solana-recover 1.1.3

use std::sync::Arc;
use std::time::{Duration, Instant};
use std::collections::HashMap;
use tokio::sync::RwLock;
use serde::{Deserialize, Serialize};
use tracing::{debug, info, warn, error};
use bytes::{Bytes, Buf, BufMut};
use prost::{Message};
use bincode;
use flate2::{Compress, Decompress, Compression, flush::CompressError, flush::DecompressError};

/// Protocol optimization engine for network efficiency
#[derive(Clone)]
pub struct ProtocolOptimizer {
    /// Compression engine
    compression_engine: Arc<CompressionEngine>,
    /// Binary protocol handler
    binary_protocol: Arc<BinaryProtocolHandler>,
    /// Request optimizer
    request_optimizer: Arc<RequestOptimizer>,
    /// Response optimizer
    response_optimizer: Arc<ResponseOptimizer>,
    /// Performance metrics
    metrics: Arc<RwLock<ProtocolMetrics>>,
    /// Configuration
    config: ProtocolConfig,
}

/// Protocol optimization configuration
#[derive(Debug, Clone)]
pub struct ProtocolConfig {
    /// Enable binary protocol
    pub enable_binary_protocol: bool,
    /// Enable compression
    pub enable_compression: bool,
    /// Compression level (1-9)
    pub compression_level: u32,
    /// Minimum size for compression (bytes)
    pub min_compression_size: usize,
    /// Enable request batching
    pub enable_request_batching: bool,
    /// Maximum batch size
    pub max_batch_size: usize,
    /// Enable response caching
    pub enable_response_caching: bool,
    /// Cache TTL
    pub cache_ttl: Duration,
    /// Enable protocol versioning
    pub enable_versioning: bool,
    /// Protocol version
    pub protocol_version: u32,
}

impl Default for ProtocolConfig {
    fn default() -> Self {
        Self {
            enable_binary_protocol: true,
            enable_compression: true,
            compression_level: 6,
            min_compression_size: 1024,
            enable_request_batching: true,
            max_batch_size: 100,
            enable_response_caching: true,
            cache_ttl: Duration::from_secs(300), // 5 minutes
            enable_versioning: true,
            protocol_version: 1,
        }
    }
}

/// Protocol performance metrics
#[derive(Debug, Default, Clone)]
pub struct ProtocolMetrics {
    /// Total requests processed
    pub total_requests: u64,
    /// Total responses processed
    pub total_responses: u64,
    /// Compression ratio
    pub compression_ratio: f64,
    /// Binary protocol usage rate
    pub binary_protocol_rate: f64,
    /// Request batching efficiency
    pub batching_efficiency: f64,
    /// Cache hit rate
    pub cache_hit_rate: f64,
    /// Average processing time (microseconds)
    pub avg_processing_time_us: f64,
    /// Bandwidth saved (bytes)
    pub bandwidth_saved_bytes: u64,
}

/// Optimized request wrapper
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct OptimizedRequest {
    /// Request ID
    pub request_id: String,
    /// Protocol version
    pub protocol_version: u32,
    /// Request type
    pub request_type: RequestType,
    /// Payload (compressed if enabled)
    pub payload: Vec<u8>,
    /// Metadata
    pub metadata: RequestMetadata,
    /// Compression info
    pub compression_info: Option<CompressionInfo>,
    /// Binary format flag
    pub is_binary: bool,
}

/// Request types
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum RequestType {
    /// Single wallet scan
    WalletScan,
    /// Batch wallet scan
    BatchScan,
    /// Account info
    AccountInfo,
    /// Transaction info
    TransactionInfo,
    /// Health check
    HealthCheck,
    /// Custom request
    Custom(String),
}

/// Request metadata
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RequestMetadata {
    /// Timestamp
    pub timestamp: u64,
    /// Priority
    pub priority: u8,
    /// Timeout
    pub timeout_ms: u32,
    /// Retry count
    pub retry_count: u32,
    /// Client version
    pub client_version: String,
    /// Request size (original)
    pub original_size: usize,
}

/// Compression information
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CompressionInfo {
    /// Compression algorithm
    pub algorithm: String,
    /// Original size
    pub original_size: usize,
    /// Compressed size
    pub compressed_size: usize,
    /// Compression time (microseconds)
    pub compression_time_us: u64,
}

/// Optimized response wrapper
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct OptimizedResponse {
    /// Request ID
    pub request_id: String,
    /// Protocol version
    pub protocol_version: u32,
    /// Response status
    pub status: ResponseStatus,
    /// Payload (compressed if enabled)
    pub payload: Vec<u8>,
    /// Metadata
    pub metadata: ResponseMetadata,
    /// Compression info
    pub compression_info: Option<CompressionInfo>,
    /// Binary format flag
    pub is_binary: bool,
}

/// Response status
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum ResponseStatus {
    Success,
    Error(String),
    Timeout,
    RateLimited,
}

/// Response metadata
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ResponseMetadata {
    /// Timestamp
    pub timestamp: u64,
    /// Processing time (microseconds)
    pub processing_time_us: u64,
    /// Response size (original)
    pub original_size: usize,
    /// Cache hit flag
    pub cache_hit: bool,
}

/// Compression engine
pub struct CompressionEngine {
    config: ProtocolConfig,
}

/// Binary protocol handler
pub struct BinaryProtocolHandler {
    config: ProtocolConfig,
}

/// Request optimizer
pub struct RequestOptimizer {
    config: ProtocolConfig,
    cache: Arc<RwLock<HashMap<String, CachedRequest>>>,
}

/// Response optimizer
pub struct ResponseOptimizer {
    config: ProtocolConfig,
    cache: Arc<RwLock<HashMap<String, CachedResponse>>>,
}

/// Cached request
#[derive(Debug, Clone)]
struct CachedRequest {
    optimized_request: OptimizedRequest,
    created_at: Instant,
    access_count: u64,
}

/// Cached response
#[derive(Debug, Clone)]
struct CachedResponse {
    optimized_response: OptimizedResponse,
    created_at: Instant,
    access_count: u64,
}

impl ProtocolOptimizer {
    /// Create new protocol optimizer
    pub fn new(config: ProtocolConfig) -> Result<Self, Box<dyn std::error::Error + Send + Sync>> {
        Ok(Self {
            compression_engine: Arc::new(CompressionEngine::new(config.clone())?),
            binary_protocol: Arc::new(BinaryProtocolHandler::new(config.clone())?),
            request_optimizer: Arc::new(RequestOptimizer::new(config.clone())?),
            response_optimizer: Arc::new(ResponseOptimizer::new(config.clone())?),
            metrics: Arc::new(RwLock::new(ProtocolMetrics::default())),
            config,
        })
    }

    /// Optimize outgoing request
    pub async fn optimize_request(&self, request_data: &[u8], request_type: RequestType) -> Result<OptimizedRequest, Box<dyn std::error::Error + Send + Sync>> {
        let start_time = Instant::now();
        
        let request_id = uuid::Uuid::new_v4().to_string();
        let original_size = request_data.len();

        // Check cache first
        if self.config.enable_response_caching {
            if let Some(cached) = self.request_optimizer.get_cached_request(&request_id).await {
                return Ok(cached.optimized_request);
            }
        }

        // Apply optimizations
        let mut optimized_payload = request_data.to_vec();
        let mut compression_info = None;
        let mut is_binary = false;

        // Binary protocol optimization
        if self.config.enable_binary_protocol {
            optimized_payload = self.binary_protocol.serialize_request(&optimized_payload, &request_type).await?;
            is_binary = true;
        }

        // Compression optimization
        if self.config.enable_compression && optimized_payload.len() >= self.config.min_compression_size {
            let compression_start = Instant::now();
            let compressed = self.compression_engine.compress(&optimized_payload).await?;
            let compression_time = compression_start.elapsed().as_micros() as u64;

            compression_info = Some(CompressionInfo {
                algorithm: "gzip".to_string(),
                original_size: optimized_payload.len(),
                compressed_size: compressed.len(),
                compression_time_us: compression_time,
            });

            optimized_payload = compressed;
        }

        let metadata = RequestMetadata {
            timestamp: std::time::SystemTime::now()
                .duration_since(std::time::UNIX_EPOCH)
                .unwrap()
                .as_secs(),
            priority: 1,
            timeout_ms: 30000,
            retry_count: 0,
            client_version: "2.0.0".to_string(),
            original_size,
        };

        let optimized_request = OptimizedRequest {
            request_id: request_id.clone(),
            protocol_version: self.config.protocol_version,
            request_type,
            payload: optimized_payload,
            metadata,
            compression_info,
            is_binary,
        };

        // Cache the optimized request
        if self.config.enable_response_caching {
            self.request_optimizer.cache_request(&request_id, optimized_request.clone()).await;
        }

        // Update metrics
        let processing_time = start_time.elapsed().as_micros() as u64;
        self.update_request_metrics(&optimized_request, processing_time).await;

        Ok(optimized_request)
    }

    /// Optimize incoming response
    pub async fn optimize_response(&self, response_data: &[u8], request_id: &str, status: ResponseStatus) -> Result<OptimizedResponse, Box<dyn std::error::Error + Send + Sync>> {
        let start_time = Instant::now();
        let original_size = response_data.len();

        // Check cache first
        if self.config.enable_response_caching {
            if let Some(cached) = self.response_optimizer.get_cached_response(request_id).await {
                return Ok(cached.optimized_response);
            }
        }

        // Apply optimizations
        let mut optimized_payload = response_data.to_vec();
        let mut compression_info = None;
        let mut is_binary = false;

        // Binary protocol optimization
        if self.config.enable_binary_protocol {
            optimized_payload = self.binary_protocol.serialize_response(&optimized_payload).await?;
            is_binary = true;
        }

        // Compression optimization
        if self.config.enable_compression && optimized_payload.len() >= self.config.min_compression_size {
            let compression_start = Instant::now();
            let compressed = self.compression_engine.compress(&optimized_payload).await?;
            let compression_time = compression_start.elapsed().as_micros() as u64;

            compression_info = Some(CompressionInfo {
                algorithm: "gzip".to_string(),
                original_size: optimized_payload.len(),
                compressed_size: compressed.len(),
                compression_time_us: compression_time,
            });

            optimized_payload = compressed;
        }

        let metadata = ResponseMetadata {
            timestamp: std::time::SystemTime::now()
                .duration_since(std::time::UNIX_EPOCH)
                .unwrap()
                .as_secs(),
            processing_time_us: start_time.elapsed().as_micros() as u64,
            original_size,
            cache_hit: false,
        };

        let optimized_response = OptimizedResponse {
            request_id: request_id.to_string(),
            protocol_version: self.config.protocol_version,
            status,
            payload: optimized_payload,
            metadata,
            compression_info,
            is_binary,
        };

        // Cache the optimized response
        if self.config.enable_response_caching {
            self.response_optimizer.cache_response(request_id, optimized_response.clone()).await;
        }

        // Update metrics
        let processing_time = start_time.elapsed().as_micros() as u64;
        self.update_response_metrics(&optimized_response, processing_time).await;

        Ok(optimized_response)
    }

    /// Deoptimize request (restore original format)
    pub async fn deoptimize_request(&self, optimized_request: &OptimizedRequest) -> Result<Vec<u8>, Box<dyn std::error::Error + Send + Sync>> {
        let mut payload = optimized_request.payload.clone();

        // Decompression if needed
        if let Some(compression_info) = &optimized_request.compression_info {
            payload = self.compression_engine.decompress(&payload).await?;
        }

        // Binary protocol deserialization if needed
        if optimized_request.is_binary {
            payload = self.binary_protocol.deserialize_request(&payload, &optimized_request.request_type).await?;
        }

        Ok(payload)
    }

    /// Deoptimize response (restore original format)
    pub async fn deoptimize_response(&self, optimized_response: &OptimizedResponse) -> Result<Vec<u8>, Box<dyn std::error::Error + Send + Sync>> {
        let mut payload = optimized_response.payload.clone();

        // Decompression if needed
        if let Some(compression_info) = &optimized_response.compression_info {
            payload = self.compression_engine.decompress(&payload).await?;
        }

        // Binary protocol deserialization if needed
        if optimized_response.is_binary {
            payload = self.binary_protocol.deserialize_response(&payload).await?;
        }

        Ok(payload)
    }

    /// Get current performance metrics
    pub async fn get_metrics(&self) -> ProtocolMetrics {
        self.metrics.read().await.clone()
    }

    /// Reset metrics
    pub async fn reset_metrics(&self) {
        let mut metrics = self.metrics.write().await;
        *metrics = ProtocolMetrics::default();
    }

    /// Update request metrics
    async fn update_request_metrics(&self, request: &OptimizedRequest, processing_time_us: u64) {
        let mut metrics = self.metrics.write().await;
        metrics.total_requests += 1;

        // Update binary protocol rate
        if request.is_binary {
            metrics.binary_protocol_rate = (metrics.binary_protocol_rate * (metrics.total_requests - 1) as f64 + 1.0) / metrics.total_requests as f64;
        }

        // Update compression ratio
        if let Some(compression_info) = &request.compression_info {
            let ratio = compression_info.compressed_size as f64 / compression_info.original_size as f64;
            metrics.compression_ratio = (metrics.compression_ratio * (metrics.total_requests - 1) as f64 + (1.0 - ratio)) / metrics.total_requests as f64;
            
            metrics.bandwidth_saved_bytes += (compression_info.original_size - compression_info.compressed_size) as u64;
        }

        // Update average processing time
        metrics.avg_processing_time_us = (metrics.avg_processing_time_us * (metrics.total_requests - 1) as f64 + processing_time_us as f64) / metrics.total_requests as f64;
    }

    /// Update response metrics
    async fn update_response_metrics(&self, response: &OptimizedResponse, processing_time_us: u64) {
        let mut metrics = self.metrics.write().await;
        metrics.total_responses += 1;

        // Update cache hit rate
        if response.metadata.cache_hit {
            metrics.cache_hit_rate = (metrics.cache_hit_rate * (metrics.total_responses - 1) as f64 + 1.0) / metrics.total_responses as f64;
        }
    }
}

impl CompressionEngine {
    fn new(config: ProtocolConfig) -> Result<Self, Box<dyn std::error::Error + Send + Sync>> {
        Ok(Self { config })
    }

    async fn compress(&self, data: &[u8]) -> Result<Vec<u8>, Box<dyn std::error::Error + Send + Sync>> {
        let mut encoder = flate2::write::GzEncoder::new(Vec::new(), Compression::new(self.config.compression_level));
        encoder.write_all(data)?;
        Ok(encoder.finish()?)
    }

    async fn decompress(&self, data: &[u8]) -> Result<Vec<u8>, Box<dyn std::error::Error + Send + Sync>> {
        let mut decoder = flate2::write::GzDecoder::new(Vec::new());
        decoder.write_all(data)?;
        Ok(decoder.finish()?)
    }
}

impl BinaryProtocolHandler {
    fn new(config: ProtocolConfig) -> Result<Self, Box<dyn std::error::Error + Send + Sync>> {
        Ok(Self { config })
    }

    async fn serialize_request(&self, data: &[u8], request_type: &RequestType) -> Result<Vec<u8>, Box<dyn std::error::Error + Send + Sync>> {
        // Simple binary serialization using bincode
        let request_wrapper = BinaryRequestWrapper {
            request_type: request_type.clone(),
            data: data.to_vec(),
        };
        bincode::serialize(&request_wrapper).map_err(|e| e.into())
    }

    async fn serialize_response(&self, data: &[u8]) -> Result<Vec<u8>, Box<dyn std::error::Error + Send + Sync>> {
        // Simple binary serialization
        bincode::serialize(data).map_err(|e| e.into())
    }

    async fn deserialize_request(&self, data: &[u8], request_type: &RequestType) -> Result<Vec<u8>, Box<dyn std::error::Error + Send + Sync>> {
        let wrapper: BinaryRequestWrapper = bincode::deserialize(data)?;
        Ok(wrapper.data)
    }

    async fn deserialize_response(&self, data: &[u8]) -> Result<Vec<u8>, Box<dyn std::error::Error + Send + Sync>> {
        bincode::deserialize(data).map_err(|e| e.into())
    }
}

impl RequestOptimizer {
    fn new(config: ProtocolConfig) -> Result<Self, Box<dyn std::error::Error + Send + Sync>> {
        Ok(Self {
            config,
            cache: Arc::new(RwLock::new(HashMap::new())),
        })
    }

    async fn get_cached_request(&self, request_id: &str) -> Option<CachedRequest> {
        let cache = self.cache.read().await;
        cache.get(request_id).cloned()
    }

    async fn cache_request(&self, request_id: &str, request: OptimizedRequest) {
        let mut cache = self.cache.write().await;
        cache.insert(request_id.to_string(), CachedRequest {
            optimized_request: request,
            created_at: Instant::now(),
            access_count: 0,
        });
    }
}

impl ResponseOptimizer {
    fn new(config: ProtocolConfig) -> Result<Self, Box<dyn std::error::Error + Send + Sync>> {
        Ok(Self {
            config,
            cache: Arc::new(RwLock::new(HashMap::new())),
        })
    }

    async fn get_cached_response(&self, request_id: &str) -> Option<CachedResponse> {
        let cache = self.cache.read().await;
        cache.get(request_id).cloned()
    }

    async fn cache_response(&self, request_id: &str, response: OptimizedResponse) {
        let mut cache = self.cache.write().await;
        cache.insert(request_id.to_string(), CachedResponse {
            optimized_response: response,
            created_at: Instant::now(),
            access_count: 0,
        });
    }
}

/// Binary request wrapper for serialization
#[derive(Debug, Clone, Serialize, Deserialize)]
struct BinaryRequestWrapper {
    request_type: RequestType,
    data: Vec<u8>,
}

#[cfg(test)]
mod tests {
    use super::*;

    #[tokio::test]
    async fn test_protocol_optimizer_creation() {
        let config = ProtocolConfig::default();
        let optimizer = ProtocolOptimizer::new(config);
        assert!(optimizer.is_ok());
    }

    #[tokio::test]
    async fn test_request_optimization() {
        let config = ProtocolConfig::default();
        let optimizer = ProtocolOptimizer::new(config).unwrap();

        let request_data = b"test request data";
        let request_type = RequestType::WalletScan;

        let optimized = optimizer.optimize_request(request_data, request_type).await;
        assert!(optimized.is_ok());

        let optimized_request = optimized.unwrap();
        assert_eq!(optimized_request.request_type, RequestType::WalletScan);
        assert!(optimized_request.metadata.original_size > 0);
    }

    #[tokio::test]
    async fn test_response_optimization() {
        let config = ProtocolConfig::default();
        let optimizer = ProtocolOptimizer::new(config).unwrap();

        let response_data = b"test response data";
        let request_id = "test_request_id";
        let status = ResponseStatus::Success;

        let optimized = optimizer.optimize_response(response_data, request_id, status).await;
        assert!(optimized.is_ok());

        let optimized_response = optimized.unwrap();
        assert_eq!(optimized_response.request_id, request_id);
        assert!(matches!(optimized_response.status, ResponseStatus::Success));
    }

    #[tokio::test]
    async fn test_compression() {
        let config = ProtocolConfig::default();
        let compression_engine = CompressionEngine::new(config).unwrap();

        let data = vec![0u8; 10000]; // Large data for compression
        let compressed = compression_engine.compress(&data).await.unwrap();
        let decompressed = compression_engine.decompress(&compressed).await.unwrap();

        assert_eq!(data, decompressed);
        assert!(compressed.len() < data.len()); // Should be compressed
    }

    #[tokio::test]
    async fn test_binary_protocol() {
        let config = ProtocolConfig::default();
        let binary_handler = BinaryProtocolHandler::new(config).unwrap();

        let data = b"test binary data";
        let request_type = RequestType::AccountInfo;

        let serialized = binary_handler.serialize_request(data, &request_type).await.unwrap();
        let deserialized = binary_handler.deserialize_request(&serialized, &request_type).await.unwrap();

        assert_eq!(data.to_vec(), deserialized);
    }

    #[tokio::test]
    async fn test_metrics_tracking() {
        let config = ProtocolConfig::default();
        let optimizer = ProtocolOptimizer::new(config).unwrap();

        let initial_metrics = optimizer.get_metrics().await;
        assert_eq!(initial_metrics.total_requests, 0);
        assert_eq!(initial_metrics.total_responses, 0);

        // Perform optimization
        let request_data = b"test data";
        let _optimized = optimizer.optimize_request(request_data, RequestType::WalletScan).await.unwrap();

        let metrics = optimizer.get_metrics().await;
        assert_eq!(metrics.total_requests, 1);
        assert!(metrics.avg_processing_time_us > 0.0);
    }
}