@dataql/react-native/IMPLEMENTATION_STATUS.md

DataQL React Native SDK with offline-first capabilities and clean API

# DataQL React Native SDK - Implementation Status

## Overview

This document outlines the current implementation status of the `@dataql/react-native` package, an offline-first React Native SDK for DataQL with automatic synchronization using Drizzle ORM and Expo SQLite.

## ✅ Completed Components

### 1. Package Structure and Configuration

- ✅ Package.json with proper dependencies and peer dependencies
- ✅ TypeScript configuration (tsconfig.json)
- ✅ Drizzle configuration for Expo SQLite (drizzle.config.ts)
- ✅ Comprehensive README documentation
- ✅ Complete example usage implementation

### 2. Database Layer

- ✅ Database schema design with Drizzle ORM
  - Offline operations table
  - Sync metadata table
  - Cached data table
  - Sync conflicts table
  - App settings table
- ✅ Database client implementation
- ✅ Type definitions for all schema entities

### 3. Core Architecture

- ✅ **OfflineCacheManager**: Complete implementation for local data operations
  - Create, update, delete operations with offline queueing
  - Local data querying
  - Sync status management
  - Operation tracking and error handling
- ✅ **SyncManager**: Complete implementation for data synchronization

  - Background sync with configurable intervals
  - Network status monitoring
  - Event-driven sync operations
  - Conflict detection and resolution
  - Retry logic with exponential backoff
  - Integration with worker infrastructure
  - Custom network transport support (compatible with Core SDK)

- ✅ **DataQLClient**: Main client orchestrating all functionality
  - Initialization and configuration
  - Unified API for all operations
  - Lifecycle management

### 4. React Integration

- ✅ **React Hooks**: Complete implementation
  - `useQuery`: Offline-first data querying
  - `useMutation`: Create, update, delete operations
  - `useSync`: Sync management and status
  - `useNetworkStatus`: Network connectivity monitoring
  - `useLiveQuery`: Real-time data updates (partial)

### 5. TypeScript Support

- ✅ Comprehensive type definitions
- ✅ Type-safe database operations
- ✅ Proper generic type support for data operations

### 6. Network Transport

- ✅ **Custom Connection Support**: Compatible with Core SDK's network transport pattern
  - CustomRequestConnection interface for routing requests through other SDKs
  - Legacy WorkerBinding interface for backward compatibility
  - Priority-based connection resolution (custom → workerBinding → fetch)
  - Consistent network transport API across Core and React Native SDKs

### 7. Documentation and Examples

- ✅ Complete README with installation and usage instructions
- ✅ Comprehensive example implementation showing all features
- ✅ API reference documentation
- ✅ Configuration options documentation
- ✅ Best practices and troubleshooting guide

## ⚠️ Known Issues and Limitations

### 1. Build Configuration

- **Issue**: TypeScript compilation errors due to peer dependencies not being available during build
- **Affected**: React, React Native, Expo SQLite imports
- **Status**: Requires runtime availability of peer dependencies
- **Workaround**: Package should be used in React Native projects with proper dependencies installed

### 2. Live Queries Implementation

- **Issue**: Drizzle live query integration needs refinement for dynamic table queries
- **Status**: Basic implementation complete, needs table-specific optimization
- **Impact**: Live queries work but may need manual schema setup per table

### 3. Migration System

- **Issue**: Migration file bundling requires proper Babel configuration
- **Status**: Configuration documented, requires user setup
- **Impact**: Users must configure Babel and Metro properly

## 🔄 Required User Setup

### 1. Dependencies Installation

```bash
npm install @dataql/react-native drizzle-orm expo-sqlite@next
npm install -D drizzle-kit babel-plugin-inline-import
```

### 2. Babel Configuration

```javascript
// babel.config.js
module.exports = function (api) {
  api.cache(true);
  return {
    presets: ["babel-preset-expo"],
    plugins: [["inline-import", { extensions: [".sql"] }]],
  };
};
```

### 3. Metro Configuration

```javascript
// metro.config.js
const { getDefaultConfig } = require("expo/metro-config");
const config = getDefaultConfig(__dirname);
config.resolver.sourceExts.push("sql");
module.exports = config;
```

## 🚀 Usage Pattern

```typescript
import { DataQLClient, createDefaultConfig, useQuery, useMutation } from '@dataql/react-native';

// Initialize client
const config = createDefaultConfig('https://your-worker-url.com/api');
const client = new DataQLClient(config);

// Use in React components
function MyComponent() {
  const { data, loading } = useQuery('users');
  const { create, update, delete: remove } = useMutation();

  // All operations work offline-first
  const handleCreate = () => create('users', { name: 'John' });

  return (
    <View>
      {data.map(user => <Text key={user.id}>{user.name}</Text>)}
    </View>
  );
}
```

## 🔧 Integration with Existing DataQL Infrastructure

### Worker Integration

- ✅ HTTP API calls to worker endpoints
- ✅ REST-style operations (GET, POST, PUT, DELETE)
- ✅ Configurable worker URL and endpoints
- ✅ Automatic retry and error handling

### Serverless Integration

- ✅ Compatible with existing serverless infrastructure
- ✅ Sync operations map to serverless function endpoints
- ✅ Support for different regions and environments

### Core Package Integration

- ✅ Uses @dataql/core as dependency
- ✅ Consistent type definitions and interfaces
- ✅ Shared utilities and configurations

## 📋 Testing and Validation Needed

1. **Real Device Testing**: Test on actual React Native/Expo apps
2. **Network Scenarios**: Validate offline/online transitions
3. **Performance Testing**: Large dataset sync performance
4. **Conflict Resolution**: Test concurrent modification scenarios
5. **Memory Management**: Ensure proper cleanup and resource management

## 🎯 Next Steps

1. **Resolve Build Issues**: Fix TypeScript compilation in isolated environments
2. **Enhanced Live Queries**: Improve dynamic table query support
3. **Performance Optimization**: Optimize for large datasets
4. **Testing Suite**: Add comprehensive unit and integration tests
5. **Documentation**: Add more examples and use cases

## 🏗️ Architecture Highlights

The SDK implements a sophisticated offline-first architecture:

1. **Local SQLite Storage**: All data stored locally with Expo SQLite
2. **Operation Queue**: Changes tracked and queued for sync
3. **Intelligent Sync**: Background sync with conflict resolution
4. **React Integration**: Seamless hooks for React Native apps
5. **Type Safety**: Full TypeScript support throughout
6. **Event System**: Real-time updates and sync notifications

This implementation provides a solid foundation for offline-first React Native apps with DataQL integration.