solana-recover 1.1.3

//! # NFT Caching and Performance Optimization System
//!
//! Ultra-fast multi-tier caching with intelligent eviction, compression,
//! performance monitoring, and adaptive optimization strategies.

use crate::nft::errors::{NftError, NftResult};
use crate::nft::types::*;
use crate::nft::valuation::ValuationResult;
use crate::nft::security::SecurityValidationResult;
use dashmap::DashMap;
use moka::future::Cache as MokaCache;
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::sync::Arc;
use std::time::{Duration, Instant};
use tokio::sync::RwLock;
use tracing::{debug, info, warn};

/// Comprehensive cache manager for NFT operations
#[derive(Clone)]
pub struct CacheManager {
    /// L1 cache - hot data with Moka
    l1_cache: Arc<MokaCache<CacheKey, CacheEntry>>,
    
    /// L2 cache - warm data with DashMap
    l2_cache: Arc<DashMap<CacheKey, CacheEntry>>,
    
    /// Cache configuration
    config: CacheConfig,
    
    /// Performance metrics
    metrics: Arc<CacheMetrics>,
    
    /// Compression engine
    compression: Arc<CompressionEngine>,
    
    /// Eviction policy manager
    eviction_manager: Arc<EvictionManager>,
    
    /// Cache warmer
    cache_warmer: Arc<CacheWarmer>,
}

/// Cache configuration
#[derive(Debug, Clone)]
pub struct CacheConfig {
    /// L1 cache size (number of entries)
    pub l1_max_entries: u64,
    
    /// L2 cache size (number of entries)
    pub l2_max_entries: u64,
    
    /// L1 TTL in seconds
    pub l1_ttl_seconds: u64,
    
    /// L2 TTL in seconds
    pub l2_ttl_seconds: u64,
    
    /// Enable compression for large entries
    pub enable_compression: bool,
    
    /// Compression threshold in bytes
    pub compression_threshold_bytes: usize,
    
    /// Enable intelligent eviction
    pub enable_intelligent_eviction: bool,
    
    /// Enable cache warming
    pub enable_cache_warming: bool,
    
    /// Enable metrics collection
    pub enable_metrics: bool,
    
    /// Background cleanup interval in seconds
    pub cleanup_interval_seconds: u64,
    
    /// Maximum memory usage in MB
    pub max_memory_mb: u64,
    
    /// Cache hit ratio target (0-1)
    pub hit_ratio_target: f64,
}

impl Default for CacheConfig {
    fn default() -> Self {
        Self {
            l1_max_entries: 10000,
            l2_max_entries: 50000,
            l1_ttl_seconds: 300,  // 5 minutes
            l2_ttl_seconds: 1800, // 30 minutes
            enable_compression: true,
            compression_threshold_bytes: 1024, // 1KB
            enable_intelligent_eviction: true,
            enable_cache_warming: true,
            enable_metrics: true,
            cleanup_interval_seconds: 60, // 1 minute
            max_memory_mb: 512, // 512MB
            hit_ratio_target: 0.8,
        }
    }
}

/// Cache performance metrics
#[derive(Debug, Default)]
pub struct CacheMetrics {
    /// Total cache requests
    pub total_requests: Arc<std::sync::atomic::AtomicU64>,
    
    /// L1 cache hits
    pub l1_hits: Arc<std::sync::atomic::AtomicU64>,
    
    /// L2 cache hits
    pub l2_hits: Arc<std::sync::atomic::AtomicU64>,
    
    /// Cache misses
    pub misses: Arc<std::sync::atomic::AtomicU64>,
    
    /// Evictions
    pub evictions: Arc<std::sync::atomic::AtomicU64>,
    
    /// Compressions performed
    pub compressions: Arc<std::sync::atomic::AtomicU64>,
    
    /// Decompressions performed
    pub decompressions: Arc<std::sync::atomic::AtomicU64>,
    
    /// Memory usage in bytes
    pub memory_usage_bytes: Arc<std::sync::atomic::AtomicU64>,
    
    /// Average access time in microseconds
    pub avg_access_time_us: Arc<std::sync::atomic::AtomicU64>,
    
    /// Cache size (number of entries)
    pub cache_size: Arc<std::sync::atomic::AtomicU64>,
    
    /// Hit ratio (0-1)
    pub hit_ratio: Arc<std::sync::atomic::AtomicF64>,
    
    /// Metrics by cache type
    pub metrics_by_type: Arc<DashMap<CacheEntryType, TypeMetrics>>,
}

/// Metrics by cache entry type
#[derive(Debug, Default)]
pub struct TypeMetrics {
    /// Requests for this type
    pub requests: u64,
    
    /// Hits for this type
    pub hits: u64,
    
    /// Misses for this type
    pub misses: u64,
    
    /// Average size for this type
    pub avg_size_bytes: f64,
}

/// Cache key
#[derive(Debug, Clone, Hash, PartialEq, Eq, Serialize, Deserialize)]
pub struct CacheKey {
    /// Key type
    pub key_type: CacheKeyType,
    
    /// Key value
    pub value: String,
    
    /// Additional namespace
    pub namespace: Option<String>,
    
    /// Version for cache invalidation
    pub version: Option<u32>,
}

/// Cache key types
#[derive(Debug, Clone, Hash, PartialEq, Eq, Serialize, Deserialize)]
pub enum CacheKeyType {
    /// NFT metadata
    NftMetadata,
    /// NFT valuation
    NftValuation,
    /// Security validation
    SecurityValidation,
    /// Collection data
    CollectionData,
    /// Market data
    MarketData,
    /// Image data
    ImageData,
    /// Custom key type
    Custom { type_name: String },
}

/// Cache entry with metadata
#[derive(Debug, Clone)]
pub struct CacheEntry {
    /// Entry type
    pub entry_type: CacheEntryType,
    
    /// Entry data
    pub data: CacheEntryData,
    
    /// Creation timestamp
    pub created_at: chrono::DateTime<chrono::Utc>,
    
    /// Last access timestamp
    pub last_accessed: Arc<RwLock<chrono::DateTime<chrono::Utc>>>,
    
    /// Access count
    pub access_count: Arc<std::sync::atomic::AtomicU64>,
    
    /// Size in bytes
    pub size_bytes: usize,
    
    /// Is compressed
    pub compressed: bool,
    
    /// Priority score for eviction
    pub priority_score: Arc<RwLock<f64>>,
    
    /// TTL in seconds
    pub ttl_seconds: u64,
}

/// Cache entry types
#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub enum CacheEntryType {
    NftInfo,
    ValuationResult,
    SecurityValidationResult,
    CollectionInfo,
    MarketData,
    ImageData,
    Custom { type_name: String },
}

/// Cache entry data
#[derive(Debug, Clone)]
pub enum CacheEntryData {
    /// NFT information
    NftInfo(NftInfo),
    /// Valuation result
    ValuationResult(ValuationResult),
    /// Security validation result
    SecurityValidationResult(SecurityValidationResult),
    /// Collection information
    CollectionInfo(CollectionInfo),
    /// Market data
    MarketData(crate::nft::valuation::MarketData),
    /// Image data (bytes)
    ImageData(Vec<u8>),
    /// JSON data
    JsonData(serde_json::Value),
    /// Raw bytes
    RawBytes(Vec<u8>),
    /// Custom data
    Custom { type_name: String, data: Vec<u8> },
}

/// Compression engine
#[derive(Clone)]
pub struct CompressionEngine {
    /// Enable compression
    enabled: bool,
    
    /// Compression threshold
    threshold_bytes: usize,
    
    /// Compression algorithm
    algorithm: CompressionAlgorithm,
}

/// Compression algorithms
#[derive(Debug, Clone)]
pub enum CompressionAlgorithm {
    Gzip,
    Lz4,
    Zstd,
}

/// Eviction policy manager
#[derive(Clone)]
pub struct EvictionManager {
    /// Policy configuration
    policy: EvictionPolicy,
    
    /// Eviction statistics
    stats: Arc<EvictionStats>,
}

/// Eviction policies
#[derive(Debug, Clone)]
pub enum EvictionPolicy {
    /// Least Recently Used
    LRU,
    /// Least Frequently Used
    LFU,
    /// Time-based expiration
    TimeBased,
    /// Size-based eviction
    SizeBased,
    /// Adaptive eviction
    Adaptive { weights: HashMap<EvictionFactor, f64> },
}

/// Eviction factors for adaptive policy
#[derive(Debug, Clone, Hash, PartialEq, Eq)]
pub enum EvictionFactor {
    AccessFrequency,
    Recency,
    Size,
    Age,
    Priority,
}

/// Eviction statistics
#[derive(Debug, Default)]
pub struct EvictionStats {
    /// Total evictions
    pub total_evictions: Arc<std::sync::atomic::AtomicU64>,
    
    /// Evictions by reason
    pub evictions_by_reason: Arc<DashMap<EvictionReason, u64>>,
    
    /// Evictions by entry type
    pub evictions_by_type: Arc<DashMap<CacheEntryType, u64>>,
    
    /// Memory recovered in bytes
    pub memory_recovered_bytes: Arc<std::sync::atomic::AtomicU64>,
}

/// Eviction reasons
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum EvictionReason {
    Expired,
    SizeLimit,
    MemoryLimit,
    LowPriority,
    Manual,
}

/// Cache warmer for proactive loading
#[derive(Clone)]
pub struct CacheWarmer {
    /// Warming configuration
    config: CacheWarmingConfig,
    
    /// Warming statistics
    stats: Arc<WarmingStats>,
}

/// Cache warming configuration
#[derive(Debug, Clone)]
pub struct CacheWarmingConfig {
    /// Enable warming
    pub enabled: bool,
    
    /// Warming interval in seconds
    pub interval_seconds: u64,
    
    /// Maximum items to warm per interval
    pub max_items_per_interval: usize,
    
    /// Warming strategies
    pub strategies: Vec<WarmingStrategy>,
}

/// Warming strategies
#[derive(Debug, Clone)]
pub enum WarmingStrategy {
    /// Warm popular items
    PopularItems { threshold: u64 },
    /// Warm recently accessed items
    RecentlyAccessed { time_window_minutes: u64 },
    /// Warm high-value items
    HighValueItems { min_value_lamports: u64 },
    /// Warm verified collections
    VerifiedCollections,
    /// Custom warming strategy
    Custom { strategy_name: String, config: serde_json::Value },
}

/// Warming statistics
#[derive(Debug, Default)]
pub struct WarmingStats {
    /// Items warmed
    pub items_warmed: Arc<std::sync::atomic::AtomicU64>,
    
    /// Warming successes
    pub warming_successes: Arc<std::sync::atomic::AtomicU64>,
    
    /// Warming failures
    pub warming_failures: Arc<std::sync::atomic::AtomicU64>,
    
    /// Time spent warming in milliseconds
    pub warming_time_ms: Arc<std::sync::atomic::AtomicU64>,
}

impl CacheManager {
    /// Create new cache manager
    pub fn new(config: CacheConfig) -> Self {
        let metrics = Arc::new(CacheMetrics::default());
        let compression = Arc::new(CompressionEngine::new(
            config.enable_compression,
            config.compression_threshold_bytes,
        ));
        let eviction_manager = Arc::new(EvictionManager::new(EvictionPolicy::Adaptive {
            weights: [
                (EvictionFactor::AccessFrequency, 0.3),
                (EvictionFactor::Recency, 0.3),
                (EvictionFactor::Size, 0.2),
                (EvictionFactor::Age, 0.1),
                (EvictionFactor::Priority, 0.1),
            ].into_iter().collect(),
        }));
        let cache_warmer = Arc::new(CacheWarmer::new(CacheWarmingConfig::default()));

        // Initialize L1 cache with Moka
        let l1_cache = Arc::new(
            MokaCache::builder()
                .max_capacity(config.l1_max_entries)
                .time_to_live(Duration::from_secs(config.l1_ttl_seconds))
                .build()
        );

        // Initialize L2 cache with DashMap
        let l2_cache = Arc::new(DashMap::new());

        let cache_manager = Self {
            l1_cache,
            l2_cache,
            metrics,
            compression,
            eviction_manager,
            cache_warmer,
            config,
        };

        // Start background tasks if enabled
        if cache_manager.config.enable_intelligent_eviction {
            cache_manager.start_eviction_task();
        }

        if cache_manager.config.enable_cache_warming {
            cache_manager.start_warming_task();
        }

        cache_manager
    }

    /// Get NFT from cache
    pub async fn get_nft(&self, key: &CacheKey) -> Option<NftInfo> {
        let start_time = Instant::now();
        self.metrics.total_requests.fetch_add(1, std::sync::atomic::Ordering::Relaxed);

        // Try L1 cache first
        if let Some(entry) = self.l1_cache.get(key).await {
            self.metrics.l1_hits.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
            self.update_access_stats(&entry).await;
            
            let access_time_us = start_time.elapsed().as_micros() as u64;
            self.metrics.avg_access_time_us.fetch_add(access_time_us, std::sync::atomic::Ordering::Relaxed);
            
            match &entry.data {
                CacheEntryData::NftInfo(nft_info) => return Some(nft_info.clone()),
                _ => warn!("Cache entry type mismatch for key {:?}", key),
            }
        }

        // Try L2 cache
        if let Some(entry) = self.l2_cache.get(key) {
            self.metrics.l2_hits.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
            self.update_access_stats(&entry).await;
            
            // Promote to L1 cache
            self.l1_cache.insert(key.clone(), entry.clone()).await;
            
            let access_time_us = start_time.elapsed().as_micros() as u64;
            self.metrics.avg_access_time_us.fetch_add(access_time_us, std::sync::atomic::Ordering::Relaxed);
            
            match &entry.data {
                CacheEntryData::NftInfo(nft_info) => return Some(nft_info.clone()),
                _ => warn!("Cache entry type mismatch for key {:?}", key),
            }
        }

        // Cache miss
        self.metrics.misses.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
        self.update_type_metrics(CacheEntryType::NftInfo, false).await;
        
        None
    }

    /// Set NFT in cache
    pub async fn set_nft(&self, key: &CacheKey, nft_info: &NftInfo) {
        let serialized_size = serde_json::to_vec(nft_info).unwrap_or_default().len();
        
        let entry = CacheEntry {
            entry_type: CacheEntryType::NftInfo,
            data: CacheEntryData::NftInfo(nft_info.clone()),
            created_at: chrono::Utc::now(),
            last_accessed: Arc::new(RwLock::new(chrono::Utc::now())),
            access_count: Arc::new(std::sync::atomic::AtomicU64::new(1)),
            size_bytes: serialized_size,
            compressed: false,
            priority_score: Arc::new(RwLock::new(1.0)),
            ttl_seconds: self.config.l1_ttl_seconds,
        };

        // Store in L1 cache
        self.l1_cache.insert(key.clone(), entry.clone()).await;
        
        // Also store in L2 for backup
        self.l2_cache.insert(key.clone(), entry);
        
        self.metrics.cache_size.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
        self.metrics.memory_usage_bytes.fetch_add(
            serialized_size as u64,
            std::sync::atomic::Ordering::Relaxed
        );
        self.update_type_metrics(CacheEntryType::NftInfo, true).await;
    }

    /// Get valuation from cache
    pub async fn get_valuation(&self, key: &CacheKey) -> Option<ValuationResult> {
        let start_time = Instant::now();
        self.metrics.total_requests.fetch_add(1, std::sync::atomic::Ordering::Relaxed);

        // Try L1 cache first
        if let Some(entry) = self.l1_cache.get(key).await {
            self.metrics.l1_hits.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
            self.update_access_stats(&entry).await;
            
            let access_time_us = start_time.elapsed().as_micros() as u64;
            self.metrics.avg_access_time_us.fetch_add(access_time_us, std::sync::atomic::Ordering::Relaxed);
            
            match &entry.data {
                CacheEntryData::ValuationResult(result) => return Some(result.clone()),
                _ => warn!("Cache entry type mismatch for key {:?}", key),
            }
        }

        // Try L2 cache
        if let Some(entry) = self.l2_cache.get(key) {
            self.metrics.l2_hits.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
            self.update_access_stats(&entry).await;
            
            // Promote to L1 cache
            self.l1_cache.insert(key.clone(), entry.clone()).await;
            
            let access_time_us = start_time.elapsed().as_micros() as u64;
            self.metrics.avg_access_time_us.fetch_add(access_time_us, std::sync::atomic::Ordering::Relaxed);
            
            match &entry.data {
                CacheEntryData::ValuationResult(result) => return Some(result.clone()),
                _ => warn!("Cache entry type mismatch for key {:?}", key),
            }
        }

        self.metrics.misses.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
        self.update_type_metrics(CacheEntryType::ValuationResult, false).await;
        
        None
    }

    /// Set valuation in cache
    pub async fn set_valuation(&self, key: &CacheKey, valuation: &ValuationResult) {
        let serialized_size = serde_json::to_vec(valuation).unwrap_or_default().len();
        
        let entry = CacheEntry {
            entry_type: CacheEntryType::ValuationResult,
            data: CacheEntryData::ValuationResult(valuation.clone()),
            created_at: chrono::Utc::now(),
            last_accessed: Arc::new(RwLock::new(chrono::Utc::now())),
            access_count: Arc::new(std::sync::atomic::AtomicU64::new(1)),
            size_bytes: serialized_size,
            compressed: false,
            priority_score: Arc::new(RwLock::new(1.0)),
            ttl_seconds: self.config.l1_ttl_seconds,
        };

        self.l1_cache.insert(key.clone(), entry.clone()).await;
        self.l2_cache.insert(key.clone(), entry);
        
        self.metrics.cache_size.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
        self.metrics.memory_usage_bytes.fetch_add(
            serialized_size as u64,
            std::sync::atomic::Ordering::Relaxed
        );
        self.update_type_metrics(CacheEntryType::ValuationResult, true).await;
    }

    /// Get security validation from cache
    pub async fn get_security_validation(&self, key: &CacheKey) -> Option<SecurityValidationResult> {
        let start_time = Instant::now();
        self.metrics.total_requests.fetch_add(1, std::sync::atomic::Ordering::Relaxed);

        // Try L1 cache first
        if let Some(entry) = self.l1_cache.get(key).await {
            self.metrics.l1_hits.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
            self.update_access_stats(&entry).await;
            
            let access_time_us = start_time.elapsed().as_micros() as u64;
            self.metrics.avg_access_time_us.fetch_add(access_time_us, std::sync::atomic::Ordering::Relaxed);
            
            match &entry.data {
                CacheEntryData::SecurityValidationResult(result) => return Some(result.clone()),
                _ => warn!("Cache entry type mismatch for key {:?}", key),
            }
        }

        // Try L2 cache
        if let Some(entry) = self.l2_cache.get(key) {
            self.metrics.l2_hits.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
            self.update_access_stats(&entry).await;
            
            // Promote to L1 cache
            self.l1_cache.insert(key.clone(), entry.clone()).await;
            
            let access_time_us = start_time.elapsed().as_micros() as u64;
            self.metrics.avg_access_time_us.fetch_add(access_time_us, std::sync::atomic::Ordering::Relaxed);
            
            match &entry.data {
                CacheEntryData::SecurityValidationResult(result) => return Some(result.clone()),
                _ => warn!("Cache entry type mismatch for key {:?}", key),
            }
        }

        self.metrics.misses.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
        self.update_type_metrics(CacheEntryType::SecurityValidationResult, false).await;
        
        None
    }

    /// Set security validation in cache
    pub async fn set_security_validation(&self, key: &CacheKey, validation: &SecurityValidationResult) {
        let serialized_size = serde_json::to_vec(validation).unwrap_or_default().len();
        
        let entry = CacheEntry {
            entry_type: CacheEntryType::SecurityValidationResult,
            data: CacheEntryData::SecurityValidationResult(validation.clone()),
            created_at: chrono::Utc::now(),
            last_accessed: Arc::new(RwLock::new(chrono::Utc::now())),
            access_count: Arc::new(std::sync::atomic::AtomicU64::new(1)),
            size_bytes: serialized_size,
            compressed: false,
            priority_score: Arc::new(RwLock::new(1.0)),
            ttl_seconds: self.config.l1_ttl_seconds,
        };

        self.l1_cache.insert(key.clone(), entry.clone()).await;
        self.l2_cache.insert(key.clone(), entry);
        
        self.metrics.cache_size.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
        self.metrics.memory_usage_bytes.fetch_add(
            serialized_size as u64,
            std::sync::atomic::Ordering::Relaxed
        );
        self.update_type_metrics(CacheEntryType::SecurityValidationResult, true).await;
    }

    /// Invalidate cache entry
    pub async fn invalidate(&self, key: &CacheKey) {
        self.l1_cache.remove(key).await;
        self.l2_cache.remove(key);
        self.metrics.cache_size.fetch_sub(1, std::sync::atomic::Ordering::Relaxed);
    }

    /// Clear all cache entries
    pub async fn clear(&self) {
        self.l1_cache.invalidate_all();
        self.l2_cache.clear();
        self.metrics.cache_size.store(0, std::sync::atomic::Ordering::Relaxed);
        self.metrics.memory_usage_bytes.store(0, std::sync::atomic::Ordering::Relaxed);
    }

    /// Get cache statistics
    pub async fn get_stats(&self) -> CacheStats {
        let total_requests = self.metrics.total_requests.load(std::sync::atomic::Ordering::Relaxed);
        let total_hits = self.metrics.l1_hits.load(std::sync::atomic::Ordering::Relaxed) + 
                         self.metrics.l2_hits.load(std::sync::atomic::Ordering::Relaxed);
        let hit_ratio = if total_requests > 0 {
            total_hits as f64 / total_requests as f64
        } else {
            0.0
        };

        CacheStats {
            total_requests,
            l1_hits: self.metrics.l1_hits.load(std::sync::atomic::Ordering::Relaxed),
            l2_hits: self.metrics.l2_hits.load(std::sync::atomic::Ordering::Relaxed),
            misses: self.metrics.misses.load(std::sync::atomic::Ordering::Relaxed),
            hit_ratio,
            cache_size: self.metrics.cache_size.load(std::sync::atomic::Ordering::Relaxed),
            memory_usage_mb: self.metrics.memory_usage_bytes.load(std::sync::atomic::Ordering::Relaxed) / 1024 / 1024,
            avg_access_time_us: self.metrics.avg_access_time_us.load(std::sync::atomic::Ordering::Relaxed),
            evictions: self.metrics.evictions.load(std::sync::atomic::Ordering::Relaxed),
            compressions: self.metrics.compressions.load(std::sync::atomic::Ordering::Relaxed),
            decompressions: self.metrics.decompressions.load(std::sync::atomic::Ordering::Relaxed),
        }
    }

    /// Update access statistics for an entry
    async fn update_access_stats(&self, entry: &CacheEntry) {
        let now = chrono::Utc::now();
        *entry.last_accessed.write().await = now;
        entry.access_count.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
        
        // Update priority score based on access patterns
        let _current_score = *entry.priority_score.read().await;
        let access_count = entry.access_count.load(std::sync::atomic::Ordering::Relaxed) as f64;
        let age_hours = (now - entry.created_at).num_hours() as f64;
        
        let new_score = (access_count / (age_hours + 1.0)).min(100.0);
        *entry.priority_score.write().await = new_score;
    }

    /// Update type-specific metrics
    async fn update_type_metrics(&self, entry_type: CacheEntryType, is_hit: bool) {
        if !self.config.enable_metrics {
            return;
        }

        let mut type_metrics = self.metrics.metrics_by_type
            .entry(entry_type)
            .or_insert_with(TypeMetrics::default);
        
        type_metrics.requests += 1;
        if is_hit {
            type_metrics.hits += 1;
        } else {
            type_metrics.misses += 1;
        }
    }

    /// Start eviction task
    fn start_eviction_task(&self) {
        // In a real implementation, this would spawn a background task
        // For now, we'll just note that this would be implemented
        info!("Eviction task started");
    }

    /// Start warming task
    fn start_warming_task(&self) {
        // In a real implementation, this would spawn a background task
        // For now, we'll just note that this would be implemented
        info!("Cache warming task started");
    }

    /// Get performance metrics
    pub fn get_metrics(&self) -> &CacheMetrics {
        &self.metrics
    }
}

/// Cache statistics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CacheStats {
    pub total_requests: u64,
    pub l1_hits: u64,
    pub l2_hits: u64,
    pub misses: u64,
    pub hit_ratio: f64,
    pub cache_size: u64,
    pub memory_usage_mb: u64,
    pub avg_access_time_us: u64,
    pub evictions: u64,
    pub compressions: u64,
    pub decompressions: u64,
}

impl CompressionEngine {
    pub fn new(enabled: bool, threshold_bytes: usize) -> Self {
        Self {
            enabled,
            threshold_bytes,
            algorithm: CompressionAlgorithm::Gzip,
        }
    }

    pub fn compress(&self, data: &[u8]) -> NftResult<Vec<u8>> {
        if !self.enabled || data.len() < self.threshold_bytes {
            return Ok(data.to_vec());
        }

        match self.algorithm {
            CompressionAlgorithm::Gzip => {
                use flate2::write::GzEncoder;
                use flate2::Compression;
                use std::io::Write;
                
                let mut encoder = GzEncoder::new(Vec::new(), Compression::default());
                encoder.write_all(data)
                    .map_err(|e| NftError::Serialization {
                        message: format!("Compression failed: {}", e),
                        format: Some("gzip".to_string()),
                        data_type: Some("bytes".to_string()),
                    })?;
                
                encoder.finish()
                    .map_err(|e| NftError::Serialization {
                        message: format!("Compression finish failed: {}", e),
                        format: Some("gzip".to_string()),
                        data_type: Some("bytes".to_string()),
                    })
            }
            CompressionAlgorithm::Lz4 => {
                // Placeholder for LZ4 compression
                Ok(data.to_vec())
            }
            CompressionAlgorithm::Zstd => {
                // Placeholder for Zstd compression
                Ok(data.to_vec())
            }
        }
    }

    pub fn decompress(&self, compressed_data: &[u8]) -> NftResult<Vec<u8>> {
        if !self.enabled {
            return Ok(compressed_data.to_vec());
        }

        match self.algorithm {
            CompressionAlgorithm::Gzip => {
                use flate2::read::GzDecoder;
                use std::io::Read;
                
                let mut decoder = GzDecoder::new(compressed_data);
                let mut decompressed = Vec::new();
                
                decoder.read_to_end(&mut decompressed)
                    .map_err(|e| NftError::Serialization {
                        message: format!("Decompression failed: {}", e),
                        format: Some("gzip".to_string()),
                        data_type: Some("bytes".to_string()),
                    })?;
                
                Ok(decompressed)
            }
            CompressionAlgorithm::Lz4 => {
                // Placeholder for LZ4 decompression
                Ok(compressed_data.to_vec())
            }
            CompressionAlgorithm::Zstd => {
                // Placeholder for Zstd decompression
                Ok(compressed_data.to_vec())
            }
        }
    }
}

impl EvictionManager {
    pub fn new(policy: EvictionPolicy) -> Self {
        Self {
            policy,
            stats: Arc::new(EvictionStats::default()),
        }
    }
}

impl CacheWarmer {
    pub fn new(config: CacheWarmingConfig) -> Self {
        Self {
            config,
            stats: Arc::new(WarmingStats::default()),
        }
    }
}

impl Default for CacheWarmingConfig {
    fn default() -> Self {
        Self {
            enabled: false,
            interval_seconds: 300, // 5 minutes
            max_items_per_interval: 100,
            strategies: vec![
                WarmingStrategy::PopularItems { threshold: 10 },
                WarmingStrategy::RecentlyAccessed { time_window_minutes: 60 },
            ],
        }
    }
}

impl CacheKey {
    /// Create cache key for NFT metadata
    pub fn metadata(mint_address: &str) -> Self {
        Self {
            key_type: CacheKeyType::NftMetadata,
            value: mint_address.to_string(),
            namespace: None,
            version: Some(1),
        }
    }

    /// Create cache key for NFT valuation
    pub fn valuation(mint_address: &str) -> Self {
        Self {
            key_type: CacheKeyType::NftValuation,
            value: mint_address.to_string(),
            namespace: None,
            version: Some(1),
        }
    }

    /// Create cache key for security validation
    pub fn security(mint_address: &str) -> Self {
        Self {
            key_type: CacheKeyType::SecurityValidation,
            value: mint_address.to_string(),
            namespace: None,
            version: Some(1),
        }
    }

    /// Create cache key for collection data
    pub fn collection(collection_id: &str) -> Self {
        Self {
            key_type: CacheKeyType::CollectionData,
            value: collection_id.to_string(),
            namespace: None,
            version: Some(1),
        }
    }

    /// Create cache key for market data
    pub fn market_data(collection_id: &str) -> Self {
        Self {
            key_type: CacheKeyType::MarketData,
            value: collection_id.to_string(),
            namespace: None,
            version: Some(1),
        }
    }

    /// Create cache key for image data
    pub fn image(image_uri: &str) -> Self {
        Self {
            key_type: CacheKeyType::ImageData,
            value: image_uri.to_string(),
            namespace: None,
            version: Some(1),
        }
    }

    /// Create custom cache key
    pub fn custom(type_name: &str, value: &str) -> Self {
        Self {
            key_type: CacheKeyType::Custom { type_name: type_name.to_string() },
            value: value.to_string(),
            namespace: None,
            version: Some(1),
        }
    }
}