# React Query Setup - Complete

This document summarizes the React Query implementation added to the Black Canyon Tickets React rebuild project.

## What Was Implemented

### 1. QueryClient Provider Setup
- **File**: `src/app/providers.tsx`
- **QueryClient Configuration**:
  - `retry: 1` - Retry failed requests once
  - `staleTime: 30_000` - Data stays fresh for 30 seconds
  - `gcTime: 600_000` - Data cached in memory for 10 minutes
  - `refetchOnWindowFocus: false` - Don't refetch when window regains focus
- **Development Tools**: React Query DevTools enabled in development mode
- **Helper Functions**: `invalidate()`, `getCachedData()`, `setCachedData()` for cache management

### 2. Provider Integration
- **File**: `src/App.tsx`
- Added `QueryProvider` to the provider stack, wrapping the entire application
- Properly positioned in provider hierarchy for optimal context access

### 3. Converted Hooks to React Query

#### 3.1 useCheckout Hook
- **File**: `src/hooks/useCheckout.ts`
- **Converted from**: Raw fetch calls with manual state management
- **Converted to**: React Query mutation with automatic error handling
- **Usage**: `const checkoutMutation = useCheckout()`

#### 3.2 useRefunds Hook
- **File**: `src/hooks/useRefunds.ts` (new)
- **Purpose**: Handle refund creation with React Query mutations
- **Usage**: `const refundMutation = useCreateRefund()`

#### 3.3 useTicketVerification Hook
- **File**: `src/hooks/useTicketVerification.ts` (new)
- **Purpose**: Handle QR ticket verification with React Query mutations
- **Usage**: `const verificationMutation = useTicketVerification()`

#### 3.4 useOrders Hook
- **File**: `src/hooks/useOrders.ts` (new)
- **Purpose**: Fetch order details with caching and retry logic
- **Usage**: `const orderQuery = useOrder(orderId)`

### 4. Updated Components

#### 4.1 TicketPurchase Component
- **File**: `src/components/checkout/TicketPurchase.tsx`
- **Updated**: Converted to use `useCheckout()` React Query mutation
- **Benefits**: Better loading states, error handling, and automatic retries

#### 4.2 StripeConnectButton Component
- **File**: `src/components/billing/StripeConnectButton.tsx`
- **Fixed**: Type errors related to error handling

### 5. Documentation and Examples

#### 5.1 ReactQueryExample Component
- **File**: `src/components/examples/ReactQueryExample.tsx`
- **Purpose**: Complete usage examples for all React Query hooks
- **Demonstrates**: Queries, mutations, error handling, cache invalidation

#### 5.2 Hooks Index
- **File**: `src/hooks/index.ts`
- **Purpose**: Centralized exports for all hooks and utilities
- **Includes**: Clear separation between React Query hooks and context hooks

## Usage Examples

### Basic Query
```typescript
import { useOrder } from '../hooks';

const { data, isLoading, error, refetch } = useOrder(orderId);
```

### Basic Mutation
```typescript
import { useCheckout } from '../hooks';

const checkoutMutation = useCheckout();

const handlePurchase = () => {
  checkoutMutation.mutate({
    orgId: 'org_123',
    eventId: 'event_456',
    ticketTypeId: 'tt_789',
    quantity: 2,
    customerEmail: 'user@example.com'
  });
};
```

### Cache Management
```typescript
import { invalidate } from '../hooks';

// Invalidate specific data
invalidate(['order', orderId]);

// Invalidate all events
invalidate('events');
```

## Benefits Achieved

### 1. Performance Improvements
- **Automatic Caching**: 30-second stale time reduces unnecessary requests
- **Background Refetching**: Data stays current without blocking UI
- **Memory Management**: 10-minute garbage collection prevents memory leaks

### 2. Better Developer Experience
- **DevTools**: Visual query inspection in development
- **TypeScript Support**: Full type safety with mutations and queries
- **Consistent API**: All server state uses the same patterns

### 3. Improved Error Handling
- **Automatic Retries**: Failed requests retry once by default
- **Error States**: Consistent error handling across all components
- **Loading States**: Built-in loading states with `isPending`/`isFetching`

### 4. Cache Optimization
- **Intelligent Invalidation**: Refresh related data after mutations
- **Optimistic Updates**: Support for immediate UI updates
- **Background Sync**: Keep data fresh without user intervention

## Migration Notes

### What Changed
- Raw fetch calls → React Query mutations
- Manual loading states → Automatic `isPending` states  
- Manual error handling → Automatic error states
- No caching → Intelligent caching with invalidation

### What Stayed the Same
- Component interfaces remain unchanged
- Error handling patterns consistent with existing code
- All existing functionality preserved

### Legacy Support
- Store-based hooks (Zustand) remain unchanged
- Context-based hooks (auth, theme) work alongside React Query
- Existing components continue to work without modification

## Next Steps

### Recommended Enhancements
1. **Add more queries**: Convert remaining fetch calls to React Query
2. **Implement optimistic updates**: For better perceived performance
3. **Add background sync**: Keep data fresh when app regains focus
4. **Cache persistence**: Save query cache to localStorage for offline support

### Monitoring
- Use React Query DevTools to monitor query performance
- Watch for excessive refetching or cache misses
- Monitor bundle size impact (current overhead is minimal)

## Configuration

The default configuration is optimized for the Black Canyon Tickets use case:
- **Short stale time (30s)**: Ticket data changes frequently
- **Medium cache time (10min)**: Balance between performance and memory usage
- **Single retry**: Avoid hammering APIs while handling transient failures
- **No focus refetch**: Prevent unnecessary requests during normal usage

All configuration can be adjusted in `src/app/providers.tsx` as needed.