# Statistics Caching System

## Overview
The Statistics Caching system provides efficient caching and retrieval of statistics across all levels of the theme park hierarchy. It implements a robust caching strategy with automatic invalidation, cache warming, and performance monitoring.

## Components

### 1. Cache Structure

#### Key Prefixes
```php
protected const AREA_PREFIX = 'stats:area:';
protected const PARK_PREFIX = 'stats:park:';
protected const OPERATOR_PREFIX = 'stats:operator:';
```

#### Cache TTL
```php
protected const CACHE_TTL = 86400; // 24 hours
```

### 2. StatisticsCacheService
Located in `app/Services/StatisticsCacheService.php`

Purpose:
- Manage statistics caching
- Handle cache invalidation
- Provide cache warming
- Monitor cache performance

Features:
1. Caching Operations
   - Area statistics
   - Park rollups
   - Operator aggregates
   - Batch processing

2. Cache Management
   - Automatic invalidation
   - Selective updates
   - Cache warming
   - Error handling

## Implementation Details

### Area Statistics Cache
```php
[
    'ride_distribution' => [
        'coasters' => 5,
        'flat_rides' => 12,
        'water_rides' => 3,
    ],
    'daily_capacity' => '25,000 riders/day',
    'rating' => '★★★★☆ (4.2)',
    'wait_time' => '45 minutes',
    'historical' => [
        'total_operated' => 25,
        'retired_count' => 5,
        'last_addition' => 'Mar 2024',
    ],
    'updated_at' => '2024-02-23 19:30:00',
]
```

### Park Statistics Cache
```php
[
    'area_distribution' => [
        'total' => 8,
        'operating' => 7,
        'closed' => 1,
    ],
    'ride_distribution' => [
        'coasters' => 12,
        'flat_rides' => 35,
        'water_rides' => 8,
    ],
    'daily_capacity' => '75,000 riders/day',
    'rating' => '★★★★★ (4.8)',
    'wait_time' => '35 minutes',
    'historical' => [...],
    'performance' => [
        'utilization' => '85%',
        'peak_attendance' => '65,000',
        'satisfaction' => '4.5/5.0',
    ],
    'updated_at' => '2024-02-23 19:30:00',
]
```

### Operator Statistics Cache
```php
[
    'park_count' => 5,
    'operating_parks' => 4,
    'closed_parks' => 1,
    'total_rides' => 275,
    'total_coasters' => 45,
    'average_rating' => 4.6,
    'total_capacity' => 350000,
    'updated_at' => '2024-02-23 19:30:00',
]
```

## Cache Management

### 1. Invalidation Strategy
- Automatic invalidation on updates
- Cascading invalidation
- Selective cache clearing
- Error handling

### 2. Cache Warming
```php
public function warmCaches(): void
{
    // Process areas in chunks
    ParkArea::chunk(100, function ($areas) {
        foreach ($areas as $area) {
            $this->cacheAreaStatistics($area);
        }
    });

    // Process parks in chunks
    Park::chunk(100, function ($parks) {...});

    // Process operators in chunks
    Operator::chunk(100, function ($operators) {...});
}
```

### 3. Error Handling
```php
try {
    Cache::put($key, $data, static::CACHE_TTL);
    Log::info("Cached statistics for {$type} {$id}");
} catch (\Exception $e) {
    Log::error("Failed to cache statistics: {$e->getMessage()}");
}
```

## Performance Optimization

### 1. Cache Design
- Efficient key structure
- Optimized data format
- Minimal cache churn
- Batch operations

### 2. Memory Usage
- Compact data storage
- Selective caching
- TTL management
- Cache size monitoring

### 3. Invalidation Rules
- Smart invalidation
- Dependency tracking
- Cascade control
- Version management

## Future Enhancements
1. [ ] Add Redis support
2. [ ] Implement cache tags
3. [ ] Add cache versioning
4. [ ] Create cache analytics
5. [ ] Add cache preloading
6. [ ] Implement cache pruning
7. [ ] Add cache monitoring
8. [ ] Create cache dashboard

## Integration Points
1. Statistics System
   - Data aggregation
   - Cache updates
   - Performance metrics

2. Event System
   - Cache invalidation
   - Update triggers
   - Error handling

3. Monitoring System
   - Cache hit rates
   - Performance tracking
   - Error logging

## Security Considerations
1. Data Protection
   - Cache encryption
   - Access control
   - Data validation

2. Error Handling
   - Graceful degradation
   - Fallback mechanisms
   - Error logging

## Testing Strategy
1. Unit Tests
   - [ ] Cache operations
   - [ ] Invalidation rules
   - [ ] Error handling

2. Integration Tests
   - [ ] Cache warming
   - [ ] Update propagation
   - [ ] Performance tests

3. Load Tests
   - [ ] Cache hit rates
   - [ ] Memory usage
   - [ ] Concurrent access

## Monitoring
1. Performance Metrics
   - [ ] Cache hit rates
   - [ ] Response times
   - [ ] Memory usage

2. Error Tracking
   - [ ] Failed operations
   - [ ] Invalid data
   - [ ] System alerts

3. Usage Analytics
   - [ ] Access patterns
   - [ ] Data freshness
   - [ ] Cache efficiency