NativeWind Babel preset
- `metro.config.js` - NativeWind Metro integration with `withNativeWind()`

**Using Tailwind Classes:**
```typescript
import { View, Text } from 'react-native';

export default function MyComponent() {
  return (
    <View className="flex-1 bg-white dark:bg-black p-4">
      <Text className="text-lg text-gray-800 dark:text-gray-200 font-bold">
        Hello World
      </Text>
    </View>
  );
}
```

**Key Features:**
- Utility-first CSS classes (e.g., `flex-1`, `p-4`, `bg-white`)
- Dark mode support via `dark:` prefix (e.g., `dark:bg-black`)
- Responsive design utilities
- Automatic theme-aware colors using Redux theme state

**Theme Integration:**
- NativeWind v4 responds to `Appearance.setColorScheme()` changes
- ThemeContext syncs Redux theme state with React Native Appearance API
- Dark mode classes automatically applied based on theme state

**Best Practices:**
- Use Tailwind classes for styling instead of inline styles when possible
- Combine with theme-aware components (`Themed.tsx`) for complex theming
- Use `className` prop on React Native components (View, Text, TouchableOpacity, etc.)
- Prefer Tailwind utilities over custom styles for consistency

### 6. Component Patterns

**Functional Components:**
```typescript
interface Props {
  title: string;
  onPress: () => void;
  className?: string; // Optional Tailwind classes
}

export default function MyComponent({ title, onPress, className }: Props) {
  // Use hooks
  const { t } = useTranslation();
  
  // Use callbacks for performance
  const handlePress = useCallback(() => {
    onPress();
  }, [onPress]);
  
  return (
    <View className={`p-4 ${className || ''}`}>
      <Text className="text-base font-semibold">{title}</Text>
    </View>
  );
}
```

**Context Usage:**
```typescript
// Provide at root (_layout.tsx)
<LanguageProvider>
  <ThemeProvider>
    <Stack />
  </ThemeProvider>
</LanguageProvider>

// Consume anywhere
const { currentLanguage, changeLanguage } = useLanguage();
```

### 7. TypeScript Standards

**Always type:**
- Function parameters
- Return values
- Component props
- Redux state/actions

**Development-Friendly Approach:**
- `any` type is allowed for development flexibility
- `@ts-ignore` and `@ts-expect-error` are allowed when needed
- Type assertions are acceptable for development
- Focus on functionality over strict typing

**Use:**
- Interfaces for objects
- Type aliases for unions/primitives
- Generics for reusable components/functions
- `@ts-expect-error` with explanatory comments

### 7.1. Path Alias Priority

**NEVER use relative imports** - Always use path aliases:
- ✅ `@api` instead of `../../api` or `../api`
- ✅ `@store/hooks` instead of `../../store/hooks`
- ✅ `@hooks/useColorScheme` instead of `../../hooks/useColorScheme`
- ✅ `@constants/Colors` instead of `../../constants/Colors`
- ✅ `@components/ui/Themed` instead of `../../../components/ui/Themed`

This ensures consistent, maintainable imports across the entire codebase.

### 8. Git & Versioning Policy (CI‑driven)

- Version source of truth: `package.json`
- App version is read dynamically by `app.config.js` (no hardcoded string)
- Semantic bump is automatic on push to `master`/`main` based on the latest commit message:
  - `feat:` or `feature:` → minor bump (e.g., 0.5.0 → 0.6.0)
  - `fix:` or `bugfix:` → patch bump (e.g., 0.5.0 → 0.5.1)
  - Other prefixes (`ci:`, `docs:`, `chore:`, `refactor:`…) → build only, no version change
- APK metadata:
  - versionName = `package.json` version
  - versionCode = derived from semver or via `ANDROID_VERSION_CODE`
- Release notes: minimal (version, build, commit, date, install steps). No features/stack tables
- To force a bump: push a commit with `feat:` (minor) or `fix:` (patch)

### 9. Imports

**Always use path aliases instead of relative imports!**

**Good:**
```typescript
import { View } from '@components/ui/Themed';
import { useLoginMutation, useMeQuery, useAddMessageMutation } from '@api';
import { useAppDispatch, useAppSelector } from '@store/hooks';
import { login } from '@store/slices/authSlice';
import { useColorScheme } from '@hooks/useColorScheme';
import { colors } from '@constants/Colors';
import { client } from '@api';
import { persistor, store } from '@store';
```

Better (matches current aliases):
```typescript
import { useLoginMutation, useMeQuery, useAddMessageMutation } from '@api';
import { useColorScheme } from '@hooks/useColorScheme';
import { colors } from '@constants/Colors';
import { client } from '@api';
import { useAppDispatch } from '@/store/hooks';
import { login } from '@/store/slices/authSlice';
```

**Bad:**
```typescript
import { View } from '../../../components/ui/Themed';       // Use @components
import { useLoginMutation } from '../../api';              // Use @api
import { useAppDispatch } from '../../store/hooks';       // Use @store/hooks
import { login } from '../../store/slices/authSlice';        // Use @store/slices/authSlice
import { useColorScheme } from '../../hooks/useColorScheme';// Use @hooks
import { client } from '../api';                            // Use @api
```

### 10. Error Handling

**GraphQL Resolvers:**
```typescript
export const register = async (_, { username, password }, context) => {
  // Validate input
  if (!username || !password) {
    throw new Error('Username and password are required');
  }
  
  // Check existing
  const existing = await db.select()...;
  if (existing) {
    throw new Error('User already exists');
  }
  
  // Perform operation
  // ...
};
```

**Client Components:**
```typescript
const [mutate, { loading, error }] = useMutation(REGISTER_MUTATION);

if (error) return <ErrorDisplay error={error} />;
if (loading) return <LoadingSpinner />;
```

## Common Commands

```bash
# Development
yarn dev                  # Start both worker and client
yarn start                # Expo dev server only
yarn worker:dev           # Worker only

# GraphQL Codegen
yarn codegen              # Generate types and hooks from GraphQL schema
yarn codegen:watch        # Watch mode for development

# Database
yarn db:generate          # Generate migration from schema
yarn db:migrate           # Apply migrations to local D1
yarn db:studio            # Open Drizzle Studio

# Code Quality
yarn lint                 # Run ESLint with developer-friendly rules
yarn lint:fix             # Fix linting issues automatically
yarn format               # Format with Prettier (optional)

# Build
yarn android              # Run on Android
yarn ios                  # Run on iOS
yarn build:release        # EAS build for production

# Utilities
yarn clean                # Clear all caches
```

## File Naming Conventions

- Components: `PascalCase.tsx` (e.g., `AuthWrapper.tsx`)
- Hooks: `camelCase.ts` starting with 'use' (e.g., `useAuth.ts`)
- Utilities: `camelCase.ts` (e.g., `formatDate.ts`)
- Constants: `SCREAMING_SNAKE_CASE` inside files
- Types: Use descriptive interfaces (e.g., `interface UserProps`)

## Internationalization

**Using translations:**
```typescript
import { useTranslation } from 'react-i18next';

const { t } = useTranslation();
<Text>{t('common.welcome')}</Text>
```

**Translation files:**
- `locales/en/translation.json`
- `locales/fa/translation.json`

**RTL Support:**
- RTL layout toggling is currently disabled (Android `supportsRtl=false`)
- Translations work without forcing RTL layout
- Language switching works for English and Persian (Farsi)

## Key Configuration Files

**metro.config.js** - Metro bundler (CommonJS)
- Defines path aliases
- Adds .sql file support
- Configures resolver
- Integrates NativeWind with `withNativeWind()` wrapper
- Processes `global.css` for Tailwind

**eslint.config.mjs** - ESLint flat config (ES Module)
- TypeScript rules
- React/React Native rules
- Prettier integration
- **Must use .mjs extension** (package.json doesn't have "type": "module")

**wrangler.toml** - Cloudflare Workers
- D1 database binding
- Durable Objects for subscriptions
- Worker entry point: `worker/index.ts` (defined in `main` field)
- Development server on port 8787

**babel.config.js** - Babel configuration
- Expo preset with NativeWind JSX import source
- NativeWind Babel preset for Tailwind processing
- React Native Reanimated plugin
- React Native Worklets plugin (must be last)

**tailwind.config.js** - Tailwind CSS configuration
- NativeWind preset for React Native
- Class-based dark mode enabled
- Custom colors (primary, danger, success, neutral)
- Custom font families (Outfit variants)
- Content paths: `app/**/*.{js,jsx,ts,tsx}`, `components/**/*.{js,jsx,ts,tsx}`

**global.css** - Tailwind directives
- `@tailwind base` - Base styles
- `@tailwind components` - Component classes
- `@tailwind utilities` - Utility classes
- Imported in `app/_layout.tsx` for global availability

**drizzle.config.ts** - Database (Worker)
- Schema location: `database/schema.ts` (exports `serverSchema` as `schema` for migrations)
- Migrations: `migrations/` (at project root, for D1 database)
- Dialect: SQLite

**database/** - Shared Drizzle Schema
- `schema.ts` - Unified schema with UUIDs (server + client tables in one file)
- `server.ts` - Server adapter: `getServerDB(d1)` for Cloudflare D1
- `client.ts` - Client adapter: `getLocalDB()` for Expo SQLite, sync utilities, stats
- `index.ts` - Main exports (re-exports from schema, server, client)
- `utils.ts` - UUID utilities (createId, isValidId) - runtime-optimized for each platform
- Client uses expo-sqlite, auto-migrated on initialization

## Critical Rules

1. **Never add `"type": "module"` to package.json** - causes metro.config.js to fail
2. **Use eslint.config.mjs** - ES module config works without "type": "module"
3. **Perfect Separation**: GraphQL folder is shared, API folder is client-only, Worker folder is server-only, `database/schema.ts` is SHARED between client and worker (unified schema with separate adapters)
4. **GraphQL Codegen**: Always run `yarn codegen` after modifying schema or operations
5. **Worker code is server-only** - Never import from client code
6. **Use path aliases** - Avoid relative imports
7. **Styling with NativeWind**: Use Tailwind CSS classes via `className` prop, not inline styles
8. **Run db:migrate before testing** - Ensure schema is up to date
9. **Clean caches when stuck** - `yarn clean` fixes most issues
10. **Developer-Friendly TypeScript**: Use `any` type and `@ts-expect-error` when needed for development
11. **Auto-Generated Files**: Never manually edit `api/hooks.ts` or `api/types.ts`
12. **Worker Entry Point**: Cloudflare Worker entry is `worker/index.ts` (defined in wrangler.toml `main` field)

## Debugging Tips

**Metro bundler issues:**
- Run `yarn clean`
- Delete `.expo` and `node_modules/.cache`
- Restart with `yarn start --clear`

**Worker issues:**
- Check `.wrangler/state/v3/d1/` for database
- Run `yarn db:migrate` to reset database
- Check wrangler logs in terminal

**Type errors:**
- Ensure shared types are in `graphql/schema.graphql`
- Check tsconfig.json path aliases
- Run `npx tsc --noEmit` to see all errors
- Run `yarn codegen` to regenerate types

**GraphQL errors:**
- Check worker terminal for resolver errors
- Verify schema matches resolvers
- Test in GraphiQL at `http://localhost:8787/graphql`
- Run `yarn codegen` after schema changes

**API/Client errors:**
- Check if `api/hooks.ts` and `api/types.ts` are up to date
- Run `yarn codegen` to regenerate client code
- Verify imports are using correct paths

## Security Considerations

- **Passwords**: PBKDF2 with 100k iterations (see `worker/utils.ts`)
- **Tokens**: SHA-256 based, include timestamp
- **Validation**: Always validate input in resolvers
- **SQL Injection**: Drizzle ORM prevents this automatically
- **XSS**: React Native escapes by default

## Performance Tips

- Use `React.memo` for expensive components
- Use `useCallback` for functions passed as props
- Use `useMemo` for expensive calculations
- Keep Redux state minimal
- Use Apollo Client cache effectively

## When in Doubt

1. Check existing patterns in similar files
2. Use path aliases (`@/`, `@components/`, `@graphql/`)
3. Type everything strictly with enhanced checking
4. Run linter before committing
5. Test both online and offline scenarios
6. Test language switching (English/Persian)
7. Run `yarn codegen` after GraphQL changes
8. Never manually edit auto-generated files

## Feature Development Workflow

### Adding New GraphQL Operations

1. **Define Schema**: Add types to `graphql/schema.graphql`
2. **Create Operations**: Add `.graphql` files to `graphql/queries/`
3. **Generate Code**: Run `yarn codegen` (auto-generates hooks in `api/hooks.ts`)
4. **Create Resolvers**: Add resolver functions to `worker/mutations/` or `worker/queries/`
5. **Use in Components**: Import generated hooks directly from `api/` (e.g., `import { useLoginMutation } from 'api'`)

### Adding New Database Tables

**For Server (Worker):**
1. **Update Unified Schema**: Add server table to `database/schema.ts` (e.g., `users`, `trips`, `tours`)
   - Use UUID (text) IDs: `text('id').primaryKey().$defaultFn(() => createId())`
   - Add to `serverSchema` export
2. **Generate Migration**: Run `yarn db:generate` (from `database/schema.ts`)
3. **Apply Migration**: Run `yarn db:migrate` (for D1 database)
4. **Update GraphQL Schema**: Add types to `graphql/schema.graphql` if exposing data to client
5. **Generate Client Code**: Run `yarn codegen` to create client hooks

**For Client Cached Tables (if needed):**
1. **Update Unified Schema**: Add cached table to `database/schema.ts` (e.g., `cachedUsers`, `cachedTrips`)
   - Reuse shared field definitions from server tables via spread operator
   - Add sync metadata: `cachedAt`, `lastSyncAt`, `pending`, `deletedAt`
   - Add to `clientSchema` export
2. **Client auto-migration**: Tables created automatically on app initialization (see `database/client.ts`)
3. **Automatic Sync**: Apollo cache automatically syncs to new cached tables via `DrizzleCacheStorage` (no manual sync needed)

**Key Points:**
- All tables use UUID (text) IDs for consistency
- Server and client tables are defined in the same `database/schema.ts` file
- Server uses `getServerDB(d1)` from `@database/server`
- Client uses `getLocalDB()` from `@database/client`
- Both import from the same schema file, ensuring perfect consistency

### Adding New UI Components

1. **Create Component**: Add to `components/ui/` or `components/`
2. **Add Types**: Define TypeScript interfaces
3. **Add Translations**: Update `locales/en/` and `locales/fa/`
4. **Test Language Switching**: Ensure translations work in both English and Persian

---

**Remember**: This is a unified monorepo with perfect separation. GraphQL folder is shared, API folder is client-only, Worker folder is server-only, `database/schema.ts` is SHARED between client and worker (unified schema with separate adapters). Always run `yarn codegen` after GraphQL changes and never manually edit auto-generated files. Use `@database/server` for worker resolvers and `@database/client` for client components.